杨粮间作系统中林木遮荫作用研究  

THE STUDY ON SHADING EFFECT UNDER POPLAR CROP INTERCROPPING SYSTEM

作　　者：袁玉欣[1] 王颖[1] 裴保华[1] 王德艺[1] 贾玉彬[1] 

机构地区：[1]河北农业大学林学院,保定071000

出　　处：《林业科学》2002年第1期36-43,共8页Scientia Silvae Sinicae

基　　金：河北省自然基金资助项目<杨粮间作的生理生态学基础研究>;河北省林业厅资助课题<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> 课题编号 :95 1610 2。

摘　　要：本文报道了利用遮荫指数和遮荫程度 ,描述华北平原农区杨粮间作系统毛白杨对农田的遮荫情况。结果说明 ,毛白杨幼林 (株行距 3m× 2m× 18m) 1～ 7a生的遮荫指数为 1 3%～ 6 7 8% ,遮荫程度是 0 3%～16 5 % ;中龄林—成林 (株行距 4m× 30m) 10～ 14a生的遮荫指数是 5 1 3%～ 76 0 % ,遮荫程度为 2 2 8%～2 8 1%。利用遮荫程度表示林木对农田的遮荫情况比用遮荫指数更符合实际 ,并且提出 15The poplar(\%Populus tomentosa\% Carr.) shading on farm field, with shading index and shading degree, was reported under poplar crop intercropping system in Northern China farm region. The results demonstrate that poplar young growth (spacing 3?m×2?m×18?m) brought on shading index 1 3%～67 8% and shading degree 0 3%～16 5% on farm field when stand ages were 1～7 years, and near and mature stand (spacing 4?m×30?m) resulted in shading index 51 3%～76 0% and shading degree 22 8%～28 1% when stand 10～14 years as well. But using shading degree to express shading on farm field is better than shading index, and shading degree 15% is suggested the maximum shading degree that could be accepted in farm field.

关 键 词：杨粮间作系统 遮荫程度 遮荫指数 毛白杨 平原混农林业 

分 类 号：S344.2[农业科学—作物栽培与耕作技术]