Characteristics of carbon, water, and energy fluxes on abandoned farmland revealed by critical zone observation in the karst region of southwest China
Characteristics of carbon, water, and energy fluxes on abandoned farmland revealed by critical zone observation in the karst region of southwest China
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西南岩溶地区临界区观测揭示废弃农田碳、水、能通量特征
DOI：
10.1016/j.agee.2020.106821
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发表时间：
2020
影响因子：
6.6
通讯作者：
Wang Shijie
中科院分区：
文献类型：
--
作者：
Wang Yanwei;Luo Weijun;Zeng Guangneng;Peng Haijun;Cheng Anyun;Zhang Lin;Cai Xianli;Chen Jia;Lyu Yina;Yang Hanling;Wang Shijie
近年来，我国西南喀斯特地区大面积的农业用地被废弃用于生态恢复，为该地区的绿化做出了贡献。然而，目前还没有直接观测到该地区废弃土地上的碳、水和能量通量。此外，由于地表和地下过程之间的耦合，需要从关键区的角度对岩溶生态系统进行监测。在普定喀斯特生态系统研究站自然恢复条件下的退耕地上，构建了空气-植被-土壤-洞穴一体化垂直观测系统。初步结果显示：结果表明：（1）植被覆盖在废弃后迅速恢复，雨季的净生态系统交换量（NEE）、土壤CO2通量、实际蒸散量（ETa）和潜热（LE）约为旱季的2倍，这种强烈的季节变化与雨季水热同步的亚热带季风气候特征有关。第二，高浓度的CO2和显着的CO2变化的监测洞穴表明，地下碳库与大气的交换在研究地点的碳收支不能忽视。
Extensive areas of agricultural land have been abandoned to ecological restoration in recent years in the karst region of Southwest China, which contributes to the greening of the area. However, there has yet no direct observation of carbon, water, and energy fluxes on abandoned land in the region. In addition, because of the coupling between above and below-ground processes, monitoring of the karst ecosystem needs to be conducted from a critical zone perspective. In this study, an integrated vertical observation system through air-vegetation-soil-cave continuums was constructed on abandoned farmland under natural restoration in Puding Karst Ecosystem Research Station. Preliminary results show that: First, vegetation cover restored rapidly after abandonment, and the measured net ecosystem exchange (NEE), soil CO2efflux, actual evapotranspiration (ETa) and latent heat (LE) in the rainy season are about twice of that in the dry season, this strong seasonal variation relates to the typical subtropical monsoon climate with synchronous water and heat availability during rainy season. Second, high CO2concentrations and significant CO2variation in the monitored cave indicate that the exchange of underground carbon pools with the atmosphere cannot be neglected in the carbon budget of the study site.