扁桃棉花间作对棉花光合特性及产量影响的初步研究

以大田棉花为对照(CK),与20年生扁桃树下间作棉花(扁桃树下东西两侧第一行的棉花、垂直最大冠幅处的棉花、垂直最大冠幅外2 m处的棉花)的光合特性及产量进行比较研究,结果表明:①扁棉间作改变了棉花光合特性的日变化规律,对照棉花光合作用的日变化规律都呈双峰曲线,而间作棉花的变化规律都呈单峰曲线,峰值出现时间早晚与树影变化长度和方向有关.②扁棉间作对棉花的产量影响很大,主要表现在间作减少了株数单位面积、单位面积铃数和单株成铃数,进而影响了籽棉和皮棉的单位面积产量,扁桃树树冠内侧、树冠外侧2 m处的籽棉平均667m2产分别较对照递减了66.92;和42.78;.

Preliminary Study on Influence of Almond and Cotton Intercropping on Photosynthetic Characteristics and Yield of Cotton

The field of cotton was used as CK,the photosynthetic characteristics and yield of cotton intercropping with the almond tree with 20 years old(The cotton plant of the first row on both sides under the almond tree,the cotton plant with the largest vertical crown,the cotton plant from two meters outside the largest vertical crown) were comparatively analyzed.The results showed that:①almond and cotton intercropping changed the photosynthetic characteristics of diurnal variation,the control of cotton diumal variation of photosynthesis both were bimodal curve,and the change law of cotton intercropping was single peak curve.The occurrence time of peak value sooner or later related to the length and the direction of the almond tree shadows;②almond and cotton intercropping has great influence on the yield of cotton,mainly reflected in the decrease of harvest lints,bolls and total bolls,thereby affecting the seed cotton yield and lint yield,inside of crown almond, (Tow meters from outside of crown almond) the seed cotton yield were decreased by 66.92%and 42.78%.