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Alternative TitleResponses of greenhouse gas emissions to water table fluctuations in an alpine wetland on the Qinghai-Tibetan Plateau
王冬雪; 高永恒; 安小娟; 王瑞; 谢青琰
Corresponding Author高永恒
Source Publication草业学报

为了探究水位变化对青藏高原高寒湿地温室气体释放的影响,以高原东部若尔盖典型高寒湿地为研究对象,采用"中型实验生态系"的技术手段,研究了两种不同水位情形[稳定水位(SW,0 cm)和波动水位(DW,从0 cm下降到45 cm,再复原到0 cm)]对高寒湿地二氧化碳(CO_2)、甲烷(CH_4)和氧化亚氮(N_2O)三种温室气体释放的影响。结果表明,1)高寒湿地水位变化对土壤(0~10 cm)可溶性有机碳(DOC)没有显著影响;水位从0 cm下降到45 cm,再复原到0 cm,对铵态氮(NH_4~+-N)和硝态氮(NO_3~--N)的转化起到了促进作用;2)水位变化对高寒湿地CO_2释放影响不显著,SW和DW处理下CO_2累积释放量分别为235.2和209.7 g/m~2;3)水位变化对CH_4释放有显著影响,CH_4累积释放量从SW处理的1.79 g/m~2下降到DW处理的0.86 g/m~2,下降了52.18%;4)水位波动处理抑制了N_2O的释放,其在SW和DW条件下的累积释放量分别是6.72和-7.36 mg/m~2;5)高寒湿地土壤温度在10 ℃以上,CO_2和CH_4释放量与其呈显著正相关性,水位下降提高了CO_2和CH_4释放与温度的拟合度。

Other Abstract

A mesocosm experiment was conducted to study the effect of water table level on greenhouse gas (CO_2, CH_4, N_2O) emissions in alpine wetland on the Qinghai-Tibetan Plateau. Two treatments were adopted; stable water table (SW; about 0 cm or at soil surface) and dynamic water table (DW; 0 cm reducing to 45 cm and returning to 0 cm). The results showed that alpine wetland water table changes had no significant effect on soil dissolved organic carbon (DOC), but promoted transformations of ammonium (NH_4~+-N) and nitrate (NO_3~--N). The cumulative emissions of CO_2 were 235.2 and 209.7 g/m~2 for SW and DW treatment, respectively but were not significantly different. However, there was a significant treatment difference on CH_4 emissions. Cumulative emission of CH_4 for DW (0.86 g/m~2) decreased by 52.18%, compared with SW (1.79 g/m~2). The cumulative emission of N_2O for SW (6.72 mg/m~2) was significantly higher than that for DW (7.36 mg/m~2). There was a positive correlation between CO_2/CH_4 release and soil temperature in the alpine wetland with soil temperatures below about 10 ℃. The drop in the water table increased the sensitivity of CO_2/CH_4 release to soil temperature. Models of the response of CO_2, CH_4 and N_2O emissions to water table changes were different in alpine wetland on the Qinghai-Tibetan Plateau.

Keyword高寒湿地 水位 温室气体 Doc 全球变化
Indexed ByCSCD ; 北大中文核心
Citation statistics
Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
Recommended Citation
GB/T 7714
王冬雪,高永恒,安小娟,等. 青藏高原高寒湿地温室气体释放对水位变化的响应[J]. 草业学报,2016,25(8):27-35.
APA 王冬雪,高永恒,安小娟,王瑞,&谢青琰.(2016).青藏高原高寒湿地温室气体释放对水位变化的响应.草业学报,25(8),27-35.
MLA 王冬雪,et al."青藏高原高寒湿地温室气体释放对水位变化的响应".草业学报 25.8(2016):27-35.
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