土娄土、黑垆土脲酶活性与时间及土壤缓冲量之间的关系为二元线性回归方程。
The equation among Lou soil and Heilu soil urease activity and time and their buffering values is quadratic linear regression equation.
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.
黄土是在相对冷干气候条件下发育的成熟的灰黄色古土壤，不同地区黄土所属土壤类型主要为灰钙土、栗钙土、棕钙土、棕漠土和黑垆土。
But compared with reddish paleosols, it was formed in dry and cold conditions, so, loess even could serve as an indicator of dry and cold climate.
黄土是在相对冷干气候条件下发育的成熟的灰黄色古土壤，不同地区黄土所属土壤类型主要为灰钙土、栗钙土、棕钙土、棕漠土和黑垆土。
But compared with reddish paleosols, it was formed in dry and cold conditions, so, loess even could serve as an indicator of dry and cold climate.
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