Spatial distribution characteristics and reserve estimation of soil organic carbon in the hydro-fluctuation belt of the Pubugou reservoir
XIN Zhiyuan1,2, XIA Jianguo3
1. College of Resources and Environmental Engineering, Mianyang Normal University, 621000, Mianyang, Sichuan, China; 2. Ecological Security and Protection Key Laboratory of Sichuan Province, 621000, Mianyang, Sichuan, China; 3. College of Resources, Sichuan Agricultural University, 611130, Chengdu, China
Abstract：[Background] Previous studies demonstrate that the global CO2 emissions and climate warming is affected by reserves and distribution of soil organic carbon. Subsequently, the release of soil organic carbon is serious due to the frequent alternations of dry and wet in the hydro-fluctuation belt. The water level difference in the hydro-fluctuation belt of the Pubugou reservoir reaches 60 m, and the nutrient loss is serious because of the complex terrain combined with special dry and hot climate. However, no relevant research has been reported yet. [Methods] The 0-40 cm soil of the hydro-fluctuation belt in the Pubugou reservoir in southwestern China was selected to gain insight into the spatial distribution of soil organic carbon and its storage estimation. The survey and investigation of the site was conducted by the total station instrument, and the soil samples were collected separately based on the land use and land cover (LULC), altitude and terrain. The reserves of soil organic carbon of the hydro-fluctuation belt were estimated by using the collected samples, analyzing distribution characteristics of soil organic carbon, and excluding the interaction effect of three factors with the ArcGIS software and testing the data of soil sample. [Results] 1) In the hydro-fluctuation belt, the content of soil organic carbon decreased with the soil depth increasing, which changed with a value of 14.75, 12.19 and 9.70 g/kg in the soil layer of 0-10 cm, 10-20 cm and 20-40 cm, respectively. 2) The average value of soil organic carbon under different LULC was detected as follows: sludge>grassland>dryland>bare land. 3) The content of soil organic carbon was also inversely proportional to the LS value of terrain factor. 4) The total soil organic carbon reserves at 0-40 cm depth were 184 134.14 t, and the mean density was 6.29 kg/m2. After deducting the 2.21 hm2 area of dam and bare rock, the mean density was 6.80 kg/m2. In the soil layer of 0-40 cm, the high storage density of soil organic carbon was found in grassland and sludge. Additionally, the area of low storage density showed a substantial amount of bare land. [Conclusions] This research reveals the spatial distribution characteristics of soil organic carbon, meanwhile the estimation of soil organic carbon reserves in the hydro-fluctuation belt of the Pubugou reservoir are also illustrated. It proves a new method for multi-factor calculation of soil nutrient reserves and also provides basic scientific data for ecological protection in the research area.
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XIN Zhiyuan, XIA Jianguo. Spatial distribution characteristics and reserve estimation of soil organic carbon in the hydro-fluctuation belt of the Pubugou reservoir. SSWC, 2020, 18(6): 90-98.
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2020, Vol. 18 
