因而如何合理有效地利用土壤水资源就成为保证农作物和林草植被生理需水、改善生态环境的关键。
Therefore how to utilize soil water resource rationally and effectively become the keys to guarantee physiological water requirements of vegetation and improve eco-environment.
黄土高原地区是典型的水资源贫乏区，干旱是制约林草生长的主要因素。
The loess plateau region is a typical water scarce area and the drought is the main factor that restricts the growth of the forest and grass.
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