桂花树蒸腾耗水的动态特征及环境因子的响应  

The dynamic characteristics of transpiration and the response of environment factors for Osmanthus fragrans

作　　者：刘娜[1] 蒋武林[2] 

机构地区：[1]湖南师范大学资源与环境科学学院,湖南长沙410006 [2]凤凰县国土资源局,湖南凤凰416200

出　　处：《大众科技》2015年第8期25-28,共4页Popular Science & Technology

摘　　要：文章基于对液流、水势及气象因子的监测,分析桂花树在生长季的蒸腾变化特征及其与环境因子的关系。研究发现(1)生长季蒸腾量的变化波动较大,其最大值在6月底,最小值在6月初。(2)整体上太阳辐射与蒸腾呈正相关,旱季二者的关系不明显。(3)VPD对蒸腾有双重影响。VPD值较小时,二者呈正相关,VPD增加到一定阈值,蒸腾量随VPD的增加而减少。(4)土壤水势与蒸腾呈正相关,旱季水势对蒸腾的影响最明显。We study the dynamic characteristics ofOsmanthus fragranstranspiration in the growing season and analysis the response of environment factors for transpiration rate, both studies are based on the measurement of sap flow, water potential and meteorological factors. The result indicated that （1） Monthly variation of transpiration rate is instable in the growth season; the maximum transpiration rate appeared at the end of June, and the minimum in early June. （2） solar radiation and transpiration are positively correlated on the whole, but in drought season, the relationship between the two is not obvious; （3） VPD has dual effects on plant transpiration, when VPD is smaller than some value, VPD and transpiration is positive correlation, while VPD increased to one value, the transpiration rate is decreased with the increase of VPD; （4） the relationship between soil water potential and transpiration is the positive correlation, the effect of water potential on transpiration rate was most obvious in drought season.

关 键 词：蒸腾 变化特征 环境因子 

分 类 号：Q948[生物学—植物学]