Journal Article

FZJ-2017-07953

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Land use change effects on ecosystem carbon budget in the Sichuan Basin of Southwest China: Conversion of cropland to forest ecosystem

Wang, X. ; Zhou, M. (Corresponding author)FZJ* ; Li, T. ; Ke, Y. ; Zhu, B.

2017
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.scitotenv.2017.07.167

Abstract: In the humid subtropics, conversion of cropland to forest has been recognized to influence carbon cycling (e.g., soil CO2 emissions) and the associated ecosystem carbon balance. A three-year field study was conducted in situ to quantitatively evaluate effects of land use change on carbon budget in a cropland (under winter wheat-summer maize rotation) comparison with the adjacent forest ecosystem. During the three-year experimental period, on average, soil heterotrophic respirations were 35.19 mg C·m− 2·h− 1 for the cropland and 40.02 mg C·m− 2·h− 1 for the adjacent forest ecosystem. The quantified net primary production (NPP) were 8724.78 kg C·ha− 1·year− 1 for the cropland (3218.14 kg C·ha− 1 for winter wheat season and 5506.64 kg C·ha− 1 for summer maize season) and 6478.99 kg C·ha− 1·year− 1 for the adjacent forest ecosystem. Thus, the average positive net ecosystem production (NEP) of 5139.33 kg C·ha− 1·year− 1 and 2790.43 kg C·ha− 1·year− 1 were gained in the cropland and the adjacent forest ecosystem, respectively. Nonetheless, if take into consideration of crop grain harvest (i.e., removal), the mean NEP was only 976.69 kg C·ha− 1·year− 1 for cropland which were over three-fold lower than for the adjacent forest ecosystem. The practice of conversion of cropland (maize-wheat rotation system) to forest consequently resulted in an average annual net carbon sequestration of 1813.74 kg C·ha− 1·year− 1 in the study. Therefore, our findings highlight that practices of conversion of subtropical cropland to forest commonly conducted in the last decades act as sinks of atmospheric CO2 in southwest China.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)

Appears in the scientific report 2017

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Database coverage:
; BIOSIS Previews ; Current Contents - Agriculture, Biology and Environmental Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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