不同密度下棉花群体光辐射空间分布及生物量和纤维-中国棉花杂志社.PDF

棉 花 学报 Cotton Science 2017, 29(4): 365―373 不同密度下棉花群体光辐射空间分布及生物量和纤维品质的变化 支晓宇 韩迎春 王国平 冯璐 杨北方 范正义 杜文丽 雷亚平 毛树春 李亚兵* 国农业科学院棉花研究所 棉花生物学国家重点实验室袁河南安阳455000 冤 摘要院揖目的铱研究不同密度群体棉花生育期尧光合有效辐射 PAR 冤分布尧叶面积指数 LAI 冤和干物质累积特征 值的差异遥 揖方法铱供试品种为转 冤基因杂交种中棉所75 CCRI 75 冤和常规品种鲁棉研 28 SCRC 28 冤袁20 12 和2013 年密度处理为1.5 万尧5.1 万和8.7 万株窑hm－2 遥揖结果铱不同密度群体在棉花不同生 育期PAR 存在显著差异袁且冠层光透射率随密度增加而减少袁不同种植密度的棉花群体冠层株型结构 不相 同袁不同群体棉花茎叶的空间分布决定PAR 的分布曰LAI 随生育进程呈现出开口向下的抛物线袁不同的密度 群体LAI 均在播种后60 d 左右开始快速增加袁100 d 或110 d 后LAI 开始急速下降曰随密度增加最大生物量累 计值减少袁且营养器官占单株总干物质的比例增加袁而生殖器官所占比例下降曰密度显著影响马克隆值大小袁 高密度下马克隆值最大遥 揖结论铱本研究为棉花田间管理尧合理密植提供理论依据遥 关键词院棉花曰密度曰光合有效辐射曰生物量 中图分类号院S562.01 文献标志码院A 文章编号院1002-7807(2017)04-0365-09 10.11963/ 1002-7807.zxylyb Zhi Xiaoyu, Han Yingchun, Wang Guoping, Feng Lu, Yang Beifang, Fan Zhengyi, Du Wenli, Lei Yaping, Mao Shuchun, Li Yabing* ( 455000, ) [Objective] The purpose of this study was to analyze how cotton ( L.) growth periods, PAR distri- bution, LAI, and biomass are affected by different plant densities. [Method] A hybrid cultivar (CCRI 75) and conventional cotton cultivar (SCRC 28)) were used for field experiments in 2012 and 20 13. Three plant densities were analyzed (i.e., 15 000, 51 000, -2 and 87,000 plants hm ). [Result] The PAR distributions during various growth periods were significantly different among the three tested plant densities. The amount of transmitted light decreased as the plant density increased. Moreover, the canopy structure and plant type varied with plant densities, which influenced the specific distribution of PAR. Additionally, considerable changes occurred to the LAI over different growth periods. The LAI increased ra