太阳辐射变化对千烟洲亚热带人工针叶林净CO_2交换量的影响  

Effects of changes in solar radiation on net ecosystem exchange of carbon dioxide of planted subtropical coniferous forest in Qianyanzhou

作　　者：王萌萌[1] 张弥[1,2,3] 王辉民[4] 张雷明[4] 杨沈斌[1,3] 

机构地区：[1]南京信息工程大学应用气象学院,南京210044 [2]南京信息工程大学-耶鲁大学大气环境研究中心,南京210044 [3]南京信息工程大学江苏省农业气象重点实验室,南京210044 [4]中国科学院地理科学与资源研究所,生态系统网络观测与模拟重点实验室,北京100101

出　　处：《生态学杂志》2015年第2期303-311,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(31200377)资助

摘　　要：太阳辐射是植被进行光合作用的重要驱动因子,影响着森林生态系统的净CO2吸收。本研究基于千烟洲亚热带人工针叶林30 min的通量和常规气象数据,以晴空指数为指标,分析了2003-2010年太阳辐射变化对该森林生态系统净CO2交换（NEE）的影响。结果表明：在晴空指数为0.4-0.6的中等辐射条件下NEE达到最大;与晴朗天空的强太阳辐射相比,中等辐射条件下散射辐射增加、气温以及饱和水汽压差的下降是NEE增加的原因;晴空指数在0.4-0.5和0.5-0.6的NEE显著大于晴空指数在0.7-0.8的NEE;该地晴空指数在0.6-0.7和0-0.1出现的频率较大,表明该地经常出现的天空状况以及对应的太阳辐射强度不是提高该生态系统净CO2吸收的最适条件。Solar radiation drives photosynthesis of ve by ground surface affect the net ecosystem exchange getation. Changes in solar radiation received of carbon dioxide （NEE） of forest ecosys- tem. In this study, we obtained 30-min flux data and routine meteorological data at a planted sub- tropical coniferous forest in Qianyanzhou station. The clearness index was used to quantify the change in sky condition. Based on these data and index, the effects of changes in solar radiation received by ground surface on NEE were analyzed in mid-growing season （June to August） from 2003 to 2010. The results showed that NEE reached its maximum when the clearness index was 0.4-0.6 （a middle intensity of solar radiation）. Compared with clear sky condition, the increase of diffuse radiation and the decrease of air temperature and vapor press deficit （ VPD ） under cloudy sky condition led to the increase of NEE. The NEE with clearness index of 0.4-0.5 and 0.5-0.6 was significantly higher than that with clearness index of 0.7-0.8. Clearness index with values of 0.6-0.7 and 0-0.1 occurred more frequently, suggesting that the sky condition and so-lar radiation received by ground surface under this condition were not optimal for the net carbon uptake of this forest ecosystem.

关 键 词：人工针叶林 净CO2交换 晴空指数 太阳辐射 

分 类 号：S718.5[农业科学—林学]