干旱区生态环境知识资源中心(Arid): Variability of Soil Salinity at Multiple Spatio-Temporal Scales and the Related Driving Factors in the Oasis Areas of Xinjiang, China

Arid

DOI	10.1016/S1002-0160(14)60062-X
	Variability of Soil Salinity at Multiple Spatio-Temporal Scales and the Related Driving Factors in the Oasis Areas of Xinjiang, China
	Zhang Wentai; Wu Hongqi; Gu Haibin; Feng Guanglong; Wang Ze; Sheng Jiandong
来源期刊	Pedosphere
ISSN	1002-0160
出版年	2014
卷号	24 期号:6 页码:753-762
英文摘要	Located in the inland arid area of central Asia, salt-affected farmlands take up one third of the total irrigated land area in Xinjiang of Northwest China. Spatio-temporal variability of soil salinity and the underlying mechanism are fundamental problems challenging the sustainability of oasis agriculture in China. In this study, the data of total dissolved solids (TDS) measured for soil samples collected from 27 representative study areas in the oasis areas of Xinjiang were analyzed and the coefficient of variation (CV) and stratification ratio (SR) of TDS were used to describe the lateral and vertical soil salinity variations, respectively. Weekly, monthly, and annual changes in soil salinity were also summarized. Results showed that the top (0-20 cm) soil salinity was highly variable (CV >75%) for most studied areas. Lateral variation of soil salinity was significantly correlated with the sampling interval; as a result, a maximum sampling interval of 0.9 m was found for reducing evaluation uncertainty. The top 0-20 cm soil salt accounted for about 25.2% of the total salt in the 0-100 cm soil profile. The stratification ratio values (the ratio of TDS at the 2040 cm depth to that at the 0-20 cm depth) were mostly smaller than 1 and on average 0.92, illustrating that the top 0-20 cm soil contained slightly more salt and a considerable amount of salt still existed in subsurface and deep horizons. Irrigation reduced top soil salinity by 0.52 g kg~(-1), or 14.6%, within the first week. On average, the relative range of soil salinity, calculated to indicate monthly changes in soil salinity, was 58.2% from May to September. A 27-year experiment indicated that cultivation increased soil salinity by 44.4% at a rate of 0.14 g kg~(-1) year~(-1). At small spatio-temporal scales, soil salinity variation was mainly affected by anthropogenic factors, such as irrigation and land use. However, natural factors, including groundwater, topography, and climate conditions, mainly influenced soil salinity variation at large spatio-temporal scales. This study displayed the highly variable nature of soil salinity in space and time. Those driving factors identified in this study could provide guidelines for developing sustainable agriculture in the oasis areas and combating salinization in arid regions of China.
英文关键词	coefficient of variation cultivation irrigation salinization stratification ratio sustainable agriculture total dissolved solids
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Science & Technology - Other Topics
CSCD记录号	CSCD:5311097
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335427
作者单位	Zhang Wentai, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China.; Wu Hongqi, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China.; Gu Haibin, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China.; Wang Ze, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China.; Feng Guanglong, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, State Key Laboratory of Desert and Oasis Ecology, Urumqi, Xinjiang 830011, China.; Sheng Jiandong, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, State Key Laboratory of Desert and Oasis Ecology, Urumqi, Xinjiang 830052, China.
推荐引用方式 GB/T 7714	Zhang Wentai,Wu Hongqi,Gu Haibin,et al. Variability of Soil Salinity at Multiple Spatio-Temporal Scales and the Related Driving Factors in the Oasis Areas of Xinjiang, China[J],2014,24(6):753-762.
APA	Zhang Wentai,Wu Hongqi,Gu Haibin,Feng Guanglong,Wang Ze,&Sheng Jiandong.(2014).Variability of Soil Salinity at Multiple Spatio-Temporal Scales and the Related Driving Factors in the Oasis Areas of Xinjiang, China.Pedosphere,24(6),753-762.
MLA	Zhang Wentai,et al."Variability of Soil Salinity at Multiple Spatio-Temporal Scales and the Related Driving Factors in the Oasis Areas of Xinjiang, China".Pedosphere 24.6(2014):753-762.