Abstract
This article estimated the size of carbon sink, emission, net carbon farmland ecosystem in China costal regions (including ten provinces) with statistic data from 1990 to 2010(which include crop yield and agricultural consumptions). Conclusions are as following: (1) the total carbon sink, emission and net of farmland ecosystem in China costal regions all increased since 1990. Carbon is obviously more than carbon emission, for example, total carbon in 2010 is 3 times more than carbon emission, which showed that the costal region is generally a sink region. While, because the increasing rate of carbon emission (265%) exceeded that of carbon (44%), the carbon function of farmland ecosystem in China costal regions will be saturated within several decades. (2) There were significant temporal-spatial differences in carbon sink, emission and net among different costal regions. Further, there are also differences in per area carbon sink, emission and net among different costal regions. The total and per area carbon emission increased year by year from 1990, while that of carbon and net changed drastically. The total carbon and net in relative developed regions has a down trend from 1990 to 2010. a special example: carbon emission exceeded carbon and caused that net carbon and per area net carbon was negative in 2010 in Shanghai, which indicated that Shanghai has been a carbon source region in 2010 because the decrease of cropland and increase of agricultural consumptions. (3) The proportion of carbon sinks in the main crops of farmland ecosystem in China costal regions compared with that of the whole nation decreased since 1990, which indicate that with the decrease of cropland and increase of agricultural consumptions, the carbon function of costal farmland is weaken.
Published Version
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