Results 81 to 90 of about 2,392 (152)
Effects of PBAT on Soil Water and Salt in Maize Root Zone and Maize Yield in Saline-alkali Land [PDF]
[Objective] In order to reduce soil pollution caused by plastic film, the application effect of using PBAT fully biodegradable plastic film instead of ordinary PE plastic film combined with drip irrigation to grow maize in mild secondary salinized soil ...
HOU Jiana +6 more
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Some Impacts of Egret Colonies on the Heronry Soils Nutrition and Heavy Metal level [PDF]
, 2009 对厦门白鹭自然保护区鸡屿岛上的鹭类集群营巢地的表层土壤进行测定，比较繁殖前营巢地、繁殖后的营巢地及非营巢地土壤当中的营养元素全氮(N)、全磷(P)、全钾(K)的含量，以及重金属元素铜(Cu)、锌(Zn)、铬(Cr)、镉(Cd)的含量.土壤样品用微波消化法消化，土壤氮用凯氏定氮法测定，土壤磷用钼蓝比色法测定，土壤钾、铜、锌、镉、铬用原子吸收法测定。实验测得，繁殖前营巢地土壤全氮百分含量为0.038±0.006；全磷百分含量为0.086±0.015；全钾百分含量为1.049±0.048 ...
李伟
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Shuitu Baochi Xuebao, 2004 在杏园进行覆草对土壤肥力和杏产量与品质的影响研究表明：覆草能有效地稳定土壤温度，保持和提高土壤水分；降低土壤容重，增加土壤总孔隙度和通气孔度．减少无效孔度；增加土壤有机质和养分含量，改善果树营养，提高杏产量和品质。
刘建新
doaj +2 more sources
Research on soil improvement and engineering application under mixed application of environmental materials in alpine mining areas [PDF]
To address the issues of inadequate topsoil structure, soil erosion, and low soil fertility in the reclamation of alpine mining areas. Taking Qinghai West Copper Mine as an example, this study investigates the impact of three materials—sheep manure(A ...
Jie REN +4 more
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Shuitu Baochi Xuebao, 2019 通过田间小区试验，分析了不同用量的生物炭处理下（0，10，20，30，40 t/hm2）0—17，17—29 cm土层土壤的理化性质、重金属钝化及酶活性的影响。采用IFI（土壤肥力综合质量指数）评价了土壤肥力状况。结果表明：施用生物炭可以改善红壤的理化性状，降低土壤容重，提高土壤的孔隙度、饱和含水量、pH、CEC、有机质、有效磷、铵态氮和全氮及DOC含量）同时提高土壤脲酶、过氧化氢酶和蔗糖酶活性。土壤有效态Cd和Pb含量均随生物炭施用量的增加而减少）而有效态As含量则随生物炭施用量的增加呈先增后减的趋势，
郭碧林 +4 more
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Extracellular Enzyme Stoichiometric Characteristics of Subtropical Forest Soil under Forest Fire Disturbance [PDF]
[Objective] Forest fire, as the primary natural and human-induced disturbance in subtropical forests, seriously affects the soil biochemical cycle.
GUO Qiling +5 more
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, 2018 结合坡面微地形变化,从土壤微生物群落多样性角度研究典型缓丘区不同坡位上土壤微生物群落特征,了解微地形生境下土壤微生物群落变化趋势.研究结果表明,土壤微生物群落培养的平均颜色变化率(AWCD)增长曲线呈现中坡位>坡顶>下坡位>上坡位>坡底的规律,中坡位土壤微生物群落代谢活性最高,坡底土壤微生物群落对基质的利用能力最低;在土壤微生物多样性指数比较中发现,除McIntosh均一度指数变化不显著外,其余土壤微生物多样性指数在不同坡位上存在显著差异.其中 ...
杜勇 +4 more
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The Terraced Walls Significantly Influence the Spatial Distribution of Soil Water in Terraced Areas on the Loess Plateau [PDF]
[Objective] Converting slopes into terraces is a crucial soil and water conservation and agricultural measure on the Loess Plateau. Understanding the impact of terraced walls on soil water is conducive to preserving soil water and enhancing terrace ...
BAI Chenyun +5 more
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Shuitu Baochi Xuebao, 2011 快速准确获取表层土壤水分是土壤学、生态学及相关学科研究的基础.该研究在室内条件下,研究了5种不同土壤表面灰度值与含水量之间的关系,以期为利用土壤表面灰度值反演表层土壤含水量建立试验基础.研究结果表明:土壤在烘干过程中,含水量的变化受孔隙结构的影响;对于不同类型的土壤,土壤表面灰度值受矿物质组成和有机质含量的影响,随着土壤有机质含量的增加,同一含水量下的土壤表面灰度值降低;土壤表面灰度值与表层土壤含水量呈指数负相关关系.
毛天旭, 朱元骏, 邵明安
doaj
Shuitu Baochi Xuebao, 2017 为了解垦殖对川西北高寒天然草地土壤理化性质的影响，采用空间代替时间的方法，选择高寒草地垦殖年限为3 a和10 a的蔬菜地作为研究对象，以未开垦的天然草地作为对照，研究了不同垦殖年限下0—60 cm土层土壤理化性质的变化特征。结果表明：人为垦殖导致天然高寒草地土壤养分含量和土壤理化性质显著下降，且随着垦殖年限的增加土壤质量进一步降低。垦殖10 a后，0—60 cm土层土壤容重、砂粒含量分别增加了21.1%和8.0%（p＜0.05），土壤含水量、有机质、全氮、速效氮、粘粒含量分别下降了38.4%，44.1%，
杨泽鹏 +6 more
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