应用生态学报2017，Vol.28Issue(7)：2111-2118,8.DOI:10.13287/j.1001-9332.201707.037
基于稳定同位素和热扩散技术的张北杨树水分关系差异
Difference of water relationships of poplar trees in Zhangbei County, Hebei, China based on stable isotope and thermal dissipation method
摘要
Abstract
The water sources and transpiration of poplar trees in Zhangbei County were measured using stable hydrogen isotope and thermal dissipation method.The differences in water relationships between dieback and non-dieback poplar trees were analyzed.The results showed that the dieback trees mainly used shallow water from 0-30 cm soil layer during growing season while the non-dieback trees mainly used water from 30-80 cm soil layer.There was a significant difference in water source between them.The non-dieback trees used more water from middle and deep soil layers than that of the dieback trees during the dry season.The percentage of poplar trees using water from 030 cm soil layer increased in wet season,and the increase of dieback trees was higher than that of non-dieback trees.The contributions of water from 30-180 cm soil layer of dieback and non-dieback trees both decreased in wet season.The sap flow rate of non-dieback trees was higher than that of dieback trees.There was a similar variation tend of sap flow rate between dieback and non-dieback trees in different weather conditions,but the start time of sap flow of non-dieback trees was earlier than that of dieback trees.Correlation analysis showed that the sap flow rate of either dieback or non-dieback poplar trees strongly related to soil temperature,wind speed,photosynthetically active radiation,relative humidity and air temperature.The sap flow rate of die-back poplar trees strongly negatively related to soil temperature and relative humidity,and strongly positively related to the other factors.The sap flow rate of non-dieback poplar trees only strongly negatively related to relative humidity but positively related to the other factors.The results revealed transpiration of both poplar trees was easily affected by environmental factors.The water consumption of dieback trees was less than non-dieback trees because the cumulative sap flow amount of dieback trees was lower.Reduced transpiration of dieback trees couldn't help to prevent poplar forest declining due to shallow water source.关键词
杨树/稳定氢同位素/水分来源/液流/林分退化Key words
Populus simonii/stable hydrogen isotope/water source/sap flow/tree dieback引用本文复制引用
苗博,孟平,张劲松,何方杰,孙守家..基于稳定同位素和热扩散技术的张北杨树水分关系差异[J].应用生态学报,2017,28(7):2111-2118,8.基金项目
本文由林业公益性行业科研专项经费(201404206)和南京林业大学南方现代林业协同创新中心项目资助 This work was supported by the Special Fund for Forest Scientific Research in the Public Welfare (201404206) and the Project of Co-Innovation Center for Sustainable Forestry in Southern China of Nanjing Forestry University. （201404206）
