摘要
对安庆江滩不同林龄杨树人工林内的日总辐射、气温、湿度、地温等小气候因子和间作物产量进行调查 ,研究林龄和这些因子之间的变化规律。应用灰色关联分析得出 ,4个小气候因子中 ,日总辐射是影响间作物油菜产量的关键因子。林龄和产量之间的分析结果显示 ,林龄对间作物产量影响极为显著 ,随林龄增加 ,间作物产量以每年 1 2 9kg/ hm2大幅度下降 ,间作年限最多 6年。建议 6年生以上林分采取适当间伐或间种耐荫经济作物等调控措施 ,保证持续间种 。
The microclimatic factors (daily total radiation,air temperature,air humidity,soil temperature,etc.) and the yield of intercrop in different aged poplar plantation were investigated and analyzed.Through grey relationship analysis,the result showed that daily total radiation was the key factor which affected the yield of intercrop.Analysis on relationship between forest age and intercrop yield concluded that the latter reduced 129 kg/hm 2·a with increase of the former,and that the fixed number of years of intercrop were six.It is suggested that some measures of regulation,like thinning etc.,should be taken to keep sustainable intercrop and achieving best comprehensive benefits for the forest of 6 years and over.
出处
《安徽农业大学学报》
CAS
CSCD
2000年第2期146-149,共4页
Journal of Anhui Agricultural University
基金
国家"九五"科技攻关项目资助
