毛乌素沙地沙柳细根分布规律及与土壤水分分布的关系

摘要/Abstract

摘要： 以2 mm为粗、细根的划分界限,采用根钻法对毛乌素沙地的单株沙柳及沙柳林地的细根分布进行了调查研究,同时测量土壤含水率。结果表明,沙柳细根垂直分布深度为1.5 m左右,且随土壤深度的增加细根生物量逐渐减少,细根根量最大值出现在表层,在0～20 cm范围内集中分布,约占总根量的一半左右。沙柳水平根系发达,细根主要分布在冠幅半径3倍左右的范围内,表明沙柳通过水平扩展来获取分布于土壤浅层的大气降水;丘顶沙柳林地根量小于丘底林地根量,土壤水分的含量和分布决定沙柳细根根量的大小和分布。

关键词: 沙柳, 细根, 土壤水分

Abstract: The distribution of fine roots of individual Salix psammophila and the S. psammophila forest in MU US sandland was investigated by using root drilling method and the fine root was defined as root with diameter less than 2 mm. The soil moisture was measured in the meantime. The results show that the main distribution of fine roots of S. psammophila is not beyond 1.5 m deep in the soil, and the fine root biomass reduces gradually with the increasing of the soil depth. The maximum of the fine root biomass appears in the surface layer of the soil, mainly in 0—20 cm, which takes about half of the total root biomass. The S. psammophila has developed horizontal roots, mainly distributed within the scope of about three times of that of canopy radius, so that it can get water in the shallow soil by horizontal expansion of roots. The roots biomass of the shrub on the top of the sand dune is less than that in the inter-dune. The biomass and the distribution of fine roots are determined by the quantity and distribution of water in soil.

Key words: Salix psammophila, fine roots, soil moisture

中图分类号:

Q948.1

刘健;贺晓*;包海龙;周成军. 毛乌素沙地沙柳细根分布规律及与土壤水分分布的关系[J]. 中国沙漠, 2010, 30(6): 1362-1366.

LIU Jian;HE Xiao;BAO Hai-long;ZHOU Cheng-jun. Distribution of Fine Roots of Salix psammophila and its Relationship with Soil Moisture in Mu Us Sandland[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(6): 1362-1366.

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