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Topographically induced variation of microclimatic and soil conditions drives ground vegetation diversity in managed Scots pine stands on inland dunes
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.agrformet.2020.108054
Piotr Sewerniak , Radosław Puchałka

Abstract The goal of this study was to determine the topographically induced pattern of ground vegetation in managed Scots pine (Pinus sylvestris) stands on inland dunes and to link the pattern to the spatial variation of environmental agents (microclimatic and soil conditions). The study was conducted in the Torun Basin (N. Poland), which is located in one of the biggest inland dune fields of the European sand belt. We investigated ground vegetation in 151 plots situated in 3 topographical variants (intra-dune depressions, north- and south-facing dune slopes). Environmental variables were examined in the 3 studied relief positions both with indirect (Ellenberg Indicator Values – EIVs) and direct approaches (measurements of air temperature and humidity as well as soil temperature and moisture). The relationship between the pattern of species composition and environmental controls was investigated using redundancy analysis (RDA). We evaluated the persistence of topographic patterns under the potentially homogenizing influence of forest plantations by sampling pine stands at different stages of growth. Intra-dune depressions were revealed as positions of the highest richness in herbaceous species. This was primarily linked to soil fertility and secondarily to moisture, which were both higher in these positions than on both slope aspects. The affinity of the species richness to low-situated locations was the strongest in mid age classes of pine stands, where stress conditions, resulting mainly from shadowing, were of the highest importance for understory throughout the stand development. However, the results showed that finally in old-growth stands, typical herbaceous species appeared for each of the studied topographical positions. Our study showed that intra-dune depressions could be used in forest management to introduce admixtures of broadleaved species into extensive pine mono-stands. This potentially could increase ecological stability of pine stands growing on inland dunes as well as support forest productivity of such ecosystems.

中文翻译:

地形引起的小气候和土壤条件的变化推动了内陆沙丘上管理的苏格兰松林的地面植被多样性

摘要 本研究的目的是确定内陆沙丘上受管理的苏格兰松 (Pinus sylvestris) 地面植被的地形诱发模式,并将该模式​​与环境因素的空间变化(小气候和土壤条件)联系起来。该研究是在托伦盆地(波兰北部)进行的,该盆地位于欧洲沙带最大的内陆沙丘区之一。我们调查了位于 3 个地形变体(沙丘内洼地、朝北和朝南的沙丘斜坡)的 151 个地块中的地面植被。在 3 个研究的救济位置中,通过间接(Ellenberg 指标值 - EIV)和直接方法(空气温度和湿度以及土壤温度和湿度的测量)检查了环境变量。使用冗余分析 (RDA) 研究了物种组成模式与环境控制之间的关系。我们通过对不同生长阶段的松林进行采样,评估了在人工林潜在均质化影响下地形模式的持久性。沙丘内洼地被揭示为草本物种最丰富的位置。这主要与土壤肥力有关,其次与水分有关,这两个位置的水分都高于坡度。物种丰富度与低地位置的亲和力在中龄松林中最强,其中主要由阴影引起的压力条件对整个林分发展的林下最重要。然而,结果表明,最终在老林中,每个研究的地形位置都出现了典型的草本物种。我们的研究表明,沙丘内洼地可用于森林管理,将阔叶树种的混合物引入大面积的松单林。这可能会增加生长在内陆沙丘上的松林的生态稳定性,并支持此类生态系统的森林生产力。
更新日期:2020-09-01
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