Báo cáo lâm nghiệp: "Predicting stand damage and tree survival in burned forests in Catalonia (North-East Spain)" pot

... available in planning. The mod- els should be able to predict the potential damage caused by fire in any forest stand in Catalonia, depending on the site and the structure of the stand. In addition ... the stand level was the proportion of trees that died as a result of fire (Tab. I). 2.4. Stand- level damage modelling A stand- level fire damage model was developed by tes...

Ngày tải lên: 07/08/2014, 16:21

... rate, and leaf conductance to water vapor, were performed in situ in attached, fully expanded leaves of control plants and resprouts of burned and tree- felled stands using ... shown in table I. Measurements LA was determined after photocopying 25-35 leaves from each stand using the Interactive Binary System (IBAS). DW was determined after...

Ngày tải lên: 08/08/2014, 18:21

... (Tab. I). Sites in ESSF and SBPS were the least infected, averaging 0.02 and 0.33 galls per tree respectively and those in MS and IDF zones intermediate, 0.53 and 0.78 galls per tree, respectively. ... variation and jack pine introgression on disease and insect resistance in lodgepole pine, Can. J. For. Res. 26 (1996) 711–726. [40] Wu H.X, Ying C.C., Genetic parameters...

Ngày tải lên: 08/08/2014, 00:21

... Rhein und seine Auen – eine Bilanz. Berlin, Springer Verlag. WELANDER N.T., OTTOSSON B., 1998. e in uence of shading on growth and morphology in seedlings of Quercus robur L. and Fagus sylvatica ... increases. MATERIAL AND METHODS Seeds Seeds were collected in a single-layered mature Quercus robur stand in southern Rhineland-Palati- nate (Bellheim Forest District, Germany)...

Ngày tải lên: 07/08/2014, 03:22

... affecting stand growth in unthinned stands while the thinning response function predicts the relative growth response following thinning. Several attempts have been made to model the thinning response ... area removed in thinning opera- tions were available. Summary statistics, including the mean, mini- mum, maximum, and standard deviation of these stand variables are given in Tabl...

Ngày tải lên: 07/08/2014, 16:21

... this include, xeric Q marilandica and Q stellata forests derived from former oak savannas in Oklahoma, Q marilandica - Q velutina in xeric, upland glades in Illinois, and mixed-oak ... oak-hickory and oak-pine forests. Widespread logging and increased fire asso- ciated with land clearing, the charcoal iron industry, tanbark and chemical wood...

Ngày tải lên: 08/08/2014, 18:21

... xylem vessels and darkening of the surronding parenchima (Vannini, 1990b; Vannini and Valentini, 1994). Oak species differ in their susceptibility to the decline syndrome: in France, ... determined by Student’s t-test, using Systat software. RESULTS Decline syndrome began in central Italy in the years 1983-1984. In southern Italy, and particularly...

Ngày tải lên: 08/08/2014, 18:21

... and chloride are sequestered in cells and generate osmotic potential. O. asiaticus var. auran- tiacus maintained an almost constant osmotic potential, but increased the poten- tial ... stem, main root and fine roots. Sodium and potassium were estimated by flame photometry. Chloride was determined by silver ion titration. Results Time course chang...

Ngày tải lên: 09/08/2014, 04:20

... diffusional and mesophyll photosynthetic processes in response to increasing Aw: Pinus pinea seedlings, having a leaf diffusional struc- (Cowan and Farquhar, 1977). In A. nord- manniana ... (Guehl and Aussenac, 1987) and to examine the gas-exchange regu- lation with respect to the optimization theory of Cowan and Farquhar (1977). Results and...

Ngày tải lên: 09/08/2014, 04:20

... Fowler, 1981) and accelerates winter desiccation and needle shedding (Lewitt, 1980; Huttunen and Laine, 1983). Structural degradation of epistomatal wax tubes causes increased stomatal ... stomatal occlu- sion and potentially inhibits stomatal trans- piration, which of course has far reaching physiological consequences on trees (Sauter and Voss, 198...

Ngày tải lên: 09/08/2014, 04:20