發(fā)布時(shí)間：2018-11-08 19:32

【摘要】：季節(jié)性雪被是高寒森林冬季土壤呼吸的重要調(diào)控因子,氣候變化導(dǎo)致的季節(jié)性雪被減少可能對高寒森林冬季土壤呼吸產(chǎn)生顯著影響。該研究采用人工去除雪被的方法,研究雪被去除對川西亞高山云杉(Picea asperata)人工林冬季土壤呼吸的影響。結(jié)果表明:與對照相比,雪被去除加大了土壤溫度波動,使冬季土壤表層和5 cm平均溫度分別降低了1.12和0.34℃,凍融循環(huán)次數(shù)分別增加了39和12次;冬季平均土壤呼吸速率和土壤碳排放通量分別為0.52μmol·m~( 2)·s~( 1)和88.44 g·m~( 2),雪被去除使冬季平均土壤呼吸速率和碳排放通量分別降低了21.02%和25.99%,雪被效應(yīng)主要發(fā)生在雪被初期;冬季土壤呼吸與土壤溫度存在顯著的指數(shù)關(guān)系,雪被去除顯著降低了冬季土壤呼吸溫度敏感性。未來氣候變化所引發(fā)的季節(jié)性雪被減少可能會降低川西亞高山森林冬季土壤碳排放,從而對亞高山森林土壤碳動態(tài)產(chǎn)生深遠(yuǎn)影響。
[Abstract]:Seasonal snow cover is an important regulating factor of winter soil respiration in alpine forest. The decrease of seasonal snow caused by climate change may have a significant effect on winter soil respiration in alpine forest. In this study, the effects of snow removal on soil respiration in winter of (Picea asperata) plantation in western Sichuan were studied. The results showed that compared with the control, snow removal increased the fluctuation of soil temperature, reduced the average temperature of soil surface and 5 cm in winter by 1.12 鈩，

本文編號：2319448