Spatial-Temporal Changes of Soil Organic Carbon During Vegetation Recovery at Ziwuling, ChinaEnglish Full Text

LI Yu-Yuan 1,2, SHAO Ming-An 1,2,*2, ZHENG Ji-Yong 2 and ZHANG Xing-Chang2 1 Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and NaturalResources Research, Chinese Academy of Sciences, Beijing 100101 (China). 2 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conser-vation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100 (China)

Abstract: To probe the processes and mechanisms of soil organic carbon （SOC） changes during forest recovery, a 150-yearchronosequence study on SOC was conducted for various vegetation succession stages at the Ziwuling area, in the centralpart of the Loess Plateau, China. Results showed that during the 150 years of local vegetation rehabilitation SOC increasedsignificantly （P ＜ 0.05） over time in the initial period of 55-59 years, but slightly decreased afterwards. Average SOCdensities for the 0-100 cm layer of farmland, grassland, shrubland and forest were 4.46, 5.05, 9.95, and 7.49 kg C m-3,respectively. The decrease in SOC from 60 to 150 years of abandonment implied that the soil carbon pool was a sink forCO2 before the shrubland stage and became a source in the later period. This change resulted from the spatially variedcomposition and structure of the vegetation. Vegetation recovery had a maximum effect on the surface （0-20 cm） SOCpool. It. was concluded that vegetation recovery on the Loess Plateau could result in significantly increased sequestrationof atmospheric CO2 in soil and vegetation, which was ecologically important for mitigating the increase of atmosphericconcentration of CO2 and for ameliorating the local eco-environment.

Keywords：

soil organic carbon density; spatial-temporal change; vegetation recovery; vegetation succession;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S158;

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