气候变化领域集成服务门户(CCPortal): Effects of species and environmental factors on browsing frequency of young trees in mountain forests affected by natural disturbances

CCPortal

DOI	10.1016/j.foreco.2020.118364
	Effects of species and environmental factors on browsing frequency of young trees in mountain forests affected by natural disturbances
	Szwagrzyk J.; Gazda A.; Muter E.; Pielech R.; Szewczyk J.; Zięba A.; Zwijacz-Kozica T.; Wiertelorz A.; Pachowicz T.; Bodziarczyk J.
发表日期	2020
ISSN	0378-1127
卷号	474
英文摘要	We analyzed the effects of natural disturbances on relationships between forest regeneration and ungulate browsing. Specifically, we asked if natural disturbances affect preferences of ungulate herbivores towards tree species and size classes; and how local and landscape-scale environmental factors affect spatial patterns of ungulate browsing in disturbed forest ecosystems. Our research was conducted in the Tatra National Park, a mountain range affected by large-scale intense disturbances over the last few decades. We used field data collected in a network of regularly distributed 600 circular sample plots where young trees were recorded and examined for browsing signs. Using forage ratio, the Ivlev's electivity index and chi square tests, we found that the preferences of wild ungulates were similar to those known from undisturbed forests. Our analyses showed preference for deciduous species, especially rowan, sycamore maple and goat willow. The most common species, Norway spruce was strongly avoided by browsing ungulates. Short saplings from 0.5 m to 1.3 m tall were the most browsed size class. Effects of environmental variables on browsing were analyzed with zero-inflated negative binomial models. The occurrence of browsing was positively related to the total number of young trees and mature tree mortality. This suggests the influence of disturbances on spatial patterns of browsing pressure. The browsing frequency (number of browsed individuals per plot) was affected by mature tree mortality and densities of young palatable trees, including silver fir, sycamore maple and rowan. Elevation, geology, soil type, and potential solar radiation did not show any significant influence on the browsing frequency. Browsing frequency was also positively related to the distance to roads and hiking trails, indicating the role of human pressure upon the behaviour of ungulate herbivores. In addition, we analyzed the effects of accumulation of coarse woody debris (CWD) on browsing frequency and found this relationship to be nonlinear. Analysis for all tree species revealed that at low levels of CWD, the browsing frequency increased with CWD accumulation as a consequence of forest regeneration. However, a large amount of CWD (>25 m3) resulted in a decrease in browsing frequency, and this relationship was species-specific. © 2020 Elsevier B.V.
关键词	Animals Ecosystems Statistical tests Browsing pressures Coarse woody debris Environmental factors Environmental variables Forest regeneration Natural disturbance Negative binomial models Undisturbed forests Reforestation browsing coarse woody debris coniferous forest coniferous tree disturbance environmental factor forest ecosystem montane forest mountain region ungulate Acer Pseudoplatanus Animals Ecosystems Frequency Patterns Reforestation Statistical Analysis Trees Norway Tatras National Park Abies Acer pseudoplatanus Picea abies Salix caprea Ungulata
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132648
推荐引用方式 GB/T 7714	Szwagrzyk J.,Gazda A.,Muter E.,et al. Effects of species and environmental factors on browsing frequency of young trees in mountain forests affected by natural disturbances[J]. Forest Ecology and Management,2020,474.
APA	Szwagrzyk J..,Gazda A..,Muter E..,Pielech R..,Szewczyk J..,...&Bodziarczyk J..(2020).Effects of species and environmental factors on browsing frequency of young trees in mountain forests affected by natural disturbances.,474.
MLA	Szwagrzyk J.,et al."Effects of species and environmental factors on browsing frequency of young trees in mountain forests affected by natural disturbances".474(2020).