不同区域典型植被类型的净生态系统碳交换特征  

Characteristics of net ecosystem CO_2 exchange over typical vegetation types above different regions

作　　者：药静宇 王国印[1] 李晨蕊 于海鹏[1] Yao Jing-yu Wang Guo-yin Li Chen-rui Yu Hai-peng(Key Laboratory for Semi-Arid Climate Changes with the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, Chin)

机构地区：[1]兰州大学大气科学学院半干旱气候变化教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2017年第5期622-627,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重大科学研究计划项目(2012CB955302);公益性行业(气象)科研专项(重大专项)(GYHY201506001-1);国家自然科学基金项目(41405010);中央高校基本科研业务费专项资金项目(lzujbky-2014-102;lzujbky-2015-ct03;lzujbky-2017-it18)

摘　　要：利用全球通量网数据集,详细分析了北美、欧洲、亚洲3个主要区域不同植被类型下净生态系统碳交换的变化特征.结果表明:净生态系统碳交换的区域变化特征与植被类型的分布特征密切相关.3个地区CO_2的总体收支为-0.010 93 kg/a,其中,农田和常绿针叶林的碳吸收能力最强,草地的最弱;虽然各地区不同植被类型下净生态系统碳交换的日变化幅度存在明显差异,但均呈"U"型曲线,净生态系统碳交换白天为负值,夜间则相反.碳吸收速率峰值出现在上午10:00-12:00;不同纬度带净生态系统碳交换均表现出明显的季节变化,随纬度升高,植被的碳吸收能力逐渐减弱,中高纬度受降水、土壤湿度等气候因子的影响波动性较大.The characteristics of net ecosystem CO2 exchange（NEE） over three regions（North America,Europe and Asia） in different typical vegetation types has been analyzed using the global network flux data sets and the results showed that the average NEE over the study region was-1.093 × 10^（-2） kg/a. The spatial distribution of NEE was highly related to the variation of vegetation types. The croplands and evergreen needle leaf forest vegetation type had the strongest CO2 absorption capacity, with the grassland having the weakest. It also showed a peak carbon absorption rate at approximately 10：00-12：00 am over all of the vegetation types. The diurnal cycle of NEE was an evident ＂U＂ shaped curve with negative values during the daytime and reversed values during nighttime. The seasonal variation of NEE was obvious in different latitudes, and the absorptive capacity of carbon was decreased in relation with the increase of the latitudes. The annual cumulative NEE in mid-latitudes was sensitive to the variations of precipitation and soil moisture.

关 键 词：全球通量网 碳通量 净生态系统碳交换 植被类型 

分 类 号：P461.8[天文地球—大气科学及气象学]