摘要
本文应用灰色聚类法,在对农田林网的各个不同位置进行各气象要素考察的基础上,选用风速降低率、气温日振幅、蒸发、相对湿度、辐射差额、蒸发耗热6个因子作为聚类指标,评价农田防护林生态气候效益。得出结论,在林网的背风面,距林网1H(H为平均树高),5H,10H,20H内防护效益都较好,而以5H为最好,10H次之,1H略差。
The meteorological factors in the different positions of farm protecting forest were examined with the method of grey aggregation. The ecological climatic benefit of farm protecting forest was evaluated in accordance with 6 indices: wind speed decreasing tate; raddiation diffe- rence; evaporation; relative humidity; temperature amplitude in a day; heat cosumption for evaporation. The conclusion was that,at the lee- ward of forest, the protection result was better at the points 1H(H= tree height),5H,10H, 20H near the forest,and the 5H was the best,10H the next,1H rather bad.
出处
《沈阳农业大学学报》
CAS
CSCD
1992年第Z05期76-80,共5页
Journal of Shenyang Agricultural University
关键词
灰色聚类法
农田防护林
灰色系统
grey aggregation
evaluation
Farm protection forest
ecological climatic benefit
