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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

期刊文章

Linking climate, annual growth and competition in a Mediterranean forest: Pinus pinea in the Spanish Northern Plateau  [2019]

Calama, Rafael; Conde, Mar; de-Dios-García, Javier; Madrigal, Guillermo; et al.

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Climate, competition and site conditions are the main drivers controlling annual secondary growth in tree species. These factors do no act independently on tree growth, but by means of interactions, resulting in mediated interactive effects. For example, the stress gradient hypothesis postulates alleviated interspecific competition under limiting spatial (site) or temporal (climate) resources. According to this, models predicting annual growth and yield for a given forest should consider these issues in their formulation. In this study, we present a modelling approach based on using data from permanent plots and dendrochronological analysis in order to describe annual tree growth in pure, even-aged stands of Pinus pinea L. in the Spanish Northern Plateau, a highly limiting environment due to its Mediterranean continental climate. Our method is based on identifying the different sources of variability by means of a multilevel linear mixed model, and thereby identifying the potential covariates explaining observed variability at the different spatiotemporal scales. Our results indicate that site related factors such as site index or dominant height exert a greater influence on annual secondary growth than size-symmetric competition. In addition, we found that the controlling influence of water stress is greater than that of temperatures on tree growth. Furthermore, our results allow evidence to be identified for the stress gradient hypothesis in temporal int
raspecific interactions, since trees exposed to a higher degree of competition tend to grow more than expected in dry periods. In contrast, the effect of competition on growth, on average, tends to be aggravated at very poor sites. Finally, our modelling approach allows us to conduct growth and yield simulations under different climate scenarios at different spatial scales, providing results which point to significant decreases in timber and cone production under the more severe scenarios, which can be alleviated through more intensive silviculture.
来自期刊
Agricultural and forest meteorology
ISSN : 0168-1923

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2019
卷:
264
期:
1
范围:
309-321
出版者:
Elsevier B.V.
所有题名:
"Linking climate, annual growth and competition in a Mediterranean forest: Pinus pinea in the Spanish Northern Plateau"@eng
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2019
卷:
264
期:
1
范围:
309-321
出版者:
Elsevier B.V.
所有题名:
"Linking climate, annual growth and competition in a Mediterranean forest: Pinus pinea in the Spanish Northern Plateau"@eng