辽东栎叶片气孔密度及δ13C值的时空变异

doi:10.11707/j.1001-7488.20050205

林业科学 ›› 2005, Vol. 41 ›› Issue (2): 30-36.doi: 10.11707/j.1001-7488.20050205

辽东栎叶片气孔密度及δ¹³C值的时空变异

郑淑霞上官周平

中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,杨凌712100

收稿日期:2003-08-04 修回日期:1900-01-01 出版日期:2005-03-25 发布日期:2005-03-25

Tempo-Spatial Variations in the Stomatal Density and δ¹³C Value of Quercus liaotungensis Leaves

Zheng Shuxia,Shangguan Zhouping

State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources Yangling712100

Received:2003-08-04 Revised:1900-01-01 Online:2005-03-25 Published:2005-03-25

摘要/Abstract

摘要：

利用数码图像显微镜处理系统和稳定性碳同位素测定技术,对20世纪30—80年代不同年代不同植被区域内辽东栎叶片气孔密度及δ¹³C值的时空变异规律进行研究。结果表明,全国不同区域辽东栎气孔密度为535～800stoma·mm^-2 ,平均值为703 stoma·mm^-2 ,δ¹³C值为-28.47‰～-25.02‰,平均值为-26.83‰。从时间分布角度,由20世纪30—80年代,暖温带落叶阔叶林区域中辽东栎叶片气孔密度和δ¹³C值持续降低比较明显;亚热带常绿阔叶林区域中辽东栎叶片气孔密度呈增加趋势,而δ¹³C值呈降低趋势;青藏高原高寒植被区域中辽东栎叶片δ¹³C值呈增加趋势,但气孔密度几乎没有变化。从空间分布角度,30年代,暖温带落叶阔叶林、亚热带常绿阔叶林、青藏高原高寒植被3个区域中辽东栎气孔密度和δ¹³C值依次递减,说明水分利用效率(WUE)呈下降趋势;50年代,辽东栎气孔密度在4个植被区域之间产生波动,温带针阔叶混交林和亚热带常绿阔叶林2个区域中的辽东栎气孔密度比较接近,且高于气孔密度相差不大的暖温带落叶阔叶林和青藏高原高寒植被2个区域,4个植被区域类型之间辽东栎叶片δ¹³C值差异不大;80年代,辽东栎在由东到西分布的暖温带落叶阔叶林至温带草原区域,气孔密度和δ¹³C值均呈降低趋势。因此,从时空分布角度,除个别区域外,辽东栎在从20世纪30—80年代,由暖温带落叶阔叶林至亚热带常绿阔叶林、青藏高原高寒植被的时空分布上,气孔密度和δ¹³C值均呈降低趋势

关键词: 辽东栎, 气孔密度, &delta, ¹³C值, 时空变异

Abstract:

Making use of the Motic Digital Imaging microscope and the stable carbon isotope technique, the tempo-spatial variations in the stomatal densities and δ¹³C values in leaves of Quercus liaotungensis in different vegetation regions were studied. About 240 plant specimens in the years from 1930's to 1980's were taken from the Herberhem of Northwestern Institute of Botany, Chinese Academy of Sciences. The results showed that the variety ranges of stomatal densities and δ¹³C values in Q. liaotungensis were 535～800 stoma·mm^-2and -28.47‰～-25.02‰, respectively, with the mean value of 703 stoma·mm^-2 and -26.83‰, respectively. In warm temperate deciduous broadleaf forest (WTDB), the time distribution from 1930's to 1980's, both stomatal densities and δ¹³C values in Q. liaotungensis descended significantly. Correspondingly, in that period, stomatal densities increased but δ¹³C values descended in subtropical evergreen-broadleaf forest (STEB), and δ¹³C values increased but stomatal densities had little changes in the Ti-betan Plateau alpine-cold vegetation zone(TPAC). The tendency for space distribution showed that, in 1930's, stomatal densities and δ¹³C values of Q. liaotungensis in WTDB, STEB and TPAC all decreased, indicating that water use efficiency (WUE) of it all fell down in these regions. In 1950's, stomatal densities appeared a fluctuation in four vegetation regions, which were higher in temperate coniferous-broadleaf mixed forest (TCBM) and STEB than those in WTDB and TPAC. However, the δ¹³C values in four vegetation regions were little different. In 1980's, stomatal densities and δ¹³C values decreased from WTDB in the east to the temperate grassland region (TGR) in the west. Therefore, except several regions, the tempo-spatial distributions of stomatal densities and δ¹³C values in Q. liaotungensis all decreased from 1930's to 1980's in time and from WTDB, STEB to TPAC in space.

Key words: Quercus liaotungensis, stomatal density, &delta, ¹³C value, tempo-spatial variation

郑淑霞上官周平. 辽东栎叶片气孔密度及δ¹³C值的时空变异[J]. 林业科学, 2005, 41(2): 30-36.

Zheng Shuxia;Shangguan Zhouping. Tempo-Spatial Variations in the Stomatal Density and δ¹³C Value of Quercus liaotungensis Leaves[J]. Scientia Silvae Sinicae, 2005, 41(2): 30-36.

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辽东栎叶片气孔密度及δ¹³C值的时空变异

Tempo-Spatial Variations in the Stomatal Density and δ¹³C Value of Quercus liaotungensis Leaves

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