文献类型： 外文期刊
作者： Lue Chuan-gen 1 ; Yao Ke-min 2 ; Hu Ning 2 ;
作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Crops, Nanjing 210014, Peoples R China
2.Nanjing Univ Informat Sci & Technol, Coll Appl Meteorol, Nanjing 210044, Peoples R China
关键词： canopy structure;layered leaf area index (LAI(k));model;plant type;rice
期刊名称：AGRICULTURAL SCIENCES IN CHINA （ 影响因子：0.82； 五年影响因子：0.997 ）
ISSN： 1671-2927
年卷期： 2011 年 10 卷 3 期
页码：
收录情况： SCI
摘要： Layered leaf area index (LAI(k)) is one of the major determinants for rice canopy. The objective of this study is to attain rice LAI(k) using morphological traits especially leaf traits that affected plant type. A theoretical model based on rice geometrical structure was established to describe LAI(k) of rice with leaf length (L(i)), width (W(i)), angle (A(i)), and space (S(i)), and plant pole height (H) at booting and heading stages. In correlation with traditional manual measurement, the model was performed by high R(2)-values (0.95-0.89, n=24) for four rice hybrids (Liangyoupeijiu, Liangyou E32, Liangyou Y06, and Shanyou 63) with various plant types and four densities (3750, 2812, 1 875, and 1 125 plants per 100 m(2)) of a particular hybrid (Liangyoupeijiu). The analysis of leaf length, width, angle, and space on LAI(k) for two hybrids (Liangyoupeijiu and Shanyou 63) showed that leaves length and space exhibited greater effects on the change of rice LAI(k). The radiation intensity showed a significantly negative exponential relation to the accumulation of LAI(k), which agreed to the coefficient of light extinction (K). Our results suggest that plant type regulates radiation distribution through changing LAI(k). The present model would be helpful to acquire leaf distribution and judge canopy structure of rice field by computer system after a simple and less-invasive measurement of leaf length, width, angle (by photo), and space at field with non-dilapidation of plants.
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