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1.
《Scandinavian Journal of Forest Research》2012,27(1-4):289-304
Soil water characteristics were determined in 6 soil profiles along a Norway spruce forested sandy‐loamy till hillslope in Southern and Northern Sweden, respectively. The soil moisture class was mesic at both sites, i.e. having well drained soil water conditions. Two different Podzols; Leptic and Orthic, were developed at each site respectively. The vertical distribution of soil water retention capacity (SWRC) was similar in the different profiles at each site respectively. The SWRC of the mineral soil was significantly higher in the spodic B horizon compared to the other horizons. In concordance with the vertical distribution of SWRC, the largest amount of organic matter in the mineral soil, measured as ignition loss, was also found in the spodic B horizon. The significantly higher SWRC in the spodic B horizon, i.e. the ¡lluvial horizon, was suggested to depend on the accumulated organic‐sesquioxide material in this horizon. As SWRC reached maximum values in the spodic B horizon at all tensions applied, it was further suggested that soil formation in the studied profiles enhanced the formation of both micro‐ and macropores in the spodic B horizon. The variation of SWRC, at a certain level in the soil, was often larger within a profile than between the profiles at each site respectively. 相似文献
2.
大兴安岭北部西坡寒棕壤标准剖面的研究 总被引：2，自引：0，他引：2
在对大兴安岭北部林区寒棕壤进行多次面上调查及定位研究的基础上，根据初步拟定的“寒棕壤系统分类”，选择了具有广泛代表性的大兴安岭北部西坡潮查自然保护区作为寒棕壤标准剖面采集地点，并按“中国土壤系统分类研究项目”拟定的土壤剖面描述标准和土壤实验室分析项目及方法规范进行外业采集土壤标本和内业土壤分析。研究结果讨论了寒棕壤标准剖面的成土条件和基本性质；并以诊断层和诊断特性为基础研究检查了寒棕壤系统分类中的问题，对诊断层中的诊断表层（腐殖质表层、潜育特征），诊断表下层（风化Ｂ层、粘化层、灰化淀积层、灰化淀积特征）和诊断特性中的冻融特征、土壤水分状况、土壤温度状况、地表至５０ｃｍ土层的石砾含量等进行了检查讨论。 相似文献
3.
B. Vanlauwe F. K. Akinnifesi B. K. Tossah O. Lyasse N. Sanginga R. Merckx 《Agroforestry Systems》2002,54(1):1-12
Although crucial for assessing the functioning of alley cropping systems, quantitative information related to the hedgerow
tree root distribution remains scarce. Soil mapping and destructive soil sampling was used to assess the impact of soil profile
features on selected root characteristics of Senna siamea hedgerows, growing in alley cropping systems in three sites (Glidji, Amoutchou, and Sarakawa) representative for the derived
savanna of Togo, West Africa. While the soil profiles in Glidji and Sarakawa contained a clay accumulation horizon, the Amoutchou
profile was sandy up to 1 m. The number of small roots (diameter < 2 mm), quantified on a soil profile wall, decreased with
depth in all sites. For most soil depths, the abundance of small roots tended to be higher near the tree base, e.g., ranging
from 5.3 dm−2 in Amoutchou to 21.4 dm−2 in Glidji for the 0–20 cm layer, than in the middle of the alley, e.g., ranging from 3.1 dm−2 in Amoutchou to 13.8 dm−2 in Glidji for the 0–20 cm layer. Root length density (RLD) of the 0–10 cm and 10–20 cm layers was significantly higher in
Glidji than in Amoutchou (P < 0.05) and in Sarakawa (P = 0.08). Differences in RLD between sites were not significant for layers below 30 cm. For each layer, root weight densities
(RWD) were similar in all sites, e.g., ranging from 0.44 mg cm−3 in Amoutchou to 0.64 mg cm−3 in Glidji in the 0–10 cm layer, indicating that the roots in the Glidji topsoil had a smaller overall diameter than in Amoutchou.
In Amoutchou, the relative RLD was lower than in Glidji or Sarakawa for the top 40 cm of soil, while the inverse was observed
for the layers between 50 and 100 cm deep and this was related to the sandy soil profile in Amoutchou. Another consequence
of the sandy profile was the larger tap root diameter below 50 cm in Amoutchou compared to Sarakawa. For all sites, significant
(P < 0.001) linear regressions were observedbetween RLD's, RWD's, and the abundance of small roots, although the variation explained
by the regression equations was highest for the relationship between RLD and RWD. The potential of the hedgerows to recover
nutrients leached beyond the reach of food crops or the safety-net efficiency was evaluated for the tree sites.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
4.
