期刊文献+

松嫩平原苏打盐渍土区不同潜水埋深下羊草的光合特征 被引量:3

Characteristics of leaf photosynthesis in Leymus chinensis grown in the salinesodic soil area of the Songnen Plain,at different groundwater depths
下载PDF
导出
摘要 通过人工控制地下水位模拟试验,研究了不同潜水埋深下羊草净光合速率和蒸腾速率。结果表明地下潜水埋深直接影响羊草的正常生理活动。潜水埋深在1.0—2.5m之间,潜水埋深越浅,羊草表现为净光合速率和蒸腾速率越高;随着潜水埋深的增加,羊草净光合速率和蒸腾速率减小,生理活动下降。不同月份羊草净光合速率和蒸腾速率与潜水埋深呈幂函数关系,不同时间羊草净光合速率和蒸腾速率与潜水埋深呈幂函数、指数函数和对数函数关系,相关系数均在0.90以上,因此可以用函数方程来估算不同潜水埋深下的羊草净光合速率和蒸腾速率。结果为松嫩平原苏打盐渍土区植被恢复与环境保护提供科学依据。 In this study, photosynthesis and transpiration rates of Leymus chinensis were studied under controlled groundwater depths,using lysimeters. The lysimeter was 120 cm in length,120 cm in width,and 300 cm in height. A shallow-water lysimeter was used to maintain water table depths of 1. 0,1. 4,1. 8,2. 2,and 2. 5 m in five independent soil columns. The experiment was conducted at the Da'an Sodic Land Ecological Experiment Station of the Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences. The soil type at the study site is classified as salt meadow soil.The experiment was conducted from June to September,in 2011 and 2012. The results indicate that variations in the net leaf photosynthesis and transpiration rates of Leymus chinensis showed a seasonal trend with a peak occurring in July or August. The diurnal change in the net photosynthetic and transpiration rates of Leymus chinensis was a typical bimodal curve with a depression that was observed at midday. Results also showed that groundwater depth has a strong impact on plant eco-physiological characteristics. When the groundwater depth ranged from 1. 0 to 2. 5 m,the net photosynthesis and transpiration rates of Leymus chinensis are highest when groundwater depth is 1. 0 m,with a mean value of 22. 6 μmol m- 2s- 2and 7. 2 mmol H2 O m- 2s- 1,respectively. Both net photosynthesis and transpiration rates of Leymus chinensis decreased as the groundwater depth increased. Leaf photosynthesis and transpiration rates of Leymus chinensis were correlated with groundwater depth during the growing season months: June,July,August,and September. Logarithmic or exponential correlations existed between the leaf photosynthesis and transpiration rates of Leymus chinensis and groundwater burieddepth,at the following times: 6:00 a. m.,8:00 a. m.,10:00 a. m.,12:00 a. m.,14:00 p. m.,16:00 p. m.,and 18:00 p. m. Determination coefficients( R2) for these correlation functions were 0. 9. These exponential or logarithmic correlations can be us
出处 《生态学报》 CAS CSCD 北大核心 2016年第6期1591-1598,共8页 Acta Ecologica Sinica
基金 中国科学院西部行动计划重大项目(KZCX3-XB3-16) 国家重点基础研究发展计划(2015CB150802) 国家自然科学基金项目(41071022)
关键词 羊草 净光合速率 蒸腾速率 潜水埋深 盐碱土 Leymus chinensis photosynthesis rate transpiration rate groundwater buried depth saline-sodic soil
  • 相关文献

参考文献18

二级参考文献109

共引文献338

同被引文献55

引证文献3

二级引证文献16

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部