Home > Publications database > Land use change effects on ecosystem carbon budget in the Sichuan Basin of Southwest China: Conversion of cropland to forest ecosystem > print

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024 7 _ |a 10.1016/j.scitotenv.2017.07.167
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100 1 _ |a Wang, Xiaoguo
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245 _ _ |a Land use change effects on ecosystem carbon budget in the Sichuan Basin of Southwest China: Conversion of cropland to forest ecosystem
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a 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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700 1 _ |a Zhou, Minghua
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700 1 _ |a Li, Tao
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700 1 _ |a Ke, Yun
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700 1 _ |a Zhu, Bo
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773 _ _ |a 10.1016/j.scitotenv.2017.07.167
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