Amelioration of Saline-Sodic Soils with Tillage Implements and Sulfuric Acid Application

Amelioration of saline-sodic soils through land preparation with three tillage implements （disc plow, rotavator and cultivator） each followed by application of sulfuric acid at 20% of gypsum （CaSO4-2H2O） requirement or no sulfuric acid application during crop growth period was evaluated in a field study for 2.5 years at three sites, i.e., Jhottianwala, Gabrika （Thabal）, and Thatta Langar, in Tehsil Pindi Bhattian, Hafizahad District, Pakistan. Within 2.5 years, there was a decrease in the salinity parameters measured （electrical conductivity, pH, and sodium adsorption ratio）, with a gradual increase in rice and wheat grain yields. It was observed that the disc plow, which not only ensured favorable yields but also helped improve soil health at all the three sites, was the most effective tillage implement. Also, application of sulfuric acid resulted in higher yields and promoted rapid amelioration of the saline-sodic soils.

GROUND WATER QUALITY IN THE INDUS PLAINS OF PAKISTAN AND ITS USE FOR CROP PRODUCTION DURING RECLAMATION OF SALINE-SODIC SOILS

The Indus Plains of Pakistan lies between 23°to 37°latitude and 61°to 76°longi-tude in the northern hemisphere. The total Canal Commanded Area (CCA) is about 13.50million hectares of which 11.21 million hectares are cultivated. At present, 103 millionacre-feet river flow is diverted into irrigation canals. In addition, 42 million acre feet of thegroundwater are being pumped through 257697 tubewells to supplement the canal supplies.

A Practical Model for Desodification of Saline-Sodic Soils of Central Khuzestan Plains, Khuzestan Province

The most important task in leaching practices is assessment of water quantity required for leaching of saline and saline-sodic soils. Therefore, reliable estimation of the required leaching water quantity is vital for reducing soil salinity to a desirable level. The present study aimed to investigate desodification of saline and sodic soils in central area of Khuzestan Province. Consequently, a large area of 3216 ha with S4A3 salinity/sodicity class in Khuzestan, Iran, was selected to obtain the required data. This experiment was conducted with two treatments and tree replicates. In the first treatment, the experiment was conducted by applying just 100 cm water depth in four 25 cm intervals. In the second treatment, 5000 kg/ha Sulfuric Acid was applied prior to salt leaching together with leaching water. The intermittent ponding method was conducted with double rings in a rectangular array. The required physical and chemical analyses were performed on the collected data. The leaching water was supplied from Shotait River. Four mathematical models were applied to the collected experimental data to derive a suitable empirical model. The results for large scale applications indicated that the proposed logarithmic model can estimate the capital leaching requirement much than the previously proposed models.

Effects of Biochar Application on Soil Organic Carbon in Degraded Saline-sodic Wetlands of Songnen Plain,Northeast China

Biochar amendment is considered as an efficient practice for improving carbon storage in soils.However,to what extent that biochar application promotes organic carbon in saline-sodic soils remains poorly understood.By comparing soil organic carbon(SOC)contents change before and after biochar addition,we deciphered the driving factors or processes that control SOC change in response to biochar application.A limited increase in SOC was observed,about by 1.16%-12.80%,even when biochar was applied at the rate of 10%of bulk soil weight.Biochar application enhanced soil dissolved organic carbon(DOC)significantly by up to 67%.It was estimated that about 50%SOC was allocated to small macroaggregates(250-2000μm,CPOC),and SOC in silt and clay-sized particles(<53μm)decreased obviously after biochar addition.Microbial biomass increased with biochar amendment,of which actinomycetes(ACT),fungus(FUN),protozoon(PRO),and bacteria with straight-chain saturated fatty acids(OB)increased remarkably.Multiple linear regression models implied that DOC was governed by ACT and soil N∶P ratio,while SOC mostly depended on CPOC.The principal component analysis and the partial least square path model(PLS-PM)indicated that biochar addition aggravated nitrogen limitation in saline-sodic soils,and effects of microorganisms on regulating SOC greatly depended on nitrogen bioavailability.Biochar application had vastly changed interactions between environmental factors and SOC in saline-sodic soils.Effects of nutrients on SOC shifted to great inhibition from strong stimulation after biochar addition,meanwhile,aggregation was the only factor presenting positive effects on SOC.How to eliminate nutrient limitation and better soil aggregation process should be considered in priority when biochar was used to improve SOC in saline-sodic soils.

