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当前位置: 首页 > 文章 > 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 2016,25 (8) 27-35
Position: Home > Articles > Responses of greenhouse gas emissions to water table fluctuations in an alpine wetland on the Qinghai-Tibetan Plateau Acta Prataculturae Sinica 2016,25 (8) 27-35

青藏高原高寒湿地温室气体释放对水位变化的响应

作  者：
王冬雪;高永恒;安小娟;王瑞;谢青琰
单  位：
中国科学院水利部成都山地灾害与环境研究所
关键词：
高寒湿地;水位;温室气体;DOC;全球变化
摘  要：
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,0cm)和波动水位(DW,从0cm下降到45cm,再复原到0cm)]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(0~10cm)可溶性有机碳(DOC)没有显著影响;水位从0cm下降到45cm,再复原到0cm,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209.7g/m~2;3)水位变化对CH4释放有显著影响,CH4累积释放量从SW处理的1.79g/m~2下降到DW处理的0.86g/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-7.36mg/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CH4释放与温度的拟合度。
译  名：
Responses of greenhouse gas emissions to water table fluctuations in an alpine wetland on the Qinghai-Tibetan Plateau
作  者：
WANG Dong-Xue;GAO Yong-Heng;AN Xiao-Juan;WANG Rui;XIE Qing-Yan;Institute of Mountain Hazards and Environment,Chinese Academy of Sciences;
关键词：
alpine wetland;;water table;;greenhouse gases;;DOC;;global change
摘  要：
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 0cm or at soil surface)and dynamic water table(DW;0cm reducing to 45 cm and returning to 0cm).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 235.2and 209.7g/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(0.86g/m~2)decreased by 52.18%,compared with SW(1.79g/m~2).The cumulative emission of N_2O for SW(6.72 mg/m~2)was significantly higher than that for DW(7.36mg/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.

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