Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China
Impact of cloudiness on net ecosystem exchange of carbon dioxide in different types of forest ecosystems in China
复制标题
云量对我国不同类型森林生态系统二氧化碳净交换的影响
DOI：
10.5194/bg-7-711-2010
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发表时间：
2009-08
期刊：
影响因子：
4.9
通讯作者：
Yan, J. -H.
中科院分区：
文献类型：
--
作者：
Zhang, M.;Yu, G. -R.;Zhang, L. -M.;Sun, X. -M.;Wen, X. -F.;Han, S. -J.;Yan, J. -H.
云可以通过影响生态系统表面接收太阳辐射的数量和质量以及其他环境因子，显著影响森林生态系统与大气之间的碳交换过程。利用2003 ~ 2006年6 ~ 8月的数据，分析了云量对长白山阔叶红松混交林和鼎湖山亚热带常绿阔叶林生态系统净二氧化碳交换（NEE）的影响。结果表明，晴天和阴天条件下，森林生态系统NEE对光合有效辐射（PAR）的响应存在差异。2003年、2004年、2005年和2006年，阴天下CBS生长中期（6 ~ 8月）的光饱和最大光合速率（Pec,max）分别比晴空高34%、25%、4%和11%。2004 ~ 2006年，晴空条件下森林生态系统的Pec，max值高于阴天条件。当清晰度指数（kt）介于0.4 ~ 0.6之间时，NEE在CBS和DHS均达到最大值。然而，当kt超过0.6时，CBS的NEE比DHS下降得更明显。结果表明，阴天条件有利于温带森林生态系统和亚热带森林生态系统的净碳吸收。在晴朗天气下，由于强光，水汽压差（VPD）和气温升高。这些环境条件导致CBS的生态系统光合作用总量（GEP）下降幅度大于DHS，生态系统呼吸（Re）增加幅度大于DHS。结果表明，晴空条件对温带森林生态系统净净能量减少的影响大于亚热带森林生态系统。NEE的响应
Clouds can significantly affect carbon exchange process between forest ecosystems and the atmosphere by influencing the quantity and quality of solar radiation re- ceived by ecosystem's surface and other environmental fac- tors. In this study, we analyzed the effects of cloudiness on net ecosystem exchange of carbon dioxide (NEE) in a tem- perate broad-leaved Korean pine mixed forest at Changbais- han (CBS) and a subtropical evergreen broad-leaved forest at Dinghushan (DHS), based on the flux data obtained during June-August from 2003 to 2006. The results showed that the response of NEE of forest ecosystems to photosynthet- ically active radiation (PAR) differed under clear skies and cloudy skies. Compared with clear skies, the light-saturated maximum photosynthetic rate (Pec,max) at CBS under cloudy skies during mid-growing season (from June to August) in- creased by 34%, 25%, 4% and 11% in 2003, 2004, 2005 and 2006, respectively. In contrast, Pec,max of the forest ecosystem at DHS was higher under clear skies than under cloudy skies from 2004 to 2006. When the clearness index (kt ) ranged between 0.4 and 0.6, the NEE reached its max- imum at both CBS and DHS. However, the NEE decreased more dramatically at CBS than at DHS when kt exceeded 0.6. The results indicate that cloudy sky conditions are ben- eficial to net carbon uptake in the temperate forest ecosys- tem and the subtropical forest ecosystem. Under clear skies, vapor pressure deficit (VPD) and air temperature increased due to strong light. These environmental conditions led to greater decrease in gross ecosystem photosynthesis (GEP) and greater increase in ecosystem respiration (Re) at CBS than at DHS. As a result, clear sky conditions caused more reduction of NEE in the temperate forest ecosystem than in the subtropical forest ecosystem. The response of NEE of
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影响因子：
6.7
作者：
P. McCormick;H. Suehrcke
通讯作者：
P. McCormick;H. Suehrcke
影响因子：
7.4
作者：
Zhang De
通讯作者：
Zhang De
影响因子：
4.4
作者：
Gu, LH;Fuentes, JD;Black, TA
通讯作者：
Black, TA
影响因子：
4.4
作者：
Goulden, ML;Daube, BC;Wofsy, SC
通讯作者：
Wofsy, SC
影响因子：
4.3
作者：
Wilczak, JM;Oncley, SP;Stage, SA
通讯作者：
Stage, SA