›› 2001, Vol. 9 ›› Issue (2): 121-127.DOI: 10.11733/j.issn.1007-0435.2001.02.009

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Potential Effect of Simulated Precipitation Change on the Evapotranspiration of Salix psammophylla Seedlings in Maowusu Sandland

XIAO Chun-wang   

  1. Laboratory of Quantitative Vegetation Ecology, Institute of Botany CAS, Beijing 100093
  • Received:2000-09-21 Revised:2001-01-13 Online:2001-05-15 Published:2001-05-15

模拟降水量对毛乌素沙柳幼苗蒸发蒸腾的潜在影响

肖春旺   

  1. 中国科学院植物研究所植被数量生态学开放研究实验室, 北京, 100093
  • 作者简介:肖春旺(1969- ),男,云南景洪人,大学讲师,中国科学院植物研究所博士生,主要从事全球变化研究.主持贵州省自然科学技术基金一项,参加国家973计划、中国科学院和国家自然基金委资助项目多项.发表论文20余篇
  • 基金资助:
    国家重点专项基础研究(G1999043407),中国科学院95重大项目B(KZ951-B1-108)和国家自然基金委95重点项目(49835010)

Abstract: Maowusu sandland is a typical dry and semi dry sandland in China.Water is the most important limited factor there.It is greatly affected for distribution pattern of terrestrial ecosystem and natural environment with great global change,especially global precipiatation change.The response of transpiration is investigated for seedlings of S.psammophylla, a dominant shrub in Maowusu sandland,to the global precipitation change by artificially controlling four water supply levels of 157.5 mm、315 mm、472.5 mm and 630 mm.The results show that evapotranspiration of S.psammophylla seeding increased with the increase in water supply in Maowusu sandland.The average daily evapotranspirations for four levels of water supply were 1.63 mm、3.11 mm、4.37 mm and 5.66 mm,respectively.And the evaporation contributed the main part in evapotranspiration.Transpiration rate of the seedlings showed strongly midday depression under low water supply,but not under full water supply.Correlation analysis showed that meteorological variables,such as containing water rate of sandland,photosynthetic available radiation,air temperature,saturated water vapour pressure difference,and physiological variables,such as leaf area index,leaf temperature,stomatal conductance,affected transpiration of S.psammophylla seedlings.

Key words: Simulated precipitation, Mawousu sandland, S.psammophylla seedlings, Evapotranspiration

摘要: 选择毛乌素沙地优势灌木沙柳为对象,研究15.5、315、42.5和630mm4种人控年降水量,对沙柳幼苗蒸发蒸腾作用的影响.结果表明,沙柳蒸发蒸腾量随着降水量的增加而逐渐增大,从15.5mm增至630mm,日蒸散量分别为1.63、3.11、4.3和5.66mm,其中沙地蒸发量占主要部分.少量降水时,幼苗蒸腾速率明显呈现"午睡”现象,而充足降水则能消除"午睡”现象.相关分析结果表明,环境因子,如沙地含水率、太阳有效辐射、大气温度和饱和水汽压差,以及植物因素,如叶面积指数、叶片温度和气孔导度等,均能显著影响沙柳的蒸腾作用.

关键词: 模拟降水量, 毛乌素沙地, 沙柳幼苗, 蒸发蒸腾作用

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