Genesis and Behavior of Sodic Soils in Humid Climates

Sodic soils are typically located in semi-arid to arid climates. However, sodic soils in continental humid climates are rare. As with sodic soils in dry climates, sodic soils in wetlands pose management difficulties for agriculture, forestry, or wild-life habitat. The typical practice of gypsum application is problematic given inability to provide drainage. Natraqualfs located in southeastern Missouri present an acid argillic horizon superimposed on a natric horizon, where the exchangeable sodium percentage and an alkaline reaction are characteristic attributes. Ferrolysis is an active soil process that is slowly degrading the natric horizon because of exchangeable Al3+ and H+ generation and re-stabilization of the soil structure, permitting leaching of the sodium.

Biomass and bio-energy production of ten multipurpose tree species planted in sodic soils of indo-gangetic plains

Ten multipurpose tree species, Terminalia arjuna, Azadirechta indica, Prosopis juliflora, Pongamia pinnata, Casuarina equisetifolia, Prosopis alba, Acacia nilotica, Eucalyptus tereticornis, Pithecellobium dulce and Cassia siamea, were raised in a monoculture tree cropping system on the sodic soil of Gangetic alluvium in north India （26° 47° N： 80°46′ E） for 10 years to evaluate the biomass and bio-energy production. The soil was compact, sodic and impervious to water associated with nutrient deficiency or toxicity. Maximum plant height was recorded with E. tereticornis followed by C.equisetifolia and P. juliflora. A. nilotica performed better than the other species in terms of diameter at breast height （DBH） with a basal area of 13.04 m^2·ha^-1, followed by P. juliflora and C. equisetifolia. P. juliflora and A. nilotica produced nearly similar biomass of 56.50 and 50.75 Mg·ha^-1, respectively, at 10 years; whereas, A. indica, P. pinnata, C. siamea and P. alba did not perform well. P. juliflora scored maximum in net biomass production and nutrient demand. Nutrient （N, P, K, Ca, and Mg） concentrations were higher in leaf component of P. juliflora. However, in woody components, there was little variation between the species. N removal for production of one ton of wood was lowest in Acacia nilotica, P in T. arjuna, K in P. dulce and Ca and Mg in P. juliflora. P. juliflora gave the highest energy production of 1267.75 GJ.ha^-1 followed by A. nilotica with 1206 GJ.ha^-1 and the lowest ofA. indica （520.66 GJ.ha^-1）.

Response of Salt-Tolerant Rice Varieties to Biocompost Application in Sodic Soil of Eastern Uttar Pradesh

Sodic soils have immense productivity potential, if managed through proper technology interventions. Biocompost is prepared by composting pressmud (a sugar industry byproduct) received from cane juice filtration and spent wash received from distilleries through microbial aerobic decomposition and can be used to reclaim sodic soils. Field experiments were conducted during the wet season of 2011 and 2012 to study the effect of incorporation of biocompost in sodic soil with four treatments: T1—Control, T2—Biocompost at 2 t ha-1, T3—Biocompost at 4 t ha-1 and T4—Biocompost at 6 t ha-1. The two promising salt tolerant rice varieties preferred by farmers, Narendra usar 3 and NDR 359 were used as test crops, which can produce yields ranging between 2-4 t ha-1 in soil having a pH range of 9.2 to 10.5. Among the different doses of biocompost tested, application of biocompost at 6 t ha-1 registered highest yields, enabled by a higher biomass, ear bearing tiller (EBT), and grain fertility in both varieties. Narendra usar 3 was more responsive to treatments even at lower doses of biocompost than NDR 359, but NDR 359 yielded slightly higher than Narendra usar 3 in all treatments. Soil health was also improved evidently on better fertility and low soil pH and EC at harvest. Thus, biocompost can be considered as a commercially viable, environmentally acceptable and practically enforceable option for improving the crop productivity and soil fertility status.

Review of Sodic Soil Reclamation with a Snapshot of Current Research Activity

For centuries, reclamation of sodic soils has been an essential part of cropping practices in several parts of the world. Parallel to increasing population, the need for new cropland constantly re-evaluates land suitability concepts. Therefore, the importance of sodic soils as potential croplands is increasing worldwide. Although theoretically farmers can choose from a wide variety of reclamation options, according to profitability, business plans, and human and financial resources, in practice, few reclamation methods are applied at large scale. This article touches on the early history, 20th Century intensive research, and current trends of sodic soil reclamation. New approaches such as leaching, chemical amendments, addition of organic material, and biological and microbial improvements are discussed, and also brand-new approaches are reviewed. The early history is reviewed using historical books, the achievements of the last hundred years using basic technical literature, mostly books, and the current approaches of our time with fresh publications, mostly papers and two very recent conferences published in English.

