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以喀什地区疏附县尔库萨克乡盐渍化土壤为试材,采用原位模拟方法,研究了不同氮素沉降水平对土壤氮素矿化的影响。结果表明:氮素的沉降量达到1.0g·m~(-2)·a~(-1)时,是土壤铵态氮含量的最佳阈值;氮素的氨化率达到0.5g·m~(-2)·a~(-1)时,是土壤氨化率的最佳阈值;当氮素的沉降量达到3.0g·m~(-2)·a~(-1)时为土壤硝化及矿化的最佳阈值。盐渍化土壤铵态氮含量及土壤氮素氨化率均是在20~40cm土层达到最大值,而硝态氮含量、硝化率、矿质氮含量、矿化率均是在表层(0~20cm)达到最大值,由此说明,土壤表层(0~20cm)矿化及硝化作用更快。
Taking the soil salinized in Erkussac County, Kushu County, Kashgar Prefecture as test material, the effect of different nitrogen deposition levels on soil nitrogen mineralization was studied by in situ simulation. The results showed that when the amount of nitrogen deposition reached 1.0 g · m -2 · a -1, the optimum threshold value of soil ammonium nitrogen content was reached. The ammoniation rate of nitrogen reached 0.5 g · m ~ (-2) · a ~ (-1), it is the best threshold for soil ammonification rate. When the amount of nitrogen deposition reached 3.0g · m -2 · a -1, soil nitrification And mineralization of the best threshold. The content of ammonium nitrogen in soil salinization and the rate of nitrogen ammoniation in soil were the highest in 20 ~ 40cm soil layer, while the content of nitrate nitrogen, nitrification rate, mineral nitrogen content and mineralization rate were all in the surface layer (0 ~ 20cm) reached the maximum, indicating that the soil surface (0 ~ 20cm) mineralization and nitrification faster.