甘肃省农田生态系统碳收支动态

量化分析了甘肃省兰州、天水、庆阳、定西、金昌和嘉峪关及甘南藏族自治州7个地区的农田生态系统主要作物碳吸收、排放的动态变化。结果显示:研究区2007—2014年的农田生态系统碳吸收总量为1.67~61.18万t,年均增加率3.31%~18.10%。农田生态系统的碳吸收强度最大的是嘉峪关,其次是兰州;碳吸收强度最小的是定西,为0.62 t·hm^-2·a-1。2007—2014年,兰州、天水、庆阳、定西、金昌、嘉峪关、甘南的农田生态系统的年均净碳源强度分别为-0.254、-0.241、-0.196、-0.221、-0.005、0.163、-0.042 t·hm^-2。

Dinamics of Carbon Absorption and Emission of Crops in Gansu,China

The dynamic changes of carbon absorption, carbon emissions, and carbon footprint of major crops in agricultural production in Lanzhou, Tianshui, Qingyang, Dingxi, Jinchang, Jiayuguan city and Gannan Autonomous Prefecture in 2007-2014 were quantitatively analyzed. The main results of the study are summarized as follows:The carbon uptake of farmland ecosystems in the studied areas in 2007-2014 was 1.67-61.18 million tons, with an annual increase rate of 3.31%-18.10%. The largest carbon absorption intensity of farmland ecosystems was in Jiayuguan city, followed by Lanzhou city, while Dingxi City was ranked the carbon absorption intensity with an average of 0.62 t·hm^-2. The annually net carbon absorption for Lanzhou, Tianshui, Qingyang, Dingxi, Jinchang, Jiayuguan and Gannan in 2007-2014 were -0.254, -0.241, -0.196, -0.221, -0.005, 0.163, -0.042 t·hm^-2, respectively.