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1.
坡地开垦的径流泥沙响应   总被引：2，自引：0，他引：2  
Land use and land cover change is a key driver of environmental change. To investigate the runoff and erosion responses to frequent land use change on the steep lands in the Three Gorges area, China, a rainfall simulation experiment was conducted in plots randomly selected at a Sloping Land Conversion Program site with three soil surface conditions: existing vegetation cover, vegetation removal, and freshly hoed. Simulated rainfall was applied at intensities of 60 (low), 90 (medium), and 120 mm h 1 (high) in each plot. The results indicated that vegetation removal and hoeing significantly changed runoff generation. The proportion of subsurface runoff in the total runoff decreased from 30.3% to 6.2% after vegetation removal. In the hoed plots, the subsurface runoff comprised 29.1% of the total runoff under low-intensity rainfall simulation and the proportion rapidly decreased with increasing rainfall intensity. Vegetation removal and tillage also significantly increased soil erosion. The average soil erosion rates from the vegetation removal and hoed plots were 3.0 and 10.2 times larger than that in the existing vegetation cover plots, respectively. These identified that both the runoff generation mechanism and soil erosion changed as a consequence of altering land use on steep lands. Thus, conservation practices with maximum vegetation cover and minimum tillage should be used to reduce surface runoff and soil erosion on steep lands.  相似文献   

2.
草被地上和地下部分拦蓄径流和减少泥沙的效益分析   总被引：13，自引：0，他引：13  
研究草被地上和地下部分拦蓄径流和减少泥沙效益对科学评价草被防止土壤侵蚀的作用有重要科学意义。采用模拟降雨试验，分析了草被地上和地下部分拦蓄径流和减少泥沙的效益。结果表明，草被与森林植被一样，能有效防止土壤侵蚀。当草地地面覆盖达90％时，草被拦蓄径流效益达90％以上，而基本上无侵蚀发生。草被地上部分（茎枝＋枯落物）拦蓄径流效益为23．7％，其中茎枝部分拦蓄径流效益为9．0％和枯落物层拦蓄径流效益为14．7％，减少泥沙效益为44．6％；草被地下部分土壤体拦蓄径流效益为72．7％，拦蓄泥沙效益为55．4％。  相似文献   

3.
Soil erosion such as sheet erosion is frequently encountered in subalpine grassland in the Urseren Valley (Swiss Central Alps). Erosion damages have increased enormously in this region during the last 50 y, most likely due to changes in land‐use practices and due to the impact of climatic changes. In order to estimate the effect of vegetation characteristics on surface runoff and sediment loss, we irrigated 22 pasture plots of 1 m2 during 1 h at an intense rain rate of 50 mm h–1 in two field campaigns using a portable rain simulator. The rain‐simulation plots differed in plant composition (herb versus grass dominance) and land‐use intensity but not in plant cover (>90%) nor in soil conditions. Prior to the second rain‐simulation campaign, aboveground vegetation was clipped in order to simulate intense grazing. The generated surface runoffs, sediment loss, relative water retention in the aboveground vegetation, and changes in soil moisture were quantified. Runoff coefficient varied between 0.1% and 25%, and sediment loss ranged between 0 and 0.053 g m–2. Thus, high infiltration rates and full vegetation cover resulted in very low erosion rates even under such extreme rain events. Surface runoff did not differ significantly between herb‐ and grass‐dominated plots. However, clipping had a notable effect on surface runoff in the test plots under different land‐use intensity. In plots without or with intensive use, surface runoff decreased after clipping whereas in extensively used plots, surface runoff increased after the clipping. This opposite effect was mainly explained by higher necromass and litter presence at the extensively used plots after the clipping treatment. The results obtained here contribute to a better understanding of the importance of vegetation characteristics on surface‐runoff formation, thus, on soil‐erosion control. Overall, we delineate vegetation parameters to be crucial in soil‐erosion control which are directly modified by the land‐use management.  相似文献   

