草业学报2016，Vol.25Issue(11)：15-24,10.DOI:10.11686/cyxb2016083
荒漠绿洲过渡带白刺灌丛沙堆土壤水分空间分布及入渗特征
Soil moisture spatial distribution and infiltration characteristics of Nitraria nebkha in an oasis-desert ecotone
摘要
Abstract
This study utilized Nitraria tangutorun nebkhas vegetation growing in a desert-oasis ecotone in Minqin to investigate space distribution of soil moisture content and the influence of soil physical properties, particularly soil hardness and crust thickness on water distribution and infiltration of the three evolutionary stages of soil formation;stable sand dune,sand dune formation and moving sand.The aim was to explore the effect of N .tangutorun nebkhas on soil moisture and to establish a theoretical foundation for protective systems for oasis-desert ecotones.The results as follows:1)Soil hardness and crust thickness were highest in the stable dune,intermediate in forming dunes and least in moving sand.2 )Soil surface bulk density was 2.32,2.30 and 1.95 g/cm3 in moving sand,forming dunes and stable dunes respectively;maximum water holding capacity,capillary water content,field capacity and total porosity was highest in the stable dune,inter-mediate in the forming dune and least in the moving sand.Soil physical properties in the subsurface layer were variable in all dune formation stages.3)In the dry season,the lowest soil moisture contents occurred in soils from forming dunes and moving sand at 0,70,150 cm depth,maximum soil moisture occurred at 50,130,110 cm;in the rainy season,surface soil moisture content fluctuated while soil moisture at depth was relatively stable.4)There were significant correlations between rainfall and infiltration in all three stages of soil forma-tion (P <0.01 ).Water infiltration after rainfall events occurred immediately instable and forming dune soils whereas infiltration in moving sand only occurred when rainfall reached a critical threshold;with rainfall grea-ter than 0.12 mm,infiltration was highest in the stable dune,intermediate in forming dune and least in moving sand.关键词
白刺灌丛沙堆/土壤物理性质/水分入渗特征Key words
Nitraria tangutorun nebkhas/soil physical properties/feature of infiltration引用本文复制引用
席军强,赵翠莲,杨自辉,郭树江,王强强,张剑挥..荒漠绿洲过渡带白刺灌丛沙堆土壤水分空间分布及入渗特征[J].草业学报,2016,25(11):15-24,10.基金项目
国家重大林业公益性行业科研专项（201404306），国家自然科学基金项目（31260200）和甘肃省青年基金计划项目（145RJYA270）资助。 （）
