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1.
The analysis of long-term (since 1947) data on the water content of the upper 3-m-thick layer in the Streletskaya Steppe chernozems
under annual mowing showed that the weather changes during the last decades (from 1972–1973 to 2005–2006) resulted in an increase
in the soil wetting depth during the fall-winter-spring period and the frequency of the percolation, a decrease in the water
consumption from the 150- to 300-cm layer during the growing season, and a decrease in the water deficit in the fall. Therefore,
the total water content of the steppe chernozems increased, although to a significantly lesser degree than that found for
the steppe plot with a succession of woody-shrub vegetation. In a perennial fallow, the water content of the soil layer also
increased. The water supply of the 0- to 160-cm layer of chernozems under winter wheat and corn underwent no significant changes. 相似文献
2.
N. G. Minashina 《Eurasian Soil Science》2009,42(7):807-815
Experience in irrigation of chernozems in the steppe zone of Russia for a period from 1950 to 1990 is analyzed. By the end of this period and in the subsequent years, the areas under irrigation reduced considerably, and the soil productivity worsened. This was caused by the improper design of irrigation systems, on the one hand, and by the low tolerance of chernozems toward increased moistening upon irrigation, on the other hand. The analysis of the factors and regimes of soil formation under irrigation conditions shows that irrigation-induced changes in the soil hydrology also lead to changes in the soil physicochemical, biochemical, and other properties. In particular, changes in the composition of exchangeable cations lead to the development of solonetzic process. In many areas, irrigation of chernozems was accompanied by the appearance of solonetzic, vertic, saline, and eroded soils. The development of soil degradation processes is described. In general, the deterioration of irrigated chernozems was related to the absence of adequate experience in irrigation of steppe soils, unskilled personnel, improper regime of irrigation, and excessively high rates of watering. In some cases, the poor quality of irrigation water resulted in the development of soil salinization and alkalization. To improve the situation, the training of personnel is necessary; the strategy of continuous irrigation should be replaced by the strategy of supplementary irrigation in the critical periods of crop development. 相似文献
3.
L. P. Galeeva 《Eurasian Soil Science》2012,45(2):206-219
The trends of the soil-forming process and the changes in the main physicochemical properties of leached chernozems under
different phytocenoses (virgin land, cereal-row crop rotation, and sown perennial grasses (Galega + Bromopsis)) were studied. In the cereal-row crop agrocenoses, as compared to the virgin land, the thickness of the humus horizon increased,
and the depth of effervescence remained the same. The reaction of the leached chernozems in the phytocenoses did not change,
and the sum of exchangeable bases increased in the following sequence: sown perennial grasses < cropland = virgin land. The
humus content and its reserves in the 0- to 20-cm soil layer of all the agrophytocenoses were almost the same, and the total
nitrogen content decreased in the following sequence: virgin land = cropland > perennial grasses. On the contrary, the total
phosphorus content, its mobility, the phosphorus capacity and reserves, and the sum of the mineral phosphates increased in
the same order. The highest content of exchangeable potassium was found in the soils of the virgin land and the lowest one,
in the soils of the cereal-row crop agrocenosis. The perennial grasses consumed the greatest amounts of potassium and nitrogen
and the spring wheat of the cereal-row crop rotation, those of nitrogen. The removal of nitrogen was 1.6–1.8 and 2.3 times
greater than the losses of phosphorus and potassium, respectively. 相似文献
4.
通过田间小区试验,研究了猪场废水处理工艺中3个阶段出水（原水、厌氧水和仿生态塘水）与地下水1∶5混水和厌氧水不同灌溉量灌溉对土壤中交换性盐基离子含量的影响。结果表明,厌氧水不同灌溉量对土壤中交换性钾含量影响显著,与对照相比,厌氧水高量灌溉、中量灌溉、低量灌溉分别使0～20cm和20～40cm土层中交换性钾含量提高了291.76%、152.70%、83.11%和116.10%、74.29%、49.85%;对交换性钠、钙、镁含量有一定影响,但处理间未达到显著水平。不同阶段出水混水灌溉对交换性钾、钠、钙、镁的含量处理间未达到显著水平,但土壤中交换性钾和钠含量在0～20cm和20～40cm和处理间呈现了相反的变化趋势,验证了竞争吸附点位理论。 相似文献
5.
