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Exploring land reclamation history: Soil organic carbon sequestration due to dramatic oasis agriculture expansion in arid region of Northwest China

文献类型： 外文期刊

作者： Xu, Erqi 1 ; Zhang, Hongqi 1 ; Xu, Yongmei 2 ;

作者机构： 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Soil & Fertilizer, Urumqi 830091, Peoples R China

关键词： Soil organic carbon; Oasis agriculture expansion; Land use change; Carbon sequestration; Tarim Basin

期刊名称：ECOLOGICAL INDICATORS （ 影响因子：4.958； 五年影响因子：5.846 ）

ISSN： 1470-160X

年卷期： 2020 年 108 卷

页码：

收录情况： SCI

摘要： A better understanding of land reclamation history and its influence on soil organic carbon (SOC) is critical to SOC sequestration. The arid region, significantly influencing the global trend and inter-annual variability of the carbon sink, experienced the large-scale oasis agriculture expansion had significantly depleted native vegetation, and how this altered the soil carbon balance is still unclear. Taking the typical Tarim Basin as study area, this study proposed a spatial method of identifying agricultural reclamation histories and applied it to the specific field soil sampling design for exploring SOC changes under different histories, including the prior land use types changing to cropland and cultivation ages after the reclamation. Results showed that oasis agriculture area nearly doubled over nearly 40 years, majorly from grasslands and part from forests. Comparison of the SOC densities collected in 2015 to data in the late 1970s found an accumulation effect of SOC in agricultural practices, where croplands reclaimed before the late 1970s have a higher SOC density (1.86 kg C m(-2)) than those reclaimed after the late 1970s. The change trend and magnitude in SOC density upon the prior land uses were significantly different, with a mean value of 0.37, 0.03, and - 0.99 kg C m(-2) for the previous cropland, grassland, and forest, respectively. An increase in the cultivation ages would raise the magnitude of SOC sequestration, where the SOC loss reclaimed from the grassland was recovered after nearly 30 years of farming activities, but that from the forest cannot be recovered even within as much as 40 years of cultivation. These findings provide a new insight to the significantly different effect of agricultural reclamation histories on the SOC dynamics and indicated the considerable potential of the carbon sink, if sustainably managed, in the arid region of Northwest China.

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