Results 81 to 90 of about 27,519 (160)
, 2014 The Universal Soil Loss Equation (USLE) is presently one of the most widely used models for evaluating soil erosion. The rainfall amount is often used to estimate the R factor for Universal Soil Loss Equation (USLE) modeling.
Huan-Hsuan Lin +5 more
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Shuitu Baochi Xuebao, 2008 研究了刺槐、绒毛白蜡纯林及其混交林中不同土层在不同季节的土壤养分含量、土壤酶活性的变化。结果表明:各林分间的土壤养分含量和土壤酶活性在各个季节和土层均表现出差异。经统计分析,土壤酶活性和土壤养分含量在不同季节呈显著相关关系。土壤酶活性和土壤养分含量在土层中的分布有一定的规律性,总的来说,随着土层逐渐加深,土壤酶活性逐渐减弱,土壤养分含量逐渐下降。混交林中各土层的pH值和含盐量都低于纯林相应值,并且在树木生长、土壤养分和土壤酶活性上,混交林优于纯林。
曹帮华, 吴丽云
doaj
[Determination of polychlorinated naphthalenes in soil using accelerated solvent extraction-molecular sieves solid-phase extraction coupled with gas chromatography-tandem mass spectrometry]. [PDF]
Se Pu, 2022 Jin J +6 more
europepmc +1 more source
, 2014 四川冬水田的发展史大致可分为清代的兴起与扩展,民国的继承与发展,新中国的改造与缩减三大阶段。水稻种植规模的大小、劳动生产率的高低、水利设施的多少均是影响冬水田发展的因素之一。以往提高农业产出的是改造冬水田的动因;现今提倡恢复冬水田又是出于其水利、生态湿地价值的考虑。冬水田作为一项大规模的水利工程,其之于四川农业 ...
陈桂权
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Shuitu Baochi Xuebao, 2008 采用定位取样与烘干法,测定了榆林沙区几个树种土壤含水量。结果表明:各树种土壤含水量变化规律为:樟子松>柠条>紫穗槐>沙柳>沙蒿>花棒-踏郎;土壤含水量的垂直分布格局为表层土壤含水量最低,随着土壤深度的增加,土壤含水量呈增加趋势;土壤含水量的季节动态规律为不同树种土壤含水量具有明显的季节变化规律,土壤含水量按季节变化可分为3个阶段,4-5月的土壤水分弱失水阶段,6-8月的土壤水分消耗阶段,9-10月的土壤水分缓慢恢复阶段。
尚爱军 +4 more
doaj
[Determination of organophosphate diesters in facility vegetable soils using ultra-high performance liquid chromatography-electrostatic field orbitrap high resolution mass spectrometry]. [PDF]
Se Pu, 2023 Liu M +7 more
europepmc +1 more source
Shuitu Baochi Xuebao, 2006 由于道路建设，原有土壤被扰动，形成了一种新的人为土-路域土壤。文章对路域土壤的成因和特点进行了阐述，并以呼集高速公路卓资段的实例来说明路域土壤的特点。研究分析了路域土壤的理化特性，土壤污染特征。结果表明：路域土壤形成过程中，土壤的粉沙粘粒含量、有机质和养分含量趋于下降、pH值趋于升高；土壤理化性质的恶化是土壤粉沙粘粒和有机质被道路建设所影响的结果，进而造成土壤粗粒化，并且路域内部有潜在土壤污染的可能．
余海龙 +4 more
doaj +2 more sources
Shuitu Baochi Xuebao, 2004 针对红壤坡地水土流失严重的状况,选用横峰野葛、百喜草为材料对红壤坡地水土保持和土壤改良进行了研究。结果表明:横峰野葛和百喜草能有效地提高土壤持水量,降低土壤容重,增大土壤孔隙度,提高土壤PH值,增加土壤有机质和N、P、K含量,大大减少土壤侵蚀量和径流量,达到了较好的水土保持和改良土壤效果,而且野葛的综合效果比百喜草更好。
范淑英 吴才君
doaj +2 more sources
[Rapid and simultaneous determination of glyphosate, glufosinate, and their metabolites in soil by high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se Pu, 2022 Ping H +6 more
europepmc +1 more source
利用滲透試驗探討雙層土壤之滲流沖蝕行為及其數值模擬 [PDF]
, 2014 Seepage erosion occurs when finer particles are dragged out from other soil particles by water. This type of erosion causes progressive failure inward into the slopes and slope instabilities.
Ming-Lang Lin +3 more
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