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中国沙漠 ›› 2005, Vol. 25 ›› Issue (3): 374-379.

• 研究论文 • 上一篇    下一篇

沙漠人工植被区蒸腾测定

张志山, 李新荣, 王新平, 张景光   

  1. 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站, 甘肃兰州 730000
  • 收稿日期:2004-04-17 修回日期:2004-09-17 出版日期:2005-06-20 发布日期:2005-06-20
  • 作者简介:张志山(1974-),男(汉族),甘肃古浪人,在读博士,主要从事干旱区生态的研究。E-mail:zhangzhsh2002@yahoo.com.cn
  • 基金资助:
    国家自然基金(90202015;40301008)资助

Transpiration in Artificially Re-vegetated Desert Area

ZHANG Zhi-shan, LI Xin-rong, WANG Xin-ping, ZHANG Jing-guang   

  1. Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2004-04-17 Revised:2004-09-17 Online:2005-06-20 Published:2005-06-20

摘要: 利用表面覆盖油毡的大型非称重式蒸渗池和LI1600气孔计测定油蒿(Artemisiaordosica)和柠条(Caraganakorshinskii)的蒸腾,比较了两种测定方法是否存在差异。结果表明蒸渗池表面自油毡覆盖至试验结束,油蒿、柠条和流沙处理0~150cm土层土壤含水量都增加,尤其流沙处理土壤含水量上升最明显;油蒿与柠条的冠幅、新梢长和叶面积指数均增加;由于中子仪探测不到蒸渗池底部40cm厚的砾石层的水分,导致了对照流沙处理测定结果不合常规。测定日期不同,LI1600气孔计测定的蒸腾速率的变化趋势和值也不同,但油蒿和柠条的变化步调是一致的,油蒿的蒸腾速率普遍高于柠条的;用多项式拟合得到蒸腾速率日变化曲线均达到显著水平(P < 0.05)。通过单位换算统一和尺度转换,蒸渗池和LI1600气孔计测定结果进行方差分析,表明物种间(油蒿和柠条)差异达显著水平(P < 0.05),测定方法间(蒸渗池和LI1600气孔计)差异不显著;从而说明本研究以叶面积指数和植物冠层盖度为基础,进行叶片水平与种群水平间的尺度转换是可行的。

关键词: 沙漠人工植被区, 植物蒸腾, 蒸渗池, LI-1600气孔计, 尺度转换

Abstract: The experiment based on non-weighing lysimeter covered with bitumen felt and LI-1600 stoma meter aimed to determine the transpiration of Artemisia ordosica and Caragana korshinskii in re-vegetated desert area, and compared the results. The results showed that the soil water contents of sand, A. ordosica and C. korshinskii vegetation in lysimeters all increase due to bitumen felt cover, especially of the CK(sand). The canopy, new branch length and leaf area index also grow in experimental period. But the CK consumes a little water because the neutron probe can t detect the water in gravel layer. The trends and values of transpiration rates determined by LI-1600 stoma meter were different in different date, but the variation paces of both A. ordosica and C. korshinskii were consistent, and the transpiration rate of A. ordosica was higher than that of C. korshinskii. All of diurnal variation curves of transpiration rates simulated by polynomial are significant (P < 0.05). With unit integrating and scale conversion, the transpirations determined by lysimeter and LI-1600 stoma meter are analyzed with Variance Analysis Method. The results show that the difference between species is significant (P < 0.05), but the difference between methods is not significant. It indicates that the scale conversion between leaf level and plant population level based on canopy and leaf area index is successful.

Key words: artificially re-vegetated desert area, transpiration, lysimeter, LI-1600 stoma meter, scale conversion

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