基于地统计学的棉花冠层光合有效辐射空间分布特征  

Spatial distribution characteristics of photosynthetic active radiation in cotton canopy based on geo-statistics

作　　者：李亚兵[1] 毛树春[1] 冯璐[1] 韩迎春[1] 王国平[1] 范正义[1] 孙恩虹[1] 

机构地区：[1]中国农业科学院棉花研究所棉花生物学国家重点实验室/农业部棉花遗传改良中心,安阳455000

出　　处：《农业工程学报》2012年第22期200-206,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金(31071368);农业部公益性行业科研专项(201203057-01)

摘　　要：为了量化作物群体质量,和准确科学计算光合有效辐射(photosynthetical active radiation,PAR)空间分布,该文利用空间统计学理论和方法,以不同棉花群体为研究对象,研究了不同群体PAR的空间分布特征。结果表明:在棉花生长初期,PAR空间变化具有中度空间相关性,中后期,群体PAR空间变化具有高度空间相关性;在棉花生长初期,透光率呈深"V"字形,向两侧边逐渐减小,到了棉花生长中后期封行后,中上部呈浅"V"形,中下部基本呈线性递减;6个棉花群体生育期平均透射光率呈现二次方程曲线变化趋势,从整个生育期PAR截获率看,PAR截获率随密度增加,群体棉花生物量逐渐增加,但增速减小,而经济学产量到69000万株/hm2时开始下降。该文为标准化生产管理提供依据。Photosynthetic active radiation （PAR） using efficiency is an important factor affecting crop yield and quality. Precisely and accurately quantifying PAR spatial distribution within crop canopy is of great significance for reasonable plant density arrangement,plant architecture molding,and variety selection for high yield. In this study, Geo-statistical theory and methods were applied to study the PAR spatial distribution in 6 different cotton plant densities. Spatial correlations of PAR and spatial distribution characteristics of transmittance in different cotton communities were studied. The results showed that： 1） During the early growth stage, PAR spatial distribution had a moderate spatial correlation, with most of the structural component variance proportions below 0.75. However, during the mid-late growth stage, PAR spatial distribution had a high degree of spatial correlation, with almost all the structural component variance proportions above 0.9; 2） At the early cotton growth stage, PAR transmittance exhibited a long and narrow ＂V＂ shape and were gradually reduced from the middle toward the rows. At the mid-late growth stage, PAR transmittance exhibited a short and shallow ＂V＂ shape in the upper canopy and that in the lower part showed gradually linear decrease; 3）The variations of mean PAR transmittance over the whole growth period in 6 cotton communities presented quadratic trends. PAR interception rates were increased over the plant density, and cotton community biomass were increased gradually, but the economic production began to decline in the plant density of 69,000 plants/hm2 .

关 键 词：棉花 辐射 空间异质性测定 空间分布 透光率 

分 类 号：S165.2[农业科学—农业气象学]