4.
为了分析植被覆盖对黄土高原坡面水土流失的影响，量化土壤侵蚀的植被覆盖阈值，基于模拟降雨数据分析了植被覆盖对土壤侵蚀的作用机制，利用绥德、西峰、天水等黄土高原高原典型地区的野外径流小区定位观测资料，探讨了不同覆被类型下植被覆盖控制径流和土壤侵蚀的有效性，确定了不同覆被类型下植被覆盖调控径流和防治土壤侵蚀的植被覆盖下限阈值和上限阈值。结果表明：(1)植被覆盖度的提高增加了土壤入渗、减少了径流量、延缓了径流流速、增加了土壤抵抗侵蚀的能力。(2)坡面径流量随植被覆盖度呈幂函数或指数函数下降，土壤侵蚀量随植被覆盖度呈指数函数、幂函数或者对数函数下降。(3)总体而言，不同地区植被控制土壤侵蚀的下限阈值在20%～30%,上限阈值在50%～70%。(4)土壤质地、植被类型、甚至植被的根系特征对植被控制径流和土壤侵蚀的效益有重要影响。研究结果为黄土高原水土保持工作提供研究依据。  相似文献   

5.
Semiarid karst landscapes represent an important ecosystem surrounding the Mediterranean Basin for which little is known on runoff generation. Knowledge of the sources and patterns of variation in infiltration–runoff processes and their controls is important for understanding and modelling the hydrological functions of such ecosystems. The objectives of this paper are to determine the infiltration rates and their controls in a representative mountain karst area (Sierra de Gádor, SE Spain) at micro-plots and to investigate the integrated response of rainfall on a typical hillslope. Rainfall simulations in micro-plots and natural rainfall-runoff monitoring on a hillslope were carried out complementarily. We investigated the role of soil surface components (vegetation, rock outcrop, fracture, and soil crust), topographic position, antecedent soil moisture, and rainfall characteristics in regulating infiltration–runoff processes. Results of rainfall simulation revealed the importance of vegetation cover and the presence of rock fractures in promoting the infiltration in the limestone karst landscape, while bare patches and rock outcrops acted as sources for runoff. All plots with > 50% vegetation cover had no runoff with up to 55 mm h− 1 of simulated rain. In contrast, nearly all bare plots had runoff under the same simulated rain, with runoff coefficients ranging from 3.1 to 20.6% on dry soil surface conditions, and from 2.0 to 65.4% on wet soil surfaces. Runoff coefficients amounted to 59.0–79.5% for rock outcrops without cracks, but were drastically reduced by the presence of cracks. The surfaces with rock fragments resting on the soil (generally located in the middle of the slopes) prevented more effectively the runoff generation than those surfaces where rock fragments were embedded in the top soil. Antecedent soil moisture had significant impact on runoff generation, with wet soil having doubled runoff coefficient, shortened time to runoff, and increased runoff rate compared to the same but dry soil. Linear regressions indicated that the main controls for constant infiltration rate were the cover percentages of vegetation and litter, plus rainfall intensity; while the major controls for runoff coefficient were the bare soil and vegetation coverage, plus rainfall intensity. High infiltration rates measured at the micro-plots agreed with low intra-event runoff coefficients (mostly below 1%) observed under natural rainfalls at the hillslope. Runoff depth and coefficient at the hillslope was significantly correlated with rainfall depth, maximum hourly rainfall intensity and antecedent precipitation over 20 days (AP20). During the 1.5-year monitoring period from Sep-2003 to Mar-2005, the overall infiltration was 41% of the total rainfall amount and the maximum infiltration rate was almost 94% of the largest single rainfall event. The results from this study contribute to improved understanding of the magnitude and controls of the surface runoff in semiarid karst mountain areas.  相似文献   

6.
不同自然植被管理措施对红壤丘陵果园水土流失的影响   总被引：6，自引：2，他引：6  
丘陵是“山—丘—谷”的过渡地带，生态系统脆弱，一旦植被遭破坏，极易水土流失。在红壤丘陵园地应用除草剂调控水土流失试验结果表明：与传统的清耕法相比，克无踪、草甘膦、草草克、克克草和生草法可使地表径流量分别减少47.7%，20.8%，31.4%，41.3%和45.5%；可使土壤侵蚀量分别减少52.4%，39.0%，48.1%，50.7%和55.2%；可使土壤养分分别减少50.2%，37.0%，41.8%，45.8%和60.3%。除草剂对杂草再生率影响，与生草法比较，克无踪可达67.2%，草甘膦达30.3%，草草克36.8%，克克草51.2%和清耕法55.1%；克无踪调控杂草效果分别是草甘膦的2.2倍，清耕法的1.2倍。克无踪调控杂草效果显著，有望成为红壤丘陵园地培肥与水保相得益彰的有效措施。  相似文献   

