Spatiotemporal Dynamics of Betula pendula Crown Cover on Abandoned Arable Land in a Broad-Leaved Forest Zone of Bashkir Cis-Ural

IF 2.4 2区农林科学 Q1 FORESTRY

Forests Pub Date : 2023-12-22 DOI:10.3390/f15010034

N. Fedorov, I. Tuktamyshev, Ilnur Bikbaev, P. Shirokikh, Svetlana Zhigunova, Elvira Baisheva, V. Martynenko

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引用次数: 0

Abstract

Silver birch (Betula pendula Roth) is one of the fast-growing tree species that often colonize abandoned agricultural lands in Europe and the European part of Russia. The purpose of this article is to analyze the spatiotemporal dynamics of Betula pendula crown cover on abandoned arable lands in a zone of broad-leaved forests of the Bashkir Cis-Ural (Russia, Republic of Bashkortostan). The assessment of current and retrospective values of crown cover was carried out using a regression model of the dependence of crown cover on the values of red channel brightness in early-spring images from Landsat 5–8 and Sentinel-2 satellites from 2012–2022. To estimate the number and height of trees, a survey was carried out using a LiDAR camera mounted on a UAV. After calculating the crown cover in grid squares and their distance from the seed source in QGIS, variance analysis was carried out to assess the influence of the factor of distance from the seed source on the crown cover. The influence of the factor of distance from the seed source on the crown cover was higher at earlier stages of overgrowth of abandoned agricultural lands. An exception to this dependence was only one sample plot where the prevailing wind direction was opposite to the direction of seed dispersal. The leading factors affecting the distribution of birch on abandoned agricultural lands were wind direction, height of seed trees, and grazing. In the parts of the sample plots that were furthest away from seed sources, the trees were 1–3 years younger or the same age, and stand density was lower than in sites located closer to the seed trees. In general, the results of the present study indicate two opposite relationships between seedling survival and distance to seed trees: (1) seed fall and seedling density decrease with increasing distance from the seed tree, and (2) the probability of seed/seedling survival increases due to decreased competition.

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中乌拉尔巴什基尔阔叶林区废弃耕地上桦树树冠覆盖的时空动态变化

银桦（Betula pendula Roth）是快速生长的树种之一，经常在欧洲和俄罗斯欧洲部分的废弃农田上生长。本文旨在分析巴什基尔中乌拉尔（俄罗斯，巴什科尔托斯坦共和国）阔叶林区废弃耕地上银桦树冠覆盖率的时空动态。树冠覆盖率的当前值和追溯值的评估采用了树冠覆盖率与 2012-2022 年陆地卫星 5-8 号和哨兵-2 号卫星早春图像中红色通道亮度值相关性的回归模型。为了估算树木的数量和高度，使用安装在无人机上的激光雷达相机进行了调查。在 QGIS 中计算了网格方格的树冠覆盖率及其与种源的距离后，进行了方差分析，以评估种源距离因素对树冠覆盖率的影响。在废弃农田过度生长的早期阶段，与种源的距离因素对树冠覆盖率的影响较大。只有一个样地例外，其盛行风向与种子传播方向相反。影响桦树在废弃农田上分布的主要因素是风向、种子树的高度和放牧。在离种子产地最远的样地，树龄比靠近种子树的地方小 1-3 年或树龄相同，林分密度也比靠近种子树的地方低。总体而言，本研究的结果表明，幼苗存活率与种子树距离之间存在两种相反的关系：（1）随着与种子树距离的增加，落种率和幼苗密度降低；（2）由于竞争减少，种子/幼苗存活的概率增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Forests FORESTRY-

CiteScore

4.40

自引率

17.20%

发文量

1823

审稿时长

19.02 days

期刊介绍： Forests (ISSN 1999-4907) is an international and cross-disciplinary scholarly journal of forestry and forest ecology. It publishes research papers, short communications and review papers. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.