干旱区生态环境知识资源中心(Arid): 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

Arid

	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
其他题名	Spatiotemporal Distribution of Soil Moisture Content and Aboveground Biomass under Different Terrains in Desert Steppe
	方楷; 宋乃平; 魏乐; 安慧
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2012
卷号	29 期号:4 页码:641-647
中文摘要	运用方差分析、多重比较、Pearson相关系数及克里格插值方法,在时间和空间尺度上分析了荒漠草原地形因素对土壤水分及草地生物量异质性的影响以及土壤水分和生物量的关系。结果表明:荒漠草原地区土壤水分垂直分布规律明显,土壤水分的变异系数在0~20 cm最小、60~80 cm最大;地上生物量在整个生长季的空间异质性较大。3种地形条件下土壤水分含量及时空分布格局各不相同,说明地形是土壤水分异质性的关键影响因子;地形对植物的生长动态规律影响很大,却对地上生物量的空间分异影响较小。不同生育期,土壤水分与地上生物量的关系不同,生长初期地上生物量与60~100 cm土壤水分显著负相关,说明生长初期的土壤水分是植物生长的关键影响因子,并且植物生长耗水主要来自60~100 cm土层;生长旺期和末期的生物量与土壤含水量相关性较弱,这可能与干旱区植物耐旱器官的建成有关。
英文摘要	It is of significance to investigate soil moisture content and aboveground biomass under different terrains 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 content and aboveground biomass under 3 different terrains using the multivariate analyses,such as the one-way ANOVA,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 distribution 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 different 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.
中文关键词	荒漠草原 ; 地形 ; 土壤水分 ; 生物量 ; 时空分布 ; 盐池 ; 宁夏
英文关键词	desert steppe terrain soil moisture content biomass spatiotemporal Yanchi country Ningxia
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4585040
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/228051
作者单位	宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	方楷,宋乃平,魏乐,等. 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]. 宁夏大学,2012,29(4):641-647.
APA	方楷,宋乃平,魏乐,&安慧.(2012).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.干旱区研究,29(4),641-647.
MLA	方楷,et al."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".干旱区研究 29.4(2012):641-647.