摘要
本研究以北疆几个棉花品种（系）为材料，研究高产棉花光合速率（ＣＡＰ，Ｐｎ）日进程与影响因素的关系，结果表明盛花盛铃期随光合辐射量（ＰＡＲ）增加到１５００μＥ２·ｓ－１、叶温升高到３７．１℃，Ｐｎ的日进程加快且增强，１０：００～１４：００达最大值４５．３～４８．９ｍｇＣＯ２·ｄｍ－２ｈ－１，Ｐｎ较高水平维持时间长达６～８ｈ。棉田空气相对温度（ＲＨ）、ＣＯ２浓度日变化呈现较稳定的两头高中间低的特点。土壤含水量对棉花的群体光合速率（ＣＡＰ）的日进程影响最大，系５５０品系花铃中后期土壤干旱，ＣＡＰ比适期灌水低，系５５０的ＣＡＰ降低９．２６％～５１．２８％，８２２降低９．７９％～４５．７１％，中后干旱型棉花８２２的ＣＡＰ降低幅度大于系５５０，降低８．０６％～６３．７７％。两个品系的产量分别下降４４．５９％，３５．３６％，水的利用率减少０．１７４，０．１２８ｋｇ·ｍ－３。说明棉花花铃中后期土壤干旱会严重地抑制群体叶面积扩展，ＣＡＰ迅速降低，限制棉叶光合“源”的增强，光合“库”的扩大，８２２对土壤干旱的反应更加敏感。
The characters of photosynthesis relation between photosynthesis and effection factors in North Xinjiang were studied. The results indicated that the Pn increased with the increasing of PAR and air temperature during fullbloom stage. The highest value of Pn appeared in 10:00～14:30,the higher value remained for 6～8 hours.The daily variation of relative humidity and CO2 density in cotton field were relatively steady with middle high and early and later lower.The effect of soil water on Pndaily variation was the most important.The soil drought during middlelater fullbloom stage made cotton yield decrease 35.30%～51.28%.The tolerance of 822 to soil drought was weaker than that of Xi550.This should be attached importance to in cotton cultivation and breeding.
出处
《新疆农业大学学报》
CAS
1997年第4期9-13,共5页
Journal of Xinjiang Agricultural University
基金
国家"九五"棉花科技攻关项目
关键词
棉花
光合速率
影响因素
cotton
Pn variation
effecting factors
