CAJ | 학술논문

采用静态箱-气相色谱仪法,对洪河湿地CO2呼吸通量进行观测,模拟不同水平氮输入湿地,设计0、20、40、60 g·m-2四种氮水平及秸秆还田处理,探讨不同氮水平对洪河湿地CO2释放的影响.结果表明,7月生态系统呼吸通量高于其他月份,呈现出季节变化的单峰模式.湿地CO2通量与温度具有相关性,其中与5 cm深土壤温度相关性最强,呈指数相关关系.不同氮水平系统呼吸通量与5 cm地温二次相关.氮输入促进了湿地CO2排放,且中氮量输入(N2PK)释放量最多,秸秆还田技术能抑制中氮输入量产生的高呼吸通量.
채용정태상-기상색보의법,대홍하습지CO2호흡통량진행관측,모의불동수평담수입습지,설계0、20、40、60 g·m-2사충담수평급갈간환전처리,탐토불동담수평대홍하습지CO2석방적영향.결과표명,7월생태계통호흡통량고우기타월빈,정현출계절변화적단봉모식.습지CO2통량여온도구유상관성,기중여5 cm심토양온도상관성최강,정지수상관관계.불동담수평계통호흡통량여5 cm지온이차상관.담수입촉진료습지CO2배방,차중담량수입(N2PK)석방량최다,갈간환전기술능억제중담수입양산생적고호흡통량.
CO2 flux was measured monthly over the growing seasons with the closed-chamber technique in the Honghe Wetland. Four N-treatments(0, 20, 40, 60 g·m-2) and straw-return were designed, the effect of different nitrogen application CO2 emission from Honghe wetland was further discussed. The results shows that the CO2 flux was higher in July than other months in the growth season. The CO2 flux was more positively correlated with soil temperature of 5 cm depth than air temperature and soil temperature of 0cm depth, 10cm depth, 15 cm depth, 20 cm depth, there was exponential relationship between CO2 flux and the soil temperature (5 cm). In different nitrogen levels, CO2 fluxes quadratic ally correlated to the temperature at 5 cm depth. The application of fertilizer can improve CO2 flux;ecosystem respiration increased with the increase of nitrogen amount, the maximum soil respiration rate was at N2PK level, and straw-return would decrease the CO2 fluxes of N2PK level.