title: [Effects of land-use conversion from double rice cropping to vegetables on CO2 and CH4 fluxes in southern China].
abstract: In this study, the CO2 and CH4 fluxes in the first year after land use conversion from paddy rice to vegetables were measured by static opaque chamber and gas-chromatograph (GC) method to investigate the land conversion effects on soil CO2 and CH4 emissions. Our results showed that the differences in CO2 fluxes depended on the vegetable types, growing status and seasons. The CO2 flux from the vegetable field was greater than that from the paddy rice field when cowpea was planted, but was lower when pepper was planted. The CH4 flux significantly decreased from 6.96 mg C . m-2 . h-1 to -0.004 mg C . m-2 . h-1 with the land use conversion from rice to vegetables.The net carbon absorption ( CO2 + CH4) of the vegetable fields was 543 kg C . hm-2, significantly lower than that (3641 kg C . hm-2) of the rice paddies. However, no significant difference was found in their global warming impact. In addition, soil carbon content increased in vegetable fields compared to the paddy rice fields after a year of conversion, especially in the 10-20 cm soil layer.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yuan
authors.forename: Chang-hong
authors.initials: CH
authors.lastname: Liu
authors.forename: Xiao-qin
authors.initials: XQ
authors.lastname: Dai
authors.forename: Hui-min
authors.initials: HM
authors.lastname: Wang
mesh_terms: D000383:Agriculture / Q000379:methods*; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D057232:Global Warming; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide; D012275:Oryza; D012621:Seasons; D012987:Soil / Q000737:chemistry; D014675:Vegetables
chemical_list: D012987:Soil; D002245:Carbon Dioxide; D009609:Nitrous Oxide; D008697:Methane