不同区域典型植被类型的净生态系统碳交换特征

发布时间：2018-02-02 20:26

本文关键词： 全球通量网碳通量净生态系统碳交换植被类型　出处：《兰州大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【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.
[Abstract]:The data set of GSM is used to analyze North America and Europe in detail. The change characteristics of carbon exchange in net ecosystem under different vegetation types in three major regions of Asia. The results show that:. The regional variation characteristics of carbon exchange in net ecosystem were closely related to the distribution of vegetation types. The total CO_2 budget of the three regions was -0.010 93 kg/a. Among them, the carbon absorption capacity of farmland and evergreen coniferous forest is the strongest, and that of grassland is the weakest. Although the diurnal variation range of net ecosystem carbon exchange in different vegetation types is obviously different, all of them show "U" curve, and the net ecosystem carbon exchange is negative during the day. The peak of carbon absorption rate appeared at 10: 00-12: 00 in the morning. The carbon exchange of net ecosystem in different latitudes showed obvious seasonal variation. With the increase of latitude, the carbon absorption capacity of vegetation gradually weakened, and the climate factors such as precipitation, soil moisture and other climatic factors had a great impact on the middle and high latitudes.
【作者单位】：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;
【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)
【分类号】：X171.1
【正文快照】： 随着科学技术水平的提高,工农业不断发展,能源利用增多,大气C02质量分数持续升高,频繁的人类活动严重影响了陆地生态系统碳循环的过程'自工业革命以来,由于化石燃料排放和土地利用变化导致的净排放,2011年大气中的C02质量分数超过工业化前水平的40%.C02等温室气体含量的大幅

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