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Measuring and Mapping Patterns of Soil Erosion and Deposition Related to Soil Carbonate Concentrations Under Agricultural Management
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Effective soil erosion control represents a significant net carbon sequestration.

Lishan Ran1, Xixi Lu2,3, Nufang Fang4

  • 1Department of Geography, The University of Hong Kong, Pokfulam Road, Pokfulam, Hong Kong. lsran@hku.hk.

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|August 15, 2018
PubMed
Summary

Soil conservation in China

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Area of Science:

  • Environmental Science
  • Soil Science
  • Climate Change Research

Background:

  • Soil erosion is a major global issue with debated impacts on atmospheric carbon dioxide (CO2).
  • The Yellow River basin in China experiences severe soil erosion.
  • China has implemented large-scale soil conservation and revegetation programs since the 1970s, notably the Grain-for-Green Project.

Purpose of the Study:

  • To quantify the carbon (C) stabilization achieved through soil erosion control in the Yellow River basin.
  • To assess the impact of soil conservation on the fate of erosion-induced organic carbon (OC).

Main Methods:

  • Compilation of hydrological records and organic carbon (OC) data.
  • Estimation of primary production.
  • Comparison of OC fate between a baseline period (1950-1970) and a conservation period (2000-2015).

Main Results:

  • Soil conservation efforts controlled approximately 20.6 Tg of OC annually.
  • Decomposition of erosion-induced soil organic carbon (SOC) decreased from 8 Tg C yr-1 to 5.3 Tg C yr-1.
  • Reduced C emissions from the Yellow River basin alone represent 12.7% of China's total forest-related C accumulation.

Conclusions:

  • Soil conservation significantly alters the fate of erosion-induced OC, leading to substantial C stabilization.
  • Reduced C emissions and increased C storage from soil conservation provide significant atmospheric C-capturing benefits.
  • The C storage benefits of soil conservation warrant inclusion in future carbon inventories.