tailieunhanh - Báo cáo toán học: "interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: interactions between forest stands and microclimate: Ecophysiological aspects and consequences for silviculture. | 287 Ann. For. Sci. 57 2000 287-301 INRA EDP Sciences Review Interactions between forest stands and microclimate Ecophysiological aspects and consequences for silviculture Gilbert Aussenac Unite d Ecophysiologie Forestière INRA F-54280 Champenoux France Received 9 July 1999 accepted 1 December 1999 Abstract - At a local scale forest trees and stands have a marked influence on climate thus it is possible to define microclimates. These effects depend on local climatic characteristics and stand type. All climatic parameters should be considered but particular attention should be paid to temperature light and water. From a silvicultural point of view knowledge of the interactions existing between microclimatic conditions and stands in conjunction with information now available concerning tree ecophysiology make it possible to produce viable applications which are useful for silviculture during stand formation and for applying silvicultural treatments. Whitout a doubt taking forest cover interactions into account climate and ecophysiological potential of species is the basis of sustainable management in forests. Based on the current knowledge about young stands it is possible to use existing vegetation cover in a more or less modified form to improve temperature conditions especially in relation to spring frost damage and to improve water conditions for both plant uptake and plant growth for a variable period depending on the species but for a minimum of 4 to 5 years. For clearing and thinning the effects of microclimatic changes created by this type of forestry management and consequently the response of trees in terms of photosynthesis and growth are now well defined. forest stands microclimate ecophysiology silviculture Résumé - Interactions entre peuplements forestiers et microclimat aspect écophysiologique et consequences pour la sylviculture. Les arbres et les peuplements forestiers exercent au niveau local des influences notables sur le climat on peut alors .