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气候变暖导致的雪被动态格局变化可能深刻影响高山森林生态过程.为了解气候变暖背景下雪被的减少对川西高山森林土壤生态过程的影响,2009年10月19日—2010年5月18日,采用遮雪方法,研究了雪被去除对该区冷杉原始林土壤温度和碳、氮、磷的影响.结果表明:雪被去除加大了土温日变化幅度和冻融循环频次,使土壤冻结和融化时间提前.雪被去除使土壤可溶性碳和可溶性氮、有效磷、铵态氮和硝态氮冬季含量高峰提前到雪被覆盖期;雪被覆盖期至融化期的可溶性碳和氮及硝态氮含量增加,但有效磷和铵态氮含量降低,改变了其组分比例.气候变暖引起的川西高山森林雪被减少将改变土壤外部环境条件,进而影响土壤碳、氮和磷过程.
The dynamic change of snow caused by climate change may have a profound impact on the alpine forest ecological process.In order to understand the impact of the reduction of snow cover on the soil ecological process in the alpine forest in western Sichuan under the background of climate warming, from October 19, 2009 to May 2010 The effect of snow removal on the soil temperature, carbon, nitrogen and phosphorus in Fir forests of this area was studied on the 18th by the snow cover method.The results showed that: the removal of snow increased the diurnal variation of soil temperature and the frequency of freeze-thaw cycles, So that soil freezing and thawing time ahead of the advance of the snow was removed so that soil soluble carbon and soluble nitrogen, available phosphorus, ammonium nitrogen and nitrate nitrogen winter peaked ahead of the snow coverage period; snow was covered during the melting period of soluble carbon and Nitrogen and nitrate nitrogen content increased, but available phosphorus and ammonium nitrogen content decreased, changing the proportion of its components.Chernochic alpine forest snow caused by climate warming is reduced will change the soil external environmental conditions, thereby affecting the soil carbon, nitrogen and Phosphorus process.