羊草草原碳循环过程的模拟与验证
Simulation of the Carbon Cycle in the Meadow Steppe Dominated by Leymus Chinensis
查看参考文献32篇
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文摘
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根据内蒙古典型羊草草原碳通量和生物量观测数据,验证VIP(Vegetation Interface Processes)模型,并模拟分析1958-2007年该生态系统碳循环特征及其与环境因子的相关关系.结果显示:VIP模型能够较准确地模拟地上生物量(R~2=0.70)和净生态系统生产力NEP(R~2=0.57)的变化趋势.羊草草原生态系统总初级生产力(GPP)、净初级生产力(NPP)和生态系统呼吸(R_e)在1958-1973年间下降,1973-1993年间增长,1993年后又出现下降的趋势.与环境因子的相关性分析表明,GPP、NPP和R_e随CO_2和降水的增多而增大,随温度升高和降水的减少而降低,其中降水量与碳通量相关性最高,呼吸与温度、降水、CO_2均存在一定程度的正相关关系.NEP年际变化较大,主要受控于年降水量,以228 mm为界,年降水量大于此值时,NEP为正的概率较大. |
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其他语种文摘
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The Vegetation Interface Processes (VIP) model was used to simulate carbon cycle in the typical steppe dominated by Leymus chinensis in Inner Mongolia. The characteristics of carbon cycle and the relationship between carbon cycle and environmental factors were analyzed. Results showed that the model is successful in simulating variation of the aboveground biomass and net ecosystem production (NEP). Ecosystem primary production and respiration (R_e) were decreasing during 1958 to 1973, and then kept increasing until 1993, after that decreased again. Sensitivity analysis showed the carbon cycle variation is more related with precipitation than other environmental factors, and R_e is influenced by all the three factors. Increase in the gross primary production (GPP), net primary production (NPP) and R_e are attributed mainly to the increasing precipitation and CO_2 concentration, the increase in temperature and decrease in precipitation make them decrease. There are great interannual variations of carbon budget during 1958 to 2007 in the study site. There is a close relationship between NEP and precipitations, showing that NEP turns from negative to positive while annual precipitation is greater than 228 mm. |
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来源
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自然资源学报
,2010,25(1):60-70 【核心库】
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关键词
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气候变化
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碳循环
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VIP模型
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羊草草原
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地址
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1.
中国科学院,地理科学与资源研究所, 水循环及地表过程重点实验室, 北京, 100101
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中国科学院,研究生院, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-3037 |
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学科
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普通生物学 |
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基金
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国家863计划
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科技部"973"中国陆地生态系统碳循环及其驱动机制研究项目
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中国科学院地理科学与资源研究所知识创新工程领域前沿项目
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文献收藏号
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CSCD:3822142
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