首页|祁连山高寒草甸非生长季碳水通量及其影响因素

祁连山高寒草甸非生长季碳水通量及其影响因素

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高寒草甸作为主要的高寒生态系统之一,其非生长季的碳水平衡地位对整个生态系统具有重要意义.但该季节碳水通量的环境驱动因素知之甚少.因此,本研究基于涡动观测与气象梯度塔,探讨祁连山高寒草甸非生长季(2022年11月—2023年4月)的碳水通量及其影响因素.研究结果表明,祁连山高寒草甸生态系统,整个非生长季净生态系统碳交换量(net ecosystem carbon exchange,NEE)、总初级生产力(gross primary productivity,GPP)和生态系统呼吸(ecosystem respiration,Reco)分别为-18.0574 mg CO2·m-2、27.3565 mg CO2·m-2和9.2991 mg CO2·m-2.总蒸散发(ET)为74.8762 mm,比总降水量低15.0762 mm,该生态系统水循环较为平衡.在非生长季归一化植被指数、光合有效辐射和土壤温度是影响净生态系统碳交换量的主要因素.而相对湿度、降水和净辐射是影响非生长季蒸散发的主要因素.本研究结果揭示了祁连山高寒草甸非生长季的二氧化碳通量和水通量特征及其影响因素,为了解该地区碳收支过程和水平衡及其对气候变化的响应提供了重要参考.
Net ecosystem CO2 exchange in alpine meadows in the Qilian Mountains during the non-growing season and its influencing factors
As one of the major alpine ecosystems,the carbon-water balance status of alpine meadows during the non-growing season is of great significance to the whole ecosystem.However,little is known about the environ-mental drivers of carbon and water fluxes during this season.Therefore,this study investigates the carbon and water fluxes and their influencing factors during the non-growing season(from Nov.2022 to Apr.2023)in al-pine meadows in the Qilian Mountains based on eddy observations and meteorological gradient towers.It was found that in the alpine meadow ecosystem of the Qilian Mountains,during the entire non-growing season,the net ecosystem carbon exchange(NEE),gross primary productivity(GPP),and ecosystem respiration(Reco)were-18.0574 mg CO2·m-2,27.3565 mg CO2·m-2,and 9.2991 mg CO2·m-2,respectively.The total evapotrans-piration(ET)was 74.8762 mm,which was 15.0762 mm lower than the total precipitation,and the water cycle of this ecosystem was relatively balanced.Normalised vegetation index,photosynthetically active radiation and soil temperature were the main factors affecting net ecosystem carbon exchange during the non-growing season.Whereas relative humidity,precipitation and net radiation were the main factors affecting evapotranspiration in the non-growing season.The results of this study revealed the characteristics of carbon dioxide fluxes and water fluxes during the non-growing season in alpine meadows in the Qilian Mountains and their influencing factors,which provide an important reference for understanding the carbon balance process and water balance in the re-gion and its response to climate change.

carbon fluxevapotranspirationeddy correlationalpine meadownon-growing season

张文豹、辛惠娟、李宗省、张瑜、唐彪、徐崇

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兰州交通大学 环境与市政工程学院,甘肃 兰州 730070

中国科学院 西北生态环境资源研究院 祁连山同位素生态水文与国家公园观测研究站/干旱区生态安全与可持续发展重点实验室,甘肃 兰州 730000

西北师范大学 地理与环境科学学院,甘肃 兰州 730070

新疆和田地区气象局 皮山县气象局,新疆 皮山 845150

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碳通量 蒸散发 涡度相关 高寒草甸 非生长季

国家自然科学基金区域创新发展联合基金重点项目国家重点研发计划项目甘肃省拔尖领军人才项目中国科学院青年交叉团队项目中国科学院"西部之光-西部交叉团队"项目-重点实验室合作研究专项甘肃省自然基金创新群体项目

U22A205922020YFA0607702JCTD-2022-1820JR10RA038

2024

10.7522/j.issn.1000-0240.2024.0056

冰川冻土
中国地理学会 中国科学院寒区旱区环境与工程研究所

冰川冻土

CSTPCD
影响因子：2.546
ISSN：1000-0240
年,卷(期)：2024.46(2)
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