气候变化领域集成服务门户(CCPortal): Impact of soil water content on the overturning resistance of young Pinus Pinaster in sandy soil

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DOI	10.1016/j.foreco.2020.118614
	Impact of soil water content on the overturning resistance of young Pinus Pinaster in sandy soil
	Défossez P.; Veylon G.; Yang M.; Bonnefond J.M.; Garrigou D.; Trichet P.; Danjon F.
发表日期	2021
ISSN	0378-1127
卷号	480
英文摘要	Background and aims: The tree resistance to uprooting is crucial to face wind damage in temperate forest. Tree anchorage varies considerably with site conditions, species, and tree age. Only few studies have focused on the influence of the site soil properties on the tree anchorage. With ongoing climate change, the soil hydrologic conditions are changing in Europe due to higher precipitations during winter, with possible higher risk of wind damage in forests. Methods: This study investigates the role of soil hydrology on tree anchorage of Pinus pinaster in sandy soil with a combination of field experiments and simulations. Tree pulling experiments until root-soil system failure were performed for 12 Pinus pinaster of 14 years-old growing in podzol to measure the tree resistance to uprooting Mc for two contrasted soil water conditions. In addition, simulations were conducted to analyze how Mc changes during the progressive wetting of the layered soil. For that purpose, a new model was developed for Mc. This model also includes a sub-model for the shear mechanical strengths of the sandy soil layers and their variation with soil water content. The model was calibrated with different data sets: (1) the Mc-data obtained from the tree pulling experiments performed on 14 years-old Pinus pinaster; (2) the 3D root system architectures of the pulled trees; and (3) the soil shear mechanical strength as function of the soil water content measured in laboratory by direct shear tests and soil water retention curve measurements. After calibration, Mc-calculations were performed when simulating a progressive soil wetting by water table increase or by water saturation front progression. Results: Field-data and simulations show that Mc depends little on soil water content outside the domain of complete soil saturation. Close to saturation, simulations show that Mc decreases drastically up to 40 % of its value. This is specific to sandy soil whose mechanical strength is mainly due to the capillarity forces between grains. As illustrated by simulations, the anchorage resistance results from two components. The first friction component slightly increases with soil water content. The second suction component decreases little with soil water content and drops down at saturation when all the interstitial water in the soil porous network merges. Conclusions: This loss of anchorage resistance at full saturation may increase considerably the risk of wind damage of forest growing in sandy soil as floods increase with climate change in Europe. © 2020 Elsevier B.V.
英文关键词	Anchorage; Pinus pinaster; Soil shear strength; Soil water content; Toppling; Windstorm damage
语种	英语
scopus关键词	Anchorages (foundations); Climate change; Forestry; Groundwater; Sand; Soil moisture; Soil testing; Wetting; Anchorage resistance; Direct shear test; Hydrologic conditions; Interstitial water; Soil water content; Soil water retention curves; Temperate forests; Water saturations; Soil surveys; climate change; coniferous tree; sandy soil; soil property; soil water; soil-vegetation interaction; temperate forest; Forestry; Sand; Trees; Wetting; Europe; Pinus pinaster
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/154844
作者单位	INRAE, Bordeaux Sciences Agro, ISPA, Villenave d'Ornon, F-33882, France; INRAE, Aix Marseille Univ., RECOVER, Aix-en-Provence, F-13182, France; INRAE, Univ. Bordeaux, BIOGECO, Cestas, F-33610, France
推荐引用方式 GB/T 7714	Défossez P.,Veylon G.,Yang M.,et al. Impact of soil water content on the overturning resistance of young Pinus Pinaster in sandy soil[J],2021,480.
APA	Défossez P..,Veylon G..,Yang M..,Bonnefond J.M..,Garrigou D..,...&Danjon F..(2021).Impact of soil water content on the overturning resistance of young Pinus Pinaster in sandy soil.Forest Ecology and Management,480.
MLA	Défossez P.,et al."Impact of soil water content on the overturning resistance of young Pinus Pinaster in sandy soil".Forest Ecology and Management 480(2021).