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Loess Plateau check dams can potentially sequester eroded soil organic carbon
Author(s) -
Zhang Haicheng,
Liu Shuguang,
Yuan Wenping,
Dong Wenjie,
Xia Jiangzhou,
Cao Yaojun,
Jia Yanwei
Publication year - 2016
Publication title -
journal of geophysical research: biogeosciences
Language(s) - English
Resource type - Journals
eISSN - 2169-8961
pISSN - 2169-8953
DOI - 10.1002/2016jg003348
Subject(s) - environmental science , soil carbon , mineralization (soil science) , ecosystem , loess plateau , soil science , total organic carbon , loess , soil water , hydrology (agriculture) , ecology , environmental chemistry , geology , geotechnical engineering , geomorphology , chemistry , biology
Check dams are special soil and water conservation structures in the Loess Plateau, China. They play an important role in intercepting sediments and soil organic carbon (SOC). However, the decomposition of intercepted SOC and the environmental regulations at check dams have not been investigated. We conducted several paired field experiments at both check dams and slope lands in the Yanhe Watershed of the Loess Plateau to examine the characteristics of SOC decomposition at check dams. On average, the SOC mineralization rate in slope lands was approximately three times higher than in check dams. Increased soil moisture and compaction in check dams can constrain carbon mineralization by limiting the oxygen availability of SOC and can isolate substrate carbon from heterotrophic microorganisms. Our results indicate that check dams display a considerable potential for eroded SOC sequestration via reducing the soil respiration rate and highlight the important implications of lateral carbon redistribution and human engineering projects when estimating regional or global ecosystem carbon cycles.