本文選題：雪被去除 + 凍融循環(huán)　； 參考：《應用生態(tài)學報》2017年06期

【摘要】：氣候變化引發(fā)的季節(jié)性雪被改變可能對高寒森林土壤氮循環(huán)產(chǎn)生深刻影響.以遮雪棚去除雪被,研究了雪被去除樣方和對照樣方在不同關(guān)鍵時期(雪被初期、深雪被期和雪被融化期)土壤氮庫和礦化速率的變化.結(jié)果表明:季節(jié)性雪被對土壤具有良好的保溫作用,雪被去除使得5 cm深度土壤平均溫度和最低溫度分別降低0.33和1.17℃,并明顯增加了土壤凍結(jié)深度和凍融循環(huán).土壤活性氮在不同雪被時期存在顯著差異.雪被去除使得冬季土壤銨態(tài)氮、硝態(tài)氮和可溶性有機氮增加38.6%、23.5%和57.3%.此外,雪被去除也促進了融化期土壤硝化和礦化速率的增加.因此,未來氣候變暖引起的雪被減少可能加快川西亞高山森林冬季土壤氮循環(huán).
[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，

本文編號：1880683