Identification of Arbuscular mycorrhizal multiplicity in the saline-sodic soils

This study focused on the Arbuscular mycorrhizal(AM)fungal diversity in the saline-sodic soils based on native spore density and most probable number(MPN)assay.Identification through spore morphology showed existence of five genera in the various crop rhizospheres.The physico-chemical analysis of the native soils revealed that they were saline-sodic with pH ranging from(8.7±0.5)to(9.5±0.6)and habituated five different genera of AM fungi including Glomus,Scutellospora,Acaulospora,Sclerocystis and Gigaspora.Each location revealed presence of varied species of AM fungus namely Acaulospora and Glomus in rhizosphere of maize;Scutellospora and Glomus in tulsi;four isolates of Glomus in onion;Glomus and Sclerocystis in guava;three isolates of Glomus in rice;Glomus in neem and Gigaspora and Glomus in bamboo.The molecular identification through nested PCR analysis showed amplification of 600 bp size in SSU rDNA gene in samples A and C(predominated by Acaulospora and Glomus mosseae respectively).

Long-term cattle manure application to saline-sodic soil increases maize yield by decreasing key obstacle factors in the black soil region of Northeastern China

Poor soil physical properties, serious salinization and low soil nutrients are the limiting factors for crop yield in saline-sodic soil. Long-term cattle manure application is an important measure that can affect the physicochemical properties and increase the maize yield of saline-sodic soil. This experiment included five treatments according to the history of cattle manure application: a control treatment with no cattle manure (CK) and treatments with cattle manure application for 14 years (14 a), 17 years (17 a), 20 years (20 a), and 25 years (25 a). The results indicated that compared with the CK treatment, long-term cattle manure application to saline-sodic soil resulted in significant increases in soil organic matter (SOM), soil total nitrogen (TN) and available nutrients at the 0-20 cm and 20-40 cm depths (p<0.05). The soil physical properties improved significantly, and cattle manure application significantly decreased the soil bulk density (ρb) and soil density (ρd) and increased the soil total porosity (ft) and water-holding capacity (WHC). With the number of years of cattle manure application, the soil pH, electrical conductivity (EC), exchangeable sodium percentage (ESP) and sodium adsorption ratio (SAR1:5) decreased significantly, and the maize yield gradually increased over time from 8690 kg/hm2 in the CK treatment to 14 690 kg/hm2 in the 25a treatment. There were significant differences among all treatments (p<0.05). The results showed that long-term cattle manure application decreased the soil ρb and saline-alkaline properties, which was the main factor that affected the maize yield in the saline-sodic soil, especially for soil ρb.

水分胁迫下施用磷石膏改良滨海盐碱土对小麦生长影响与环境风险评估初探

在前期磷石膏改良效果试验的基础上,通过室内盆栽试验,采用滨海盐土种植小麦,磷石膏施用量45 000 kg/hm^(2),进行不同土壤持水量下水分与磷石膏的交互作用对小麦生长影响及环境风险试验,分别设置土壤饱和持水量的90%、80%、70%、60%、50%、40%、30%共7个处理。结果表明,含水量为土壤田间持水量的30%处理比持水量80%处理的小麦株高减少32.06%,总鲜生物量减少44.17%,根生物量增加106.06%,根冠比提高,小麦叶片抗氧化酶活性提高,丙二醛含量增加98.37%;土壤Cd增加3.2%,Pb增加7.2%,Cu增加50.9%,水溶性F增加150%;小麦叶片Cd增加50%,Pb增加33.3%,F增加275%。虽然尚未达到土壤和地下水重金属污染环境质量标准,但是如果长期连续高量施用磷石膏,会导致土壤和地下水相应有害物质积累;小麦叶片中的重金属在灌浆时会逐渐向籽粒转移积累,有一定风险。水分胁迫影响小麦生长发育,导致土壤及小麦叶片中Cd和水溶性F含量提高,会带来小麦籽粒残留Cd和F增加的风险。在气象干旱及盐碱地盐胁迫引起的生理干旱条件下施用磷石膏改良盐碱土可能会引起土壤及地下水环境风险和农产品安全风险,需要加强专项研究和应用监测。

