不同密度对新疆高产棉花冠层结构光合特性和产量形成的影响

研究了北疆棉区推广棉种新陆早 10号与新陆早 12号在不同种植密度条件下冠层结构特征和光合特性的差异 ,得出高密度植棉理论密度 2 2 5 0 0 0株 /hm2 是较为适宜的种植密度。研究结果显示 ,群体密度过高或过低都不利于形成理想群体冠层和获得高产。 2品种相比 ,新陆早 10号较新陆早 12号对高密度反应敏感 ,高密种植可获得较高产量。因此在高密条件下选择新陆早 10号 ,中高密条件下选择新陆早 12号栽培种植较为适宜。叶面积指数升高 ,叶片平均倾斜角度减小 ,群体散射辐射透过系数和群体直射辐射透过系数降低 ,对光能的截获率增加 ,由此得出了不同品种对种植密度的反应表现及理想群体冠层结构的合理指标 ,为增加棉花产量提供了理论依据

Effect of Different Density on Cotton Canopy Structure, Photosynthesis and Yield Formation in High-yield Cotton of Xinjiang

This paper mainly discussed the differences of cotton canopy structural characteristics and Photosynthetic quality in different density condition of the extend breed Xinluzao10 and Xinluzao12 in North Xinjiang cotton growing region, then discovered that high-density of theoretic plants 225 000 plants/hm~2 is the more sensible plant density. The experiment results indicated that both exorbitant density and too lower density of colony density are all not avail to forming ideal canopy structure and taking high yield. By the comparison between the two varieties, Xinluzao10 is more sensitive to high density and can acquire higher yield. Thus Xinluzao10 is better at high density condition and Xinluzao12 is better at mid-high density condition. Reduce LAI and canopy light interception, then increase canopy mean foliage inclination angle and transmission coefficient for diffuse penetration, transmission coefficient for radiation penetration. Then acquired the response of varieties toward different density and the ideal reasonable index of cotton canopy structure, and come to theoretical ground of increasing cotton production.