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【目的】棉花冠层光能空间分布是光能利用率高低的直接影响因素之一。为科学量化光能在棉花冠层的空间分布,本研究旨在分析冠层内光合有效辐射(Photosynthetically active radiation,PAR)各分量的空间变化特征。【方法】用空间统计学方法分析了冠层不同空间点、线、面位置PAR的分布特征。【结果】盛花期棉花行间冠层PAR截获率整体变化呈“V”形,即棉行间PAR截获率低于棉行附近位置;高密度的群体冠层中下部PAR截获率纵向变化速率较缓,同时在距地面60 cm处PAR截获率横向变化幅度也较小;不同冠层区域的PAR截获率与密度呈正相关关系,且随播种后时间均呈现先增后减的变化趋势。【结论】适当增大种植密度可以提高群体PAR截获率。运用空间统计学原理精确定位定量分析冠层内PAR的分布,对合理配置棉花种植模式、研究群体株型结构、培育高光效品种具有指导意义。
【Objective】 Spatial distribution of light energy in cotton canopy is one of the direct factors affecting the utilization of light energy. In order to quantitatively quantify the spatial distribution of light energy in cotton canopy, this study aimed to analyze the spatial variation characteristics of photosynthetically active radiation (PAR) components in the canopy. 【Method】 Spatial statistical methods were used to analyze the distribution of PAR in different spatial points, lines and planes in the canopy. 【Result】 The results showed that the PAR interception rate of full-flowering cotton was “V” shape, that is, the interception rate of PAR between cotton rows was lower than that near the cotton row. The vertical interception rate of PAR in the middle and lower canopy of high- The rate of PAR interception at 60 cm from the ground was also small. The interception rate of PAR in different canopy areas was positively correlated with the density, and the change trend of the PAR interception increased first and then decreased. 【Conclusion】 Appropriate increase of planting density can improve population PAR interception rate. Accurately positioning and analyzing the distribution of PAR in the canopy using the principle of spatial statistics can guide the rational allocation of cotton planting patterns, study of the plant type structure and breeding of high light efficiency varieties.