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采用封顶埋管-原位培养和淋溶水原位收集法对川西亚高山岷江冷杉林不同厚度雪被梯度(浅雪被、中度厚度雪被和厚雪被)下冬季土壤净氮素矿化量和氮淋溶进行估算。结果表明:土壤温度随雪被厚度的降低而降低;冬季土壤净硝化量明显大于净氨化量,且决定着净氮矿化量;土壤净氨化量、净硝化量和净氮矿化量均随雪被厚度的降低而升高;川西亚高山冷杉林冬季土壤铵态氮、硝态氮及可溶性有机氮的淋溶量分别为0.07,0.58,0.42g/m2,分别占冬季土壤氮素淋溶量的6.88%,53.62%和39.50%;中度厚度雪被土壤氮淋溶量最大,但总体上不同厚度雪被间差异不显著。综上所述,未来气候变化所引发季节性雪被减少可能会降低该林区冬季土壤温度,增加土壤冻融循环,进而提高冬季土壤净氮矿化量和早春土壤氮淋溶。
In-situ incubation of capped soil and in situ collection of leaching water were used to evaluate the effects of different concentrations of snow on the net thickness of winter wheat nitrogen Quantification and nitrogen leaching were estimated. The results showed that soil temperature decreased with the decrease of snow thickness. Net soil nitrification in winter was significantly greater than that of net ammoniation, and determined net nitrogen mineralization, net soil ammonification, net nitrification and net nitrogen mineralization The leaching amount of soil ammonium nitrogen, nitrate nitrogen and dissolved organic nitrogen in the fir-firtree forests in sub-alpine forests in western Sichuan were 0.07,0.58 and 0.42g / m2 respectively, accounting for the difference in winter soil nitrogen Leaching amount of 6.88%, 53.62% and 39.50%; moderate thickness of snow was the largest amount of soil nitrogen leaching, but the overall thickness of the snow was no significant difference between. In summary, the reduction of seasonal snow caused by climate change in the future may reduce the soil temperature in winter and increase the soil freeze-thaw cycle, so as to increase the amount of net nitrogen mineralization in winter and the soil nitrogen leaching in early spring.