苏打盐碱地稻米品质研究进展与展望

水稻是苏打盐碱地改良的先锋作物,稻米品质是水稻特征的重要指标。当前研究多关注盐碱地治理及水稻产量,有关盐碱胁迫下稻米品质的研究相对较少。本文从稻米的加工、外观、营养及感官食味品质4个方面系统梳理了苏打盐碱地条件下稻米品质特征,并总结苏打盐碱地水稻品种以及典型改良及栽培措施对稻米品质的影响。研究发现,苏打盐碱地条件下,稻米品质整体表现为较低的整精米率、精米率、糙米率及直链淀粉含量,较高的垩白粒率、垩白度及高蛋白质含量的特点,具有糙米蛋白含量高(更高的营养价值)、半透明颗粒少、淀粉低、钠等金属离子含量高等优点。研究提出未来需要进一步探讨苏打盐碱地条件下水稻品质形成、优异种质资源挖掘、产量与品质的协同提升,以期为苏打盐碱地水稻食味品质提升与特色品质的挖掘提供理论与实践参考。

长期不同施肥措施对盐碱地稻田土壤微生物数量和群落结构的影响

为阐明盐碱地稻田长期不同施肥对表层土壤微生物数量和群落结构的影响,以大安站盐碱地水稻长期定位施肥试验土壤为对象,采用磷脂脂肪酸(PLFA)分析法研究了单施氮肥(N)、无机肥配施(NPK)、有机肥单施(M)、有机肥与无机肥配施(MNPK)和秸秆还田配施无机肥(RNPK)对土壤微生物数量和群落结构的影响。结果表明:不同施肥处理土壤中共检测出57种PLFA生物标记,M、MNPK、RNPK和NPK处理的PLFA含量较N处理分别增加26.47%、29.76%、25.07%和13.20%,其中M、MNPK和RNPK处理显著高于N处理(P<0.05)。MNPK处理土壤中的真菌/细菌的比值最大,较二者之比最小的M处理高6.00%,说明有机肥配施化肥对盐碱地稻田土壤生态系统的稳定性具有更好的改善作用。RNPK处理土壤中革兰氏阳性菌与革兰氏阴性菌之比最小,较二者之比最大的M处理降低了13.71%,说明秸秆还田配施化肥处理的土壤营养胁迫小,能有效改善土壤的营养状况。不同施肥处理微生物群落多样性大小表现为N处理土壤的Shannon-Wiener多样性指数(H)、Pielou均匀度指数(J)和Simpson优势度指数(D)最大,分别较3项指数最小的NPK处理增加10.91%、12.00%和13.79%。冗余分析结果表明,盐分电导率(EC)、有机质和pH对土壤微生物群落变化具有显著影响,解释量分别为54.8%、39.8%和33.1%。因此,长期有机肥与化肥配施、有机肥单施和秸秆还田配施无机肥能有效增加土壤微生物生物量并优化微生物群落结构,进而改善土壤生态环境。

绿肥作物种植翻压对苏打盐碱土壤改良效果的影响

为筛选出适宜松嫩平原苏打盐碱地修复的绿肥作物,以松嫩平原西部苏打盐碱地为研究对象,于2022-2023年通过田间试验比较4种绿肥作物(田菁、草木樨、高丹草、‘朝牧1号’稗子)在苏打盐碱地的生长适应性,及其翻压后对土壤理化性质和土壤酶活性的影响,并对各指标进行相关性分析,旨在阐明不同绿肥作物种植翻压入土后对苏打盐碱土壤的改良效果和机理。结果表明:4种绿肥作物中,田菁的生物量干重和鲜重均为最高,在种植第二年产草量达30.35 t·hm^(-2),是其他绿肥作物的5~35倍;种植翻压第二年,田菁耕层土壤容重为1.17 g·cm^(-3),较裸地显著降低0.21 g·cm^(-3)、土壤pH显著降低0.15~0.50个单位、电导率显著降低32.22%~51.72%,其他绿肥作物0~20 cm土层土壤容重及pH与裸地无显著差异。在20~40 cm土层,‘朝牧1号’稗子和高丹草土壤电导率较裸地分别显著降低40.00%和31.11%,种植翻压田菁的土壤全氮、全磷、全钾和有机质含量高于其他绿肥处理;在0~20 cm土层,土壤养分提升33.98%~189.75%,种植翻压4种绿肥对耕层土壤酶活性的提升能力存在差异,其中田菁土壤酶活性提升表现优异,其土壤脲酶活性、土壤碱性磷酸酶活性、土壤蔗糖酶活性、土壤β-木糖苷酶活性分别较对照处理显著提高685.95%、80.78%、63.42%、19.10%(P<0.05)。综上所述,种植翻压田菁更有利于苏打盐碱地降碱培肥及土壤酶活性的提升。

