参考作物腾发量空间分形特征初探  

Study on spatial fractal features of reference crop evapotranspiration

作　　者：刘丙军[1] 邵东国[2] 沈新平[2] 

机构地区：[1]中山大学地理学科与规划学院,广东广州510275 [2]水资源与水电工程科学国家重点实验室(武汉大学),湖北武汉430072

出　　处：《水利学报》2007年第3期337-341,348,共6页Journal of Hydraulic Engineering

基　　金：国家重点973项目(2003CB415206);中山大学青年教师科研启动基金

摘　　要：受作物本身生理机制以及近地层气象因子非线性、非平稳化随机变化的影响,参考作物腾发量在空间尺度上呈随机分布。基于此,本文运用分形理论,研究了参考作物腾发量空间分形特征,结果表明参考作物腾发量在一定空间尺度范围内存在一无标度区间,在该无标度区间内参考作物腾发量具有自相似特点。将此方法运用于湖南省参考作物腾发量空间分形特征研究,取得了满意结果,该方法为有资料地区参考作物腾发量成果推广和移植至无资料地区提供了一定的理论依据。The distribution of reference crop evaportranspiration （RCE） is stochastic distributed in spatial scale due to the physiological mechanism of crop and the unsteady nonlinear stochastic variation of meteorological factors. According to its characteristics, the fractal theory is applied to study the spatial fractal features of RCE. It is found that a dimensionless inter-zone exists in a certain spatial scale in which the RCE exhibits the feature of self-similarity. Following this principle the findings obtained from the resource areas can be applied to the non-resource areas. The distribution of RCE in Hunan Province, China, is analyzed as a case study to verify the validity of the proposed method. The result is satisfactory.

关 键 词：参考作物腾发量 分形特征 空间尺度 无标度区间 自相似 

分 类 号：S152.7[农业科学—土壤学]