摘要
采用Li-6400光合系统测定仪分别于5月、7月、8月、10月对南林895、I-69、皖林1号3个杨树无性系蒸腾特性进行了测定。结果表明,3个供试杨树无性系蒸腾速率日变化和日均值的年变化均趋势大致相同,5月和10月为单峰型,7月和8月为双峰型,各个杨树无性系蒸腾速率均于7月达到一年中的最高值,5月为最低值。各月蒸腾速率日均值分别为I-69(1.87、7.61、2.52和3.34 mmol.m-2.s-1>南林895(1.71、5.57、1.79和2.71 mmol.m-2.s-1>皖林1号(1.13、3.55、1.4和1.96 mmol.m-2.s-1。相关系数及直接通径系数表明,环境因子对蒸腾速率均具有不同程度的影响,除10月的南林895和I-69为Gs>Ta>RH>PAR外,其余均为Ta>RH>Gs>PAR。3个无性系标准木单株日蒸腾量分别是南林895为42 020.84 g,I-69为61 866.03 g,皖林1号为23 346.43 g。
The characteristics of transpiration of 3 poplar clones which are NL 895,I-69 and WL1 were measured by LI-6400 portable photosynthesis system in May,July,August and October.The result indicated that the daily variation and annual variation of daily average transpiration rates of the 3 tested poplar tree clones were approximately the same,displaying single peak in May and October,and double-peak in July and August.The maximum and minimum values of their transpiration rates appeared in July and May.The monthly order of the daily average transpiration rates in each month were as follows： I-69（1.87,7.61,2.52 and 3.34 mmol·m-2·s-1〉 NL895（1.71,5.57,1.79 and 2.71 mmol·m-2·s-1〉 WL1（1.13,3.55,1.4 and 1.96 mmol·m-2·s-1.Correlation coefficient and direct path coefficient showed that all clones’ transpiration rates had different degree correlation with environmental factors.The factors which affect transpiration rates are of the following order： Ta（air temperature）〉RH（relative humidity）〉Gs（stomatal conductance）〉PAR（photosynthetic active radiation）,in exception to NL895 and I-69 varieties in October,which is in the order of Gs〉Ta〉RH〉PAR.The daily total transpiration quantities for single plant of three clone standard woods were listed as： NL 895,42 020.84g;I-69,61 866.03 g;WL1,23 346.43 g.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2011年第5期713-717,共5页
Journal of Anhui Agricultural University
基金
国家科技支撑计划子课题(2009BAD6B06-1)
沿淮行蓄洪区防洪避灾林关键技术集成与推广(科技部农业科技成果转化资金项目)共同资助
关键词
杨树无性系
蒸腾速率
蒸腾量
环境因子
poplar tree clone
transpiration rate
transpiration quantity
environmental factors