苏打盐碱土壤黏粒分散特征研究进展

本文系统总结了黏粒分散特征表征方法,归纳可用于表征黏粒分散程度的主要指标;概述了黏粒分散对土壤物理性质的影响;重点阐述影响黏粒分散的因素,包括:土壤酸碱性、离子浓度、土壤有机质、农业管理措施、外源物质施用等;提出了黏粒分散控制方法。根据Na^(+)、K^(+)、Ca^(2+)和Mg^(2+)不同分散和絮凝能力得出,离子性指数、电荷稀疏性、净分散量、土壤结构稳定性的阳离子比和阳离子交换量等是表征黏粒分散特征的常用指标;电动电位势和浊度与黏粒分散存在密切联系,有待进一步应用于苏打盐碱土壤黏粒分散研究。黏粒分散破坏土壤结构,导致土壤水力传导率下降,严重阻碍土壤正常功能。黏粒分散机理:不同阳离子价态不同和不同土壤溶液浓度不同导致黏粒表面正电荷层厚度不同,引起黏粒之间范德华吸引力和静电排斥力作用效果差异,正电荷层较厚导致黏粒分散。通过明晰黏粒分散机理,有助于掌握影响黏粒分散的主要因素,抑制苏打盐碱土壤黏粒分散,改善土壤结构,以期为苏打盐碱土治理提供理论参考和技术指导。

不同种稻年限苏打盐碱土剖面性状及有机碳分布特征

以不同种稻年限苏打盐碱土为研究对象,开展种稻年限对苏打盐碱土剖面形态及有机碳分布和稳定性的影响研究。通过田间试验,以未开垦盐碱地、分别种植水稻1年、5年、10年、15年、20年、40年的苏打盐碱土为研究对象,对其剖面性状、pH值、微团聚体含量及微团聚体中有机碳分布特征、易氧化有机碳含量等指标进行测定并分析。结果表明:与未开垦盐碱地相比,种稻后苏打盐碱土耕作层的颜色暗度随年限增加而加深,各剖面土壤大多呈粒状和棱柱状,土壤的结持性均变疏松。未开垦盐碱地与种稻后苏打盐碱土的碳酸盐含量均较高,各剖面中石灰反应程度不同。种稻后,苏打盐碱土各土层的pH值均有不同程度的降低。在土壤微团聚体中,0.05—0.25 mm的大微团聚体含量最高,种稻使该粒级团聚体分解成<0.05mm的小微团聚体。种稻1—5年,小微团聚体有机碳含量有所增加;种稻10—40年,有机碳富集在大微团聚体中。种稻后,土壤各层次易氧化有机碳含量逐年增加,氧化稳定系数值均低于未开垦盐碱地的。耕作层、亚表层及渗育层中氧化稳定系数分别在种稻40年、种稻15年、及种稻10年达到最小值。总之,长期种稻不仅改良了苏打盐碱土结构,降低其pH值及有机碳的稳定性,还使土壤小微团聚体含量及大微团聚体有机碳含量增加。

2017-2021年吉林大安农田生态系统国家野外科学观测研究站气象数据集

气象数据可以提供准确的天气预警,同时对农业生产有着重要意义。吉林大安农田生态系统国家野外科学观测研究站地处松嫩平原西部,属中温带大陆性季风气候,全年光照充足,雨热同期,有利于农作物生长。但该区大面积分布的盐碱土严重影响了农业发展和生态安全。本数据集利用大安站气象观测场的原始数据,经过数据处理和质量控制,以时尺度、日尺度和月尺度将2017-2021年的气象观测数据汇编成集,内容包括气温、气压、相对湿度、风速、降雨、土壤温度(0-20 cm)、总辐射、反射辐射、光合有效辐射、土壤热通量和日照时数,旨在为研究东北苏打盐碱土,发展盐碱地特色生态农业,保障粮食安全和生态安全提供基础数据,为我国盐碱荒漠化治理与盐碱地综合利用等提供数据支撑。

