小网格窄带疏透结构护田林带气象效应

The meteorological effect of the sparse and narrow forest belt with small network for farm protection

黑龙江省西部平原农业区在50年代初营造的单条宽带大网格护田林带气象效应,经过多年观测和研究证明已取得了很大成绩,但70年代后,在防护林体系规划、设计和建设上这种模式已被林、路、渠相结合的小网格窄带疏透结构的护田林模式所替代,后者经过10余年营造现已成林,基本实现了农田林网化。为给今后护田林规划设计提供科学依据,我们在防护林地区选择了完整的。

The author of this article has made meteo-observation to the sparse and narrow farm-protected forest with small network in the agro-area of west Heilongjiang. The observation area is.10—21 ha.s (5 main forest belts, 3 side forest belts). The meteorological effect is: the wind speed is decreased by 40—70%; the temperature reduces 0.3℃ in summer and goes up 0.6℃ in winter; the ground temperature drops 0.5℃, the relative air humidity is increased by 12.3% at 0.8m high in the forest net work, and the soil humidity at 5H is increased by 4% compared with the open area. The evaporation on the lee side of forest belts is decreased by 25.7—33.9% al most.