Cloudiness regulates gross primary productivity of a poplar plantation under different environmental conditions
Cloudiness regulates gross primary productivity of a poplar plantation under different environmental conditions
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DOI：
10.1139/cjfr-2016-0413
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发表时间：
2017-01
影响因子：
2.2
通讯作者：
Hang Xu;Zhiqiang Zhang;Jiquan Chen;Mengxun Zhu;Manchun Kang
中科院分区：
文献类型：
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作者：
Hang Xu;Zhiqiang Zhang;Jiquan Chen;Mengxun Zhu;Manchun Kang
云量通过改变森林生态系统的辐射成分和其他环境因子来调节森林生态系统的总初级生产力（GPP）。利用开放路径涡旋相关方差系统和安装在中国北方杨树人工林上的小气候传感器，对2014年和2015年杨树生长中期（6 - 8月）的碳交换和气候变量进行了测量。结果表明，当净度指数（CI）在0.45 ~ 0.65之间时，人工林的GPP达到最大值，此时弥漫性光合有效辐射（PARdif）达到最大值。与晴空相比，阴天使最大生态系统光合能力（Pmax）提高了28%。阴天条件下，对人工林光合生产力影响最大的因子是PARdif，影响最小的因子是土壤湿度。较低的蒸汽压差（VPD < 1.5 kPa）、较低的气温（Ta < 30℃）和较低的温度下，生态系统光合潜力较高。
Cloud cover regulates the gross primary productivity (GPP) of forest ecosystems by changing the radiation component and other environmental factors. In this study, we used an open-path eddy covariance system and microclimate sensors installed over a poplar plantation in northern China to measure the carbon exchange and climate variables during the mid-growing seasons (June to August) in 2014 and 2015. The results indicated that the GPP of the plantation peaked when the clearness index (CI) was between 0.45 and 0.65, at which point diffuse photosynthetically active radiation (PARdif) had reached its maximum. Cloudy skies increased the maximum ecosystem photosynthetic capacity (Pmax) by 28% compared with clear skies. PARdif and soil moisture were the most and the least crucial drivers for photosynthetic productivity of the plantation under cloudy skies, respectively. The ecosystem photosynthetic potential was higher under lower vapor pressure deficit (VPD < 1.5 kPa), lower air temperature (Ta < 30 °C), and ...