<正>Investigations into forest soils face the problem of the high level of spatial variability that is an inherent property of all forest soils.In order to inve
<正>The North China Plain,where summer corn(Zea mays L.)and winter wheat(Triticum aestivum L.)are the major crops grown,is a major agricultural area in China.Pe
<正>At different times over the past 30 years in Zhejiang Province, China, the coastal tidelands have been successively enclosed and reclaimed for agricultural