湿地
矿化(土壤科学)
环境科学
沼泽
互花米草
温室气体
土壤碳
固碳
水文学(农业)
土壤水分
土壤科学
地质学
二氧化碳
环境化学
生态学
化学
生物
岩土工程
作者
Ping Yang,Linhai Zhang,Derrick Y.F. Lai,Hong Yang,Lishan Tan,Liangjuan Luo,Chuan Tong,Yan Hong,Wanyi Zhu,Kam W. Tang
摘要
Abstract Plant invasion and aquaculture activities have drastically modified the landscape of coastal wetlands in many countries, but their impacts on soil organic carbon (SOC) mineralization and greenhouse gas production remain poorly understood. We measured SOC mineralization rate and soil CO 2 and CH 4 production rates in three habitat types from 21 coastal sites across the tropical and subtropical zones in China: native mudflats (MFs), Spartina alterniflora marshes (SAs), and aquaculture ponds (APs). Landscape change from MFs to SAs or APs increased total and labile fraction of SOC, as well as carbon mineralization rate and greenhouse gas production, but there were no discernible differences in SOC source‐sink dynamics between SAs and APs. SOC mineralization rate was highest in SAs (20.4 μg g −1 d −1 ), followed by APs (16.9 μg g −1 d −1 ) and MFs (11.9 μg g −1 d −1 ), with CO 2 as the dominant by‐product. Bioavailable SOC was less than 2% and was turned over within 60 days in all three habitat types. Proliferation of S . alterniflora marshes and expansion of AP construction had resulted in a net increase in soil CO 2 ‐eq production of 0.4–4.3 Tg yr −1 in the last three decades. Future studies will benefit from better census and monitoring of coastal habitats in China, complementary in situ measurements of greenhouse gas emissions, and more sampling in the southern provinces to improve spatial resolution.
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