干旱区研究2012，Vol.29Issue(4)：641-647,7.
荒漠草原不同地形条件下土壤水分和地上生物量的时空分异
Spatiotemporal Distribution of Soil Moisture Content and Aboveground Biomass under Different Terrains in Desert Steppe
摘要
Abstract
It is of significance to investigate soil moisture content and aboveground biomass under different ter- rains in desert steppe for understanding the effects of terrain on spatiotemporal heterogeneity of soil moisture content and aboveground biomass. Based on the TDR and field survey, we analyzed the heterogeneity of soil moisture con- tent and aboveground biomass under 3 different terrains using the multivariate analyses, such as the one-way ANO- VA, multiple comparison and Kriging interpolation. We also used the person correlation coefficient to analyze the relationship between soil moisture content and aboveground biomass and to clarify the effects of soil moisture content in different soil layers on vegetation at different growth stages. The results are as follows ： （ 1 ） The vertical distribu- tion of soil moisture content was obvious, and CV was the lowest in soil layer of 0 - 20 cm but the highest in soil layer of 60 - 80 cm. The spatial heterogeneity of aboveground biomass was significant in whole growth season ; （2） Soil moisture content and its spatiotemporal distribution pattern were different among .the 3 different terrains, it means that terrain was the key factor affecting soil moisture content; （3） Terrain was not the main factor affecting the spatial variation of grassland productivity, and it affected significantly the dynamic vegetation growth but slightly the aboveground biomass; （4） The relationship between soil moisture content and aboveground biomass was differ- ent at different growth stages. Water consumption for vegetation growth at the initial growth stage was mainly from soil layer of 60 -100 cm; there was a weak correlation between soil moisture content and biomass at other growth stages, which may be related to the formation time of drought-tolerant organs of plants.关键词
荒漠草原/地形/土壤水分/生物量/时空分布/盐池/宁夏Key words
desert steppe/terrain/soil moisture content/biomass/spatiotemporal/Yanchi country/Ningxia分类
农业科技引用本文复制引用
方楷,宋乃平,魏乐,安慧..荒漠草原不同地形条件下土壤水分和地上生物量的时空分异[J].干旱区研究,2012,29(4):641-647,7.基金项目
国家自然科学基金项目（30960075）资助 （）
