安吉毛竹林非生长季CO_2通量与其光合响应关系探究  

Study on the response relationship between CO_2 flux and photosynthesis of Phyllostachys edulis forest during non-growing season in Anji,Zhejiang

作　　者：舒海燕[1] 江洪[1,2,3] 陈晓峰[2] 孙文文[2] 马锦丽[2] 张敏霞[2] SHU Haiyan;JIANG Hong;CHEN Xiaofeng;SUN Wenwen;MA Jinli;ZHANG Minxia(Key Laboratory of Eco-environments of Three Gorges Reservoir Region, Ministry of Education, Southwest University,Chongqing 400715, China;College of Forestry & Bio-technology, Zhejiang A & F University, Lin’an, Zhejiang 311300, China;International Institute for Earth System Science, Nanjing University, Nanjing 210046, China)

机构地区：[1]西南大学三峡库区生态环境教育部重点实验室,重庆400715 [2]浙江农林大学林业与生物技术学院,浙江临安311300 [3]南京大学国际地球系统科学研究所,江苏南京210046

出　　处：《生态科学》2017年第2期15-25,共11页Ecological Science

基　　金：国家自然科学基金(61190114和41171324);上海市科学委员会项目(12231205101);科技部国家科技基础条件平台项目"地球系统科学数据共享网"(2005DKA32300)

摘　　要：利用涡度相关法和生理生态法(光合)对安吉毛竹林生态系统非生长季(2014.10—2015.4,无2月)的CO_2通量进行测定,结果表明,两种方法具有良好的响应关系,基于涡度的生态系统净交换量(NEE)和基于光合的生态系统净初级生产力(NEP)日变化均呈单峰型曲线,受光合有效辐射(PAR)的直接影响,在午间12:00前后有最大值,且两者均表现为秋季最大(10月最高),春季次之,冬季最低。就各月而言,基于光合测定的NEP日最大值和月总量均低于涡度相关技术白天的测定值,但均占到后者的40%和65%以上,在毛竹光合能力比较强的10、11和4月,所占比例更大。表明在白天,安吉毛竹林生态系统的NEP主要取决于毛竹的光合作用。此外,观测期间,毛竹林生态系统在的净初级生产力总量为1365.59 gCO_2·m^(–2),吸收的碳约372.44 gC·m^(–2),整体表现为较强的碳汇。CO2fluxes of Phyllostachys edulis forest ecosystem during non-growing season(from October in2014to April in2015,but no February)in Anji,Zhejiang Province were measured by eddy covariance micrometeorological and ecophysiological method(photosynthesis of leaves).Both the results showed a good relationship.Diurnal variations of the net ecosystem exchange(NEE)based on eddy covariance micrometeorological method and the net ecosystem productivity(NEP)based on the eco-physiological method were single peak curves,and the maximum values were at around12:00noon,which were influenced by PAR directly.Moreover,NEE and NEP were the highest in autumn(October was the highest)and the lowest in winter.For months,the daily maximums and monthly totals of NEP based on photosynthesis method were lower than those measured by the eddy covariance technique during the day,but each accounted to over40%and65%out of the latter respectively.Especially in October,November and April,the proportions were greater because of the high photosynthesis of Phyllostachys edulis.What is more,during the non-growing season,the total NEP of Phyllostachys edulis forest ecosystem was1365.59gCO2·m-2,and the absorption of carbon was about372.44gC·m-2.That was,the ecosystem was a moderate carbon sink outside the growing season.

关 键 词：毛竹林生态系统 非生长季 涡度相关技术 光合作用 净初级生产力 

分 类 号：Q945.79[生物学—植物学] S718.5[农业科学—林学]