Spatiotemporal variability of soil organic carbon for different topographic and land use types in a gully watershed on the Chinese Loess Plateau
Fan Yang A B C , Xiaorong Wei A B , Mingbin Huang
A B D , Chenhui Li B , Xiaofang Zhao B and Zhongdian Zhang B
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China.
B Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China.
C University of Chinese Academy of Sciences, Beijing 100049, China.
D Corresponding author. Email: hmbd@nwsuaf.edu.cn
Soil Research 59(4) 383-395 https://doi.org/10.1071/SR19317
Submitted: 4 November 2019 Accepted: 6 December 2020 Published: 29 January 2021
Abstract
The ‘Grain-for-Green’ program implemented on the Loess Plateau in China has dramatically changed land use types, and subsequently enhanced the spatiotemporal variability of soil organic carbon (SOC) in the watersheds. However, the spatiotemporal variability of SOC for different topographic and land use types within small watersheds has not been adequately explored following the implementation of the ‘Grain-for-Green’ program. In this study, we determined the spatiotemporal variability of SOC content using the data collected in 1993, 2002, 2005, and 2012 and measured in 2018 and identified its driving factors for different topographic (tableland, sloping land, and gully) and land use types in the Wangdonggou watershed on the Loess Plateau. The spatial patterns of SOC content differed among tableland, sloping land, and gully, with higher spatial variability in gully than sloping land and tableland. The SOC content in the 0–20 cm soil layer in 2018 increased by 8.58%, 26.4%, and 22.2%, compared to 2002, for tableland, sloping land, and gully, respectively. Woodland and grassland had a great potential to sequester and stabilise carbon. The vegetation cover was a relatively dominant factor affecting SOC content throughout the watershed. Our results indicate a close relationship between SOC content and topographic, vegetation, and edaphic variables. This information is critical for understanding SOC dynamics at the watershed scale for sustainable ecological restoration.
Keywords: ecological restoration, land use type, spatial distribution of SOC, temporal change of SOC, topographic type.
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