中国地理科学 ›› 2018, Vol. 28 ›› Issue (3): 400-410.doi: 10.1007/s11769-018-0956-4

• 论文 • 上一篇    下一篇

Effects of Anthropogenic Disturbance on Sediment Organic Carbon Mineralization Under Different Water Conditions in Coastal Wetland of a Subtropical Estuary

MOU Xiaojie1, LIU Xingtu1, SUN Zhigao2, TONG Chuan2, HUANG Jiafang2, WAN Siang1, WANG Chun1, WEN Bolong1   

  1. 1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
    2. Institute of Geography, Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350007, China
  • 收稿日期:2017-05-12 修回日期:2017-08-10 出版日期:2018-06-27 发布日期:2018-04-27
  • 通讯作者: LIU Xingtu.E-mail:lxtmxh@163.com E-mail:lxtmxh@163.com
  • 基金资助:

    Under the auspices of National Basic Research Program of China (No. 2012CB956100), National Natural Science Foundation of China (No. 41301085), the Key Foundation of Science and Technology Department of Fujian Province (No. 2016R1032-1)

Effects of Anthropogenic Disturbance on Sediment Organic Carbon Mineralization Under Different Water Conditions in Coastal Wetland of a Subtropical Estuary

MOU Xiaojie1, LIU Xingtu1, SUN Zhigao2, TONG Chuan2, HUANG Jiafang2, WAN Siang1, WANG Chun1, WEN Bolong1   

  1. 1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
    2. Institute of Geography, Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350007, China
  • Received:2017-05-12 Revised:2017-08-10 Online:2018-06-27 Published:2018-04-27
  • Contact: LIU Xingtu.E-mail:lxtmxh@163.com E-mail:lxtmxh@163.com
  • Supported by:

    Under the auspices of National Basic Research Program of China (No. 2012CB956100), National Natural Science Foundation of China (No. 41301085), the Key Foundation of Science and Technology Department of Fujian Province (No. 2016R1032-1)

摘要:

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 < 0.001), and the interaction between human disturbance activities and water conditions was also significant (P < 0.01). The C mineralization rate and the cumulative mineralized carbon dioxide-carbon (CO2-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 CO2-C showed a good fit (R2 > 0.91) to the first-order kinetic model Ct=C0 (1-exp(-kt)). The kinetic parameters C0, k and C0k were significantly affected by human disturbance and water conditions. In addition, the total amount of mineralized C (in 49 d) was positively related to C0, C0k 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

Abstract:

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 < 0.001), and the interaction between human disturbance activities and water conditions was also significant (P < 0.01). The C mineralization rate and the cumulative mineralized carbon dioxide-carbon (CO2-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 CO2-C showed a good fit (R2 > 0.91) to the first-order kinetic model Ct=C0 (1-exp(-kt)). The kinetic parameters C0, k and C0k were significantly affected by human disturbance and water conditions. In addition, the total amount of mineralized C (in 49 d) was positively related to C0, C0k 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.

Key words: human disturbance, carbon mineralization, water conditions, coastal wetland