7.
The effectiveness of a surface cover material (e.g. geotextiles, rock fragments, mulches, vegetation) in reducing runoff and soil erosion rates is often only assessed by the fraction of the soil surface covered. However, there are indications that soil structure has important effects on the runoff and erosion-reducing effectiveness of the cover materials. This study investigates the impact of soil pre-treatment (i.e. fine tilth versus sealed soil surface) on the effectiveness of biological geotextiles in increasing infiltration rates and in reducing runoff and interrill erosion rates on a medium and steep slope gradient. Rainfall was simulated during 60 min with an intensity of 67 mm h−1 on an interrill erosion plot having two slope gradients (i.e. 15 and 45%) and filled with an erodible sandy loam. Five biological and three simulated geotextiles with different cover percentage were tested on two simulated initial soil conditions (i.e. fine tilth and sealed soil surface). Final infiltration rates on a sealed soil surface (7.5–18.5 mm h−1) are observed after ca. 10 min of rainfall compared to ca. 50 min of rainfall on an initial seedbed (16.4–56.7 mm h−1). On the two tested slope gradients, significantly (α = 0.05) smaller runoff coefficients (RC) are observed on an initial seedbed (8.2% < RC < 59.8%) compared to a sealed soil surface (75.7% < RC < 87.0%). On an initial seedbed, decreasing RC are observed with an increasing simulated geotextile cover. However, on an initial sealed soil surface no significant effect of simulated geotextile cover on RC is observed. On a 15% slope gradient, calculated b-values from the mulch factor equation equalled 0.054 for an initial fine tilth and 0.022 for a sealed soil surface, indicating a higher effectiveness of geotextiles in reducing interrill erosion on a fine tilth compared to a sealed soil surface. Therefore, this study demonstrates the importance of applying geotextiles on the soil surface before the surface tilth is sealed due to rainfall. The effect of soil structure on the effectiveness of a surface cover in reducing runoff and interrill erosion rates, as indicated by the results of this study, needs to be incorporated in soil erosion prediction models.  相似文献   

8.
选择较合理的植被指标,对提高植被水土保持效益评价精度具有重要理论与现实意义。本研究基于福建省长汀县河田镇12个土壤侵蚀试验小区2007年和2008年2 a的降雨、径流、泥沙数据及各小区的植被叶面积指数(LAI)、植被覆盖度(VFC)资料,利用对比与统计分析方法,研究了2种植被覆盖类型(纯马尾松林、马尾松林草)和不同覆盖度(80%、60%、45%、30%、15%和5%)的红壤水土流失特点,探讨了LAI与VFC定量表征水土流失关系的稳定性和可靠性。结果表明,与裸地小区比较,马尾松纯林覆盖一定程度上降低了土壤侵蚀模数,对径流的减少作用并不明显;而马尾松林草覆盖可显著减少25%左右的径流,土壤侵蚀模数减少也在90%以上,林草结合的植被覆盖结构具有更强的水土保持功能。以LAI表征2种植被覆盖类型的土壤侵蚀模数,均能达到显著水平(p0.05);而以VFC来表征土壤侵蚀模数,仅马尾松林草覆盖类型达到了显著水平。选择LAI表征土壤侵蚀模数来评价植被水土保持效益,将更为稳定和可靠。  相似文献   

9.
Considerable attention has been paid recently to the influence of surface rock fragments on hydrological and erosional processes, although much of this research has been done on disturbed soils under laboratory conditions. I have studied the effects of rock fragments on soil infiltration, runoff and erosion under field conditions using simulated rainfall on bare areas of natural soils within typical Mediterranean scrubland characterized by patchily distributed vegetation. Sample areas were chosen where rock fragments cover more than half the surface within unvegetated patches. Twenty experiments were carried out by applying rain at an intensity of 55 mm h?1 for 60 minutes. This approach shows that rock fragments (i) retard ponding and surface runoff, and (ii) give greater steady‐state infiltration rates and smaller interrill runoff discharges, sediment concentrations and interrill erosion rates. A second set of six experiments was carried out by applying rainfall at an intensity of 55 mm h?1 for two runs of 60 minutes. The second run was initiated 10 minutes after the first. During this interval, surface rock fragments were removed in order to measure their effects on infiltration, interrill runoff and erosion rates. In this way, I showed that water and soil losses are reduced by the rock fragments. After the removal of rock fragments the steady‐state infiltration rate diminished from 44.5 to 27.5 mm h?1 and the runoff coefficient, sediment concentration and erosion rates were, respectively, 3, 33 and 39 times greater than they were before the rock fragments were removed.  相似文献   

