The study showed that freezing and thawing alternation had a significant influence on soil nitrogen pool in the alpine meadow.
上述研究表明，冻融交替对高寒草甸土壤氮素有显著影响。
The dynamics of various soil nitrogen pool after nitrogen fertilizer application at wheat seedling stage was studied by pot experiment and 15n trace technique.
应用盆栽试验和15n标记技术研究了小麦苗期施入N肥后土壤不同N库的动态。
Results showed that energy and materials input were mainly organic. There were surplus of nitrogen, phosphorus and potassium in the farmland soil pool.
结果表明：该农户生态系统能量和物质的投入均以有机为主，农田土壤库中氮、磷、钾均有盈余。
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