Effects of subsoil compaction and simulated root channels (perforations) through the compacted layer on root growth, water uptake, foliar nutrient concentration and growth of radiata pine (Pinus radiata D. Don) were studied in a field experiment where a range of treatments were applied in reconstituted soil profiles. Subsoil compaction adversely affected root penetration in deeper parts of the soil and consequently caused greater water stress in trees. However, the effect of compaction was largely overcome when the subsoil was perforated to render 0.2% of the soil volume into vertical channels. Roots showed a remarkable ability to reach the points of low penetration strength and to travel through them to deeper parts of the profile. Perforations through compacted soil layers at a relatively low frequency may be a practical solution to allow root development into deeper parts of the soil and allow greater soil water exploration by roots. 相似文献
5.
This investigation of three Abies alba stands differing in stem density (338–715 per ha) and vertical structure (one-storeyed or multi-layered) explored the relations
between distance from neighbouring tree stems and local canopy openness and selected topsoil properties. The null hypothesis
was that in relatively densely stocked forests of close–random stem distribution topsoil morphology, pH and moisture do not
differ in inter-crown and under-crown patches. In three plots 1.1 ha in area, soil samples were taken in a square grid 5.0 × 5.0 m
and analysed using semivariogram estimation and spatial autocorrelation. The local configuration of trees around the sampled
locations was characterised using hemispheral photography and a local stand density index based on tree locations and diameters.
The largest portion of the total variation in the soil variables analysed (68–100%) was attributable to small-scale variation
in scales <5 m. In all stands, irrespective of density and vertical structure, local stand density/canopy openness correlated
positively/negatively with ectohumus layer thickness but negatively/positively with upper soil pH and moisture. Variation
in the local configuration of trees explained up to 17% of the total variation in organic horizon thickness, up to 22–29%
in topsoil pH (depending on the horizon) and up to 19–27% in topsoil moisture. The results indicate that even in stands of
random tree patterning, stem neighbourhood and small-scale variation in canopy density may contribute significantly to topsoil
heterogeneity and potentially affect the functioning and structure of forest floor vegetation. 相似文献
6.
[目的]为探究滴灌条件下杨树人工林细根的空间分布特征,对大兴区林场滴灌栽培的5年生欧美107杨的细根分布进行研究。[方法]采用根钻法分别在株间、对角和行间方向距树干0.2、0.5、1.0、1.5 m处取样,取样深度为60 cm,每10 cm为1个土层。[结果]滴灌条件下,在不同方向的不同树干距离和土层深度,杨树人工林的细根生物量和根长表现出相似的分布特征,其分布受树干距离、土层及其交互作用的影响显著(P0.05)。滴灌条件下,株间方向的细根总长为12.7 cm,分别是对角和行间方向细根长的1.82倍和2.32倍,上述3个方向取样位点细根总长为25.2 cm,其中的86.4%在滴灌形成的湿润带范围内;0 40 cm土层的细根长占0 60 cm土层细根总长的84.5%。各方向的细根水平分布特征不同,株间方向细根长在距树干0.5 m处最大,为4.2 cm,占该方向细根总长的33.1%,且与其他树干距离处差异显著(P0.05);对角和行间方向细根长在距树干0.2 m处最大,分别为2.7、2.3 cm,占各自方向细根总长的38.1%和41.8%。各方向的细根垂直分布特征不同,株间方向细根长在0 10 cm土层最大,为3.7 cm,占该方向细根总长的29.1%,且与其他土层差异显著(P0.05);对角和行间方向细根长均在10 20 cm土层最大,分别为2.0、1.7 cm,占各自方向细根总长的27.9%和31.0%,与其他土层细根长差异显著(P0.05)。[结论]滴灌条件下,杨树人工林细根的空间分布特征可以采用细根生物量或细根长任一指标来表述。滴灌后形成的连续湿润带导致土壤水分条件的差异使细根在不同方向的水平分布和垂直分布特征不同,细根分布表现为株间对角行间,细根主要分布在湿润带范围内且在0 40 cm土层相对集中分布。依据滴灌栽培杨树人工林细根的水平和垂直分布规律,每次滴灌后应保证水分侧渗到距离树干至少50 cm的范围,下渗的深度至少达到40 cm深,以满足杨树人工林正常生长对水分的需求。本研究结果和结论为确定精准的单次有效灌溉量提供理论依据,从而实现既节水又确保林木正常生长的双重目标。 相似文献
7.
