欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

一次降水过程对青藏高原高寒草甸CO2通量和热量输送的影响

张法伟1;李英年1;赵新全1;古松1;王勤学2;杜明远3;唐艳鸿2   

  1. 1中国科学院西北高原生物研究所, 西宁 810001;2日本国立环境研究所,日本筑波 3050053;3日本农业环境技术研究所, 日本筑波 3058604
  • 收稿日期:2008-03-26 修回日期:1900-01-01 出版日期:2008-10-10 发布日期:2008-10-10

Effects of one precipitation process on CO2 flux and thermal transportation in alpine meadow of Qinghai-Tibetan Plateau.

ZHANG Fa-wei1;LI Ying-nian1;ZHAO Xin-quan1;GU Song1;WANG Qin-xue2;DU Ming-yuan3;TANG Yan-hong2   

  1. 1Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;2National Institute for Environmental Studies, Tsukuba 3050053, Japan;3National Institute of Agroenvironmental Sciences, Tsukuba 3058604, Japan
  • Received:2008-03-26 Revised:1900-01-01 Online:2008-10-10 Published:2008-10-10

摘要: 青藏高原高寒草甸的热量输送和碳收支对气候变化的响应十分敏感,降水过程对其影响较为复杂。利用三维超声风速仪和红外CO2/H2O分析仪,以及常规微气象要素的涡度相关观测系统,分析了2002年8月8—17日的一次降水过程对青藏高原高寒草甸CO2通量和热量输送的影响。结果表明:降水过程使气温、地温和辐射等有所降低,大气湿度和CO2通量有所升高;气温、地温、总辐射、地表反射辐射、光合有效辐射(PAR)、净辐射、土壤热通量、潜热通量和显热通量分别下降了23.3%、23.1%、61.9%、58.9%、61.7%、57.9%、268.3%、61.6%和71.0%,大气湿度和CO2通量分别升高了27.0%和38.6%;降水削弱了PAR对白天净生态系统CO2交换量(NEE)的影响,而增加了地温对夜间呼吸的控制;降水强度对白天NEE几乎没有影响,但能降低夜间呼吸。

关键词: 桧叶金发藓, 泥炭沼泽, 无性系, 固有年际标记, 年龄结构

Abstract: The thermal transportation and carbon budget in alpine meadow of Qinghai-Tibetan Plateau are highly sensitive to climate change, but little research was made about the influence of precipitation because of its complicacy. Based on the data measured by three-dimensional ultrasonic anemometer and fast-response open-path infrared CO2/H2O analyzer, the effects of one precipitation process from 8-17 August, 2002 on the thermal transportation and CO2 flux in alpine meadow of northeastern Qinghai-Tibetan Plateau were analyzed. The results showed that the precipitation process decreased the air temperature, soil temperature, total radiation, surface reflected radiation, photosynthetically active radiation (PAR), net radiation, soil heat flux, latent heat flux, and sensible heat flux by 23.3%, 23.1%, 61.9%, 58.9%, 61.7%, 57.9%, 268.3%, 61.6%, and 71.0%, and increased the atmospheric humidity and CO2 flux by 27.0% and 38.6%, respectively. Precipitation weakened the influence of PAR on the daytime net CO2 exchange (NEE) of the alpine meadow ecosystem, but enhanced the effects of soil temperature on nighttime respiration. Precipitation intensity had no significant influence on the daytime NEE, but decreased the nighttime respiration.

Key words: Polytrichum juniperum, Mire, Clone, Innate annual marker, Age structure