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应用生态学报 ›› 2017, Vol. 28 ›› Issue (7): 2111-2118.doi: 10.13287/j.1001-9332.201707.037

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基于稳定同位素和热扩散技术的张北杨树水分关系差异

苗博1,2, 孟平1,2, 张劲松1,2, 何方杰1,2, 孙守家1,2*   

  1. 1中国林业科学研究院林业研究所/国家林业局林木培育重点实验室, 北京 100091
    2南京林业大学南方现代林业协同创新中心, 南京 210037
  • 收稿日期:2017-02-27 修回日期:2017-05-29 发布日期:2017-07-18
  • 通讯作者: *mail:ssj1101@163.com
  • 作者简介:苗博,男,1988年生,硕士研究生.主要从事森林生态学研究.E-mail:miaobo2152@163.com
  • 基金资助:
    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

Difference of water relationships of poplar trees in Zhangbei County, Hebei, China based on stable isotope and thermal dissipation method

MIAO Bo1,2, MENG Ping1,2, ZHANG Jin-song1,2, HE Fang-jie1,2, SUN Shou-jia1,2*   

  1. 1Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
    2Co-Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
  • Received:2017-02-27 Revised:2017-05-29 Published:2017-07-18
  • Contact: *mail:ssj1101@163.com
  • Supported by:
    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.

摘要: 利用稳定氢同位素和热扩散技术研究张北防护林杨树的水分来源和蒸腾耗水,分析确定未退化与退化杨树的水分关系差异.结果表明:在生长季节中退化杨树主要利用0~30 cm土壤水分,未退化杨树主要利用30~80 cm土壤水分,两者的水分来源不同.旱季时,未退化杨树利用深层土壤水分和地下水的比例明显高于退化杨树.雨季中,杨树对0~30 cm土壤水分的利用比例增加,退化杨树增加幅度明显高于未退化杨树,对30~180 cm土壤水分的利用比例均减少.未退化杨树的液流速率大于退化杨树,不同天气中液流速率表现出相似的变化趋势,但未退化杨树液流的启动时间比退化杨树早.相关分析表明,未退化和退化杨树液流速率与土壤温度、风速、太阳辐射、相对湿度、空气温度均呈极显著的相关关系.退化杨树液流速率与土壤温度和空气相对湿度呈极显著负相关,与其他因素呈显著正相关,而未退化杨树仅与空气相对湿度呈极显著负相关,与其他因素均呈显著正相关关系,表明退化和未退化杨树蒸腾耗水易受环境条件的影响.退化杨树液流日累计量明显小于未退化杨树,表明其蒸腾耗水量较少;退化杨树水分来源浅,蒸腾耗水的减少并不能阻止林分退化.

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 0-30 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.