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黄土高原丘陵沟壑区主要造林树种细根生物量分布规律研究 预览 被引量:4

Research on the fine roots biomass and distribution of main afforestation tree species in Loess Plateau
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摘要 以2 mm为粗、细根的划分界限,采用根钻法对黄土高原安家沟流域油松、白杨、山杏、刺槐、沙棘和柠条6个主要造林树种细根分布进行调查研究,同时测定不同树种林地下的土壤含水量。结果表明:在垂直方向上,随着土层深度的加深,细根生物量均呈现出减小的趋势;在水平方向上,油松细根生物量呈现先增大后减小的二次多项式分布,其余5个树种细根生物量均呈现对数分布,并且水平根系发达,细根主要分布在冠幅半径2—3倍左右的范围内,表明各植被通过水平扩张来获取土壤浅层的大气降水。各造林树种样地土壤含水量由生长季初期到末期呈现降低的趋势,土壤含水量决定着细根生物量的大小和分布。 The distribution of fine roots(diameter ≤ 2 mm) of Pinus tabuliformis, Populus tomentosa, Prunus armeniaca, Robinia pseudoacacia, Hippophae rhamnoides, Caragana korshinskii was investigated by using root drilling method, and the soil water content beneath different species was measured in Loess Plateau. The results showed that the fine roots biomass of all these species decreased with the increase in soil depth in the vertical direction; horizontally, however, the distribution of fine roots biomass of Pinus tabuliformis had a conic curve, and that of other species had logarithm correlation, and the roots flourished; the fine roots mainly grew in the range of tree crown radius width 2 or 3 times, indicating that all the 6 tree species got rainfall from the shallow soil through the horizontal expansion. The soil water content displayed a decrease trend form the beginning to the end of growing season in each sample plot, and the biomass and the distribution of fine roots were influenced by the quantity and distribution of soil water content.
作者 岳玮 刘讯 刘姜艳 YUE Wei,LIU Xun,LIU Jiangyan(1. Gansu Academy of Environmental Science, Lanzhou 730020, China; 2. Guizhou Normal College, Guiyang 550000, China)
出处 《生态科学》 CSCD 2015年第5期58-65,共8页 Ecologic Science
基金 贵州省社会发展攻关项目(黔科合SY4[2013]3164)
关键词 黄土高原 细根 土壤含水量 Loess Plateau fine roots soil water content
作者简介 岳玮(1982-),女,甘肃天水人,硕士,助理工程师,主要从事环境影响评价,E—mail:yuewei_see@163.com 通信作者:刘讯,男,博士,副教授,主要从事生态恢复研究,E-mail:liuxun-hn@126.com
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