Little direct effect of diurnal temperature amplitude on growing seasonal CO_2 fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau

Zhu Jingbin; Li Hongqin; Zhang Fawei; He Huidan; Li Yingnian; Yang Yongsheng; Zhang Guangru; Wang Chunyu; Luo Fanglin

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Little direct effect of diurnal temperature amplitude on growing seasonal CO_2 fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau

机译：昼夜温度振幅对高寒湿灌木，青藏高原生长季节性CO_2势态的直接效应

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The amplitude of the diurnal temperature (ADT) has been decreasing under climate change, with substantial anticipated effects on alpine grassland carbon budgets. Here, we quantified the temporal response of the growing seasonal CO(2)fluxes to ADT over alpine shrubland on Qinghai-Tibetan Plateau (QTP) from 2003 to 2016. At a daily scale, net ecosystem exchange (NEE) and gross primary production (GPP) quadratically responded to ADT with optimum values of 15.4 and 13.4 degrees C, respectively. Ecosystem respiration (RES) negatively linearly correlated with ADT. Partial correlation, and classification and regression trees (CART) analysis, both showed that the maximal (MaxTa) or minimal air temperature (MinTa), rather than ADT, played much more important role in daily variations of CO(2)fluxes. At a monthly scale, GPP and NEE were both positively and negatively controlled by MaxTa while RES was negatively determined by MinTa, respectively. Monthly ADT exerted a negligible influence on monthly CO(2)fluxes. At an annual scale, only MaxTa played a significant role in variations of GPP and RES. NEE did not significantly respond to ADT, MaxTa or MinTa. The little direct correlations between NEE and ADT at daily, monthly or annual scales contradicts a previous hypothesis that a larger ADT would enhance carbon sequestration capacity over alpine ecosystems. Given the positive impact of MaxTa on GPP and MinTa on RES, our study would suggest that a decreasing ADT could indirectly stimulate more carbon loss and weaken the carbon sequestration capacity of alpine shrublands under the scenario of further increases in MinTa over QTP.

机译：昼夜温度（ADT）的幅度在气候变化下降，对高山草原碳预算具有大量预期的影响。在这里，我们量化了2003年至2016年青藏高原（QTP）在高山灌木丛中对ADT的季节性CO（2）款的时间响应。每日规模，净生态系统交易所（NEE）和总主要生产（ GPP）分别与最佳值为15.4和13.4摄氏度的ADT。生态系统呼吸（RES）与ADT负相关。部分相关性和分类和回归树（推车）分析，两者都表明最大（Maxta）或最小的空气温度（minta）而不是ADT，在每日CO（2）通量的日常变化中起着更重要的作用。在每月规模，GPP和NEE均由MaxTA积极且负面控制，而RES分别由Minta否定。每月ADT对每月CO（2）款的助势产生了可忽略不计的影响。在年度规模中，只有Maxta在GPP和RE的变化中发挥了重要作用。 NEE没有显着响应ADT，Maxta或Minta。 NEE和ADT之间的一点直接相关性，每月或年度尺度都与先前的假设相矛盾，即较大的ADT会增强高山生态系统的碳封存能力。鉴于Maxta对res GPP和Minta的积极影响，我们的研究表明，降低ADT可以间接刺激更多的碳损失，并在QTP的进一步增加的情况下削弱高山灌木丛的碳封存能力。

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来源
《Ecological research》 |2020年第4期|603-612|共10页
作者
Zhu Jingbin; Li Hongqin; Zhang Fawei; He Huidan; Li Yingnian; Yang Yongsheng; Zhang Guangru; Wang Chunyu; Luo Fanglin;
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作者单位

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China|Univ Chinese Acad Sci Beijing Peoples R China;

Luoyang Normal Univ Coll Life Sci Luoyang Peoples R China;

Luoyang Normal Univ Coll Life Sci Luoyang Peoples R China;

Zaozhuang Univ Coll Tourism Resources & Environm Zaozhuang Peoples R China;

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China;

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China;

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China|Univ Chinese Acad Sci Beijing Peoples R China;

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China|Univ Chinese Acad Sci Beijing Peoples R China;

Chinese Acad Sci Key Lab Adaptat & Evolut Plateau Biota Northwest Inst Plateau Biol Xining Peoples R China|Univ Chinese Acad Sci Beijing Peoples R China;

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正文语种 eng
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amplitude of diurnal temperature; carbon fluxes; classification and regression trees; net ecosystem exchange; Qinghai-Tibetan Plateau;

机译：昼夜温度的幅度;碳通量;分类和回归树;净生态系统交流;青海 - 藏高原;

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专利

1. Diurnal, seasonal and annual variation in net ecosystem CO2 exchange of an alpine shrubland on Qinghai-Tibetan plateau [J] . Zhao LA, Li YN, Xu SX, Global change biology . 2006,第10期

机译：青藏高原高寒灌丛净生态系统CO 2交换的日，季，年变化
2. Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China [J] . Li Hongqin, Zhang Fawei, Li Yingnian, Agricultural and Forest Meteorology . 2016,第Null期

机译：青藏高原高寒灌丛10年来CO2通量的季节变化和年际变化
3. Growth stage-dependant variability in water vapor and CO2 exchanges over a humid alpine shrubland on the northeastern Qinghai-Tibetan Plateau [J] . Li Hongqin, Zhu Jingbin, Zhang Fawei, Agricultural and Forest Meteorology . 2019,第期

机译：在青藏高原高原东北部潮湿的高山灌木丛中，水蒸气和二氧化碳交易的增长阶段依赖性变异
4. The diurnal and seasonal variation of land surface heat fluxes over the central Tibetan Plateau area [C] . Y. Ma, H.Ishikawa, O.Tsukamoto, International Symposium on Asian Monsoon System . 2004

机译：藏上高原地区陆地表面热通量的昼夜和季节变化
5. Insights on Seasonal Fluxes in a Desert Shrubland Watershed from a Distributed Sensor Network. [D] . Templeton, Ryan. 2011

机译：分布式传感器网络对荒漠灌木丛流域季节性通量的见解。

Little direct effect of diurnal temperature amplitude on growing seasonal CO_2 fluxes in alpine humid shrubland, Qinghai-Tibetan Plateau

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