, 2008 通过对白杨河—艾里克湖湿地土壤理化性状的研究,包括土壤颗粒组成、水分含量、盐分、pH值和养分等的空间分布特征。结果表明:大范围分布的土壤主要由细砂和粉砂组成,少数由粗砂粒组成;土壤水分的空间分布特征反映了白杨河河谷沿线局部干旱的现象;在艾里克湖周边发育着盐土和盐渍化土,对植物生长发育有明显的胁迫作用;土壤有机质、全N和全P总体贫乏,全K含量较高,并且有机质和水分的相关性较好,不同植被下土壤有机质含量和含水量的相关系数也不尽相同 ...
闫培锋, 刘宏霞, 周华荣
core
, 2010 本书共分11章。第1章主要介绍土石混合介质中水分运动的研究背景、研究意义及相关研究进展；第2章主要介绍研究区概况、土壤中钙结石的形成原因及空间分布；第3章主要涉及含钙结石土石混合介质中的钙结石和细土的物理特性、二者含水量之间的关系及总含水量测定的误差分析；第4章主要介绍土壤水分特征曲线和饱和导水率的测定及碎石对其的影响；第5章主要包括单孔模型、双孔模型、双透模型、定解条件以及模型的数值解；第6章主要分析室内条件下土壤中碎石的含量、大小及类型对人渗的影响 ...
朱无骏 +4 more
core
, 2007 地形条件是影响黄土高原地区土壤性质分布的主要因素,研究不同地形条件下土壤性质的分布是合理评价黄土区土壤质量状况的重要前提。论文研究了黄土高原沟壑区小流域地形条件对土壤性质剖面分布的影响,结果表明土壤硝态氮、速效磷、碱性磷酸酶和蔗糖酶为高度变异的土壤性质;pH值和过氧化氢酶为小变异土壤性质。塬面和沟道土壤pH值和过氧化氢酶活性较低,阳离子交换量较高。土壤有机质、全氮、全磷、速效磷、碱性磷酸酶和蔗糖酶活性在土壤剖面随土层深度的增加逐渐降低,且均表现为塬面>梯田>坡地>沟道的趋势 ...
魏孝荣, 邵明安
core
[Determination of 22 organophosphates and their metabolites and 11 phthalate metabolites in human whole blood by ultra performance liquid chromatography-tandem mass spectrometry]. [PDF]
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