Erosion and Vegetation Restoration Impacts on Ecosystem Carbon Dynamics in South China
发表在:Soil Science Society 74 272-281    于:2010

EDCM, Erosion-Deposition Carbon Model; NPP, net primary production; SOC, soil organic carbon.


To quantify the consequences of erosion and vegetation restoration on ecosystem C dynamics (a key element in understanding the terrestrial C cycle), fi eld measurements were collected since 1959 at two experimental sites set up on highly disturbed barren land in South China. One site had received vegetation restoration (the restored site) while the other received no planting and remained barren (the barren site). Th e Erosion-Deposition Carbon Model (EDCM) was used to simulate the ecosystem C dynamics at both sites. Th e on-site observations in 2007 showed that soil organic C (SOC) storage in the top 80-cm soil layer at the barren site was 50.3 ± 3.5 Mg C ha−1, half that of the restored site. Th e SOC and surface soil loss by erosion at the restored site from 1959 to 2007 was 3.7 Mg C ha−1 and 2.2 cm, respectively—one-third and one-eighth that of the barren site. Th e on-site C sequestration in SOC and vegetation at the restored site was 0.67 and 2.5 Mg C ha−1 yr−1, respectively, from 1959 to 2007, driven largely by tree growth and high atmospheric N deposition in the study area. Simulated fi ndings suggested that higher N deposition resulted in higher on-site SOC storage in the soil profi le (with SOC in the top 20-cm layer increasing more signifi cantly), and higher on-site ecosystem C sequestration as long as N saturation was not reached. Lacking human-induced vegetation recovery, the barren site remained as barren land from 1959 to 2007 and the on-site C decrease was 0.28 Mg C ha−1 yr−1. Our study clearly indicated that vegetation restoration and burial by soil erosion provide a large potential C sink in terrestrial ecosystems.

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