shortage of soil moisture meaning in Chinese

土壤水分不足

Based on the serious shortage of soil moisture , soil aridity and vegetation recession in this region , the following issues are studied in this dissertation : ( 1 ) the meaning of soil water and its role in the water circulation ; ( 2 ) soil water deficit and its influence to vegetation growth ; ( 3 ) the definition of soil dried layer and the causes of its formation ; ( 4 ) soil dried layer distribution and characteristics in north of shaanxi loess plateau ; ( 5 ) the primary study of measurable index of soil dried layer
本论文主要针对黄土高原土壤水分严重亏缺现状以及因之而形成的土壤干化和林草植被衰退现象，主要对以下几方面的问题进行了研究： ( 1 )土壤水分的意义及其在生态系统水分循环过程中的作用； ( 2 )林草植被土壤水分亏缺状况及其对植被生长的影响； ( 3 )土壤干层的涵义及成因分析； ( 4 )陕北黄土高原土壤干层的分布及特征； ( 5 )土壤干层的量化指标初步研究。