Quantifying carbon input for targeted soil organic carbon sequestration in China's croplands
Quantifying carbon input for targeted soil organic carbon sequestration in China's croplands
复制标题
量化中国农田目标土壤有机碳固存的碳输入
DOI：
10.1007/s11104-015-2508-3
复制
发表时间：
2015
期刊：
影响因子：
4.9
通讯作者：
Sun Wenjuan
中科院分区：
文献类型：
--
作者：
Wang Guocheng;Huang Yao;Zhang Wen;Yu Yongqiang;Sun Wenjuan
背景与目的增加农田土壤有机碳库不仅可以促进作物生产，而且可以减缓气候变化。本研究的目的是定量研究维持中国农田有机碳水平和将其提高到全球平均水平所需的碳输入率。我们进行了高空间分辨率的模拟，（10 × 10公里）结果模型模拟结果表明，在给定的情景下，中国农田的平均碳输入量为2.1 Mg C，ha−1year− 1是需要停止土壤碳流失和SOC密度可以接近全球平均值55 Mg C ha− 1时，到2050年5.1 Mg C ha−1year− 1被纳入soil.ConclusionsThe量化的C输入显示出很大的空间差异，取决于现有的SOC水平，平均年温度和降水量。耕地面积占全国9.2%的黑龙江省现有土壤有机碳水平较高，但目前碳输入量较低。增加有机碳的投入应是该省的优先发展方向。
Background and aimsIncreasing the soil organic carbon (SOC) pool in croplands can not only promote crop production but also mitigate climate change. The objective of this work was to quantify the needed C input rates for both maintaining China’s cropland SOC and improving it to global average level.MethodsBy using a biogeophysical model (Agro-C), we performed simulations with a high spatial resolution (10 × 10 km) across China’s croplands to quantify the C input rate under given scenarios.ResultsThe model simulations showed that an average C input of 2.1 Mg C ha−1year−1is required to stop soil C loss and that SOC density could approach the global mean of 55 Mg C ha−1by 2050 when 5.1 Mg C ha−1year−1is incorporated into the soils.ConclusionsThe quantified C inputs showed a large spatial disparity, depending on the existing SOC level, mean annual temperature and precipitation. The existing SOC level in Heilongjiang Province, where the cropland area accounts for 9.2 % of the national total, is much higher but the current C input is much lower than it is elsewhere. Increasing the organic C input should be given priority in this province.