海涂农田林网防护效益研究

Studies on Protective Effectiveness of Forest Network in Shoal Farmland

对上虞市海涂实验农场农田林网防护效益的测定，结果表明通风结构审林带防风效能达到３１．０％左右；在八九月份高温干旱季节，林网内增加相对湿度约１．８％。林带背风而树高２～３倍地区为林带增产作用的显著范围，棉花产量比对照区增产１３．０％～３８．１％，除林缘等胁地外，受林带有利影响测试区棉花产量平均增产８．４％。

Determination on protective effectiveness of the forest network in farmland in theshoal experimental farm of Shangyu showed that, wind broken effectiveness of the forest beltwith narrow ventilating structure was up to 31. 0% or so. In high -- temperature and dry seasonsof Auguest and September, the relative humility in the forest network increased by 1. 8%. Inthe forest belts which were against wind and wide 2 -- 3 times as much as the height oftrees, yield of cotton increased by 13. 0% -- 38. 1%, as compared with the controls. In the testedarea affected by the forest beltS. yield of cotton increased by 8. 4% on average.