区域尺度陆地生态系统固碳速率和潜力的定量认证方法是区域碳评估和应对气候变化的基础性工作。基于未来情景的气象、遥感和地面观测等资料,利用DNDC模型评估和预测黑龙江省森林生态系统碳汇总量和未来发展趋势。结果表明:2023-2060年...区域尺度陆地生态系统固碳速率和潜力的定量认证方法是区域碳评估和应对气候变化的基础性工作。基于未来情景的气象、遥感和地面观测等资料,利用DNDC模型评估和预测黑龙江省森林生态系统碳汇总量和未来发展趋势。结果表明:2023-2060年黑龙江省森林植被净初级生产力平均为(548.87±40.14)g C·m^(-2)·yr^(-1),无显著变化趋势,最高值出现在2039年,为607.18 g C·m^(-2)·yr^(-1);土壤异氧呼吸速率平均为(293.67±8.71)g C·m^(-2)·yr^(-1),存在极显著增加趋势,平均增加速率为0.68 g C·m^(-2)·yr^(-1);森林固碳总量介于82.04~122.23 Tg C·yr^(-1),平均为(104.53±10.58)Tg C·yr^(-1),存在一定的增加趋势。黑龙江省森林植被碳吸收能力保持稳定,但土壤异氧呼吸速率的显著增加可能对森林碳汇潜力产生长期影响。研究结果以期为推动区域森林生态系统碳收支评估技术方法的发展做出贡献。展开更多
森林生态系统在调节气候变化和维持碳平衡中具有重要作用。国家森林公园是森林保护的主要载体,探明其碳储量和固碳速率的变化对于森林生态系统的固碳能力评估和可持续经营管理具有重要意义。本研究采用生态系统过程模型CEVSA2模型,模拟...森林生态系统在调节气候变化和维持碳平衡中具有重要作用。国家森林公园是森林保护的主要载体,探明其碳储量和固碳速率的变化对于森林生态系统的固碳能力评估和可持续经营管理具有重要意义。本研究采用生态系统过程模型CEVSA2模型,模拟了1982—2017年中国881处国家森林公园的碳密度、碳储量和固碳速率的空间分布特征。结果表明:国家森林公园平均碳密度为255.18 t C·hm^(-2),高于中国森林生态系统平均碳密度。2017年,国家森林公园总碳储量为3.56 Pg C,占全国森林生态系统总碳储量的11.0%~12.2%。1982—2017年国家森林公园平均固碳速率达到0.45 t C·hm^(-2)·a^(-1),各地区国家森林公园固碳速率都在0.30 t C·hm^(-2)·a^(-1)以上。东北和西南地区国家森林公园的总碳储量最高。东北地区国家森林公园的土壤有机碳固碳速率最高,而华东和中南地区国家森林公园的植被碳固碳速率最高。国家森林公园面积占中国森林总面积的5.8%,在森林碳汇管理中占据着重要地位。准确评估国家森林公园的森林生长状况、固碳潜力和碳吸收特征,可为我国森林公园生态系统服务功能的总体评估提供借鉴和参考。展开更多
The Xiaoxing’an Mountains,located in the temperate monsoon climate zone in Northeast China,have the largest and most complete virgin Korean pine forest in Asia,which has great potential for carbon sequestration.Based...The Xiaoxing’an Mountains,located in the temperate monsoon climate zone in Northeast China,have the largest and most complete virgin Korean pine forest in Asia,which has great potential for carbon sequestration.Based on the observational data of the eddy-covariance system at Wuying National Climate Observatory in January 2015–November 2017,the CO_(2)flux in the forest ecosystem around the observatory was quantitatively studied and the distribution characteristics of the flux source area were analyzed by the Kljun model and the Agroscope Reckenholz–Tänikon footprint tool,providing references for assessing the carbon source/sink potential of the unique forest area.The results showed that the annual total carbon flux around the observatory in 2015,2016,and 2017 was−756.84,−834.73,and−629.37 gC m−2,respectively,higher than that of other forest ecosystems.The forest of the study area in the Xiaoxing’an Mountains was a strong carbon sink,with the strongest carbon fixation capacity in June and weakest in October,and the carbon flux of each month was less than zero.The flux source area under stable atmospheric conditions was larger than that under unstable conditions,and the source area was larger in the nongrowing season than in the growing season.The size of the source area was largest in winter,followed by spring,autumn,and summer.The maximum length of the source area was 1614.12 m(5639.33 m)under unstable(stable)conditions when the flux contribution rate was 90%.The peak flux contribution was located near the sensor(i.e.,within 200 m)in all seasons.The contribution of the source area from the coniferous and broadleaved mixed forest on the west side of the observatory was greater than(3.4 times)that from the Korean pine forest on the east side.展开更多
