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	Determinants of spatial diversity in modern wheat: examples from Australia and China
	Smale M. ; Meng E. ; Brennan J. P. ; Hu R. F.
	2003
英文摘要	The spatial distribution of modern varieties, and the genes they embody, has economic value because it affects crop productivity from year to year. Since farmers choose varieties based on observable traits rather than the genes they cannot see, a first step in understanding the spatial distribution of genes is to better understand the determinants of the spatial distribution of varieties. In this paper, we have constructed spatial diversity indices from area distributions of modern wheat varieties in Australia and China. We hypothesise that factors explaining variation in these indices are related to farmers' demand for traits and the supply of varieties, given physical features of the production environment. We test these hypotheses using reduced form equations for three concepts of spatial diversity, richness, abundance and evenness, using Zellner's seemingly unrelated regression (SUR). Spatial diversity indicators and analyses of this type, if more fully developed and targeted to address specific policy issues, may assist in monitoring crop genetic diversity or 'refuge' targets associated with the diffusion of some genetically modified crops. (C) 2002 Elsevier Science B.V. All rights reserved.
出处	Agricultural Economics
卷	28
期	1
页	13-26
收录类别	SCI
语种	英语
ISSN号	0169-5150
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23075]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Smale M.,Meng E.,Brennan J. P.,et al. Determinants of spatial diversity in modern wheat: examples from Australia and China. 2003.

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