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基于上海市区航片数字化、代表性样地群落调查、优势树种生理参数测定和CITYgreen模型软件,对上海城市森林固碳能力进行评估,并探讨群落结构对固碳能力的影响。结果表明:上海城市森林总碳贮量为478472t,年碳固定量为6256t.a-1,平均碳密度为47.80t.hm-2,平均固碳率为0.625t.hm-2.a-1;城市森林的固碳率与郁闭度及群落密度均呈极显著正相关,而与平均胸径负相关;碳密度与郁闭度及平均胸径均呈极显著正相关,而与群落密度无显著相关;低密度高胸径群落比中、高密度群落具有更高的碳密度;混交林碳密度高于纯林,复层林碳密度和固碳率都高于单层林,且固碳能力的差异在一定程度上受平均胸径、群落密度等因子影响。
The urban carbon sequestration of Shanghai city was evaluated based on the digitalization of aerial photos in China, the investigation of representative sample plots, the physiological parameters of dominant species and the CITYgreen model software. The effects of community structure on carbon sequestration were also discussed. The results showed that the total carbon storage in Shanghai urban forest was 478472t, the annual carbon fixation was 6256t.a-1, the average carbon density was 47.80t.hm-2, and the average carbon sequestration rate was 0.625t.hm-2.a-1 . The carbon sequestration of urban forest was highly significant positive correlation with canopy density and community density, but negatively correlated with average DBH. The carbon density was significantly and positively correlated with canopy density and average DBH but not with community density The density of high density DBH community had higher carbon density than that of middle and high density community. The carbon density of mixed forest was higher than that of pure forest, and the carbon density and carbon sequestration rate of multilevel forest were higher than single layer forest, and the difference of carbon sequestration ability To some extent affected by the average diameter at breast height, community density and other factors.