广东新会地区耕地土壤肥力指标的时空变异性

运用地统计学，结合GIS技术研究了近20年广东新会地区土壤pH值、有机质、全氮和全磷等4种土壤肥力指标的时空变异规律.样本的t检验以及Kriging插值结果表明，2003年调查的土壤pH值和有机质含量比1982年显著减小，而全氮和全磷含量显著增加.4种土壤肥力指标的空间分布特征也不同程度地发生了变化.研究区域大部分地区pH值呈减小趋势；研究区域中部银洲湖两岸、南部和西北部的部分地区有机质含量呈升高趋势，其余地区呈降低趋势；研究区域的大部分地区全氮含量呈增加趋势；整个研究区域全磷含量基本上呈增加趋势.

Spatiotemporal variability of soil fertility parameters in Xinhui District of Guangdong Province.

By the methods of geostatistics and GIS, this paper studied the spatial distribution patterns of pH, organic matter, total nitrogen (N) and total phosphorus (P) in cultivated soils of Xinhui District, Guangdong Province from 1982 to 2003. The paired samples t test and Kriging results showed that soil pH and organic matter content were significantly lower in 2003 than in 1982, while the contents of soil total N and total P were in adverse. The spatial distribution of test parameters changed to different degrees over the past 20 years. Soil pH tended to decrease in most areas of the study district, soil organic matter decreased except at the banks of Yinzhou Lake and parts of south and northwest, soil total N increased in most areas except the parts of east and northwest, and soil total P increased in most areas.