内蒙古羊草和大针茅草原下垫面水汽、CO2通量输送特征

王雷-;刘辉志;David Schaffrath;Christian Bernhofer

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高原气象 ›› 2010, Vol. 29 ›› Issue (3) : 605-613.
论文

内蒙古羊草和大针茅草原下垫面水汽、CO2通量输送特征

  • 王雷-;刘辉志;David Schaffrath;Christian Bernhofer
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摘要

利用涡动相关技术对2007年8月18日~9月12日在内蒙古羊草和大针茅草原样地上进行微气象观测, 比较了两种草原生态系统下垫面水汽、 CO2通量交换的差异, 结果表明: (1)羊草样地的气温、 地表温度和水汽压较小; 羊草和大针茅样地的地表反射率平均值分别为0.17和0.16; (2)受土壤水分胁迫控制, 羊草和大针茅样地的有效能量主要分配为感热通量, 平均波文比分别为3.70和2.69, 潜热通量在大针茅样地更大, 有随着土壤湿度持续减小而减小的趋势; (3)羊草和大针茅样地在观测期间表现为CO2的源, 日均释放率分别为0.97 g·CO2·m-2·d-1和0.43 g·CO2·m-2·d-1。受土壤水分胁迫和草地生理作用的控制, 日间羊草和大针茅样地都出现了CO2通量的衰减。

Abstract

Based on the eddy covariance measurements of Leymus chinensisand Stipa grandis steppesin Inner Mongolia from August 18 to September 12, 2007, the differences of water vapor flux and carbon flux exchange between the two kinds of grassland ecosystem surface are obtained. The main results are as follows. (1)Leymus surface had lower air temperature, surface temperature and water vapor pressure than Stipa one. The average albedos of Leymusand Stipasurfaces were separately 0.17 and 0.16. (2)Under soil water stress condition, most part of available energy dispersed in form of sensible heat flux both Leymusand Stipa sample sites. The latent heat flux of Stipa one was bigger than that of Leymus one and showed decreasing trend when soil moisture decreased. (3)During the measurements period, both Leymus and Stipa sites acted as source of carbon. The daily average values of CO2 flux were separately 1.18 g·CO2·m-2·d-1and 0.49 g·CO2·m-2·d-1. Controlled by soil water stress and physiological functionof grassland, depression of CO2 flux appeared during the daytime both the Leymusand Stipa surface.

关键词

内蒙古 / 半干旱草原 / 羊草草原 / 大针茅草原 / 水汽通量 / CO2通量

Key words

Inner Mongolia / Semi-arid grassland / Leymus chinensis ste / Stipa grandis steppe / Water vapor flux / CO2 flux

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王雷-;刘辉志;David Schaffrath;Christian Bernhofer. 内蒙古羊草和大针茅草原下垫面水汽、CO2通量输送特征. 高原气象. 2010, 29(3): 605-613

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