Growing Season Carbon Dioxide Exchange in Flooded Non-Mulching and Non-Flooded Mulching CottonReport as inadecuate




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There is much interest in the role that agricultural practices might play in sequestering carbon to help offset rising atmospheric CO2 concentrations. However, limited information exists regarding the potential for increased carbon sequestration of different management strategies. The objective of this study was to quantify and contrast carbon dioxide exchange in traditional non-mulching with flooding irrigation TF and plastic film mulching with drip irrigation PM cotton Gossypium hirsutum L. fields in northwest China. Net primary productivity NPP, soil heterotrophic respiration Rh and net ecosystem productivity NEP were measured during the growing seasons in 2009 and 2010. As compared with TF, PM significantly increased the aboveground and belowground biomass and the NPP 340 g C m−2 season−1 of cotton, and decreased the Rh 89 g C m−2 season−1 p<0.05. In a growing season, PM had a higher carbon sequestration in terms of NEP of ∼ 429 g C m−2 season−1 than the TF. These results demonstrate that conversion of this type of land use to mulching practices is an effective way to increase carbon sequestration in the short term in cotton systems of arid areas.



Author: Zhi-guo Li, Run-hua Zhang, Xiu-jun Wang, Fang Chen, Chang-yan Tian

Source: http://plos.srce.hr/



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