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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543kg 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.
The change of CO2 and CH4 fluxes in the first year after converting subtropical paddy fields to dry vegetable lands in southern China was studied by static box-gas chromatography (GC-MS). The aim was to explore the effects of CO2 and CH4 fluxes The results showed that the flux of CO2 varied with the type of vegetables, the growth status and the growing season.The CO2 flux of planting cowpea was significantly higher than that of paddy field, and the CO2 flux of planting pepper was significantly lower than that of paddy field (P <0.001), the net cumulative carbon uptake of CO2 and CH4 was 543 kg C · (-1) after 6.96 mg C · m-2 · h-1 and decreased to -0.004 mg C · m-2 · h- hm-2, which was significantly lower than 3641 kg C · hm-2 in paddy field, but there was no significant difference in warming effect caused by net CO2 and CH4 emissions.After one year of conversion to vegetable field, the content of soil organic carbon increased, And the soil layer in 10 ~ 20 cm was significantly higher than that in the control paddy field.