文摘区域尺度陆地生态系统固碳速率和潜力的定量认证方法是区域碳评估和应对气候变化的基础性工作。基于未来情景的气象、遥感和地面观测等资料,利用DNDC模型评估和预测黑龙江省森林生态系统碳汇总量和未来发展趋势。结果表明:2023-2060年黑龙江省森林植被净初级生产力平均为(548.87±40.14)g C·m^(-2)·yr^(-1),无显著变化趋势,最高值出现在2039年,为607.18 g C·m^(-2)·yr^(-1);土壤异氧呼吸速率平均为(293.67±8.71)g C·m^(-2)·yr^(-1),存在极显著增加趋势,平均增加速率为0.68 g C·m^(-2)·yr^(-1);森林固碳总量介于82.04~122.23 Tg C·yr^(-1),平均为(104.53±10.58)Tg C·yr^(-1),存在一定的增加趋势。黑龙江省森林植被碳吸收能力保持稳定,但土壤异氧呼吸速率的显著增加可能对森林碳汇潜力产生长期影响。研究结果以期为推动区域森林生态系统碳收支评估技术方法的发展做出贡献。
文摘森林生态系统在调节气候变化和维持碳平衡中具有重要作用。国家森林公园是森林保护的主要载体,探明其碳储量和固碳速率的变化对于森林生态系统的固碳能力评估和可持续经营管理具有重要意义。本研究采用生态系统过程模型CEVSA2模型,模拟了1982—2017年中国881处国家森林公园的碳密度、碳储量和固碳速率的空间分布特征。结果表明:国家森林公园平均碳密度为255.18 t C·hm^(-2),高于中国森林生态系统平均碳密度。2017年,国家森林公园总碳储量为3.56 Pg C,占全国森林生态系统总碳储量的11.0%~12.2%。1982—2017年国家森林公园平均固碳速率达到0.45 t C·hm^(-2)·a^(-1),各地区国家森林公园固碳速率都在0.30 t C·hm^(-2)·a^(-1)以上。东北和西南地区国家森林公园的总碳储量最高。东北地区国家森林公园的土壤有机碳固碳速率最高,而华东和中南地区国家森林公园的植被碳固碳速率最高。国家森林公园面积占中国森林总面积的5.8%,在森林碳汇管理中占据着重要地位。准确评估国家森林公园的森林生长状况、固碳潜力和碳吸收特征,可为我国森林公园生态系统服务功能的总体评估提供借鉴和参考。
基金Supported by the National Science and Technology Basic Resources Survey Program of China(2019FY101300)National Natural Science Foundation of China(42141016).
文摘The Xiaoxing’an Mountains,located in the temperate monsoon climate zone in Northeast China,have the largest and most complete virgin Korean pine forest in Asia,which has great potential for carbon sequestration.Based on the observational data of the eddy-covariance system at Wuying National Climate Observatory in January 2015–November 2017,the CO_(2)flux in the forest ecosystem around the observatory was quantitatively studied and the distribution characteristics of the flux source area were analyzed by the Kljun model and the Agroscope Reckenholz–Tänikon footprint tool,providing references for assessing the carbon source/sink potential of the unique forest area.The results showed that the annual total carbon flux around the observatory in 2015,2016,and 2017 was−756.84,−834.73,and−629.37 gC m−2,respectively,higher than that of other forest ecosystems.The forest of the study area in the Xiaoxing’an Mountains was a strong carbon sink,with the strongest carbon fixation capacity in June and weakest in October,and the carbon flux of each month was less than zero.The flux source area under stable atmospheric conditions was larger than that under unstable conditions,and the source area was larger in the nongrowing season than in the growing season.The size of the source area was largest in winter,followed by spring,autumn,and summer.The maximum length of the source area was 1614.12 m(5639.33 m)under unstable(stable)conditions when the flux contribution rate was 90%.The peak flux contribution was located near the sensor(i.e.,within 200 m)in all seasons.The contribution of the source area from the coniferous and broadleaved mixed forest on the west side of the observatory was greater than(3.4 times)that from the Korean pine forest on the east side.
