摘要
为揭示棉麦两熟共生期遮荫对棉花产量与品质形成的影响 ,在棉花苗期利用模拟棉麦两熟共生期遮荫的方法进行了研究 .结果表明 ,遮荫对棉铃形成的影响因果枝、果节部位而异 ,遮荫有利于棉株下 (1～ 3果枝 )、中 (4～ 6果枝 )、上 (7～ 9果枝 )部果枝内围 (1～ 2果节 )铃的形成 ,对外围 (≥ 3果节 )尤其顶部果枝 (≥ 10果枝 )外围铃形成不利 ,从而决定铃重也随果枝、果节部位相应地变化 ,但遮荫对单株平均铃重的影响较小 .就遮荫棉花籽棉产量而论 ,下、中部果枝的内围铃籽棉产量高于常规棉 ,在上、顶部果枝则相反 ,各部位果枝外围铃的籽棉产量均低于常规棉 .遮荫棉花内、外围铃分布为 1∶0 .36 (常规棉为 1∶0 .5 8) ,产量分布为 1∶0 .4 2 (常规棉为 1∶0 .72 ) .苗期遮荫对棉纤维、棉籽品质性状的影响也主要在顶部果枝和上部果枝外围铃 .综合分析遮荫棉花产量与品质的形成 ,棉花苗期耐遮荫性品种间存在差异 ,在本研究中以中 94 18耐遮荫性最强 ,中棉所
The effect of shading during symbiotic stage of inter cropped cotton and wheat on cotton yield and its quality formation was examined by simulated shading at the seedling stage of cotton.The results showed that the effect of shading on the cotton boll formation depended upon the position of frurting branch and fruiting bud.For the bolls at low(1～3 fruiting branches) and middle(4～6 fruitng branches) parts and the inside bolls(1～2 fruiting buds)on upper(7～9 fruiting branches)fruiting branch,shading favored boll formation, but for the outside bolls(≥3 fruiting buds),especially at the top fruiting branch position, shading was unfavorable to boll formation.The effect of shading on the weight of individual boll also depended upon the position of fruiting branch and fruiting bud,but shading did not affect the mean boll weight per plant. For seed cotton yield per plant,the inside boll yield of shaded low and middle fruiting branches was higher than the control, but that of the upper and top fruiting branches was just contrary,the yield of outside bolls of all branches was lower than the control.For the distribution of the inside and outside bolls, shaded cotton was 1∶0\^36,versus 1∶0\^58 for the control.For the yield distribution,shaded cotton was 1∶0\^42,versus 1∶0\^72 for the control.The effect of shading on the cotton fiber and seed quality was mainly restricted on the bolls of top fruiting branches and the outside bolls of upper fruiting branches.The results also showed that different cotton varieties were different in their shade tolerance,according to comprehensive analysis of the yield and quality formation, and the shade tolerance of variety Zh9418 was stronger than that of Zh19 and CAZ.
出处
《应用生态学报》
CAS
CSCD
2002年第8期997-1000,共4页
Chinese Journal of Applied Ecology
基金
山东省"三 0工程"项目
国家自然科学基金资助项目(3 0 170 5 45 ) .
关键词
苗期遮荫
棉花
产量
品质形成
Seedling stage, Shading, Cotton, Yield and quality formation.
