极端干旱区胡杨根系分布对土壤水分的响应  

Response of root distribution of Populus Euphratica Oliv.to soil moisture content in extreme arid region

作　　者：李建林[1,2] 冯起[2] 司建华[2] 常宗强[2] 巨登三[3] 

机构地区：[1]河南理工大学资源环境学院,焦作454000 [2]中国科学院寒区旱区环境与工程研究所,阿拉善荒漠生态-水文试验研究站,兰州730000 [3]黄河水利委员会上游水文水资源局,兰州730000

出　　处：《干旱区资源与环境》2009年第11期186-190,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金杰出青年基金项目(40725001);国家自然基金项目(40671010);河南理工大学博士基金项目(2009-28)共同资助

摘　　要：依据2006和2007年6月至7月在极端干旱区额济纳的实测资料,利用分形和统计的方法对胡杨根系分布与根区土壤水分的关系进行了分析研究,建立了土壤含水率与根系分维值之间的函数关系。根系土壤水分的变化对胡杨根系分布有直接影响,当平均土壤含水率小于0.11 cm3/cm3时,根系分布的分形维数随土壤含水率的增加而增大;当土壤含水率期望值大于0.11 cm3/cm3时,根系分布的分形维数随土壤含水率的增加而减小。平均土壤含水率在0.06-0.3 cm3/cm3之间,是适宜胡杨根系生长的范围。Based on the data observed at Ejina Banner from June to July in 2006 and 2007, using fractal theory and statistical method, the relationship between root distribution of Populus euphratica Oliv. and soil moisture content,of root system was analyzed. We got the funetion between soil moisture content and root fractal dimensions, and an interval of soil moisture content, 0.06 -0. 3cm^3/cm^3, which is adaptive for the euphratica growth of Populus Oliv. If soil moisture content was less than 0. 11cm^3/cm^3, then root fractal dimensions increased with soil moisture＇content; if soil moisture conten was more than 0. 11 cm^3/cm^3 ,. root fractal dimensions decreased with soil moisture content. It means that roots distribution of Populus euphratica Oliv. surely has fractal characteristic and soil water affects root distribution directly. So we ean estimate the characteristic of root distribution of P. euphratica oliv by mensuration of soil moisture content in root zone.

关 键 词：极端干旱区 胡杨 根系分布 土壤含水率 根系分维 

分 类 号：S152.7[农业科学—土壤学]