中国地理科学 ›› 2021, Vol. 31 ›› Issue (2): 197-208.doi: 10.1007/s11769-021-1185-9

• 论文 •    

Effect of Hydrological Connectivity on Soil Carbon Storage in the Yellow River Delta Wetlands of China

FENG Jiuge1, LIANG Jinfeng1,2, LI Qianwei1, ZHANG Xiaoya1, YUE Yi1, GAO Junqin1,3   

  1. 1. School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China;
    2. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;
    3. The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration
  • 收稿日期:2020-03-09 发布日期:2021-01-05
  • 通讯作者: GAO Junqin E-mail:gaojq@bjfu.edu.cn
  • 基金资助:
    Under the auspices of the National Key Research and Development Program of China (No. 2017YFC0505903), College Student Research and Career-creation Program of China (No. 201810022070)

Effect of Hydrological Connectivity on Soil Carbon Storage in the Yellow River Delta Wetlands of China

FENG Jiuge1, LIANG Jinfeng1,2, LI Qianwei1, ZHANG Xiaoya1, YUE Yi1, GAO Junqin1,3   

  1. 1. School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China;
    2. State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China;
    3. The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration
  • Received:2020-03-09 Published:2021-01-05
  • Contact: GAO Junqin E-mail:gaojq@bjfu.edu.cn
  • Supported by:
    Under the auspices of the National Key Research and Development Program of China (No. 2017YFC0505903), College Student Research and Career-creation Program of China (No. 201810022070)

摘要: Hydrological connectivity has significant effects on the functions of estuarine wetland ecosystem. This study aimed to examine the dynamics of hydrological connectivity and its impact on soil carbon pool in the Yellow River Delta, China. We calculated the hydrological connectivity based on the hydraulic resistance and graph theory, and measured soil total carbon and organic carbon under four different hydrological connectivity gradients (Ⅰ 0?0.03, Ⅱ 0.03?0.06, Ⅲ 0.06?0.12, Ⅳ 0.12?0.39). The results showed that hydrological connectivity increased in the north shore of the Yellow River and the south tidal flat from 2007 to 2018, which concentrated in the mainstream of the Yellow River and the tidal creek. High hydrological connectivity was maintained in the wetland restoration area. The soil total carbon storage and organic carbon storage significantly increased with increasing hydrological connectivity from Ⅰ to Ⅲ gradient and decreased in Ⅳ gradient. The highest soil total carbon storage of 0?30 cm depth was 5172.34 g/m2, and organic carbon storage 2764.31 g/m2 in Ⅲ gradient. The hydrological connectivity changed with temporal and spatial change during 2007?2018 and had a noticeable impact on soil carbon storage in the Yellow River Delta. The results indicated that appropriate hydrological connectivity, i.e. 0.08, could effectively promote soil carbon storage.

关键词: coastal wetland, hydrological connectivity, soil carbon, carbon storage, spatiotemporal variation, the Yellow River Delta

Abstract: Hydrological connectivity has significant effects on the functions of estuarine wetland ecosystem. This study aimed to examine the dynamics of hydrological connectivity and its impact on soil carbon pool in the Yellow River Delta, China. We calculated the hydrological connectivity based on the hydraulic resistance and graph theory, and measured soil total carbon and organic carbon under four different hydrological connectivity gradients (Ⅰ 0?0.03, Ⅱ 0.03?0.06, Ⅲ 0.06?0.12, Ⅳ 0.12?0.39). The results showed that hydrological connectivity increased in the north shore of the Yellow River and the south tidal flat from 2007 to 2018, which concentrated in the mainstream of the Yellow River and the tidal creek. High hydrological connectivity was maintained in the wetland restoration area. The soil total carbon storage and organic carbon storage significantly increased with increasing hydrological connectivity from Ⅰ to Ⅲ gradient and decreased in Ⅳ gradient. The highest soil total carbon storage of 0?30 cm depth was 5172.34 g/m2, and organic carbon storage 2764.31 g/m2 in Ⅲ gradient. The hydrological connectivity changed with temporal and spatial change during 2007?2018 and had a noticeable impact on soil carbon storage in the Yellow River Delta. The results indicated that appropriate hydrological connectivity, i.e. 0.08, could effectively promote soil carbon storage.

Key words: coastal wetland, hydrological connectivity, soil carbon, carbon storage, spatiotemporal variation, the Yellow River Delta