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中国南方双季稻田转菜地对CO2和CH4通量的影响

袁野1,2,刘长红3,戴晓琴1,4**,王辉民1,4   

  1. (1中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室千烟洲生态站, 北京 100101; 2中国科学院大学, 北京 100049; 3湖南农业大学资源环境学院, 长沙 410128; 4江西省区域生态过程与信息重点实验室, 江西泰和 343725)
  • 出版日期:2015-01-18 发布日期:2015-01-18

Effects of land-use conversion from double rice cropping to vegetables on CO2 and CH4 fluxes in southern China.

YUAN Ye1,2, LIU Chang-hong3, DAI Xiao-qin1,4, WANG Hui-min1,4   

  1. (1Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 4Jiangxi Province Key Laboratory of Regional Ecological Processes and Information, Taihe 343725, Jiangxi, China)
  • Online:2015-01-18 Published:2015-01-18

摘要:

采用静态箱-气相色谱法观测了我国南方亚热带水稻田转为旱作蔬菜地后第1年的CO2和CH4通量变化,旨在探索稻田转菜地初期对CO2和CH4通量的影响.结果表明: CO2通量因蔬菜种类、生长状况及生长季节的不同而不同.种植豇豆菜地CO2通量显著高于稻田,种植辣椒菜地CO2通量则显著低于稻田.稻田转菜地CH4通量从6.96 mg C·m-2·h-1显著下降到-0.004 mg C·m-2·h-1(P<0.001).转菜地后CO2和CH4的净累积碳吸收为543 kg C·hm-2,显著低于稻田的3641 kg C·hm-2,但由净CO2和CH4排放造成的增温效应无显著差异.转成菜地1年后的土壤有机碳含量有所升高,且10~20 cm土层显著高于对照水稻田.

 

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.