基于标准枝浸水法测定的不同杨树无性系蒸腾耗水特性

Characteristics of the Water Consumption for Transpiration of Different Poplar Clones by Soaking Method of Standard Branch

以山东省高密市林业局苗圃内进行区域适宜性试验的8个杨树无性系为研究对象,对不同杨树无性系蒸腾耗水特性进行了研究,结果表明:8个杨树无性系叶片蒸腾耗水速率日动态变化均呈单峰曲线;8个杨树无性系的叶片蒸腾耗水速率与环境因子相关程度依次是光照>空气相对湿度>空气温度>土壤含水量;8个杨树无性系白天单株日蒸腾耗水量大小次序为L35>I-107>NL895>中林46>I-109>L323>中绥12>NL95;依据单株蒸腾耗水量和单株材积对8个杨树无性系进行聚类分析,可分为5类,A类L35属于高材积量、高耗水型;B类L323、NL95和I-109属于中等材积量、较低耗水型;C类NL895为较低材积量、低耗水型;D类I-107为较高材积量、较高耗水型;E类中林46、中绥12为低材积量、中等耗水型。

The transpiration characteristic and its samples selected from 8 varieties of poplar clones were studied based on the observation induced in Gaomi city east of Shandong province. The results show that the rate of water consumption by transpiration daily changing tendency of 8 poplar clones is gnenerally unanimous with single apex curve. The order of the size of the rate of water consumption by transpiration and environmental factors associated analysis is： illumination〉air relative humidity〉 temperature〉 soil moisture content. The water consumption of transpiration is of the following order,L35〉I-107〉NL895 〉Zhonglin46〉I-109〉 L323 〉Zhongsui12〉NL95. All of 8 poplar clones can be categorized into five groups according to water consumption of transpiration and volume increment, L35 belongs to the highest water consumption of transpiration and volume increment; L323, NL95 and 1-109 belong to medium volume increment and lower water consumption of transpiration; NL895 belongs to lower volume increment and the lowest water consumption of transpiration; 1-107 belongs to higher volume increment and water consumption of transpiration; Zhonglin46 and Zhongsui12 belong to the lowest volume increment and medium water consumption of transpiration.