城市湿地毛竹林土壤二氧化碳通量研究
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摘要
为了解城市湿地典型基塘系统的土壤二氧化碳(CO_2)通量特征,以杭州西溪国家湿地公园毛竹林为主要研究对象,通过静态箱式法进行土壤CO_2的通量观测。结果表明:西溪湿地毛竹林土壤是CO_2的排放源,为单峰型,CO_2通量最小值出现在冬季1月,为(127.41±24.06)mg·m~(-2)·h~(-1),最大值出现在夏季的9月,为(537.21±41.12)mg·m~(-2)·h~(-1),是1月最小通量的4倍多,全年毛竹林土壤CO_2的累积排放量为3 366.29 g·m~(-2)·a~(-1)。西溪湿地毛竹林土壤CO_2通量与10 cm土壤温度、0~20 cm土壤含水量有显著相关性,与土壤有机碳质量分数呈负相关。
In order to better understand the soil CO_2flux of typical dike-pond ecosystem in urban wetlands,the seasonal variation of soil CO_2flux in moso bamboo(Phyllostachys edulis)forest in Hangzhou Xixi National Wetland Park were investigated by using the static chambergas chromatography method.The results showed that the moso bamboo forest in Xixi Wetland acted as a source of CO_2.The flux of soil CO_2followed a unimodal distribution,with the minimum(127.41±24.06)mg·m~(-2)·h~(-1)in January and maximum(537.21±41.12)mg·m~(-2)·h~(-1)in September.The cumulative soil CO_2emission was 3 366.29 g·m~(-2)·a~(-1).There was a significantly positive relationship between the soil CO_2flux and the underground soil temperature at the depth of 10 cm.The relationship between soil CO_2flux and soil water content at the depth of 0-20 cm was also significant.However,there was a significantly negative relationship between the soil CO_2flux and soil organic C content.
In order to better understand the soil CO_2flux of typical dike-pond ecosystem in urban wetlands,the seasonal variation of soil CO_2flux in moso bamboo(Phyllostachys edulis)forest in Hangzhou Xixi National Wetland Park were investigated by using the static chambergas chromatography method.The results showed that the moso bamboo forest in Xixi Wetland acted as a source of CO_2.The flux of soil CO_2followed a unimodal distribution,with the minimum(127.41±24.06)mg·m~(-2)·h~(-1)in January and maximum(537.21±41.12)mg·m~(-2)·h~(-1)in September.The cumulative soil CO_2emission was 3 366.29 g·m~(-2)·a~(-1).There was a significantly positive relationship between the soil CO_2flux and the underground soil temperature at the depth of 10 cm.The relationship between soil CO_2flux and soil water content at the depth of 0-20 cm was also significant.However,there was a significantly negative relationship between the soil CO_2flux and soil organic C content.
引文
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[3]郭程轩,徐颂军.中国基塘系统研究进展与新视角[J].湿地科学,2011,9(1):75-81.
[4]谭三清,康文星,何介南,等.洞庭湖白沙洲4种植被系统与大气中碳素交换[J].生态学报,2010,30(13):3441-3448.
[5]WICKLAND K P.Carbon gas exchange at a southern Rocky Mountain wetland,1996-1998[J].Global Biogeochemical Cycles,2001,15(2):32l-335.
[6]DREWITT G B,BLACK T A,NESIC Z,et al.Measuring forest floor CO2fluxes in a Douglas-fir forest[J].Agriculture and Forest Meteorology,2002,110(4):299-317.
[7]HATALA J A,DETTO M,SONNENTAG O,et al.Greenhouse gas(CO2,CH4,N2O)fluxes from drained and flooded agricultural peatlands in the Sacramento-San Joaquin Delta[J].Agriculture,Ecosystems and Environment,2012,150(6):1-18.
[8]覃思月,唐俊红,普静云,等.杭州西溪湿地CH4、CO2通量及其主要影响因子[J].地球与科学,2016,44(5):513-519.
[9]杨文佳,李永夫,姜培坤,等.亚热带毛竹人工林土壤呼吸组分动态变化及其影响因素[J].应用生态学报,2015,26(10):2937-2945.
[10]高洁,董辰,李永伟,等.城市园林绿地土壤CO2排放通量的研究[J].西南大学学报(自然科学版),2014,36(3):109-116.
[11]叶耿平,刘娟,姜培坤,等.集约经营措施对毛竹林生长季土壤呼吸的影响[J].浙江农林大学学报,2011,28(1):18-25.
[12]SCHLESINGER W H,ANDREWS J A.Soil respiration and the global carbon cycle[J].Biogeochemistry,2000,48(1):7-20.
[13]WAGAI R,BRYE K R,GOWER S T,et al.Land use and environmental factors influencing soil surface CO2flux and microbial biomass in natural and managed ecosystems in Southern Wisconsin[J].Soil Biology and Biochemistry,1998,30(12):1501-1509.
[14]唐晓鹿,范少辉,漆良华,等.采伐对幕布山区毛竹林土壤呼吸的影响[J].林业科学研究,2013,26(1):52-57.
[15]李雅红,江洪,原焕英,等.西天目山毛竹林土壤呼吸特征及其影响因子[J].生态学报,2010,30(17):4590-4597.
[16]初小静,韩广轩.气温和降雨量对中国湿地生态系统CO2交换的影响[J].应用生态学报,2015,26(10):2978-2990.
[17]BOWLES T M,ACOSTA M V,CALDERON F,et al.Soil enzyme activities,microbial communities,and carbon and nitrogen availability in organic agroecosystems across an intensively managed agricultural landscape[J].Soil Biology and Biochemistry,2014,68(1):252-262.
[18]SHENG H,YANG Y S,YANG Z J,et al.The dynamic response of soil respiration to land-use changes in subtropical China[J].Global Change Biology,2010,16(3):1107-1121.