土壤中的氮素主要以有机氮的形式存在于土壤有机质中， 土壤碳氮比与有机质含量显著相关。
The N in the SOM existed mainly in the form of organic nitrogen, and the soil C:N was significantly correlated with SOM.
结果表明，全氮、碱解氮和有机质是黄土丘陵区人工林土壤主要的肥力指标，其含量能更好地反映土壤肥力状况。
The results showed that total nitrogen, available nitrogen and organic matter were the main fertility indicators for soil fertility evaluation in the planted forest land on the Loess Plateau.
与腐殖质组成成分最为密切的农化性状是全氮和碱解氮，其次是速效磷；
It was found that chemical properties closely related to humus compositions were the total and arailable nitrogen, and fast phosphorus.
灌水对土壤矿质氮、有机质和全氮含量无显著影响，但有利于土壤有机氮的矿化。
Also, irrigation had no obvious effect on the contents of mineral n, organic matter and total n, but it was beneficial to the mineralization of organic n.
且土壤有机质、全氮、酸水解性总氮、氨基酸态氮和碱解氮含量按照石漠化程度的由轻度到极强度而呈递减趋势，但土壤其他氮素含量并未表现相同的变异规律。
Compared with Karst no-Rocky Desertification soil, the content of soil Organic Matter and Nitrogen in various degrees of Karst Rocky Desertification shows a tendency to drop suddenly.
且土壤有机质、全氮、酸水解性总氮、氨基酸态氮和碱解氮含量按照石漠化程度的由轻度到极强度而呈递减趋势，但土壤其他氮素含量并未表现相同的变异规律。
Compared with Karst no-Rocky Desertification soil, the content of soil Organic Matter and Nitrogen in various degrees of Karst Rocky Desertification shows a tendency to drop suddenly.
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