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

doi:10.11963/1002-7807.zxylyb.20170407

棉花学报 ›› 2017, Vol. 29 ›› Issue (4): 365-373.doi: 10.11963/1002-7807.zxylyb.20170407

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^*

中国农业科学院棉花研究所／棉花生物学国家重点实验室，河南安阳 455000

收稿日期:2015-11-27 出版日期:2017-07-15 发布日期:2017-07-15
通讯作者: criliyabing@163.com
作者简介:支晓宇（1990―），女，硕士研究生，zhixiaoyu316@126.com。
基金资助:
农业部公益性行业专项：华北棉区棉花全程机械化关键技术及其农艺技术研究与示范（201203057-01）；国家科技支撑项目：盐碱旱地棉花早熟调控技术及水肥高效利用关键技术研究（2014BAD03B02-2）

Changes to the PAR Spatial Distribution, Biomass, and Fiber Quality in Response to Plant Densities

Zhi Xiaoyu, Han Yingchun, Wang Guoping, Feng Lu, Yang Beifang, Fan Zhengyi, Du Wenli, Lei Yaping, Mao Shuchun, Li Yabing^*

Institute of Cotton Research of the CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China

Received:2015-11-27 Online:2017-07-15 Published:2017-07-15

摘要/Abstract

摘要： 【目的】研究不同密度群体棉花生育期、光合有效辐射（PAR）分布、叶面积指数（LAI）和干物质累积特征值的差异。【方法】供试品种为转Bt（Bacillus thuringiensis）基因杂交种中棉所75（CCRI 75）和常规品种鲁棉研28（SCRC 28），2012和2013年密度处理为1.5万、5.1万和8.7 万株·hm^－2。【结果】不同密度群体在棉花不同生育期PAR存在显著差异，且冠层光透射率随密度增加而减少，不同种植密度的棉花群体冠层株型结构各不相同，不同群体棉花茎叶的空间分布决定PAR的分布；LAI随生育进程呈现出开口向下的抛物线，不同的密度群体LAI均在播种后60 d左右开始快速增加，100 d或110 d后LAI开始急速下降；随密度增加最大生物量累计值减少，且营养器官占单株总干物质的比例增加，而生殖器官所占比例下降；密度显著影响马克隆值大小，高密度下马克隆值最大。【结论】本研究为棉花田间管理、合理密植提供理论依据。

关键词: 棉花; 密度; 光合有效辐射; 生物量

Abstract: The purpose of this study was to analyze how cotton (Gossypium hirsutum L.) growth periods, PAR distribution, 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 2013. Three plant densities were analyzed (i.e., 15 000, 51 000, and 87,000 plants·hm-2). [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 rapidly from 60 days after sowing (DAS) in 2012 and 2013. However, there was a sharp decrease in the LAI at 100 DAS in 2012 and 110 DAS in 2013. As the plant density increased, the maximal accumulated biomass decreased, while an increasing proportion of the biomass was derived from vegetative rather than reproductive organs. Plant density also significantly affected the Micronaire value, with the highest value obtained under high plant density. [Conclusion] These findings may be relevant for determining the optimal plant density for enhanced cotton cultivation.

Key words: cotton; plant density; PAR; biomass

中图分类号:

S562.01

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. 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[J]. 棉花学报, 2017, 29(4): 365-373.

Zhi Xiaoyu, Han Yingchun, Wang Guoping, Feng Lu, Yang Beifang, Fan Zhengyi, Du Wenli, Lei Yaping, Mao Shuchun, Li Yabing. Changes to the PAR Spatial Distribution, Biomass, and Fiber Quality in Response to Plant Densities[J]. Cotton Science, 2017, 29(4): 365-373.

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链接本文: https://journal.cricaas.com.cn/Jweb_mhxb/CN/10.11963/1002-7807.zxylyb.20170407

https://journal.cricaas.com.cn/Jweb_mhxb/CN/Y2017/V29/I4/365

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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

Changes to the PAR Spatial Distribution, Biomass, and Fiber Quality in Response to Plant Densities

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