Spatial statistical analyses were performed to describe root distribution and changes in soil strength in a mature clonal plantation of Eucalyptus spp. in the Congo. The objective was to analyze spatial variability in root distribution. Relationships between root distribution, soil strength and the water and nutrient uptake by the stand were also investigated. We studied three, 2.35-m-wide, vertical soil profiles perpendicular to the planting row and at various distances from a representative tree. The soil profiles were divided into 25-cm2 grid cells and the number of roots in each of three diameter classes counted in each grid cell. Two profiles were 2-m deep and the third profile was 5-m deep. There was both vertical and horizontal anisotropy in the distribution of fine roots in the three profiles, with root density decreasing sharply with depth and increasing with distance from the stump. Roots were present in areas with high soil strength values (> 6,000 kPa). There was a close relationship between soil water content and soil strength in this sandy soil. Soil strength increased during the dry season mainly because of water uptake by fine roots. There were large areas with low root density, even in the topsoil. Below a depth of 3 m, fine roots were spatially concentrated and most of the soil volume was not explored by roots. This suggests the presence of drainage channels, resulting from the severe hydrophobicity of the upper soil. 相似文献
8.
Spatial distribution characteristics of fine roots of Populus euphratica in a desert riparian forest
The soil-plant system is a very important subsystem of the soil-plant-atmosphere continuum (SPAC). The water uptake by plant
roots is an important subject in the research on water transport in this SPAC and is also the most active study direction
in the fields of ecology, hydrology and environment. The study of the spatial distribution pattern of fine roots of plants
is the basis of constructing a water absorption model of plant roots. Our study on the spatial distribution pattern of fine
roots of Populus euphratica in a desert riparian forest shows that the density distribution of its root lengths can be expressed horizontally as a parabola.
The fine roots are concentrated within the range of 0–350 cm from the tree trunk and their amount accounts for 91.9% of the
total root mass within the space of 0–500 cm. In the vertical direction, the density distribution of the fine root lengths
shows a negative exponential relation with soil depth. The fine roots are concentrated in the 0–80 cm soil layer, accounting
for 96.8% of the total root mass in the 0–140 cm soil layer.
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Translated from Chinese Journal of Ecology, 2007, 26(1): 1–4 [译自: 生态学杂志] 相似文献
9.
Pavel Šamonil Martin Valtera Stanislav Bek Barbora Šebková Tomáš Vrška Jakub Houška 《European Journal of Forest Research》2011,130(6):1075-1091
Soil variability was assessed in a 74.2-ha area within the Žofínsky prales natural forest. Parameters evaluated for 1765 soil
profiles inside 353 graticule plots were as follows: (1) thickness of organic horizons, (2) thickness and form of mineral
horizons, (3) humus form (HF), (4) soil taxonomic unit (STU) and (5) anomalies. In addition, soil reaction (pHKCl) and oxidizable carbon content (Cox) were measured in the laboratory for 734 samples from the upper mineral (A) and lower mineral (B) horizons. The most frequently
occurring humus form was mor followed by moder, hydromor and peaty T-horizon. Entic Podzols, Dystric Cambisols, Haplic Cambisols,
Albic Podzols, Histic (or Haplic) Gleysols, Endogleyic Stagnosols, Fibric or Hemic or Sapric Histosols and Stagnic Gleysols
were all present at the site despite its homogeneous geological bedrock. Overall coefficient of variance (CV) was lower in
terrestrial soils compared with (semi-)hydromorphic soils. Overall variance decreased in both soil groups with increasing
depth, as did CV differences between the fine (up to 10 m) and the locality scales. The lowest CV values occurred for Cox and pHKCl. The CV values differed between STUs as well. Compared to lower horizons, variograms of upper horizons showed greater autocorrelation
at the intermediate spatial scale (10–320 m)—ranging from 50 to 150 m. Semivariance values, however, reached 70–80% of sill
already at a distance of 10 m. The most significant factor of variability at all studied spatial scales is presumably the
soil disturbance regime, followed by terrain micro-topography and the effect of tree species. 相似文献
10.
11.
