Multi-Scale Variation in Spatial Heterogeneity for Soil Salinity in the Yellow River Delta
Analysis and interpretation of spatial variability of soil salinity is a keystone in site-specific farming. To better understand patters of multi-scale spatial variability in soil salinity, soil samples (30 to 40 cm depth) were collected with separation distances of 0.04, 0.2, 1 and 6 km in the Yellow River Delta of China. Laboratory measurements of soil salt content were also made from these samples (n =239). Morans I autocorrelation coefficient was computed at preselected lag distances and correlograms were plotted to examine trends in autocorrelation. Spatial autocorrelation was found at scales ranging from 0.7 km to more than 75 km, depending on the sampling scale considered. A correlation range in regional scale appeared to be associated with elevation height, while a shorter range in field scale was likely influenced by alternating land use/land cover or microtopography types. Morans I correlogram calculated with salinity data from all of the sampling locations suggested spatial pattern detection for soil salinity can be achieved with a sampling interval of approximately 2 km or less. The magnitude and spatial patterns of soil salinity have implications for devising appropriate cropping schemes and design of soil sampling strategies in the Yellow River Delta.
Soil salinity multi-scale Morans I correlogram soil mapping Yellow River Delta
Hong Wang GaoHuan Liu Peng Gong
College of Hydrology and Water Resources, Hohai Univ., Nanjing 210098, P.R.China State Key Laboratory of Resources and Environment Information System, Chinese Academy of Science, Be State Key Laboratory of Remote Sensing Science, Chinese Academy of Science, Beijing 100101 P.R.China
国际会议
北京国际地理信息系统学术讨论会第七届会议（7th International Workshop Geographical Information System
北京
英文
428-434
2007-09-14（万方平台首次上网日期，不代表论文的发表时间）