黄土高原水土保持世行贷款项目区局地气候变化初步分析

Preliminary Analysis on Local Climate Changes in the World Bank Loan Loess Plateau Rehabilitation Project Area

对黄土高原水土保持世界银行贷款项目实施前后的监测数据和有关气象资料进行分析表明 ,大规模林草、梯田等坡面措施和沟道坝库工程的实施 ,影响了当地小气候特性 ,较好地起到了调节温度、提高湿度、增加降水和雾日、减少冰雹等作用 ,项目区与参照站比较 ,相对湿度提高了 5～ 10个百分点 ,平均每年有雾日相对增加了 6 7d ,年降水量相对增加 5 %～ 10 %。

It is shown by the analysis of monitoring data and relative meteorological data before and after the implementation of the World Bank Loan Loess Plateau Rehabilitation Project that a large scale implementation of planting trees and grasses, terraces building and dams and reservoirs built in gullies have effected the property of local micro climate, played a positive role on temperature regulation, increasing humidity and days of precipitation and fog and hails reduction, relative humidity increased 5%～10%, 6.7 fogy days more each year in average and annual precipitation relatively increased 5%～10%.