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首页> 外文期刊>Journal of arid environments >Exposure-related forest-steppe: A diverse landscape type determined by topography and climate
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Exposure-related forest-steppe: A diverse landscape type determined by topography and climate

机译：暴露相关的森林草原：由地形和气候决定的多样化景观类型

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Topographic heterogeneity under dry continental climate can create a landscape mosaic called "exposure-related forest-steppe", characterized by a regular pattern of forest on the north- and steppe on the south-facing slopes. Here we identify the climatic and topographic determinants of this landscape type, using a model of the Altai Mountains in southern Siberia because they (1) contain large areas of forest steppe together with forested and steppe landscapes, and (2) possess well-preserved natural land-cover. Based on the Landsat land-cover classification and digital elevation model we identified areas containing exposure-related forest-steppe and modeled their climatic and topographic thresholds using regression trees. The models showed that in the Altai exposure-related forest-steppe is most common in topographically heterogeneous areas with May September precipitation of 226-377 mm and a mean July temperature of 13.8-15.6 degrees C. Its existence is jointly determined by hilly topography and a climate that is moist enough to support tree growth on north-facing slopes, but insufficiently so to support woodland development on south-facing slopes. This is consistent with the concept of effective topographic heterogeneity, suggesting that topographic heterogeneity on the landscape level is translated into high habitat diversity and species diversity only within a certain range of climatic conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：干旱大陆性气候下的地形异质性可以形成一个称为“与曝光有关的森林草原”的景观马赛克，其特征是北部和南部的草原上有规律的森林格局。在这里，我们使用西伯利亚南部的阿尔泰山脉模型来确定这种景观类型的气候和地形决定因素，因为它们（1）包含大面积的森林草原以及森林和草原景观，并且（2）拥有保存完好的自然土地覆盖。基于Landsat土地覆盖物分类和数字高程模型，我们确定了包含与暴露相关的森林草原的区域，并使用回归树对它们的气候和地形阈值进行了建模。模型显示，在阿尔泰地区，与森林相关的草原草原最常见于地形异质区，9月的5月降水量为226-377 mm，7月的平均温度为13.8-15.6摄氏度。其存在是由丘陵地形和足够湿润的气候足以支持朝北的斜坡上的树木生长，但不足以支持朝南的斜坡上的林地发展。这与有效的地形异质性概念相吻合，表明景观水平的地形异质性仅在一定的气候条件下才转化为高栖息地多样性和物种多样性。 （C）2016 Elsevier Ltd.保留所有权利。

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