气候变化领域集成服务门户(CCPortal): Drought mitigation by thinning: Benefits from the stem to the stand along 15 years of experimental rainfall exclusion in a holm oak coppice

CCPortal

DOI	10.1016/j.foreco.2020.118266
	Drought mitigation by thinning: Benefits from the stem to the stand along 15 years of experimental rainfall exclusion in a holm oak coppice
	Gavinet J.; Ourcival J.-M.; Gauzere J.; García de Jalón L.; Limousin J.-M.
发表日期	2020
ISSN	0378-1127
卷号	473
英文摘要	In northern Mediterranean forests, increasing drought stress due to the on-going climate change is combined with stand ageing due to the lack of management. Management by thinning may alleviate drought stress by reducing competition, but its application is challenging in coppices of resprouting species where its long-term consequences for tree demography and stand dynamics are difficult to evaluate. In this study, we investigate the long-term (15 years) demographic responses of holm oak (Quercus ilex L.) to a combination of thinning from below (−30% basal area) and experimental rainfall exclusion (−27% precipitation). Stem growth, survival and resistance to an extreme drought event were positively linked to both stem size and local competition release after thinning. Thinning improvement of growth and survival were thus due to both a selection of the biggest, most vigorous, trees and to a release of competition for water. Rainfall exclusion, on the other hand, led to a shift of the tree size-mortality relationship, which resulted in the death of bigger trees, in a faster loss of stool density and in a slower evolution of the stand basal area compared to the control. Thinning was beneficial by cancelling the rainfall exclusion effects on growth and mortality, and by doubling the stand basal area increment compared to unthinned control. The initial loss of stools due to thinning was compensated by a lower mortality, suggesting that thinning do not reduce further the amount of unique genotypes on the long-term. Positive thinning effects on stem growth decreased over time but remained significant 15 years after thinning, while resprouting dynamics strongly decreased with time. These results indicate that moderate thinning from below is a relevant strategy to increase stem vitality and stand production in old coppices, particularly in a context of a chronic rise in drought stress and more frequent extreme drought episodes. © 2020 Elsevier B.V.
英文关键词	Adaptive management; Climate change; Drought resistance; Ecosystem manipulation; Quercus ilex; Resprouting; Stem growth; Stool density; Tree mortality
语种	英语
scopus关键词	Climate change; Demography; Drought; Population dynamics; Population statistics; Rain; Competition release; Drought mitigation; ITS applications; Mediterranean forest; Stand basal area; Stand dynamics; Thinning from below; Tree demographies; Forestry; basal area; climate change; coppice; deciduous tree; drought; drought stress; mortality; rainfall; stand dynamics; stem; thinning; Competition; Drought; Forestry; Growth; Mortality; Rain; Stresses; Thinning; Mediterranean Region; 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/155162
作者单位	Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), Univ Montpellier, CNRS, EPHE, IRD, Univ Paul Valéry Montpellier 3, 1919 route de Mende, Montpellier, Cedex 5, F-34293, France; Institute of Evolutionary Biology, School of Biological Sciences, University of EdinburghEH93FL, United Kingdom
推荐引用方式 GB/T 7714	Gavinet J.,Ourcival J.-M.,Gauzere J.,et al. Drought mitigation by thinning: Benefits from the stem to the stand along 15 years of experimental rainfall exclusion in a holm oak coppice[J],2020,473.
APA	Gavinet J.,Ourcival J.-M.,Gauzere J.,García de Jalón L.,&Limousin J.-M..(2020).Drought mitigation by thinning: Benefits from the stem to the stand along 15 years of experimental rainfall exclusion in a holm oak coppice.Forest Ecology and Management,473.
MLA	Gavinet J.,et al."Drought mitigation by thinning: Benefits from the stem to the stand along 15 years of experimental rainfall exclusion in a holm oak coppice".Forest Ecology and Management 473(2020).