棉花冠层对不同灌水量的反应及其产量形成研究

Study on the Effects of Different Irrigation Volumes on Cotton Canopy

通过探讨新疆北部棉区推广棉种新陆早6号与新陆早8号,在不同灌水量条件下冠层结构特征的差异性,得出新陆早6号对限量滴灌反应不敏感,而新陆早8号对限量滴灌反应较敏感。因此,在限量滴灌条件下,选择新陆早6号种植较适宜。叶面积指数低,叶片平均倾斜角度大,群体散射辐射透过系数和群体直射辐射透过系数增加,光能的截获率降低,由此得出,不同品种对灌水量的反应表现及理想群体冠层结构的合理指标,为增加棉花产量和提高水分利用效率提供了理论依据。

Xinjiang is located in the hinterland of Eurasia, it is rich in sunshine resources but is less in precipitation, and is a typical region of irrigation agriculture. Cotton production in Xinjiang relies mainly on irrigation with surface water, so the effective irrigation is vital important in the cotton production in Xinjiang. In this paper, the effects of different irrigation volumes on cotton canopy of the different varieties in the cotton growing areas in north Xinjiang are researched. The results show that the variety of Xinluzao-6 is sensitive to the limited drip irrigation, but the variety of Xinluzao-8 is not sensitive. Therefore, it is suggested to grow the variety of Xinluzao-6 under drip irrigation. The sunshine catching rate is reduced when the leaf area index is low, the average inclination angle of cotton leaves is high, and the transmissivities of scattering radiation and direct radiation are increased. Thus, the rational indexes of irrigation volumes and canopy structure of the different cotton varieties are obtained, which provide the theoretical basis for increasing cotton yield and the utilization efficiency of water resources.