Research on the temporal-spatial differences of carbon sources and sinks of farmland ecosystems of Hexi oasis in Gansu

Abstract

Abstract: Temporal-spatial differences of carbon sources and sinks of farmland ecosystems of Hexi oasis in Gansu in 1949-2005 were studied. 1) Carbon absorption of farmland ecosystems showed an increasing trend from 243.9 thousand tons in 1949 to 2 983.7 thousand tons in 2005, a net increase of 2 739.8 thousand tons (a 12.23 fold increase). 2) Carbon emissions from the farmland ecosystem of the Hexi oasis in Gansu in 1949-2005 showed a rapid, increasing trend from 2.5 thousand tons in 1949 to 757 thousand tons in 2005, a net increase of 754.5 thousand tons (a 302.8 fold increase). Fertilizer use played a leading role, and showed a rapid increase. Carbon emissions from agricultural machinery were low on the smooth terrain. 3) There was an increasing trend of net carbon sink in the farmland ecosystems of the Hexi oasis in Gansu in 1949-2005. Carbon absorption was more than carbon emission of these farmlands and farmland ecosystems had a large carbon sink capability. However, the increasing speeds of carbon emissions compared with carbon absorption do not give a reason for optimism.

CLC Number:

S181
Q14

XIE Peng, LIN Hai-ming, HUANG Gao-bao, WANG Long-qiang, CHAI Qiang. Research on the temporal-spatial differences of carbon sources and sinks of farmland ecosystems of Hexi oasis in Gansu[J]. Acta Prataculturae Sinica, 2009, 18(4): 224-229.

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