自然资源学报

自然资源学报 ›› 2001, Vol. 16 ›› Issue (2): 152-160.doi: 10.11849/zrzyxb.2001.02.009

• 论文 • 上一篇    下一篇

青藏高原东部生态系统土壤碳排放

刘允芬1, 欧阳华1, 曹广民2, 罗辑3, 张宪洲1, 赵新全2, 杨清伟3   

  1. 1. 中国科学院地理科学与资源研究所, 北京 100101;
    2. 中国科学院西北高原生物研究所, 青海西宁 810001;
    3. 中国科学院、水利部成都山地灾害与环境研究所, 四川成都 610041
  • 收稿日期:2000-06-30 修回日期:2000-09-20 出版日期:2001-04-25 发布日期:2001-04-25
  • 作者简介:刘允芬(1946-),女,天津市人,研究员,博士,农业气象专业,主要研究方向为农业生态系统对全球 变化的贡献与响应。
  • 基金资助:

    国家基础研究发展规划项目(G1998040800);中国科学院青藏高原研究项目(KZ951-A1-204;KZ95T-06)资助

Soil carbon emission from ecosystems of eastern Qinghai-Tibet Plateau

LIU Yun fen1, OUYANG Hua1, CAO Guang min2, LUO Ji3, ZHANG Xian zhou1, ZHAO Xin quan2, YANG Qing wei3   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Northwest Plateau Institute of Biology, CAS, Xining 810001, China;
    3. Instit ute of Mo untain Hazards and Enviro nment, Chinese Academy of Sciences and Minist ry of Water Co nservancy, Chengdu 610041, China
  • Received:2000-06-30 Revised:2000-09-20 Online:2001-04-25 Published:2001-04-25

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摘要： 在青藏高原探讨不同生态系统碳平衡规律及其影响因子并揭示其对全球含碳温室气体变化的影响与响应,有重要的现实意义和理论价值。分别在海北高寒草甸生态站、贡嘎山森林生态站和拉萨农业生态站用静态箱法进行了土壤CO2排放的试验研究。土壤CO2排放速率日平均值为草甸215.87～329.68mgCO2m-2h-1,森林713.72～2102.56mgCO2m-2h-1,农田913.05～1135.83mgCO2m-2h-1。土壤碳排放速率日变化,在农田和高寒草甸区表现为单峰型,均以地方时8∶00～16∶00最高,0∶00～8∶00最低。草甸、农田土壤碳排放随着牧草、作物生长发育的加速而逐渐增加,越接近成熟(或枯黄期)其值越低,林区以6～9月的生长旺季为最高。土壤碳排放与温度之间有较好的相关性,温度是影响土壤碳排放的重要因子,全球变暖有可能引起高原土壤碳排放的增加。

关键词: 青藏高原, 生态系统, 土壤CO2排放速率

Abstract: It is of practical significance and important scientific value to probe into carbonic balance in different ecosystems and its environmental factors affecting it,and to reveal its influence on and response to the changes of global carbonic greenhouse.Experimental studies of soil CO2 emission flux by enclosed chamber technique were conducted at Haibei Frigid Meadow Ecological Station,Gongga Mountain Alpine Forest Ecological Station,and Lhasa Agroecological Station.The diurnal mean value of soil CO2 emission flux was 215.87～329.68 mg CO2m-2h-1 in highland meadows,713.72～2,102.56mgCO2m-2 h-1 in alpine forests,and 913.05～1,135.83mgCO2m-2h-1 in farmlands.Daily change of soil CO2 emission flux showed a single peak in farmlands and growing frigid meadows,both reached the highest at local time of 8∶00 to 16∶00,and the lowest from 0∶00 to 8∶00. In farmland and meadow,soil CO2 emission increased along with the accelerating growth of crops and pasturage.Before closing to the ripening period,the value went down.However in forest area,the highest value of soil CO2 emission reached to a peak from June to September.We found that there was a good correlation between temperature and soil CO2 emission,and temperature appears an important factor affecting soil CO2 emission,so the global warming will very likely increase soil CO2 emission.

Key words: Qinghai Tibet Plateau, ecosystems, soil CO2 emission flux

中图分类号: 

  • S181