黄土高原多沙粗沙区生态环境评价

以水土保持作用系数、降蒸差、初级生产力为评价因子，对黄土高原多沙粗沙区的生态环境现状进行了评价，并根据近40年气候变化的规律及国家气候中心GCM模型对未来50年气温、降水的预测结果，对未来该区生态状况进行了预评估。提出，要改变生态环境脆弱、生产水平低下、资源利用和潜力发挥受阻的局面，进行生态环境建设，实行农业结构调整，宜林则林、宜草则草、宜沙则沙，是十分有效的途径。

Evaluation of Ecological Environment in Plentiful and Coarse Sand Area in Loess Plateau

The present state of ecological environment is evaluated in the area of plentiful and coarse sand on the Loess Plateau in China with water and soil conservation effect coefficient, the difference between rainfall and evaporation and primary production capacity as the evaluation Factors. At the same time, based on regularity of climatic change for last 40 years, and the forecasting result of air temperature and rainfall for next 50 years with GCM Model of National Climatic Center, the future ecological condition in the zone is viewed. It put forward a proposal of ecological environment construction, adjusting agricultural structure: planting trees where to be good for growing trees, planting grass where to be good for growing grass and developing sand production where to be not good for growing plant. These proposals are effective ways to change the current condition on the frailty of ecological environment, lower production level, resources of unreasonable use and undeveloped potential production.