10.
Vegetation cover is an important parameter used in assessing the relationship between vegetation and soil erosion. However, the intensity of soil erosion actually changes not only with vegetation cover but also with differences in vegetation type and structure. How to integrate the cumulative effect of the different growth forms making up a vegetation community into one index for inclusion in soil loss predictive equations is an open research question. This paper proposes a method to separately measure the cover of different vegetation strata, estimate their contribution to reducing soil loss, and then to integrate this into a single vegetation index called the stratified vegetation cover index (Cs). The results show that Cs is more effective than projected vegetation cover for the assessment of soil erosion and also can overcome the disadvantages of vegetation indices such as NDVI. This means that Cs is a good substitute for vegetation cover or cover-related vegetation indices in studies on the relationship between vegetation and soil erosion. The concept of Cs may help the local governors or forest department understand the importance of vegetation structure and make right management decisions.  相似文献   

11.
雨强和植被覆盖度对红壤坡面产流产沙的影响   总被引：2，自引：3，他引：2  
为探究雨强和植被覆盖度对花岗岩红壤坡面产流产沙的影响,通过室内人工模拟降雨试验,分析了不同雨强(0.5,1.0,1.5 mm/min)和植被覆盖度(0,20%,40%,60%)下坡面侵蚀的产流、产沙规律及相关关系。结果表明:(1)同一雨强下,初始产流时间随植被覆盖度增加而延迟,并随雨强增大而提前,雨强越大,产流时间提前越明显;(2)各坡面径流率、侵蚀率随植被覆盖度增加而减小,且植被覆盖度越高,径流率和侵蚀率波动范围越小,侵蚀过程越稳定;(3)有植被覆盖的坡面,产沙主要以0.25 mm的水稳性团聚体为主,侵蚀泥沙中0.25 mm水稳性团聚体比重随雨强增大而增加,且增加的幅度随覆盖度的提高而减小;(4)雨强、植被覆盖度均与产流时间、径流率、侵蚀率呈现极显著相关关系(P0.01),且坡面产流过程与雨强变化的相关性大于其与植被覆盖度变化的相关性,坡面产沙过程与植被覆盖度变化的相关性大于其与雨强变化的相关性,不同雨强下植被覆盖坡面累积径流量和累积产沙量关系符合幂函数模型(R~20.98)。研究结果可为南方红壤丘陵区水土流失治理与生态恢复提供科学参考。  相似文献   

12.
Vegetation cover plays a major role in the restoration and stabilization of disturbed systems. The analysis of relationships between restored vegetation and soil hydrology has special relevance for the evaluation and operation of mining reclamation, particularly in Mediterranean-Continental environments, where climatic conditions restrict the development of continuous vegetation cover. The effect of herbaceous vegetation cover on soil hydrology was analysed by means of rainfall simulation (63 mm h− 1; 0.24 m2) in reclaimed soils derived from opencast coal mining (a non-saline and clay-loam textured spoil) in central-eastern Spain. A total of 75 simulation experiments were conducted at three different times throughout the year (late winter, summer and autumn) to control the influence of seasonal climatic fluctuations. Sediment concentrations in runoff and the runoff coefficient decreased exponentially with vegetation cover, while increases in steady infiltration rates were obtained with vegetation cover. Additional delays in runoff responses (longer time to runoff start and stabilization) and increases in the wetting front depth were observed with vegetation cover. Seasonal variations in soil surface state and moisture strongly influenced hydrological responses; although the influence of season on the analysed hydrological responses was attenuated by vegetation cover, especially in the case of infiltration rates. We also determined a practical ground cover threshold for site restoration and evaluation of over 50% vegetation cover, which could help achieve an optimum biological control of hydrological soil responses in the studied environment.  相似文献   

