农林问间系统林木遮荫及其对产量的影响
The shading and its effect on crop yield under poplar-crop intercropping system
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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。Abstract: The poplar(Populus tomentosaCarr．)shading on farm field is reported under poplar-crop intercropping systam 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 wel1．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 stea dy when poplar is entering mature stage．
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Key words:
- Poplar-crop intercropping /
- Shading degree /
- Shading index /
- Populus tomentosa Carr． /
- Crop yield
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