Changes in the physical properties of soils in the Kamennaya Steppe under the impact of shelterbelts
The physical properties of ordinary chernozems and meadow-chernozemic soils under different land management practices (maple,
larch, birch, and pine sections of the shelterbelts; continuous (since 1959) fallow; and arable field (since 1952)) were studied
in the Kamennaya Steppe. The soils had favorable physicochemical properties, light clayey texture, and high microaggregation
independently from the type of land management. The long-term impact of the shelterbelts improved the soil structure in the
upper part of the humus horizon: the content of agronomically valuable aggregates increased, the content of coarse aggregates
(>10 mm) decreased, the aggregation coefficient increased by 3.7–4.3 times, and the water stability of the aggregates became
by 8–12% higher. The soils under the shelterbelts were characterized by minimum values of the bulk density and solid phase
density and by maximum values of the total, active, and air porosities. At the same time, no considerable differences between
water reserves in the studied range of soils were detected. The ratio of the optimum productive water range to the active
(productive) water range (OPWR/AWR) within the upper soil meter varied from 0.42–0.44 to 0.45–0.54. This points to changes
in the character of perched water: the content of intra-aggregate capillary-perched water decreases, and content of film perched
water increases down the soil profile. 相似文献
6.
The phenomenon of mineralization (biological mineralization) of organic matter in chernozems has been studied. A decrease
in the content of Corg with time can be considered an index of the organic matter mineralization. It is suggested that the humus horizons of modern
chernozems contain the pools of organic matter of different ages: easily decomposable organic matter, labile biologically
active humus, stable biologically active humus, and relatively inert humus. The composition and mean residence times of these
pools and their contribution to the total organic matter content have been estimated. The particular types of the biological
mineralization have been determined on the basis of the comparison between the velocities of mineralization (M) and humification
(H) processes: total unidirectional mineralization (M ≫ H), equilibrium mineralization (M ∼ H), nonequilibrium mineralization
(M> <H), and zero mineralization. The separation of subtypes is based on data on the relative rates (%) of the organic matter
mineralization. On the basis of available experimental data on chernozems buried under kurgans and in loess sediments (with
the age of up to 800 ka), the quantitative relationship of the humus content in the buried soils on their age has been found;
it has an exponential shape. During the first 100 ka after the soil burial, the soil humus content gradually (with a slowing
intensity) decreases from 100–75 to 6.5% of its content in the virgin chernozems. Then, 100–1000 ka after the soil burial,
the soil humus content remains approximately constant (6.5% of the initial level, or 0.3% of the soil mass). The rates of
mineralization have been estimated. It is shown that the elemental composition (C, H, N, O) of humic acids remains relatively
stable for a long time due to the regeneration of the chemical structure of humus (matric restoration of humus). It is suggested
that several different forms of humus related to pedogenesis should be distinguished in the biosphere. The renewable humus
in the equilibrium state with the environment is typical of the open biospheric (soil) systems. The fossil humus, whose content
decreases with time, and whose composition remains stable, is typical of the semiclosed and closed systems. With time, it
transforms into residual humus, whose content and composition remain stable. The fossilized organic matter in the fossil soils
and sediments of the past geological epochs (Mesozoic and Paleozoic) considerably differs from the renewable, fossil, and
residual humus. 相似文献
7.
In the profiles of ordinary and southern chernozems, the total numbers of amylolytic microorganisms and actinomycetes decreased
with the depth by 2.4–4.2 and 3.4 times, respectively; in the profiles of solonetz and solonchak soils, by 4.2–5.3 and 4.8
times, respectively. In the genetic horizons of the ordinary and southern chernozems, the share of actinomycetes amounted
to 29–30% of the total population of microorganisms; in the saline soils, it increases with the depth from 23 to 43%. In the
chernozems, Streptomyces violaceomaculatus (Roseus section), St. sporoherbeus (Azureus), St. aerionidulus (Cinereus), St. enduracidicus (Cinereus), and St. grisinus (Cinereus) predominated; in the saline soils, St. violaceomaculatus and St. aerionidulus prevailed. In the ordinary chernozem, the Berger-Parker index was 1.5 times higher than in the southern chernozem. High similarity
was found between the streptomycete communities in the chernozems (the Sorensen coefficient was 0.78). In the solonetzes,
the species richness of the streptomycetes was higher by 1.7 times than in the solonchaks. In the chernozems, the similarity
of the streptomycete communities was higher than in the solonchaks (0.78 and 0.60, respectively). 相似文献
8.
