Relating leaf area index of natural eucalypt vegetation to climate variables in southern Australia
Relating leaf area index of natural eucalypt vegetation to climate variables in southern Australia
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DOI：
10.1016/j.agwat.2008.02.007
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发表时间：
2008-06-01
影响因子：
6.7
通讯作者：
Hatton, T. J.
中科院分区：
文献类型：
--
作者：
Ellis, T. W.;Hatton, T. J.
我们需要一个快速的技术来估计叶面积指数（LAI）的预先存在的自然植被。这需要确定农林种植对农田深层排水的影响。以往的工作表明：（1）林带的水文“足迹”与其线性叶面积（每米林带的叶面积，LLA，m（2）m（-1））之间的关系，相对于自然植被的叶面积指数;（2）自然植被的叶面积指数与植物可利用的土壤水分和气候有关。我们评估了在澳大利亚南部37个地点测得的LAI与以下因素之间的关系：（1）年平均降雨量，P;（2）年平均蒸发皿蒸发量，EO;（3）“有效总量”-年平均降雨量，P，减去年平均蒸发皿蒸发量，EO;（4）气候湿度指数P/E-0;（5）Specht土壤蒸发指数，k = 0.0045 + 71.57/E-0。P值为所用数据集的最佳指标，即LAI = 0.003P + 0.41（r（2）= 0.80）。皇冠版权所有（c）2008年出版的爱思唯尔B. V.保留所有权利。
We address a need for a rapid technique to estimate the leaf area index (LAI) of pre-existing natural vegetation. This is required to determine the effects of agroforestry plantings on deep drainage from agricultural land. Previous work shows: (1) a relationship between the hydrologic 'footprint' of tree belts and their lineal leaf area (leaf area per metre of belt, LLA, m(2) m(-1)), relative to the LAI of natural vegetation and (2) that the LAI of natural vegetation is related to plant-available soil moisture and climate. We evaluated relationships between LAI measured at 37 sites across southern Australia and (1) annual average rainfall, P; (2) annual average pan evaporation, EO; (3)'available rainfall'-annual average rainfall, P, minus annual average pan evaporation, EO; (4) a climate wetness index P/E-0; (5) Specht's soil evaporative index, k = 0.0045 + 71.57/E-0. P was the best indicator for the data set used, i.e. LAI = 0.003P + 0.41 (r(2) = 0.80). Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.