气候变化领域集成服务门户(CCPortal): Forest ecological heterogeneity determines contrasting relationships between crown defoliation and tree diversity

CCPortal

DOI	10.1016/j.foreco.2019.06.017
	Forest ecological heterogeneity determines contrasting relationships between crown defoliation and tree diversity
	Iacopetti G.; Bussotti F.; Selvi F.; Maggino F.; Pollastrini M.
发表日期	2019
ISSN	0378-1127
起始页码	321
结束页码	329
卷号	448
英文摘要	Tree diversity is found to enhance ecosystem functions in forests and increase the resistance and resilience of trees subjected to environmental stress, including climate change. This effect, however, can be different depending on tree species assemblages and ecological contexts. The pan-European programme for monitoring forest health (ICP Forests) considers crown defoliation as an indicator of tree vitality. Only a few studies have analysed the role of tree diversity in crown defoliation, with contrasting results. This paper analyses the relationships between defoliation and forest diversity in a country (Italy) characterised by heterogeneous bioclimatic and edaphic characteristics (from Mediterranean to Alpine) and with a wide range of forest tree species and functional groups. National-scale results show that defoliation increased in more diverse forest stands. This result can be explained by the fact that the tree mixtures reflect varying ecological conditions in heterogeneous environments. The most relevant factors that explain tree defoliation at the national level, investigated through random forest analysis, were the geographic position, tree species identity and forest stand age and structure. Cluster analysis was applied to identify homogeneous groups of plots based on their ecological and vegetation features. Four clusters were selected. Within each homogeneous cluster, the crown defoliation of the tree species showed different and contrasting patterns, changing their relationships with diversity over time. A beneficial role of diversity on defoliation (i.e. decrease of defoliation) has been observed in Quercus ilex, growing in Mediterranean conditions, and Picea abies in Alpine areas after dry periods. In the latter species, drought led to a greater increase in defoliation in monospecific than in mixed stands, suggesting the stabilising role of tree diversity. © 2019 Elsevier B.V.
英文关键词	Cluster analysis; Defoliation; Fagus sylvatica; ICP Forests; Level I survey; Picea abies; Quercus ilex; Random forest analysis; Resilience; Tree diversity
语种	英语
scopus关键词	Climate change; Cluster analysis; Decision trees; Drought; Ecology; Plants (botany); Defoliation; Fagus sylvatica; ICP Forests; Picea abies; Quercus ilex; Random forests; Resilience; Tree diversity; Forestry; bioclimatology; cluster analysis; coniferous tree; deciduous tree; defoliation; drought; ecosystem resilience; environmental conditions; forest ecosystem; forest health; heterogeneity; species diversity; stand structure; survey method; tree; Defoliation; Drought; Ecology; Fagus Sylvatica; Picea Abies; Quercus Ilex; Italy; Fagus sylvatica; Picea abies; Quercus ilex
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155873
作者单位	Department of Agri-Food, Environmental and Forest Sciences and Technologies (DAGRI), University of Firenze, Italy; Department of Statistical Sciences, University La Sapienza, Roma, Italy
推荐引用方式 GB/T 7714	Iacopetti G.,Bussotti F.,Selvi F.,et al. Forest ecological heterogeneity determines contrasting relationships between crown defoliation and tree diversity[J],2019,448.
APA	Iacopetti G.,Bussotti F.,Selvi F.,Maggino F.,&Pollastrini M..(2019).Forest ecological heterogeneity determines contrasting relationships between crown defoliation and tree diversity.Forest Ecology and Management,448.
MLA	Iacopetti G.,et al."Forest ecological heterogeneity determines contrasting relationships between crown defoliation and tree diversity".Forest Ecology and Management 448(2019).