P. S. Lozovitsii 《Eurasian Soil Science》2012,45(3):290-302
The results of long-term studies (1957–2007) of the changes in the morphology of soil profiles and in the reserves and fractional
composition of the humus in the soils of the Ingulets irrigation system are discussed. After 50 years of irrigation, the boundaries
of the genetic horizons shifted downward by 15–30 cm. The redistribution of the humus took place: its content decreased to
a low level in the plow layer of the irrigated and rainfed soils and significantly increased in the layer of 60–100 cm so
that the reserves of humus in the layer of 0–100 cm somewhat increased and corresponded to a moderate level. The distribution
of humus in the soil profiles was characterized by the gradual lowering down the soil profile. The concentration of nitrogen
in the humus of the irrigated southern chernozems was very low. The degree of humification of the soil organic matter was
high. The humus was of the humate type in the upper horizons and of the fulvate-humate type in the lower horizons. 相似文献
9.
The study of post-irrigational and virgin soils of solonetzic complexes on the Privolzhskaya sandy ridge has shown that the
morphological features of paleohydromorphism and the features acquired during the 30-year-long irrigation period are well
preserved in the soil profiles. After the cessation of irrigation, the upper boundary of effervescence has shifted closer
to the soil’s surface; fine-crystalline gypsum has appeared in channel pores. When the groundwater level is deeper than 4
m, the boundary of effervescence is higher than the boundary of the gypsum concentrations. When the groundwater level is about
3 m, these two boundaries coincide. If the groundwater level is higher than 2.5 m, the boundary of the effervescence is found
deeper than the boundary of the gypsum concentrations. Salinization and solonetzization of the post-irrigational soils have
not been identified. In the virgin soils with the groundwater level of 2.3–3.0 m, the content of exchangeable sodium in the
upper 30 cm is similar to that in the post-irrigational soils. In the deeper layers, the exchangeable sodium content in the
solonetzes and chestnut soils rises up to 25% and more; in the meadow-chestnut soils, it constitutes up to 4% of the sum of
exchangeable bases. 相似文献
10.
The total mercury content has been determined in gray forest soils, chernozems, chestnut soils, and in different parent materials
in the Transbaikal region. The mercury content is below the clarke value in the intrusive, effusive, and alluvial soil-forming
rocks (0.004–0.024 mg/kg). In the humus horizons of the soils, it reaches 0.011–0.026 mg/kg, which is higher than the clarke
value for the pedosphere. The mean background content of mercury in the soils of the Transbaikal region is 0.018 mg/kg. No
significant positive correlation between the mercury content and the humus content of the soils has been revealed. 相似文献
11.
N. R. Hulugalle T. B. Weaver H. Ghadiri A. Hicks 《Land Degradation \u0026amp; Development》2006,17(5):527-540
Historically many towns in inland Australia disposed of their treated sewage by pumping into local rivers. This is no longer a feasible proposition. Alternatives to river pumping include irrigation and/or aquaculture. As treated sewage effluent may contain large amounts of nitrogen, phosphorus and sodium salts, if not managed carefully, soil salinity, sodicity and nutrient accumulation could increase. The objective of this study was to evaluate if gypsum application had any effect on soil‐quality changes in a Vertisol due to irrigating a cotton–wheat rotation with tertiary treated sewage effluent. The treatments were application of 2·5 t ha−1 of gypsum in June 2000 before commencing irrigation and an untreated control. Annually, between June 2000 and April 2004, irrigation water quality and soil changes in nitrate‐N, EC1:5, pH, organic carbon, Cl, dispersion index, and exchangeable cations to a depth of 1·8 m were measured and deep drainage inferred with the chloride mass balance method. Cotton lint yield and fibre characteristics were also evaluated. Irrigation with treated sewage effluent increased exchangeable Na in all depths, and exchangeable Ca and K in the clayey‐textured surface 0·6 m, but decreased exchangeable Ca and K, and SOC in the coarser clay‐loam‐textured depths > 0·6 m. Nitrate‐N leaching, associated with deep drainage had occurred, as the crops had not used all the N in irrigation water. Gypsum application decreased exchangeable Ca, increased dispersion and during the 2003–2004 season deep drainage, but had no effect on salinity, sodicity or pH. Application of commercial gypsum at sub‐optimal rates with sodium‐rich irrigation water is, therefore, unlikely to improve soil properties. Stubble incorporation before sowing cotton in 2003 appears to have mobilized gypsum applied during 2000. Gypsum application reduced cotton lint yield and fibre quality during 2003–2004. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
12.
