摘要
试验研究华北平原农区杨粮间作系统毛白杨对农田遮荫结果表明,毛白杨幼林(株行距3m×2m×18m)1～7年生遮荫指数为1.3％～67.8％,遮荫程度为0.3％～16.5％。中龄林-成林(株行距4m×30m)10～14年生遮荫指数为51.3％～76.0％,遮荫程度为22.8％～28.1％,指出10％的遮荫程度是田间可接受的最大遮荫程度,且为保持作物产量,杨树成林后行距应保持在30m以上。
The poplar (Populus tomentosa Carr.) shading on farm field is reported under poplar-crop intercropping system in Northern China farm region.The results show that the young poplar with a space of 3m*×2m×18m brings a shading index of 1.3 % ~ 67.8 % and a shading degree of 0.3%~16.5% on farm field when the stand ages are 1 ~ 7 years,and middle-mature poplar with a space of 4m×30m results in a shading index of 51.3 % ~ 76.0 % and a shading degree of 22.8 % ~ 28.1 % when the stand ages 10-14 years as well.The study shows that the shading degree of 10 % is the maximum shading degree that can be accepted in farm field,and the trees with a space of 30m between rows can keep the crop yield steady when poplar is entering mature stage.
出处
《中国生态农业学报》
CAS
CSCD
2003年第2期107-110,共4页
Chinese Journal of Eco-Agriculture
基金
河北省自然科学基金"杨粮间作的生理生态学基础研究"
河北省林业厅项目"河北省平原农区混农速生丰产林生态系统结构
功能和经济效益的研究(9516102)
关键词
农林间作系统
林木遮荫
产量
遮荫程度
遮荫指数
毛白杨
Poplar-crop intercropping,Shading degree,Shading index,Populus tomentosa Carr.,Crop yield
