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Subject: 地理学::自然地理学
Title: 青藏高原不同下垫面CO2通量的变化特征分析
Author: 朱志鹍
Issued Date: 2008
Supervisor: 马耀明
Major: 自然地理学
Degree Grantor: 中国科学院研究生院
Place of Degree Grantor: 北京
Degree Level: 硕士
Keyword: 青藏高原 ;  草地生态系统 ;  生长季 ;  涡度相关 ;  CO2通量 ;  日变化 ;  月总量
Call Number: S000012
Department: 图书馆
Abstract: 本论文利用中国科学院青藏高原研究所纳木错圈层相互作用综合观测研究站2005年9月至2006年9月的涡度相关观测资料,中国科学院珠穆朗玛峰大气与环境综合观测研究站的移动观测点-曲宗站2005年5月至2006年3月的涡度相关观测资料,中国科学院藏东南高山环境综合观测研究站即林芝站2007年5~8月的涡度相关观测资料,对于这三处草地生态系统CO2的日变化及季节变化进行了对比分析,给出了生长季各月的碳收支的状况。本论文得到的一些主要结论如下: 1. 青藏高原不同地区不同植被类型生长季节CO2通量日变化相比较,草地生态系CO2净吸收速率最大值,纳木错地区(0.57 g m-2h-1)< 曲宗地区(0.86 g m-2h-1)< 林芝地区(1.17 g m-2h-1)。 2. 生长季林芝地区降雨量是比较充足的,草地生态系统白天CO2吸收速率是较高的,但是夜晚的CO2的释放速率也较高。主要是由于夜晚林芝地区具有较高的气温,土壤温度、土壤含水量也较高,生态系统的呼吸作用和其他站点相比,应该是比较强的,所以林芝地区草地生态系统CO2月吸收量并不是最高。而纳木错地区草地,由于生长季夜间温度较低,抑制了生态系统呼吸作用,有利于生态系统形成碳汇,所以纳木错地区草地生态系统生长季8月份CO2月吸收总量反而高于林芝地区草地生态系统。 3. 在生长季的白天,CO2通量的变化与太阳辐射有着很好的相关。光合有效辐射(PAR)是影响植物光合作用的主要限制因子,生态系统植物的光合能力与植物的叶面积指数(LAI)又密切相联。青藏高原草地生态系统的LAI一般在8月份达到最大,但和世界上其他草原相比,叶面积指数仍很偏小。进入生长季后,随着温度的回升,植物在进入5份以后逐渐返青并开始生长,CO2吸收量逐渐增加。日出后,随着气温和太阳辐射的增强,植物光合作用和呼吸作用及土壤呼吸都迅速增加,但可能由于呼吸作用比光合作用增加得快,所以导致各站点CO2吸收速率最大值一般出现在中午之前,而并不是在太阳辐射最强的中午。
English Abstract: Based on the eddy covariance measurement from September 2005 to September 2006 over the grassland at Namco Monitoring and Research Station for Multi-sphere Interactions, from May 2005 to March 2006 at Quzong site of Atmospheric and Environmental Comprehensive Observation and Research Station and from May to August in 2007 at Integrated observation and research Station for alpine environment in South-East Tibet, the diurnal course and seasonal variance of CO2 flux is analyzed contradistinctively. Some significative conclusions are showed as follow: 1. Compared the diurnal variation of CO2 flux of different grassland ecosystem at different measurement stations of Tibetan Plateau, we find that the maximum value of CO2 uptake of grassland ecosystem in Linzhi is higher than that in Quzong. The maximum value of CO2 uptake of grassland ecosystem is the lowest. 2. The precipitation was sufficient in the growing season at Linzhi station. Therefore, the CO2 uptake velocity of grassland ecosystem is high in daytime and the efflux was high in nighttime as well. This mainly resulted from the high air and soil temperature and soil humidity at night. The ecosystem respiration was more active than that in other stations, which resulted that the monthly total CO2 uptake was not the maximum. In contrast, the lower nighttime temperature in the grassland of growing season at Namco station constrained the respiration. Consequently, it made the grassland ecosystem at Namco station likely to be a sink of carbon. As a result, the monthly total CO2 uptake in August at Namco was higher than that at Linzhi station. 3. The correlation analysis showed that solar radiation was the major environmental factor determining the CO2 flux in the daytime during the growing season. The photosynthesis also had a close relationship with LAI (Leaf Area Index). Compared with the grassland ecosystem LAI of other areas in the world, the LAI was smaller. When growing season began, the plant turned green in May as the temperature rising. In the daytime as the temperature rising and the radiation getting intense, the photosynthesis and respiration were both active. The maximum CO2 influx appeared before 12:00 .
Language: 中文
Content Type: 学位论文
URI: http://ir.itpcas.ac.cn/handle/131C11/1205
Appears in Collections:图书馆_学位论文

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Recommended Citation:
朱志鹍.青藏高原不同下垫面CO2通量的变化特征分析[硕士].北京.中国科学院研究生院.2008
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