雪被去除对川西亚高山云杉林土壤活性氮的影响

发布时间：2018-05-12 23:38

  本文选题：雪被去除 + 冻融循环　； 参考：《应用生态学报》2017年06期

【摘要】：气候变化引发的季节性雪被改变可能对高寒森林土壤氮循环产生深刻影响.以遮雪棚去除雪被,研究了雪被去除样方和对照样方在不同关键时期(雪被初期、深雪被期和雪被融化期)土壤氮库和矿化速率的变化.结果表明:季节性雪被对土壤具有良好的保温作用,雪被去除使得5 cm深度土壤平均温度和最低温度分别降低0.33和1.17℃,并明显增加了土壤冻结深度和冻融循环.土壤活性氮在不同雪被时期存在显著差异.雪被去除使得冬季土壤铵态氮、硝态氮和可溶性有机氮增加38.6%、23.5%和57.3%.此外,雪被去除也促进了融化期土壤硝化和矿化速率的增加.因此,未来气候变暖引起的雪被减少可能加快川西亚高山森林冬季土壤氮循环.
[Abstract]:Changes in seasonal snow caused by climate change may have a profound impact on the nitrogen cycle in alpine forest soils. The changes of soil nitrogen pool and mineralization rate in different critical periods (early snow cover, deep snow cover and melting snow) were studied in order to remove snow cover from snow shed. The results showed that the seasonal snow cover had a good heat preservation effect on the soil. The average temperature and minimum temperature of the soil at 5 cm depth were decreased by 0.33 and 1.17 鈩，

本文编号：1880683