生态学报2017，Vol.37Issue(9)：2880-2893,14.DOI:10.5846/stxb201601250174
小兴安岭天然森林沼泽湿地生态系统碳源/汇
Carbon source or sink of natural forested wetland ecosystem in Xiaoxing'anling region of China
摘要
Abstract
Carbon (CO2 and CH4) emission fluxes,annual net carbon sequestration of vegetation,were studied from seven kinds of natural wetlands (Carex schmidtii marsh-C,Betula ovalifolia-C,schmidtii shrub swamp-G,Alnus sibirica-C.schmidtii swamp-M,B.platyphylla-C,schmidtii swamp-B,Larix gmelinii-C,schmidtii swamp-L-T,L.gmelinii-moss swampL-X,and L.gmelinii-Sphagnum spp.swamp-L-N) in Xiaoxing'anling region of China using the static chamber gas chromatography method and the relative growth equation method to evaluate the carbon source or sink of natural forested wetlands based on net ecosystem carbon balance.The results showed that:1) seasonal dynamics of CH4 emission fluxes from seven kinds of natural wetlands could be divided into three types (single-peak,multi-peak,and emission and absorption alternating type) and CH4 emission flux (0.006-7.756 mg m-2 h-1) exhibited a different trend in M (which was 1.0-1291.7 times greater than the others,P ＜ 0.05) ＞C,G,B (17.7-649.0 times greater than L-T,L-X,and L-N;P＞ 0.05) ＞L-T,L-X,and L-N;2) seasonal dynamics of CO2 emission fluxes from the seven kinds of natural wetlands could be divided into two types (single-peak and double peak),and CO2 emission flux (157.40-231.06 mg m-2 h-1) exhibited an different trend in G (which was greater 28.7％-46.8％ than forested wetlands,P ＜ 0.05) ＞ C (7.4％-22.5％ than forested wetlands,P＞0.05) ＞five kinds of forested wetlands;3)CH4 emission fluxes from C,G,M,B,and L-N were controlled by soil temperature,but that of L-T and L-X had no significant correlation with soil temperature at 0-40 cm.CO2 emission fluxes from C,G,M,and L-T were controlled by air temperature and soil temperature,and that of B,L-X,and L-N were controlled by air temperature,soil temperature,and the water table level;4) the annual net carbon sequestration of vegetation ((2.05±0.09)-(6.75±0.27) tC hm-2 a-1) had a different trend in C (greater than the others by 65.4％-229.3％,P ＜ 0.05)＞G,B,L-T,L-X,and L-N (greater than M by 80.0％-99.0％,P ＜ 0.05) ＞M;and 5) the sources and sinks of carbon were significantly different among the seven kinds of natural wetland types (-2.32-2.09 tC hm-2 a-1).For example,C,B,and L-N exhibited varying degrees of carbon sinks,yet M,G,L-T,and L-X exhibited varying degrees of carbon sources.Therefore,marsh wetlands were greater carbon sinks and shrub wetlands were greater carbon sources,yet forested wetlands maintained overall carbon balance (except M) in the Xiaoxing'anling region of China.关键词
小兴安岭/天然沼泽湿地/温室气体排放/年净固碳量/碳源/汇Key words
Xiaoxing'anling/natural wetlands/carbon emission/carbon sequestration/carbon source/sink引用本文复制引用
李娜,牟长城,王彪,张妍,马莉..小兴安岭天然森林沼泽湿地生态系统碳源/汇[J].生态学报,2017,37(9):2880-2893,14.基金项目
国家自然科学基金项目(31370461) （31370461）
