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Wetlands

, Volume 39, Issue 4, pp 789–801 | Cite as

Spatial Distribution of Soil Organic Matter Related to Microtopography and NDVI Changes in Poyang Lake, China

  • Lilin Zheng
  • Jinying Xu
  • Zhiqiang Tan
  • Ligang Xu
  • Xiaolong WangEmail author
General Wetland Science

Abstract

The interactions between soil organic matter (SOM) and micro-topography and vegetation drive the ecology of wetland ecosystems. We investigated the distribution pattern of SOM and its relationships with elevation, slope, aspect, topographic wetness index (TWI), and normalized difference vegetation index (NDVI) in Poyang Lake, the largest freshwater lake of China. The local parameters were obtained by applying a geographically weighted regression model. Local parameter differences were analyzed between two dominant wetland types (dish-shaped pit wetland and delta wetland) and among nine land-cover types (deep water, shallow water, very shallow water, mudflat, meadow, sparse grassland, Carex-Phalaris community, Phragmites-Triarrhena community, and Artemisia-Cynodon community). The SOM response to elevation was most sensitive in the dish-shaped pit wetland and mudflat, whereas the effects of slope on SOM were more significant in the delta wetland and vegetated land-cover types. Relatively weaker correlations were observed between SOM and aspect in all study zones. Positive correlations were found between SOM and TWI, which was strongest in dish-shaped pit wetland and deep water. NDVI was positively related to SOM in most areas, but the relationships were not significant in the southern area and in the mudflat. This study helps to better understand the spatial heterogeneity of Poyang Lake.

Keywords

SOM Spatial distribution pattern Micro-topography Land-cover type Poyang Lake 

Notes

Acknowledgements

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA19050502), STS (Science and Technology Service Network Initiative) Project of Chinese Academy of Sciences (KFJ-STS-ZDTP-011), National Natural Science Foundation of China (41801080) and the Natural Science Foundation of Jiangxi province (20181BAB213011).

Supplementary material

13157_2019_1131_MOESM1_ESM.docx (13 kb)
ESM 1 (DOCX 13 kb)
13157_2019_1131_Fig7_ESM.png (1.1 mb)
ESM 2

Fig. 7 Land-cover map (on the left side) and dish-shaped pit wetlands distribution map (on the right side) (PNG 1099 kb)

13157_2019_1131_MOESM2_ESM.tif (23.8 mb)
High resolution image (TIF 24391 kb)

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Copyright information

© Society of Wetland Scientists 2019

Authors and Affiliations

  • Lilin Zheng
    • 1
    • 2
  • Jinying Xu
    • 1
    • 2
  • Zhiqiang Tan
    • 2
  • Ligang Xu
    • 2
  • Xiaolong Wang
    • 2
    Email author
  1. 1.University of Chinese Academy of ScienceBeijingPeople’s Republic of China
  2. 2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjingPeople’s Republic of China

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