论文部分内容阅读
为了解农林间作田林木遮光对小麦的影响，设计了人工遮光试验，研究在土壤和水肥相同的条件下，遮光与小麦生长发育和产量的关系。结果表明，透光率为57.3％的遮光处理，小麦物候期推迟2～4d;前期（5月4日前）单株分集数、绿叶面积和地上生物量等指标分别为对照的164.9％，177.9％和159.80。可见遮光促进了个体的生长。但从抽穗期开始，遮光处理因为叶面积指数过高（9.9），群体光照严重不足，春季分蘖和下部叶片大量死亡，最终导致地上生物量仅为对照的90％，籽粒产量比对照降低11.0％，千粒重降低9.4％。由此可见，在农林长期间作中，应保证小麦获得50％～60％的相对光强，才不致严重降低产量。
In order to understand the effect of the intercropping of forest and forestry on the wheat, the shading test was designed to study the relationship between shading and the growth and yield of wheat under the same soil and water and fertilizer conditions. The results showed that the light transmittance of 57.3% of the shading treatment, the wheat phenophase postponed 2 ~ 4d; early (May 4) diversity index, green leaf area and aboveground biomass were 164.9%, 177.9% And 159.80. Visible shading promotes individual growth. However, from the beginning of heading stage, the leaf light intensity was too high (9.9) due to the high leaf area index (9.9), the group was severely deficient in light, the tillering in spring and a large number of death in the lower leaves eventually resulted in the aboveground biomass being only 90% of the control and the grain yield decreasing by 11.0% , 1000 grain weight decreased by 9.4%. This shows that in the long run of agriculture and forestry, we should ensure that the relative light intensity of wheat obtained 50% to 60%, it will not seriously reduce the yield.