施加脱硫石膏对盐碱土改良和固碳的影响

【目的】探究脱硫石膏施用对盐碱土改良效果和固碳作用。【方法】以新疆塔里木河流域下游荒漠盐碱土为研究对象,分析脱硫石膏不同施用量(0、10、20、30、40、50 t/hm^(2))对土层厚度为0~40 cm的土壤理化性质及土壤固碳的影响。【结果】与对照组相比,施用脱硫石膏显著降低0~20 cm土层土壤pH,增加土壤盐分含量;施用脱硫石膏量为40 t/hm^(2)的土壤有机碳储量达到最高,比对照组增加0.029 kg/m^(2);与对照组相比,脱硫石膏施用量分别为10、40 t/hm^(2)时,处理土壤的无机碳储量分别增加0.21、0.18 kg/m^(2);从改良时间来看,施用脱硫石膏改良土壤固碳效应的持续时间为0~7 d,其中施用量为40 t/hm^(2)时的效果最好;土壤碳储量受土壤pH、土壤盐分、降水量和蒸散发的影响较大。【结论】从盐碱土的改良效果及固碳作用来看,脱硫石膏施用量为40 t/hm^(2)时能显著降低土壤pH,且过程中具有显著的固碳作用。

Carbon stock estimation in halophytic wooded savannas of Uruguay:An ecosystem approach

Savannas constitute a mixture of trees and shrub patches with a more continuous herbaceous understory.The contribution of this biome to the soil organic carbon(SOC)and above-ground biomass(AGB)carbon(C)stock globally is significant.However,they are frequently subjected to land use changes,promoting increases in CO_(2) emissions.In Uruguay,subtropical wooded savannas cover around 100,000 ha,of which approximately 28%is circumscribed to sodic soils(i.e.,subtropical halophytic wooded savannas).Nevertheless,there is little background about the contribution of each ecosystem component to the C stock as well as site-specific allometric equations.The study was conducted in 5 ha of subtropical halophytic wooded savannas of the national protected area Esteros y Algarrobales del Rio Uruguay.This work aimed to estimate the contribution of the main ecosystem components(e.g.,soil,trees,shrubs,and herbaceous plants)to the C stock.Site-specific allometric equations for the most frequent tree species and shrub genus were fitted based on basal diameter(BD)and total height(H).The fitted equations accounted for between 77%and 98%of the aerial biomass variance of Netuma affinis and Vachellia caven.For shrubs(Baccharis sp.),the adjusted equation accounted for 86%of total aerial biomass.C stock for the entire system was 116.71±11.07 Mg·ha^(-1),of which 90.7%was allocated in the soil,8.3%in the trees,0.8%in the herbaceous plants,and 0.2%in the shrubs.These results highlight the importance of subtropical halophytic wooded savannas as C sinks and their relevance in the mitigation of global warming under a climate change scenario.

水分调控对盐碱地土壤盐分与养分含量及分布的影响

为给新疆地区盐碱地开发利用提供合理的灌溉指导，该文研究了滴灌条件下内陆干旱区重度盐碱地水分调控对土壤盐分与养分的影响，2008-2010年连续3 a设置了滴头正下方20 cm处5个土壤基质势下限控制灌溉：-5 kPa（S1）、-10 kPa（S2）、-15 kPa（S3）、-20 kPa（S4）和-25 kPa（S5），每个处理重复3次，按随机区组布置，于2008年试验前和2008-2010年试验后采集土壤样品（0～5、5～10、10～20、20～30和30～40 cm），测定土壤盐分（电导率、钠吸附比）以及土壤养分（速效N、P、K，全N、全P，有机质）含量。结果表明：3 a试验结束后，各处理0～40 cm土层土壤电导率与钠吸附比均显著（p＜0.05）降低，其中-5 kPa（S1）处理土壤电导率降至5.3 dS/m，降低幅度最大，为89%；速效N、P、K，全N、全P以及有机质含量较试验前均有显著升高，升高幅度均在20%以上，且与土壤基质势下限成正比。各处理速效养分均在滴头周围形成累积区，且随与滴头距离的增加而减少，养分全量与有机质含量在土壤剖面垂直分布差异显著。各处理土壤C/N均较第1年播种前降低，且降低率（4.3%～13.5%）随土壤基质势下限的降低而升高。综合土壤盐分的淋洗效果以及土壤养分的改良程度，滴头正下方20 cm处土壤水基质势控制下限-5 kPa可以作为内陆干旱区前3 a盐碱地水分调控的指导灌溉制度。