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冰川冻土 ›› 2018, Vol. 40 ›› Issue (1): 166-175.doi: 10.7522/j.issn.1000-0240.2018.0020

• 寒旱区生物学 • 上一篇    下一篇

胡杨树干液流日变化及其与气象因素的相关关系

买尔当·克依木1,2, 玉米提·哈力克1,2, 古丽比亚·乌买尔1,2, 阿不都艾尼·阿不里2,3   

  1. 1. 新疆大学 资源与环境科学学院, 乌鲁木齐 830046;
    2. 新疆维吾尔自治区 绿洲生态重点实验室, 乌鲁木齐 830046;
    3. 新疆大学 干旱生态环境研究所, 乌鲁木齐 830046
  • 收稿日期:2015-01-19 修回日期:2018-01-12 出版日期:2018-02-25 发布日期:2018-04-13
  • 通讯作者: 玉米提·哈力克,E-mail:halik@xju.edu.cn E-mail:halik@xju.edu.cn
  • 作者简介:买尔当·克依木(1987-),男,新疆吐鲁番人,2014年在新疆大学获硕士学位,现为新疆大学在读博士研究生,从事干旱区生态水文过程方面的研究.E-mail:merdan@xju.edu.cn
  • 基金资助:
    国家自然科学基金项目(U1703102;31360200);大众汽车基金会(VolkswagenStiftung)EcoCAR项目(Az.:88497)资助

Diel variation of Populus euphratica sap flow and its correlation with meteorological factors

Maierdang Keyimu1,2, Vmüt Halik1,2, Gulibiya Wumaier1,2, Abdugheni Abliz2,3   

  1. 1. College of Resources and Environmental Science, Xinjiang University, Vrümqi 830046, China;
    2. Key Laboratory of Oasis Ecology, Xinjiang University, Vrümqi 830046, China;
    3. Institute of Arid Ecology and Environment, Xinjiang University, Vrümqi 830046, China
  • Received:2015-01-19 Revised:2018-01-12 Online:2018-02-25 Published:2018-04-13

摘要: 选取塔里木河中游胡杨林自然保护区内不同长势和直径的六棵胡杨(Populus euphratica Oliv.)样木,利用热比率树干液流仪(SFM1)进行树干液流测定,并分析其日变化规律;同步监测各样地的气象因子,建立气象因子与树干液流速率日变化之间的逐步回归方程(Stepwise Regression Equation),分析气象因子对胡杨树干液流的影响。研究结果如下:(1)不同长势和直径的胡杨树干液流速率差异很大,但其整个日变化过程类似,均有明显的昼夜变化规律。旺盛胡杨树干液流日变化特征呈单峰曲线,而衰弱胡杨呈双峰曲线。(2)大直径胡杨树干液流速率和日累计液流量大于小直径胡杨;长势旺盛的胡杨树干液流速率和日累计液流量均大于衰弱胡杨。各胡杨样木日累计液流量的大小排序为:旺盛大直径胡杨 > 旺盛中直径胡杨 > 衰弱大直径胡杨 > 旺盛小直径胡杨 > 衰弱中直径胡杨 > 衰弱小直径胡杨。(3)虽然胡杨各样树在长势和直径结构上有差异,但其树干液流速率日变化与气象因子的关系大致相同,均与太阳辐射、气温、风速和土壤温度呈显著正相关(P<0.05),而与空气湿度呈显著负相关。(4)在诸多气象因子中,气温、太阳辐射和空气湿度是影响树干液流速率的主要因子。

关键词: 胡杨, 长势, 直径(DBH), 树干液流, 气象因子

Abstract: Six sample trees of Populus euphratica Oliv. with different vitality and DBH were chosen from the National Populus euphratica Conservation Park located in the middle reaches of the Tarim River. Stem sap flow of these P. euphratica had been measured using thermal pulse trunk flow meter, and their diel sap flow variation characteristics had been analyzed. Besides, a stepwise regression equation between meteorological factors and the diel variation of sap flow rate had been established in order to illustrate the impact of meteorological factors on diel variation of sap flow rate. The results showed that:(1) Although P. euphratica in each transect are belong to different DBH and vitality group, their sap flow rate are very different, but have similar variation characteristics in the measuring days, all display very obvious day-night shift. Sap flow diel variation process of P. euphratica with good vitality display one peak, while those with bad vitality display two peaks. (2) Sap flow rate and its daily accumulation of P. euphratica with good vitality and older DBH is more than those with younger and bad vitality P. euphratica. Daily sap flow accumulation sequence of the P. euphratica is as follows:old P. euphratica with good vitality > mature P. euphratica with good vitality > old P. euphratica with bad vitality > young P. euphratica with good vitality > mature P. euphratica with bad vitality > young P. euphratica with bad vitality. (3) Though the P. euphratica in each transect are belong to different vitality and DBH group, the effect of meteorological factors on their sap flow rate are almost at the same level. The variation of sap flow rate is positively related to solar radiation, air temperature, wind speed and soil temperature, while, negatively related to air humidity. Among these factors, solar radiation, air temperature and air humidity have the highest effect on diel variation of sap flow rate.

Key words: Populus euphratica, tree vitality, diameter at breast height (DBH), sap flow, meteorological factors

中图分类号: 

  • Q945.17+1