植物生态学报 ›› 2010, Vol. 34 ›› Issue (4): 469-476.DOI: 10.3773/j.issn.1005-264x.2010.04.013

• 简报 • 上一篇    

黄土高原半干旱区刺槐生长盛期树干液流动态

吴芳1,*(), 陈云明1,2,**(), 于占辉3   

  1. 1西北农林科技大学资源环境学院, 陕西杨凌 712100
    2中国科学院水土保持研究所, 陕西杨凌 712100
    3东北电力设计院, 长春 130000
  • 收稿日期:2009-04-20 接受日期:2009-10-30 出版日期:2010-04-20 发布日期:2010-04-01
  • 通讯作者: 陈云明
  • 作者简介:** E-mail: ymchen@ms.iswc.ac.cn
    * E-mail: wufang_10@163.com

Growing season sap-flow dynamics of Robinia pseudoacacia plantation in the semi-arid region of Loess Plateau, China

WU Fang1,*(), CHEN Yun-Ming1,2,**(), YU Zhan-Hui3   

  1. 1College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
    2Institute of Soil and Water Conservation of Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
    3Northeast Electric Power Design Institute, Changchun, 130000, China
  • Received:2009-04-20 Accepted:2009-10-30 Online:2010-04-20 Published:2010-04-01
  • Contact: CHEN Yun-Ming

摘要:

通过研究树干液流速率与气象因子的关系, 可以定量地分析树木生长与群落蒸腾耗水的相互关系, 揭示黄土高原半干旱区刺槐水分利用动态及其适应环境因子的内在机理, 为当地生态环境建设提供理论依据。应用热扩散式树干茎流计(TDP)于2008年7月1日至7月26日, 在黄土高原半干旱区安塞县对刺槐(Robinia pseudoacacia)人工林生长盛期树干液流速率进行了连续测定, 并对周围气象、土壤水分等指标进行了同步测定。刺槐生长盛期树干液流速率晴天日变化呈宽峰形曲线, 在测量时期液流速率日平均值为0.001 33 cm·s-1; 刺槐树干单位边材面积的液流速率与光合有效辐射、大气温度、水汽压差呈极显著正相关关系, 与相对湿度呈负相关关系。其相关程度绝对值顺序为光合有效辐射>大气温度>水汽压差>相对湿度>风速; 刺槐边材面积与胸径之间存在着显著的线性相关关系, 相关系数为0.878, 单位边材面积的液流速率随树干胸径的增大而减小。

关键词: 气象因子, 黄土高原, 刺槐, 树干液流, 热扩散式探针

Abstract:

Aim We studied the relationship between sap-flow velocity and meteorological factors to quantitatively correlate tree growth and transpirational water-consumption, determine the dynamic change of water use of Robinia pseudoacacia in a semi-arid region, reveal its mechanism to adapt to environmental factors and provide the theoretical basis for local ecological reconstruction of the environment.

Methods A thermal dissipation probe (TDP) was used to measure the sap-flow dynamics of R. pseudoacacia in Ansai County in the semi-arid region of the Loess Plateau of China during July 1-26, 2008. Soil water content, photosynthetic active radiation (PAR), air temperature, relative humidity, water vapor pressure deficit (VPD) and wind speed were measured at the same time.

Important findings Diurnal variation of sap flow displayed a broadly peaked curve during the season of rapid growth. The average value was 0.001 33 cm·s-1. Sap-flow velocity per unit sapwood area was significantly correlated with PAR, air temperature and VPD and was negatively correlated with atmospheric relative humidity. The ranking of correlation coefficients was PAR > air temperature > VPD > relative humidity > wind speed. Sapwood area and diameter at breast height (DBH) were significantly correlated (r = 0.878), and sap-flow velocity per unit sapwood area decreased with increased stem diameter.

Key words: climatic factors, Loess Plateau, Robinia pseudoacacia, sap flow, thermal dissipation probe