杨农间作光能利用的研究  

A STUDY ON LIGHT UTILIZATION OF POPLAR\|CROP INTERCROPPING SYSTEM

作　　者：裴保华[1] 袁玉欣[1] 贾玉彬[1] 王文全[1] Josef Eitzinger 

机构地区：[1]河北农业大学,保定071000 [2]UniversittfrBodenculturWienInsititutfrMeteorologieundPhisikAUSTRIA

出　　处：《林业科学》2000年第3期13-18,共6页Scientia Silvae Sinicae

基　　金：河北省首届自然科学基金!资助项目 ( 3 93 0 3 3 )

摘　　要：根据实测光强 ,利用作物和树木光———光合曲线中的最大光合速率和表观量子效率以及各物候期的叶面积系数 ,叶幕消光系数等参数 ,估算了杨农间作与单一农作物 (对照 )的光能利用率。结果表明 ,三种杨农间作模式的总光能利用率都高于对照 ,约可提高 2 7 5 6 %～ 48 6 4%。间作田农作物的日累积光合量随日累积光量减少而降低 ,呈线性正相关。当相对光强 >6 0 %时 ,间作田农作物的光能利用率稍高于对照田农作物 ;相对光强 <5 0 %时 ,间作田农作物的光能利用率与对照田相似 ,这是因为弱光下 ,农作物呼吸并未减弱引起的。日累积光合量和农作物产量测定表明 ,间作田农作物的加权平均产量与对照田产量的比率与两者日累积光合量的比率相近 。The light utilization coefficents(LUC) of poplar\|crop intercropping system and pure crops(CK) were both simulated by measuring the actual parameters of crop or poplar, i.e. light intensity, maximum photosynthetic rate(PR) and quantum efficiency, leaf area index in different phenophases and light extinction coefficient of leaf curtains. The results demonstrated that, in intercropping system, the crop photosynthesis cuulating decreased with the daily light cumulating decreasing, which they were linear positive correlation. The crop PR in intercropping system was slightly higher than that in pure crop system when its relative light intensity(RLI) was more than 60%, but they were similar when RLI was less than 50%, bucause its respiration did not decrease under weak light intensity. The total LUC of three intercropping systems were higher than that of pure crop system by 27.56%～48.64%. It showed that the ratio of weighted average yield of intercropping system and pure crop system was similar to their ratio of daily photosynthesis cumulating, which prove that the simulation method is practicable.

关 键 词：农林复合系统 杨树 农作物 林农间作 光能利用 

分 类 号：S753.536[农业科学—森林经理学] S792.110.5[农业科学—林学]