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民勤沙区不同稳定性沙丘植被生境条件研究
引用本文:常兆丰,赵明,韩福贵,仲生年.民勤沙区不同稳定性沙丘植被生境条件研究[J].干旱区研究,2004,21(4):384-388.
作者姓名:常兆丰  赵明  韩福贵  仲生年
作者单位:甘肃省治沙研究所,武威,733000
基金项目:国家"十五"科技重点攻关项目(2002BA)资助
摘    要:固定、半固定和流动沙丘生境条件测定结果表明:固定沙丘优势种均生长不良,枯梢、死亡普遍,其伴生植物的种类和密度均很小;沙丘水分条件决定了其生境条件,固定沙丘水分条件最差亦即生境条件最差;固定沙丘和半固定沙丘表面易形成粘粒、粉粒结皮,其表土层田间持水量大,影响降水下渗;固定沙丘表面田间持水量大是影响降水下渗的关键,其沙丘表土层粘粒、粉粒含量高是导致其田间持水量大的关键。其伴生草本植物密度并不随表土层田间持水量大而增加的原因,主要是由于当地降水少、气候干燥、表土层土壤水分易蒸发损耗所致。

关 键 词:沙丘  稳定性  植被  生境  民勤
文章编号:1001-4675(2004)04-0384-05

Study on the Habitats of the Vegetation on the Dunes with the Different Stabilities in the Minqin Sandy Area
CHANG Zhao-feng,ZHAO Ming,HAN Fu-gui,ZHONG Sheng-nian.Study on the Habitats of the Vegetation on the Dunes with the Different Stabilities in the Minqin Sandy Area[J].Arid Zone Research,2004,21(4):384-388.
Authors:CHANG Zhao-feng  ZHAO Ming  HAN Fu-gui  ZHONG Sheng-nian
Abstract:The species, coverage and height of the plants growing on the fixed, semi-fixed and mobile dunes in Minqin sandy area are different, and the natural vegetation on dunes is dominated by shrubs and herbages, such as Nitraria tangutorum, Tamarix ramosissima, Artemisia arenaria, Suaeda glauca,Agriophyllum squarrosum and Limonium aureum, and the planted plants are dominated by Haloxylon ammodendron and Calligonum mongolicum. In this paper, the habitats of the fixed, semi-fixed and mobile dunes in Minqm sandy area are researched. The results show that the growth of the dominant species of plants on the fixed dunes is not so well, the dried-up of the plant tips and the plant death are universal, the accompanying plant species art less and their coverage is low. The habitats are strongly affected by the moisture content in dunes, the moisture content in the fixed dunes is the lowest and their habitats are the poorest. It is easy to form the clay or silt crusis on the surface of the fixed and semi-fixed dunes. Water conservation capability of topsoil is high, so precipuation is difficult to permeate downward. The coverage of the accompanying plants does not increase with the increase of water conservation capability of topsoil because the precipitation in the study area is less, the climate is and, and the moisture in topsoil is easy to be evaporated.
Keywords:dune  stability  vegetation  habitat  Minqm
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