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首页> 外文期刊>Agricultural and Forest Meteorology >Temporal variation in microclimatic edge effects near powerlines, highways and streams in Australian tropical rainforest
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Temporal variation in microclimatic edge effects near powerlines, highways and streams in Australian tropical rainforest

机译：澳大利亚热带雨林中电力线，高速公路和河流附近的小气候边缘效应的时间变化

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摘要

We investigated diurnal variation in edge gradients of air temperature, vapour pressure deficit (VPD) and wind speed in tropical rainforest in northeastern Australia, adjacent to three types of linear canopy openings: a powerline, a highway and a perennial stream. Edge gradients were compared between the wet and dry seasons. Diurnal ranges of air temperature and VPD were elevated near powerline, highway and stream edges and were greater in the dry season than the wet season although this seasonal difference in temperature ranges was less pronounced near powerline than highway or stream edges. Maximum wind speeds were elevated near all three forest edge types, this increase being most pronounced at stream edges. In contrast, although daytime temperature and VPD were also elevated near all three forest edges, stronger effects were experienced at powerlines and highways compared with streams. Wind speed was greater near forest edges than in the forest interior during the daytime, but this effect varied between seasons and among edge types. Edge gradients in wind speed were present near powerline edges in both wet and dry seasons, but only occurred near highway edges during the dry season and near stream edges during the wet season. Nocturnal microclimatic edge gradients were seldom detected. They were observed only for air temperature near powerlines during the dry season, air temperature being reduced at the forest edge compared with the forest interior. These data indicate that linear clearings for roads and powerlines are associated with microclimatic edge gradients qualitatively similar to those observed in other studies at forest edges adjacent to larger clearings. Such gradients have the potential to substantially increase the edge exposure of forest areas internally fragmented by clearings for human infrastructure. Crown Copyright (c) 2008 Published by Elsevier B.V. All rights reserved.
机译：我们调查了澳大利亚东北部热带雨林中与三种线性冠层开口相邻的电力温度，蒸气压亏缺（VPD）和风速的边缘梯度的日变化，其中三种类型的线性冠层开口分别为：电力线，高速公路和多年生河流。比较了雨季和旱季的边缘梯度。在电力线，高速公路和河流边缘附近，气温和VPD的昼夜范围升高，在干旱季节比雨季要大，尽管在电力线附近这种温度范围的季节性差异不如高速公路或河流边缘明显。在所有三种森林边缘类型附近，最大风速都升高了，这种增加在溪流边缘最为明显。相反，尽管在所有三个森林边缘附近，白天的温度和VPD也都升高了，但与溪流相比，电力线和高速公路的影响更大。在白天，森林边缘附近的风速大于森林内部的风速，但是这种影响随季节和边缘类型而变化。风速边缘梯度在雨季和旱季都出现在电力线边缘附近，但仅在旱季期间出现在高速公路边缘附近，而在雨季期间出现在溪流边缘附近。很少检测到夜间微气候边缘梯度。仅在干旱季节观察到电力线附近的空气温度，与森林内部相比，森林边缘的空气温度降低。这些数据表明，道路和电力线的线性清理与小气候边缘梯度在质量上相似，类似于在其他研究中与较大清理相邻的森林边缘上观察到的微气候边缘梯度。这种梯度有可能大大增加因人类基础设施的清理而内部破碎的森林区域的边缘暴露。官方版权（c）2008，由Elsevier B.V.保留所有权利。

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