Alexandre Badoux Michel Jeisy Hans Kienholz Peter Lüscher Rolf Weingartner Jonas Witzig Christoph Hegg 《European Journal of Forest Research》2006,125(1):27-41
The project “Lothar and Mountain Torrents” investigates the effect of storm-originated deforestation on the hydrology on three
scales within the Sperbelgraben catchment (Swiss Prealps). This article focuses on runoff measurements during a 3-year period
in two differently affected sub-catchments (≈2 ha) and on 2-year surface runoff measurements on smaller plots (50–110 m2). The link between these two scales and the results of irrigation experiments on 1 m2 areas are interpreted using a detailed map of forest site types describing soil and vegetation characteristics. Plot results
show that surface runoff is generated in two distinct ways. On the one hand, high amounts of saturation overland flow were
observed on wet areas of gleyic soils. On the other hand, hardly any surface runoff was measured on Cambisols, with the exception
of a short hydrophobic reaction at the beginning of storms occurring on areas with a thick organic litter layer (temporary
Hortonian overland flow). On the long term, the lightly damaged sub-catchment (SC1) yields less runoff than the highly damaged
one (SC2). This is confirmed when direct runoff volumes during flood events are considered. However, short and intensive showers
surprisingly lead to higher discharge peaks in SC1. This occurrence is explained by different geomorphologic characteristics
(mainly the channel density) and the spatial distribution of the moist to wet forest site types. Effects of deforestation
and local soil compaction due to forest clearing remain small on both plot and sub-catchment scale. 相似文献
12.
The distribution of fine (<2 mm diameter) and small roots (2–20 mm diameter) was investigated in a chronosequence consisting
of 9-year-old, 26-year-old, 82-year-old and 146-year-old European beech (Fagus sylvatica) stands. A combination of trench wall observations and destructive root sampling was used to establish whether root distribution
and total biomass of fine and small roots varied with stand age. Root density decreased with soil depth in all stands, and
variability appeared to be highest in subsoil horizons, especially where compacted soil layers occurred. Roots clustered in
patches in the top 0–50 cm of the soil or were present as root channels at greater depths. Cluster number, cluster size and
number of root channels were comparable in all stands, and high values of soil exploitation occurred throughout the entire
chronosequence. Overall fine root biomass at depths of 0–120 cm ranged from 7.4 Mg ha−1 to 9.8 Mg ha−1, being highest in the two youngest stands. Small root biomass ranged from 3.6 Mg ha−1 to 13.3 Mg ha−1. Use of trench wall observations combined with destructive root samples reduced the variability of these estimates. These
records showed that variability in fine root distribution depended more on soil depth and edaphic conditions than on stand
age, and suggest that trench wall studies provide a useful tool to improve estimates of fine root biomass. 相似文献
13.
Microenvironmental heterogeneity of soil physical properties in 0–20 cm and 20–40 cm soil layers in a broad-leaved Pinus koraiensis forest gap in Xiao Xing’anling Mountains were analyzed by geostatistical method. The results show that the amount of soil
water, saturation water capacity, capillary water capacity and porosity in the top layer were greater than those in the lower
layer, except for bulk density, where the opposite applied. Soil physical properties in the top soil layer had relatively
higher ranges and coefficients of variation. The total and auto correlation spatial heterogeneity of soil physical properties
in the top layer were larger than those in the lower layer. The soil water had a strong anisotropic structure in an easterly
and northerly direction, but porosity shows isotropy in the same directions. With increasing spatial distance, the other three
physical factors exhibited anisotropic structures. The mutual effect between semi-variograms of soil physical properties in
the top layer within the spatial autocorrelation range was not significant. For spatial distribution of physical properties
within different layers, the patches at the middle and lower ranks in the forest gap dominated. Patches at higher rank were
only distributed in the 0–20 cm soil layer and were located north of the forest gap center.
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Translated from Science of Soil and Water Conservation, 2007, 5(3): 52–58 [译自: 中国水土保持科学] 相似文献
14.
