河套灌区两类农田防护林防护效益对比研究

以灌区农田防护林为研究对象,对灌区2种杨树2种主林带间距防护林内小气候效应进行了研究。结果表明,在200m间距内,新疆杨最大降低风速39.35%,最低降低风速23.10%,平均降低风速33.58%;小美旱杨最大降低风速40.68%,最低降低风速31.92%,平均降低风速36.09%。经方差分析,2种杨树在200m间距内防风效益差异显著,小美旱杨优于新疆杨。从水文效应、热力效应方面分析,无论新疆杨还是小美旱杨,100m主林带间距和200m间距对水文效应和热力效应影响不显著。综合考虑,小美旱杨防护林优于新疆杨防护林,200m间距优于100m间距。

Study on Benefits of Two Kinds of Poplars and Distance of Farmland Protective Forest in the Hetao Area

The study on the protective effect of farmland protective forest was conducted.The result shows that with the condition of 100m and 200m's distance space of sheltbelts,the distinction about two kinds of distance space of sheltbelts on P.alba var.pyramidalis temperature and water effect is not notably different,but it is notably different in windbreak effect aspect;the distinction about two kinds of distance space of sheltbelts on P.Popularis' protective effect is not notably different;on the condition of 200m distance space of sheltbelts,P.Popularis' sheleter forest protective effect is superior to P.alba var.pyramidalis sheleter forest.Based on the analytic hierarchy process,the result of comprehensive benefit evaluation indicates that P.Popularis' sheleter forest is superior to P.alba var.pyramidalis sheleter forest and 200m's distance space of sheltbelts is superior to100m's.