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Effects of Anthropogenic disturbance on Sediment Organic carbon mineralization Under Different water conditions in coastal wetland of a Subtropical Estuary

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Chinese Geographical Science 2018年第3期28卷 400-410页

作者： MOU Xiaojie LIU Xingtu SUN Zhigao TONG Chuan HUANG Jiafang WAN Siang WANG Chun WEN Bolong Key Laboratory of wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Institute of Geography Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education Fujian Normal University

The changes in soil organic carbon(C) mineralization as affected by anthropogenic disturbance directly determine the role of soils as C source or sink in the global C budget. The objectives of this study were to investigate the effects of anthropogenic disturbance(aquaculture pond, pollutant discharge and agricultural activity) on soil organic C mineralization under different water conditions in the Minjiang River estuary wetland, Southeast China. The results showed that the organic C mineralization in the wetland soils was significantly affected by human disturbance and water conditions(P human disturbance activities and water conditions was also significant(P mineralization rate and the cumulative mineralized carbon dioxide-carbon(CO_2-C)(at the 49th day) ranked from highest to lowest as follows: Phragmites australis wetland soil > aquaculture pond sediment > soil near the discharge outlet > rice paddy soil. This indicated that human disturbance inhibited the mineralization of C in soils of the Minjiang River estuary wetland, and the inhibition increased with the intensity of human disturbance. The data for cumulative mineralized CO_2-C showed a good fit(R^2 > 0.91) to the first-order kinetic model C_t = C_0(1 – exp(–kt)). The kinetic parameters C_0, k and C_0 k were significantly affected by human disturbance and water conditions. In addition, the total amount of mineralized C(in 49 d) was positively related to C_0, C_0 k and electrical conductivity of soils. These findings indicated that anthropogenic disturbance suppressed the organic C mineralization potential in subtropical coastal wetland soils, and changes of water pattern as affected by human activities in the future would have a strong influence on C cycling in the subtropical estuarine wetlands.

关键词： human disturbance carbon mineralization water conditions coastal wetland

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