The main island of Okinawa, in southwestern Japan, is characterized by a subtropical climate, coral reefs, and reddish soils, which contain Acrisols and Cambisols (FAO/UNESCO classifications). Recently, due to soil erosion on hilly lands, the coral reefs have been damaged by an inflow of reddish soil. Forest clearing is thought to one of the factors increasing rain splash erosion rates on hilly lands, because it is believed that clearing disturbs the forest floor and causes the supply of litter to stop. After clearing, A0, A and B horizons will be denuded, one after the other, by rain splash. In this study, we measured rain splash erosion rates of undisturbed samples of A0, A and B horizons using an artificial rainfall apparatus. The results of experiments on rain splash erosion clarified several aspects of the erosion process in a clearing site. First, it was found that the rain splash erosion rates were higher in fresh litter than in decomposed litter, in decomposed litter than in the A horizon, and in the A horizon than in the B horizon. Thus, the erosion rate increases with soil depth. Secondly, surface-gleyed red and yellow soils are mostly vulnerable to rain splash erosion. The erosion rates of these soils are two to three times higher than those of the red soil and the yellow soils. Thirdly, the erosion rates are affected mainly by bulk density and saturated hydraulic conductivity, not by clay ratio and dispersion ratio. Lastly, the difference between erosion rates of surface-gleyed red and yellow soils and other soils will be even greater if a soil crust has formed, because the formation of a soil crust increases the rain splash erosion rate. 相似文献
15.
The soil structure was expressed with fractal dimensions of particle size distribution (PSD), aggregate size distribution
(ASD), and soil pore size distribution (SPD). The effect of soil fractal features on soil infiltration velocity and process
was studied. The result of the fractal feature shows that fractal dimensions of PSD are obviously greater than those of ASD
and SPD, and in different soil genetic horizons, the fractal dimension of ASD has the greatest variability, and shows a downtrend
on the top-to-bottom genetic horizon. According to the soil infiltration process curve, the infiltration process was divided
into three phases: (1) the initial phase (0–5 min), (2) the transition phase (5–30 min), and (3) the stable phase (30–180
min). In the initial phase of infiltration, the soil structure of soil genetic horizon A was the major influencing factor;
in the transition phase of infiltration, the pore distribution of soil horizon AB and soil structure of horizon B were the
major influencing factors; in the stable phase of infiltration, the soil structure of horizon C was the major influencing
factor to the infiltration velocity. Soil infiltration process is influenced comprehensively by soil PSD, ASD, and SPD. In
the overall soil water infiltration, the infiltration in shrub forest land was much faster than that in other land uses, and
in the initial infiltration phase, arable land soil infiltration was much faster than that in forest land, and in the stable
infiltration phase, the infiltration velocity in forest land was faster than that in arable land.
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Translated from Journal of Beijing Forestry University, 2006, 28(3): 73–78 [译自: 北京林业大学学报] 相似文献
16.
Root biomass and root distribution were studied in Entisols derived from the thick deposition of volcanic pumice on Hokkaido
Island, Japan, to examine the effect of soil conditions on tree root development. The soil had a thin (<10 cm) A horizon and
thick coarse pumiceous gravel layers with low levels of available nutrients and water. Two stands were studied: a Picea glehnii–Abies sachalinensis stand (PA stand) and a Larix kaempferi–Betula platyphylla var. japonica stand (LB stand). The allometric relationships between diameter at breast height (DBH) and aboveground and belowground biomass
of these species were obtained to estimate stand biomass. The belowground biomass was small: 30.6 Mg ha−1 for the PA stand and 24.3 Mg ha−1 for the LB stand. The trunk/root ratios of study stands were 4.8 for the PA stand and 4.3 for the LB stand, which were higher
than those from previous studies in boreal and temperate forests. All species developed shallow root systems, and fine roots
were spread densely in the shallow A horizon, suggesting that physical obstruction by the pumiceous layers and their low levels
of available water and nutrients restricted downward root elongation. The high trunk/root ratios of the trees may also have
resulted from the limited available rooting space in the study sites. 相似文献
17.
The study was carried out to investigate the possibility of improving degraded soil conditions of Andigama series by intercropping
coconut (Cocos nucifera L.) with Calliandra calothyrsus, Leucaena leucocephala, Acacia auriculiformis and Gliricidia sepium.
Bulk density was significantly low in NFT interplanted plots followed by improved aeration in AB and B horizons of the soil
profile. Total and readily available water fraction was higher in AB and B horizons of calliandra, acacia and gliricidia interplanted
plots over control plots due to the increase of organic matter content and root growth. Root growth and proliferation of calliandra
in A horizon were predominantly higher than that of leucaena, acacia and gliricidia species. In contrast, gliricidia roots
penetrated into B horizon more densely than roots of other species. Better root growth of coconut in A horizon was observed
in acacia and calliandra plots than other plots. The total coconut root biomass in AB and B horizons was higher in gliricidia
and acacia plots than other species, which accounted for 91% and 0.3% in AB horizon and 21% and 23% in B horizon for gliricidia
and acacia, respectively compared to the control. Total root biomass of coconut in calliandra plots was reduced by 5%, and
45% in AB and B horizons respectively. Results indicated that soil physical conditions of Andigama series (gravelly soil)
could be significantly improved by interplanting acacia and gliricidia, as indicated by enhanced coconut root growth and proliferation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
18.