13.
北京山区石灰性褐土草地雀麦播种后第2a,研究了其主要生物学特性对土壤物理性质及坡地水土流失的影响.结果表明,草地雀麦种植1a后,4月份返青,7月份地表覆盖度可达85%以上,8月份植株密度最大,地上、地下生物量为2322.6 kg/hm2和5623.0 kg/hm2,且0-10 cm地下生物量是草地雀麦地下水土保持功能发挥的主要部分.北京地区石灰性褐土土壤侵蚀的主要形式是坡面地表径流流失,降雨与植物生物学特性是坡地土壤侵蚀的主要影响因素,且不同因素作用大小表现为:地表径流量＞降雨量＞降雨强度＞坡度＞植被盖度＞植被高度＞植株密度.草地雀麦种植第2a,可以明显改善石灰性褐土土壤物理性质,减小土壤容重2.4%～9.8%,降低土壤紧实度,提高土壤入渗率,坡地地表年径流损失量与土壤侵蚀模数仅为13.5 mm和105.2 t/(km2·a),保水固土能力达到65.4%和98.1%,水土保持效果显著.  相似文献   

14.
Two consecutive years of investigation on soil surface features, surface runoff and soil detachment within 1-m2 microplots on 40% slope highlighted the effects of land-use change, vegetation cover and biological activity on the water pathways in Northern Vietnam. Three replicate plots were set up on each of five land-uses: cassava (CAS), grass fodder of Bracharia ruziziensis (BRA), a 3-year old fallow (FAL), tree stands of Acacia mangium and Venicia montana (FOR), and a fallow with regrowth of Eucalyptus regularly cut (EUC). The second year, two of the microplots under FAL and EUC were treated with herbicide (FALh, EUCh), one of them was burnt (FALh+b, EUCh+b). The highest yearly surface runoff coefficient of 16%, and soil detachment rate of 700 g m− 2 yr− 1 in average with a maximum of 1305 g m− 2 yr− 1 have been recorded under CAS. On FALh and FALh+b, runoff ratios were 8.7 and 13.5%, respectively and detachment rates were 86 and 389 g m− 2. On FAL and BRA the yearly runoff ratio varied from 5.9 to 9.8% but the detachment rate was limited at 24 to 35 g m− 2. FOR and EUC annual runoff was ≤ 3.1% and annual soil detachment ≤ 71 g m− 2. These values were very low compared to the values reported on steep slopes in Laos within similar climate and vegetation cover.The runoff and detachment rates underlined the importance of rainfall intensities, soil physical properties, soil surface features, soil vegetation cover and biological activity. The annual surface runoff was highly correlated to the soil surface crusting. CAS and BRA plots were prone to crusting especially after weeding at the onset of the rainy season, when the soil surface was still uncovered. Soil bioturbation (earthworm casting activity) was the second factor that explains local variation of surface runoff and soil detachment. The continuous production of earthworms casts on soil surface, especially on FOR and EUC microplots, induced a marked surface roughness and reduced the surface runoff. The production of casts was very limited in FAL and completely absent in CAS microplots. So it is evident that our results confirm the deleterious effects of cassava on soil and water conservation.  相似文献   

15.
This study was conducted in Champagne vineyards in France, and the objectives were to compare the main cultivation practices in Champagne vineyards and to specify the conditions required for the optimum effect of inter‐row grass cover on runoff and erosion in experimental plots of 0.25 m² under simulated rainfall. Three types of ground cover were studied. In the bark‐and‐vine‐prunings plots, the runoff coefficient (RC) ranged from 1.3 to 4.0% and soil losses were <1 g/m2/h. In the bare soil (BS) plot, the highest RC of the study was found (80.0%) and soil losses reached 7.4 g/m2/h. In the grass cover plots, the RC and amount of eroded soil were highly variable: the RCs ranged from 0.4 to 77.0%, and soil losses were between less than 1 and 13.4 g/m2/h. Soil type, soil moisture, slope and agricultural practices did not account for the variability. In fact, the density of grass cover in the wheel tracks explained a portion of this variability. The lack of grass in the centre of the inter‐row allowed for a preferential flow and created an erosion line in the wheel tracks where the soil was compacted. This study showed that grass cover in a vineyard was not necessarily sufficient to reduce surface runoff and prevent soil erosion. To be effective, the grass cover must be dense enough in the wheel tracks of agricultural machinery to avoid RCs close to the RC achieved with BS.  相似文献   

