| Wetland is the unique ecosystem that interaction of water and terrestrial on the earth, because of environment stability, protected species genes, and resource utilization, the wetland with the forest and the ocean as three largest ecosystems of the world in the conservation program. Fire disturbance plays an important role in the process of development and evolution of the wetland ecosystem. So we select Daxing’an Moutain that fire disturbance frequently as study area, taking Larix gmelinii-Carex schmidtii forested wetlands as the research object, establishing9standard type sites (20x30m2), by comparative analysis of vegetation carbon storage, litter carbon storage and soil carbon storage of different fire disturbance intensity (unburned site, light burned site and heavily burned site), in order to reveal the short-term effects of fire disturbance on carbon storage of forested wetlands ecosystem, then quantitative evaluation the fire effects of forested wetland ecosystem to provide theory basis. Results showed that:(1)Daxing’an Moutain Larix gmelinii-Carex schmidtii forested wetlands ecosystems vegetation carbon storage was62.92±12.31t C·hm-2, vegetation carbon storage of light burned site and heavily burned site were62.57±8.27t·hm-2 and2.94±0.61t C·hm-2. Light burned site deceased vegetation carbon storage (0.6%or0.35t C·hm-2), but not significantly; heavily burned site significantly deceased vegetation carbon storage (95.3%or60.0t C·hm-2), and it took on decreased trends with the fire disturbance intensity increased.(2)Daxing’an Moutain Larix gmelinii-Carex schmidtii forested wetlands ecosystems litter carbon storage was3.45±0.96t C·hm-2, litter carbon storage of light burned site and heavily burned site were2.32±0.88and1.48±0.66t C·hm-2. Light burned site deceased litter carbon storage (32.8%or1.13t C·hm-2), but not significantly; heavily burned site deceased litter carbon storage (57.1%or1.97t C·hm-2), and it also took on decreased trends with the fire disturbance intensity increased.(3)Daxing’an Moutain Larix gmelinii-Carex schmidtii forested wetlands ecosystems soil carbon storage was230.9±5.3t C·hm-2, the soil carbon storage of light burned site and heavily burned site were154.6±12.3t C·hm-2、63.3±28.6t C·hm-2. Light burned site and heavily burned site were both significantly deceased the soil carbon storage (decreased by33.0%or76.3t C·hm-2and29.3%or67.6t C·hm-2), and it influenced similarly.(4) Daxing’an Moutain Larix gmelinii-Carex schmidtii forested wetlands ecosystems was297.27±25.83t C·hm-2, light burned site and heavily burned site forested wetlands ecosystem were219.49±13.89t C·hm-2and167.72±25.09t C·hm-2. Light burned site deceased forested wetlands ecosystems carbon storage (26.2%or77.78t C·hm-2), but not significantly; heavily burned site significantly deceased it (43.6%or129.55t C·hm-2), because of light fire mainly decreased soil carbon storage, but heavily burned significantly decreased vegetation carbon storage, litter carbon storage and soil carbon storage, so heavily fire influenced significantly than light fire.(5)The net primary productivity and carbon sequestration ability of Daxing’an Moutain Larix gmelinii-Carex schmidtii forested wetlands ecosystems、light burned site and heavily burned site were5.7±2.62、8.47±2.69、4.44±1.44t·hm-2·a-1and2.71±1.43、3.68±1.17、1.66±0.31t·C·hm-2-a-1’. The light fire increased vegetation net primary productivity (48.6%or2.77t·hm-2·a-1) and carbon sequestration ability (35.8%or0.79t·C·hm-2·a-1), the heavily fire significantly decreased vegetation net primary productivity by (22.1%or1.26t·hm·2a-1) and carbon sequestration ability (38.8%or1.05t·C·hm-2·a-1). The net primary productivity and carbon sequestration ability of light burned site and heavily burned site were not significantly different. But it existed significantly difference between light burned site and heavily burned site. So light fire disturbance can promote to maintain carbon sequestration ability. |
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