采用空间代替时间的方法,研究了茂兰喀斯特森林自然恢复中土壤团聚体有机碳含量与团聚体分形特征。结果表明:同一恢复阶段的同一土层中1 2 mm、0.5 1 mm团聚体质量百分比(4.74%52.37%)与其质量百分比有机碳贡献率(2.87%59.98%)均高于0.25 0.5 mm、<0.25 mm团聚体;相同土层中的相同粒级团聚体土壤有机碳含量(0 10 cm土层23.47 55.82 g·kg-1,>20 cm土层14.36 36.80 g·kg-1)与其质量百分比有机碳含量(0 10 cm土层1.34 22.12 g·kg-1,>20 cm土层0.57 11.93 g·kg-1)均随植被自然恢复呈增加趋势;同一恢复阶段的相同粒级团聚体土壤有机碳含量(0 10 cm土层23.47 55.82 g·kg-1,>20 cm土层14.36 36.80 g·kg-1)与其质量百分比有机碳含量(0 10 cm土层1.34 22.12 g·kg-1,>20 cm土层0.5711.93 g·kg-1)随土层加深呈减少趋势;同一恢复阶段的同一土层团聚体中1 2 mm团聚体中有机碳含量(16.9053.43 g·kg-1)最低但其质量百分比有机碳含量(5.24 22.12 g·kg-1)最高;随植被自然恢复土壤团聚体分形维数在0 10 cm土层(2.01 2.16)呈增加趋势、在>20 cm土层(2.04 2.24)呈减小趋势;喀斯特森林植被自然恢复中土壤结构演化的核心可能是上层土壤细化和下层土壤粗化;喀斯特森林植被自然恢复中土壤结构有所改善;土壤团聚体分形维数可以作为喀斯特植被自然恢复中土壤有机碳质量评价的指标;加强保护喀斯特森林使其自然恢复,既有利于土壤结构的改善与减少侵蚀,也有利于土壤有机碳循环和累积。 相似文献
19.
[目的]探明广西不同栽培区江南油杉细根生物量的空间分布共性及其对土壤水分的响应机制.[方法]以广西3个栽培区江南油杉人工幼林为研究对象,采用根系全株分层挖掘和根系形态结构分析法,定量分析江南油杉幼树不同径级细根生物量密度、根长密度和表面积密度的空间分布特征.[结果]1)江南油杉幼林期细根生物量在垂直方向上主要分布在0～... 相似文献
20.
Jiayao Zhuang Jinchi Zhang Bo Zhang Hongyan Luo Xiaying Huang Jun Fu 《Frontiers of Forestry in China》2009,4(3):323-329
The distribution of root biomass was studied in different soil layers (0–10, 10–20, 20–30, 30–40 cm) by means of a “study
plot” method for various plant species in the Shangshe Catchment area in the Dabie Mountains, Anhui Province. The number and
lengths of root samples were recorded. In each study plot, anti-scourability of soils in corresponding soil layers was measured
with a C.C. Suoboliefu anti-scourability instrument. The results showed the following: 1) The root system was largely distributed
in the 0–40 cm soil layer and the number of roots was the largest in the surface soil layer. Fine roots<1 mm in diameter predominated
in root length. 2) In the same section, the anti-scourability indices of the surface soil layer were larger than those of
other soil layers in the various plant species. The tree root system, especially the fine roots<1 mm in diameter, are highly
instrumental in controlling soil losses. Correlation coefficients of length, number and density of fine roots and the anti-scourability
index were 0.8173, 0.7159 and 0.6434, respectively. The length of fine root is a key factor in the anti-scourability soil
index. This index is closely correlated with the non-capillarity of each soil type, indicating that forests have a strong
soil stabilizing function, because their root systems improve physical soil properties and ultimately are responsible for
the establishment of a biosoil system with an anti-scourability index.
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Translated from Science of Water and Soil Conservation, 2007, 5(6): 15–20 [译自: 中国水土保持科学] 相似文献