By using field survey data from the sixth forest inventory of Jiangxi Province in 2003,the biomass and carbon storage for three studied species(Pinus massoniana,Cunninghamia lanceolata,and Pinus elliottii)were estimat...By using field survey data from the sixth forest inventory of Jiangxi Province in 2003,the biomass and carbon storage for three studied species(Pinus massoniana,Cunninghamia lanceolata,and Pinus elliottii)were estimated in Taihe and Xingguo counties of Boyang Lake Basin,Jiangxi Province,China.The relationship between carbon density and forest age was analyzed by logistic equations.Spatio-temporal dynamics of forest biomass and carbon storage in 1985–2003 were also described.The results show that total stand area of the three forest species was 3.10×105ha,total biomass 22.20 Tg,vegetation carbon storage 13.07 Tg C,and average carbon density 42.36 Mg C/ha in the study area in 2003.Carbon storage by forest type in descending order was:P.massoniana,C.lanceolata and P.elliottii.Carbon storage by forest age group in descending order was:middle stand,young stand,near-mature stand and mature stand.Carbon storage by plantation forests was 1.89 times higher than that by natural forests.Carbon density of the three species increased 8.58 Mg C/ha during the study period.The carbon density of Taihe County was higher in the east and west,and lower in the middle.The carbon density of Xingguo County was higher in the northeast and lower in the middle.In general,the carbon density increased with altitude and gradient.Afforestation projects contribute significantly to increasing stand area and carbon storage.Appropriate forest management may improve the carbon sequestration capacity of forest ecosystems.展开更多
基于压力-状态-响应(pressure-state-response,PSR)模型构建了涵盖社会经济、自然资源、生态环境3个准则层的水生态承载力评价指标体系,采用熵权法和变差系数法组合赋权的逼近理想解排序法(technique for order preference by similarit...基于压力-状态-响应(pressure-state-response,PSR)模型构建了涵盖社会经济、自然资源、生态环境3个准则层的水生态承载力评价指标体系,采用熵权法和变差系数法组合赋权的逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)模型综合评价了江西省德安县2012—2018年的水生态承载力状况,利用障碍因子诊断法分析了影响德安县水生态承载力的主要因素。结果表明:德安县水生态承载力总体上处于中级水平,从时间变化趋势上看,2012—2018年德安县水生态承载力呈现出先减小后增大的趋势,其中2015年水生态承载力最低。总的来看,影响德安县水生态承载力的主要障碍因子分别为废水治理措施设施处理能力、第三产业占比、年末总人口、城镇化率、氨氮排放量和第二产业占比。为保障德安县水生态承载力处于一个较好的水平,在今后的发展中需注重优化产业结构,提高废水治理措施设施处理能力,加强水土保持工作。展开更多
基金Under the auspices of Major State Basic Research Development Program of China(No.2009CB421100,2010CB950900)
文摘By using field survey data from the sixth forest inventory of Jiangxi Province in 2003,the biomass and carbon storage for three studied species(Pinus massoniana,Cunninghamia lanceolata,and Pinus elliottii)were estimated in Taihe and Xingguo counties of Boyang Lake Basin,Jiangxi Province,China.The relationship between carbon density and forest age was analyzed by logistic equations.Spatio-temporal dynamics of forest biomass and carbon storage in 1985–2003 were also described.The results show that total stand area of the three forest species was 3.10×105ha,total biomass 22.20 Tg,vegetation carbon storage 13.07 Tg C,and average carbon density 42.36 Mg C/ha in the study area in 2003.Carbon storage by forest type in descending order was:P.massoniana,C.lanceolata and P.elliottii.Carbon storage by forest age group in descending order was:middle stand,young stand,near-mature stand and mature stand.Carbon storage by plantation forests was 1.89 times higher than that by natural forests.Carbon density of the three species increased 8.58 Mg C/ha during the study period.The carbon density of Taihe County was higher in the east and west,and lower in the middle.The carbon density of Xingguo County was higher in the northeast and lower in the middle.In general,the carbon density increased with altitude and gradient.Afforestation projects contribute significantly to increasing stand area and carbon storage.Appropriate forest management may improve the carbon sequestration capacity of forest ecosystems.
文摘基于压力-状态-响应(pressure-state-response,PSR)模型构建了涵盖社会经济、自然资源、生态环境3个准则层的水生态承载力评价指标体系,采用熵权法和变差系数法组合赋权的逼近理想解排序法(technique for order preference by similarity to an ideal solution,TOPSIS)模型综合评价了江西省德安县2012—2018年的水生态承载力状况,利用障碍因子诊断法分析了影响德安县水生态承载力的主要因素。结果表明:德安县水生态承载力总体上处于中级水平,从时间变化趋势上看,2012—2018年德安县水生态承载力呈现出先减小后增大的趋势,其中2015年水生态承载力最低。总的来看,影响德安县水生态承载力的主要障碍因子分别为废水治理措施设施处理能力、第三产业占比、年末总人口、城镇化率、氨氮排放量和第二产业占比。为保障德安县水生态承载力处于一个较好的水平,在今后的发展中需注重优化产业结构,提高废水治理措施设施处理能力,加强水土保持工作。
