新疆北疆不同积温条件下棉花生育进程及生长解析

以新疆北疆玛河流域棉田为例，通过分期播种的方式调控积温，分析了不同积温下棉花的生育进程，并利用植物生长解析法研究了棉花干物质积累与分配、叶面积指数、净同化率、相对生长率以及群体生长率的动态变化规律，研究了不同积温水平下棉花群体生长率与叶面积指数的关系。研究结果表明：棉花完成各生育阶段所需的有效积温是一定的，而活动积温具有一定的波动性，但是较生育期天数而言波动性小；不同积温水平下的棉花结铃盛期至吐絮期的干物质积累量差异最为明显；群体生长率（CGR）和叶面积指数（LAI）之间具有一元二次函数的关系，由此可以确定棉花的最适宜叶面积指数。

Growth Stage and Growth Analysis on Cotton with Different Accumulate Temperature in North of Xinjiang

With the cotton of North Xinjiang as the study case, the cotton ’ s growth stage was analysed by regulating seeding dates for different accumulate temperature. The growth analysis method was used to study the accumulating and partitioning process of dry matter in cotton and the change of LAI, NAR, RGR and CGR as well as the relationship of LAI and CGR. The results showed cotton must attain certain effective accumulated temperature to complete its growth stage, and active accumulated temperature has certain fluctuations, but less than fluctuations of days of growth period. The dry matter from full boll stage to opening boll stage had the obvious difference under the different accumulate temperature. Furthermore, we find a strong correlation between CGR and LAI, and which can determine the most suitable leaf area index.