贵州省是我国重要的烤烟生产基地，而黄壤又是当地的主要地带性土壤。
Guizhou was an important tobacco producing province in China, widespread yellow earths, the main zonal soils.
土壤微生物量C、N从北到南的地带性变化规律不强。
The zone change of soil microbial biomass C and N from north to south was not distinct.
黑垆土是我国西北黄土侵蚀地区主要的地带性土类，也是一种古老的耕种土壤。
The dark loessial soil (Heilutu) is not only a main zonal soil group in the loess plateau of northwestern China, but an ancient cultivated soil.
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