第 37 卷第 10 期 2017 年 5 月 生 态 学 报 ACTA ECOLOGICA SINICA Vol.37,No.10 May,2017 http: / / www.ecologica.cn 基金项目:国家自然科学基金青年基金(31200377) ;中国科学院战略性先导科技专项项目( XDA05050208) ;高等学校博士学科点专项科研基金 新教师类课题(20123228120003) 收稿日期:2016• 03• 08; 网络出版日期:2017• 02• 17 * 通讯作者 Corresponding author.E•mail: zhangm.80@ nuist.edu.cn DOI: 10.5846 / stxb201603080411 卫楠,张弥,王辉民,张雷明,温学发,刘寿东.散射辐射对亚热带人工针叶林光能利用率的影响.生态学报,2017,37(10) :3403• 3414. Wei N, Zhang M, Wang H M, Zhang L M, Wen X F, Liu S D.The impacts of changes in diffuse radiation on light use efficiency in a subtropical plantation coniferous forest.Acta Ecologica Sinica,2017,37(10) :3403• 3414.1 ,说明散射辐射可使该生态系统植被光合能力提高。 关键词:光能利用率;散射辐射;晴空指数;千烟洲亚热带人工针叶林 The impacts of changes in diffuse radiation on light use efficiency in a subtropical plantation coniferous forest WEI Nan 1 , ZHANG Mi 1, * , WANG Huimin 2 , ZHANG Leiming 2 , WEN Xuefa 2 , LIU Shoudong 1 1 Key Laboratory of Meteorological Disaster, Ministry of Education, International Joint Laboratory on Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Yale•NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China 2 Key Laboratory of Ecosystem Network Observation and Modeling, Synthesis Research Center of Chinese Ecosystem Research Network, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China Abstract: Changes in diffuse radiation received at the ground surface impact light use efficiency ( LUE) of the forest ecosystem. In this study, we focused on a subtropical plantation coniferous forest at Qianyanzhou. Based on 30 min flux data, routine meteorological data, and two indexes, clearness index ( k t ) and the ratio ( S f / S 0 ) of diffuse radiation ( S f ) to global solar radiation ( S 0 ) , we analyzed the impacts of changes in diffuse radiation on light use efficiency in this ecosystem during the mid•growing season ( June to August) from 2003 to 2012. Moreover, applying the modified light response model, we investigated effects of changes in diffuse radiation on vegetation photosynthetic characteristics. The results indicated that the LUE decreased by a mean of 44. 66% in k t range of 0. 6 to 0. 7 during the mid•growing season from 2003 to 2012, compared that in k t range of 0.4 to 0.5. In the same period, the LUE increased by a mean of 22.24% in S f / S 0 range of 70%
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