摘要
对杨粮间作条件下小麦生长结果研究表明,杨树间作行距与土壤水分呈反比关系,即3～15m的行距范围内林木行距每扩大1m,土壤季平均含水量则降低1.0％,证明间作可有效减少土壤水分损失;同时林木行距与小麦叶绿素含量呈反比,说明一定程度的林木遮荫可提高小麦叶绿素含量。试验表明,小麦光合作用速率和蒸腾速率与林木行距呈正比,林木行距每增加1m,小麦的光合速率和蒸腾速率分别提高1.3μmol/m^2·s和0.2μmol/m^2·s,说明林木行距过小,则影响作物的光合作用,进而影响小麦的生物量和产量。通过计算,在该杨树4年林龄条件下小麦取得最大产量的行距为21～22m。
The soil water content under intercropping land has inverse ratio to poplar space between rows(SBRs), i.e.it decrease 1.0% by adding 1m SBRs within 3-15m space bound, which shows that the intercropping could reduce water loss from soil to atmosphere. The wheat leaf chlorophyll content has the same relation with the SBRs, which indicates poplar shading on wheat can increase leaf chlorophyll content. The study, on the other hand, demonstrates that wheat photosynthesis rate and transpiration rate have direct ratio to SBRs, and they in-crease 1.3μmol/m2·s and 0.2μtmol/m2·s by widening 1m space, respectively. The over small SBRs will lead photosynthesis rate to decrease, and to affect the wheat biomass and yield. The SBRs, in which the wheat could get the highest yield by equation forecast under 4 years old poplar stand, is 21-22m.
出处
《中国生态农业学报》
CAS
CSCD
2001年第2期88-91,共4页
Chinese Journal of Eco-Agriculture
基金
河北省自然科学基金(393033)
河北省林业厅重点资助项目(9516102)部分研究内容
