珠江三角洲植被对区域碳氧平衡的作用

Roles of Vegetation on Balance of Carbon and Oxygen in the Pearl River Delta

珠江三角洲植被的净生产量为3 855×107t a,碳净固定量为1.822×107t,氧气释放总量为4.860×107t a。而该区域的碳释放总量高达3.600×107t a,是该区植被固碳能力的2.0倍,其中66.05%的碳来源于燃料燃烧。该区的耗氧总量达1.635×108t,是该区植被氧气释放量的3.4倍。这表明珠江三角洲是华南地区的重要碳源。研究结果表明,珠江三角洲植被的生物量和净生产量较低,如能加强植被的保护,提高植被的生物量和净生产量,则区域植被对碳氧平衡的作用会大大提高。

The net primary production(NPP) of vegetation in the Pearl River Delta was 3855×107 t/a.The amounts of fixed carbon and made oxygen by vegetation were respectively 1822×107 t/a and 4860×107 t/a.However,the annual emission of carbon had reached 3600×107 t/a in the region,which means 20 times as much as the amount of fixed carbon by vegetation. 6605% of the carbon came from fuel burning. The oxygen consumption had reached 1635×108 t/a, 34 times as much as the amount of oxygen produced by vegetation.The research showed that the total biomass and NPP of vegetation were low in Pearl River Delta. If the vegetation could be conserved and its biomass and NPP could be increased,its roles on balance of carbon and oxygen could be improved in the Pearl River Delta.