It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
Based on the investigation of rural social economy in typical watershed with oil exploiting in loess hilly-gully region, the effect of oil exploitation on social economy was analyzed.
文章基于黄土丘陵区油田开发典型流域社会经济调查，探讨了石油开发对当地农村社会经济的影响。
To improve and optimize land use pattern and structure is one of the most effective ways to the control of human-accelerated erosion in the hilly-gully loess region.
改善和优化土地利用方式和结构是综合治理黄土高原人为加速侵蚀的关键。
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