干旱绿洲长期微咸地下水灌溉对棉田土壤微生物量影响 总被引：5，自引：1，他引：4
由于淡水资源的缺乏,利用微咸地下水灌溉是干旱绿洲普遍采用的一种灌溉措施。该文对北疆棉区长期利用微咸地下水灌溉的土壤微生物和酶活性进行了研究。结果表明,长期微咸地下水灌溉土壤的含盐量比渠水灌溉上升61.5%,显著增加了棉田耕层土壤盐分（P＜0.05）,土壤可交换性钠百分率（ESP）升高3.2倍,并造成土壤碱化。微咸地下水灌溉纤维素酶、脲酶等、转化酶及过氧化氢酶4种酶活性分别降低了21.3%、50.9%、50.0%和10.5%,但在微咸地下水灌溉条件下多酚氧化酶和碱性磷酸酶的活性显著升高。微咸地下水灌溉对土壤微生物有明显抑制作用,长期微咸水灌溉使土壤微生物量碳、氮分别降低24.4%和42.4%,但对微生物量磷影响不显著。微生物量和酶活性与棉田土壤肥力密切相关,长期微咸地下水灌溉导致有机质、全氮分别降低26.8%和28.0%。长期微咸地下水灌溉影响了土壤生物质量,不利于绿洲农田土壤的持续利用。 相似文献
13.
The high degree of base saturation and high cation exchange capacity with an appreciable dominance of calcium are related to the high carbonate content in parent rocks, high content of humus in chernozems, and abundant fine material in their profiles. These are characteristic features of prevalent soils in the Kamennaya Steppe. Almost all soils of monitoring and experimental plots have an appreciable spatial variation in exchangeable bases. The obtained data indicate that the content of adsorbed calcium in the exchangeable complex of the soil decreases with increasing shares of adsorbed magnesium and partially sodium. 相似文献
14.
Shammas K. O'Connell A. M. Grove T. S. McMurtrie R. Damon P. Rance S. J. 《Biology and Fertility of Soils》2003,38(4):228-235
Amounts of nutrients in harvest residues and their contribution to nutrient cycling were quantified following logging of a Eucalyptus globulus plantation in south-western Australia. An estimated 64 t ha–1 of leaf, bark and branch material less than 3 cm in diameter was deposited on the forest floor during harvesting. Leaves contributed about one-third of the residue dry weight but accounted for almost three-quarters of residue-N stores (299 of 428 kg N ha–1) and 36% to 52% of P, K, Ca, and Mg stores. Stores of nutrients in slash were significant in comparison to amounts in surface soil (0–20 cm). Residue-N amounted to 11% of total surface soil N and cations stored in residues were equivalent to 23–114% of surface soil exchangeable cations. Decomposition of the leaf fraction of slash was rapid with more than 90% of dry weight released during the 105-week study. Bark and branch fractions of diameters 0.5, 1 and 2 cm lost 39%, 37%, 32% and 29% of dry weight, respectively, during the same period. Single and double exponential decay models fitted to the data indicated half lives ranging from 20 weeks for leaves and from 3 to 4 years for bark and the branch fractions. During decomposition, K was leached rapidly from all residue fractions, Mg and P were released at similar rates to dry weight, and Ca and N were released more slowly than dry weight. In the 105-week study period, 250 kg ha–1 of N, 20 kg ha–1 of P, 213 kg ha–1 of Ca, 298 kg ha–1 of K, and 63 kg ha–1 of Mg were returned to the soil from decomposing harvest slash. The leaf fraction was the major contributor to nutrient cycling, accounting for almost all of the N and Ca release and from half to three-quarters of the K, Mg and P released. Amounts of nutrients released from residues in the year following logging greatly exceeded quantities likely to be taken up by the newly established tree crop. 相似文献
15.
