水稻叶面积指数和产量的空间变异性及关系研究

Spatial variability and relationships of rice leaf area index and yield

该文运用地质统计学方法分析了水稻叶面积指数与产量的空间分布及关系,结果表明:叶面积指数和产量均近似正态分布;在所研究的条件下,产量和大部分生育阶段(除拔节期)的叶面积指数都具有空间结构;孕穗期、抽穗期和乳熟期叶面积指数与产量在一定范围内具有显著空间相关关系。借鉴指示克立格的思想,提出了指示值分布法,分析了以上3个生育阶段的综合叶面积指数分布与产量的关系,该方法不仅对于水稻的遥感估产和精确农业的实施具有借鉴意义,且对于其它领域研究某一变量与某几个变量的空间分布关系,或某一变量随时间的动态变化与另一个变量的关系具有一定的参考价值。

Spatial distributions and relationship between rice leaf area index and yield were analyzed using geosta- tistical methods. The results show that： （1） Leaf area index and yield are approximately normally distributed; （2） Under the discussing conditions, rice yield and leaf area index during most of developmental stages are spatially structured; （3）Yield and leaf area index during booting stage, heading stage and milk stage are positively correlated across up to 12 m or so and their correlations are considered significant across different distances depending on different developmental stages. The theory of indicator Kriging being used for reference, the method of the indicator value distribution which was proposed in the article was used to analyze the relationships between yield and combined leaf area index obtained from several developmental stages. The method is significant to perform precision farming and estimate rice yield and can be used for reference in studying spatial relationship between one variable and several variables or that between one variable and dynamic distributions of the other one.