Title: Carbon Sink of Forest Ecosystem Driven by NPP Increasing in China
Abstract:Forest ecosystem could significantly sequestrate some atmospheric CO2 and,therefore,partly mitigate current pressure on global warming.The carbon sequestration capacity of forest ecosystem is determin...Forest ecosystem could significantly sequestrate some atmospheric CO2 and,therefore,partly mitigate current pressure on global warming.The carbon sequestration capacity of forest ecosystem is determined by both the NPP increasing trend and carbon turnover time.In order to estimate the capability of forest C sequestration in China,a carbon turnover model based on NPP increasing trend monitored by remote sensing and carbon turnover time derived from forest observed data,was designed.In this model,the maximum light-use efficiency of NPP monitored by remote sensing was revised by plot observed NPP firstly.The revised NPP entered different pools of forest ecosystem according to the ratio of distribution.Some stayed in the carbon pool,while the others decomposed by heterotrophic respiration.The decomposition rate was determined by carbon turnover time.We simulated the carbon sink and annual change of forest ecosystem from 1982 to 1999 in China.Results illustrated that from 1982 to 1999,China forest ecosystem was an apparent carbon sink with a magnitude of 0.051 PgC a-1,in which about 0.034 PgC a-1 in plant tissues,0.013 PgC a-1 in litter fall,and 0.004 PgC a-1 in soil.For different forests,the carbon sinks of ENF and EBF were the largest,while the smallest ones were in DNF and BNMF.The further analysis on carbon sequestration efficiency(CSE) indicated that the CSE value was controlled by carbon turnover time.From largest to smallest,the CSE was ENFBNMFEBFDBFDNF.Read More
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 10
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