N. P. Chizhikova N. P. Sorokina N. B. Khitrov A. A. Samsonova 《Eurasian Soil Science》2010,43(1):85-93
Chernozems and agrochernozems of the Kamennaya Steppe agroforest landscape have a silty clay or clay texture and similar associations
of clay minerals. The plow horizons of the agrochernozems on a slope of 2°–3° to the Talovaya Balka have an increased content
of the smectite phase (50–70%) compared to the upper horizons of the chernozems on flat watersheds (30–50%) due to the lithological
discontinuity of the soil-forming material and the possible total removal of material on the slope by denudation. On slightly
eroded areas, the clay minerals display a more intense disturbance of their crystal lattice structures by pedogenetic processes,
which increase the degree of disorder in their layers and the accumulation of fine quartz in the clay fraction. In the areas
with more significant erosion of the humus horizon, the clay minerals are characterized by their perfect structure and clean
reflections, which are indicative of the outcropping of less weathered material from the middle part of the chernozem profile
less transformed by pedogenesis. 相似文献
16.
S. K. Biswas M. A. Mojid G. C. L. Wyseure 《Communications in Soil Science and Plant Analysis》2017,48(1):1-10
Irrigation with wastewater provides the opportunity to solve the problems of its disposal, reuse and water conservation. Freshwater, differentially diluted wastewater and undiluted wastewater (hereafter called wastewater) were used to grow wheat in sandy loam soil under fertilized and unfertilized conditions at the experimental farm of Bangladesh Agricultural University, Bangladesh. Fresh groundwater and wastewater of Mymensingh municipality were used to irrigate a wheat field for three consecutive years to examine the effects of wastewater application on soil properties. In this study, the properties of wastewater-irrigated soil were compared with freshwater-irrigated soil. The application of wastewater reduced the bulk density of the surface soil by 1.92% and augmented the porosity by 5.89%. The unsaturated hydraulic conductivity and water retention capacity of the soil were improved under wastewater irrigation. Soil pH increased due to wastewater application but decreased, to a smaller extent, due to fertilizer application. Soil electrical conductivity (EC) increased both with wastewater and with fertilizer application; both parameters changed significantly in the 0–20 cm soil layer. However, at the deeper layers, they were not affected by wastewater application. The organic carbon (C) and total nitrogen (N) level of the soils were higher under wastewater irrigation than under freshwater-irrigated soil. The organic C increased by 23.93% under wastewater irrigation in the top 20 cm soil layer. The N content of the soil showed similarities with the organic C contents. Available P and S concentrations were greater in the soil irrigated with wastewater compared with the soil irrigated with freshwater. The exchangeable cations – sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg) – also increased significantly with wastewater application. Thus, farmers are advised for irrigation with municipal wastewater to ease pressure on freshwater and to improve soil fertility. 相似文献
17.
再生水盐分在亚热带不同土壤中的迁移特性及其差异 总被引：5，自引：3，他引：2
为了合理评价再生水灌溉盐分对土壤环境的影响,分析盐溶液淋溶亚热带土壤流出液盐分变化规律及其对土壤化学性质的影响差异,该文采用定水头入渗法,模拟不同浓度钠盐溶液淋溶黏性潮土、沙性潮土、红壤、紫色土、水稻土等5种亚热带地区土壤,并观测土壤流出液电导率（EC）和pH值的差异。试验结果表明：1）高浓度盐溶液对黏粒含量较高的红壤、紫色土、黏性潮土的穿透能力弱于黏粒含量较低的水稻土和沙性潮土。同等浓度水平处理达到相同的穿透程度,酸性土壤（红壤、紫色土、水稻土）能承受更多的低质水量。2）盐分在土壤中的迁移速度主要由土壤理化性质决定,土壤黏粒含量、交换性铝含量会显著减缓盐分在土壤中的迁移能力,而土壤粉粒含量、EC、pH值以及交换性钙、镁含量会促进盐分在土壤中的迁移。盐分更容易穿透碱性土壤（黏性潮土和沙性潮土）而流出,碱性土壤流出液相对EC最大变化速率比酸性土壤高36%。基于Boltzmann函数拟合表明,入渗水盐浓度及土壤理化性质对模型参数有显著影响（P<0.05）。3）土壤化学性质受入渗液盐分浓度的影响程度不仅与土壤本身的化学性质有关,也与土壤质地中的粉粒、黏粒含量有极显著的关系（P<0.01）。各浓度盐溶液对碱性土壤的pH值影响不明显,对酸性土壤的pH值影响较大,其流出液pH值减少1.6～2.6个单位,其中红壤的pH值变化最大,其次为紫色土。入渗液EC高于4.77 dS/m的处理对土壤流出液的稳定pH值影响增幅不明显。因此,利用低质水灌溉时要依据土壤理化性质合理限定水中盐浓度。 相似文献
18.
