半干旱区植被风沙动力过程耦合研究: Ⅲ. 应用

 以科尔沁地区的奈曼旗为例对植被-风沙动力耦合模型进行实际应用，模拟10余年来生物量和风蚀量的分布变化，并与遥感数据进行对比。对奈曼地区1987年至2002年土壤水分补给量、生物量和风蚀量的模拟结果表明：土壤水分补给量与降水量有较明显的相关性，通常春夏土壤水分补给量较高、秋冬季较低。土壤水分补给量与降水量在空间分布上较为一致，地势低洼处比周边地区高。生物量的季节变化规律主要表现为夏季最高;秋季若雨水充足可形成一个次高峰,若降雨量较小则生物量迅速下降;冬季和初春生物量最低。生物量的空间分布格局为南部、地势低洼以及离河流较近的区域生物量较高。风蚀量的季节变化规律表现为初春季最高，夏季最低，秋季逐步上升，上升的速度视生物量情况而变化，冬季较稳定。风蚀量的空间分布格局是北部平原地区和植被覆盖较低的地区风蚀量较高。

Vegetation-Erosion Process in Semiarid Region:Ⅲ.Application

A vegetation and wind-sand coupling model was applied to simulate soil water replenishment, biomass and wind erosion in Naiman County from 1987 to 2002. The simulation shows that soil water replenishment has an obvious correlation with precipitation. Water replenishment is higher in Spring and Summer and lower in Autumn and Winter. Biomass has the highest value in Summer and may remain at a rather high level if with an adequate precipitation in Autumn, or falls quickly if without adequate precipitation. The value of biomass in Winter and early Spring is relative low. The larger biomass appears in the south and lower regions and around the river. Wind erosion is higher in early Spring and lower in Summer and increases in Autumn and remains steady in Winter. The higher wind erosion appears on northern plain land and in areas with lower vegetation coverage.