The key factors causing soil dried layers are great thickness and depth of membrane water zone under ground as well as small thickness of gravity water zone.
由降水少量决定的、埋藏深度小而厚度大的薄膜水带的存在是引起土壤干层发育的直接作用的因素。
Soil total organic carbon was negatively correlated with depth of soil, is not significant difference among soil layers in NTS.
NTS的土壤全碳含量与土层深度显著负相关，各土层间的全碳含量差异不显著。
With the massive groundwater pumped for irrigation, there was an apparent decrease of groundwater depth and desalinization in soil layers that led to a substantial increase of crop production.
井灌井排技术有效地降低了地下水位，土壤明显脱盐，作物产量不断提高。
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