16.
黄丘区野外坡面产流产沙过程对不同植被覆盖结构的响应   总被引：2，自引：2，他引：0  
植被覆盖结构是影响坡面侵蚀过程的重要因素,通过在黄丘区罗玉沟流域开展自然植被覆盖坡面野外模拟降雨试验,分析了90 mm/h雨强条件下地下根系、地下根系+地表结皮层和地下根系+地表结皮层+植被冠层3种不同覆盖结构对坡面产流产沙过程影响。结果表明:植被根系层次对增强土壤入渗起主导作用,使土壤入渗量增加67%,稳定入渗率增加39.7%;3种植被覆盖结构中,地表结皮层对产流和产沙具有最好的调控作用,减流贡献率和减沙贡献率分别为43%和67%;根系小区和裸地小区累积产流量与累积产沙量之间呈幂函数关系,随着植被覆盖结构的叠加,累积产流量与累积产沙量之间呈线性函数的关系;多层次植被覆盖结构能够延长坡面侵蚀过程的发育期,缩短活跃期。研究结果对定量评价植被措施的减水减沙作用具有重要意义。  相似文献   

17.
Twelve soil‐preparation techniques used in afforestation were applied and 16 environmental variables were measured to test their effects on vegetation abundance, diversity, and cover in semiarid abandoned farmland located in southeastern Spain. The soil‐preparation techniques consisted of punctual treatments—making a hole and constructing a plantation bench with different types of machinery; linear treatments—making furrows along contour lines; and surface treatments—that prepare the soil in general all over the plantation surface. Variables measured were the surface and volume affected by the soil‐preparation treatments, distance from sample quadrats to the remnants of natural vegetation, surface runoff estimated by slope angle, and some edaphic characteristics such as gravel content, active lime, CaCO3, phosphorus, oxidizable organic matter, total soil nitrogen, pH, potassium, salinity, and clay, silt and sand content. The multivariate contrasts obtained demonstrated the existence of a significant relationship between species, samples and environmental variables. Both the distance of the quadrats from the remnants of natural vegetation and the volume of soil removed in different treatments were very weighty variables in the explanation of the variance of data, negatively affecting overall vegetation development. The accumulation or loss of surface runoff and the CaCO3 content in soil were also important variables to explain abundance and diversity data. However, not all the species responded to the variables analysed in the same way. Identification of non‐uniform spatial patterns that significantly affect vegetation suggests that afforestation policies and conservation and management strategies in these semiarid abandoned lands should always take into consideration the quality of the whole landscape. Voluminous soil treatments for afforestation should be avoided. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

18.
Hillslopes are thought to be most susceptible to enhanced surface runoff and erosion immediately following wildfire due to removal of protective vegetation and litter cover, and in many cases a fire-induced reduction in soil wettability. This enhanced susceptibility declines as vegetation and litter layer recover. For logistical reasons, however, few studies have been able to examine the responses of burnt terrain immediately following burning and little is therefore known about the effect of the wettable ash layer that often covers the ground until it is redistributed or removed by wind or water erosion.  相似文献   

19.
We examined runoff and sediment transport associated with large-scale construction projects in Fujian Province, China. Six experimental plots, comprised of four plot types, were designed to mimic typical conditions immediately following disturbance. It was found that natural vegetative cover reduces both runoff and erosion by approximately 36 and 7457 times over bare ground, and 16 and 1801 times over typically planted grasses, respectively. The increase in erosion associated with the replacement of native vegetation with bare ground or grasses due to large-scale infrastructure projects in Fujian from 1999 to 2004, amounted to an estimated loss of 1.76 × 107 tonnes of top soil and 3.04 × 108 m3 of surface runoff from the province during the bare soil construction phase, and an additional 4.25 × 106 tonnes of top soil and 1.35 × 108 m3 of surface runoff from the province associated with the first year of operation for each project. This has implications for frequency and occurrence of landslides and other geographic hazards, the transport of chemicals into waterways, the transport of goods through shipping passages, and the fertility of land in Fujian.  相似文献   

20.
黄丘一区坡面水土流失规律研究   总被引：7，自引：0，他引：7  
<正> 为了探索黄丘—区坡面水土流失规律,寻求水土流失与其影响因素之间的关系,为合理利用水沙资源、水土保持规划与措施设计提供科学依据,我们进行了该项试验研究。 一、径流场布设概况 1954～1958年,我们在绥德辛店沟布设径流小区,由9个逐步发展到66个;1958～1961年,径流小区缩减为8个;1962～1964年,在韭园沟内王茂庄大咀峁布设自然地貌全坡长径  相似文献   

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