English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 78728/78728 (100%)
造訪人次 : 33544063      線上人數 : 490
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/54008


    題名: 蓮華池蒸發散季節特性探討與樹液探針之應用;Studies of Seasonal Evapotranspiration Characteristics at Lien-Hua-Chih and Application of the Sap Flow Probe
    作者: 李漢宗;Lee,Han-tsung
    貢獻者: 水文與海洋科學研究所
    關鍵詞: 蒸發散;樹液探針;退耦係數;渦流相關法;Evapotranspiration;sap flow probe;Eddy covariance;decoupling coefficient
    日期: 2012-07-11
    上傳時間: 2012-09-11 18:26:02 (UTC+8)
    出版者: 國立中央大學
    摘要: 蒸發散不僅在水平衡收支裡扮演重要的角色,同時對陸氣交互作用之地表過程也有重大之影響。利用渦流相關系統觀測地表通量,以及所收集的微氣象變數,計算出空氣動力導度、植被導度與退耦係數,並以樹液探針量測樹液流速。本研究目的為:(1)利用退耦係數的概念,了解乾濕季內蒸發散的驅動營力,並探討植被層與大氣間耦合的情形。(2)以樹液探針量測現地的樹液流變動情形,觀察流速變化與環境變數的相關性。研究成果指出,乾濕季平均退耦係數分別為0.20與0.34,平均植被導度分別為0.0047 m/s和0.0075 m/s,平均空氣動力導度皆為0.06 m/s。乾季時的樹液流動較為規律,具有日循環特徵,且淨輻射量與飽和蒸氣壓差對蒸散作用的影響較為顯著。降雨時期的樹液流資料較為散亂,呈現的變化曲線較為不平整。Evapotranspiration (ET) not only plays an important role of water budget, but also significantly affects surface hydrology processes. Surface fluxes were observed with an eddy covariance system in association with environmental factors measurements for computing aerodynamic conductance, canopy conductance and decoupling coefficient. Moreover, sap flow was measured by sap flow probes designed in this study.The purpose of this study included: (1) to investigate seasonal characteristics of evapotranspiration in association with the decoupling coefficients for examining interactions between canopy and atmosphere. (2) to study the correlation between sap flow velocities and environmental variables by sap flow probes designed in this study.For dry and wet seasons, the decoupling coefficients of 0.20 and 0.34, respectively, the canopy conductance were 0.0047 m/s and 0.0075 m/s, respectively; the aerodynamic conductances were equally 0.06 m/s. During dry season, sap flow data shows significant diurnal cycles; radiation and vapor pressure deficit are concluded as major driving factors of tree transpiration. However, the wet season sap flow data presents irregular patterns due to frequent rainfalls.
    顯示於類別:[水文與海洋科學研究所] 博碩士論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML816檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明