不同土地利用方式下土壤呼吸碳通量动态.doc



不同土地利用方式下土壤呼吸碳通量动态#
徐霞,兰玉芳,蒋力,徐粒*
(北京师范大学地表过程与资源生态国家重点实验室,北京 100875)
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摘要:作为大气 CO2 的重要来源,土壤 CO2 排放成为全球碳循环研究的热点,随着经济的高
速发展,人类对生态系统的干扰在不断加强,表征人类活动的土地利用方式的变化直接影响
了土壤的呼吸过程,因此,本文以内蒙古自治区太仆寺旗的三种土地利用方式为研究对象,
利用静态厢式法测量不同土地利用类型的土壤 CO2 排放量,采用模型模拟的方法得到日累积
和月累积碳排放量,得到如下结论:土地利用类型不同,土壤碳排放的日变化曲线呈现不同
的趋势,草地生态系统呈现单峰变化趋势,而农田则呈现双份变化的趋势;累积碳排放量也
存在较大的差异,主要是羊草群落>农田>针茅群落;农田的土壤呼吸对温度变化的敏感性高
于草地,就意味着在全球变暖的背景下,开垦草原造成碳的净释放极有可能是大气碳库一个
重要的碳源。
关键词:生态系统生态学;土地利用;土壤呼吸;碳通量
中图分类号:
The dynamic soil carbon flux under different land uses
Xu Xia, Lan Yufang, Jiang Li, Xu Li
(State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal
University, Beijing 100875)
Abstract: As an important source of atmospheric CO2, soil CO2 emissions e the research
focus of global carbon cycle, with the rapid economic development, human disturbance on
ecosystems continues to grow, land-use changes directly impact the soil respiration process,
therefore, this paper selected three land use type in Taipusi Inner Mongolia, using a static chamber
measurement, Measured the soil CO2 emissions of different land use types, using the model
simulation method, calculated the day accumulated value and monthly accumulated value on
carbon emissions, the conclusions is followed: land use types is different, soil carbon emissions on
curves show different trends, grassland ecosystem show a single peak, while the field is showing
double peak change in the trend; cumulative carbon emissions was a big difference , Leymus
munity> Farmland> Stipa munities; soil respiration of farmland was
sensitive to temperature change than grass, in the context of global warming, it means that
release of carbon caused by reclamation is very likely an important carbon source of
the atmosphere carbon pool.
Keywords: Ecosystem ecology; land use; soil respiration; carbon flux
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0 引言
土壤 CO2 排放是大气 CO2 的一个重要来源。通过土壤呼吸作用向大气释放的 CO2 约占
全球 CO2 交换的 25%[1],因此,土壤呼吸成为全球碳循环研究的热点。随着人口压