19.
水氮对新疆南部麦后复种饲料油菜产量和品质的影响 总被引：2，自引：1，他引：1
采用完全随机区组田间试验研究了水氮对麦后复种饲料油菜产量及品质的影响,运用模糊相似优先比法分析了不同水氮处理下油菜产量及其4个典型饲料品质指标的变化特征。试验设置灌溉定额和施氮量2个因素：灌溉定额设置3 000 m3·hm-2（低水）、4 500 m3·hm-2（中水）和6 000 m3·hm-2（高水）3个水平;施氮量设置140.6 kg（N）·hm-2（低氮）、187.5 kg（N）·hm-2（中氮）和234.4 kg（N）·hm-2（高氮）3个水平。研究结果表明：适宜的水氮供应对饲料油菜单株鲜重、干重、产量、品质有显著的互作优势,水氮供应量过量或者不足,互作优势减弱。相同灌溉定额下饲料油菜单株鲜重、干重和产量随着施氮量的增加而提高;相同施氮条件下,随着灌水量的增加单株鲜重、干重和产量逐渐提高;提高灌溉定额的增产效应优于增氮,高水+中氮处理较低水+低氮处理产量提高86.90%。施氮量和水氮互作显著影响饲料油菜品质,中水中氮处理粗蛋白含量较高水高氮处理提高36.91%。中水低氮处理中性洗涤纤维含量最低,为32.66%,显著低于高水高氮处理;而高水低氮处理酸性洗涤纤维含量最低,为24.74%,较高水高氮处理低16.49%。高水高氮处理的粗脂肪含量最高（1.45%）。综合考虑产量与品质,新疆南部地区饲料油菜适宜的水氮措施为中水高氮[6 000 m3·hm-2,187.5 kg（N）·hm-2]。 相似文献
20.
采用田间大区试验,连续3年在河套重盐碱区开展了冬季咸水结冰灌溉试验研究,设置冬季咸水结冰灌溉(FSWI)和无灌溉对照(CK)两个处理,其中FSWI处理的灌水量为180 mm,矿化度为6.79～7.97 g·L~(–1),种植作物为青贮玉米,以分析不同处理下土壤水盐和钠吸附比(SAR)的周年动态以及对作物生长的影响,探究冬季咸水结冰灌溉对河套重盐碱地的改良效果。结果表明:与CK相比,FSWI处理显著改变了春季土壤水盐和SAR动态。0～20 cm土层,春季FSWI处理的土壤含水量显著高于CK处理,玉米苗期, FSWI处理的土壤含水量平均为24.3%,显著高于CK的21.6%; FSWI处理的春季土壤含盐量和SAR显著低于CK处理,其中, FSWI处理的土壤含盐量由灌溉前的33.86 g·kg~(–1)降低至玉米苗期的5 g·kg~(–1)以下,而CK处理土壤含盐量逐渐升高至玉米苗期的34.2 g·kg~(–1); FSWI处理土壤SAR由灌溉前的21.9降低至玉米苗期的9.86, CK土壤SAR则逐渐升高至玉米苗期的25.00。后续地膜覆盖和夏季降雨使FSWI处理的土壤含水量维持在23.0%以上,土壤含盐量保持在5 g·kg~(–1)以下,土壤SAR保持在9左右。20～40 cm土层与0～20 cm土层的土壤水盐和SAR变化趋势与表层一致,但没有表层变化剧烈。此外,随着灌溉年限的延长,同时期土壤含盐量和SAR呈逐年降低的趋势。FSWI处理玉米出苗率在70%以上,干物质产量为9～12t·hm~(–2),而CK处理由于土壤含水量较低(21.0%),并且土壤含盐量和SAR均较高,造成玉米出苗率极低,进而导致绝收。因此冬季咸水结冰灌溉改变了土壤水盐动态过程,变春季积盐为脱盐,显著降低了土壤SAR,并补充了土壤水分,保证了饲用玉米的正常种植和生长,这为该地区盐碱地改良和饲料作物种植提供了技术支持。 相似文献