Báo cáo lâm nghiệp:"Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes after eight years in Québec (Canada)" ppsx

... 691–699 © INRA, EDP Sciences, 2004 DOI: 10.1051/forest:2003063 Original article Net effect of competing vegetation on selected environmental conditions and performance of four spruce seedling stock sizes ... species and their interactions on seedling survival and growth, eight years after plantation. 2. MATERIALS AND METHODS The investigations w...

Ngày tải lên: 08/08/2014, 01:21

... ac- cording to characteristic absorbances in pyrophos- phate. Carbon contained in humic acids (hereinafter C-HA) and carbon contained in fulvic acids (herein- after C-FA) were detected. Based on ... se- quence of revitalization measures supported by the point application of fertilizers to forest plantations contributes to stabilization of the cycling of matter. CONCLUSI...

Ngày tải lên: 07/08/2014, 03:22

... of soil organic matter of those 4 elevations (Table 1). e partial in uence of elevation and as- sociated vegetation type and the effect of moisture- elevation interaction on C 0 and C 0 k indicated ... is maintained at 20°C. For the given vegetation type of Changbai Mountain, soil C and N mineralization rate, potential mineralizable C (C 0 ) and potential rate...

Ngày tải lên: 07/08/2014, 10:21

... monitoring of forest conditions after liming is required. ere exist a lot of data on the liming effect on the soil chemistry changes but data on the liming effect on the mineral nutrition of ... stand which was limed in the past years and in a spruce stand which was not limed in order to compare the liming effect on the mineral nutrition of spruce stands....

Ngày tải lên: 07/08/2014, 10:21

... Further inves- tigations are necessary for a better understanding of the underlying physiolog- ical mechanisms. The findings of adverse effects of ample N supply and of spring ... (Durham) 65, 1087-1092 Aronsson A (1980) Frost hardiness in Scots pine (Pinus silvestris L). lI. Hardiness during winter and spring in young trees of different mine...

Ngày tải lên: 08/08/2014, 18:21

... mineral nutrition on carbon dioxide exchange and parti- tioning of carbon in trees. In: Nutrition of Plan- tation Forests. (Bowen G.D. & Nambiar E.K.S., eds.), Academic Press, London, ... density decreased with increasing nitrogen con- tent (Fig. 4) and the needle angle increa- sed with increasing nitrogen content (Fig. 5). In conclusion,...

Ngày tải lên: 09/08/2014, 04:20

... results of an investigation into the long-lastinc l effects of ozone fumiga- tion upon photosynthesis of Norway spruce. Measurements were conducted in the field 6-7 mo after ... Carbon dioxide assimilation and growth of red spruce seedlings in response to ozone and precipitation chemis- try and soil type. Oecologia (Berlin) 70, 163-171 Di...

Ngày tải lên: 09/08/2014, 04:20

... predictions should be based on nonlinear functions [13, 18]. So, in the second step, the two parameters in equation (1) were determined performing a non-linear regression by a modified Gauss- Newton ... are the same of Table IV. SS is the sum of squares for error in arithmetic unit. In this case a and b and the coefficient of determination (R 2 ) were calculated using a no...

Ngày tải lên: 08/08/2014, 00:22

... the level of leaning pines decreases. This relation may be the translation of the interaction between stand effect and tree effect on wind-firmness. In dense plots, the crowns are in close contact and ... Maritime pine stands” contract associating INRA, AFOCEL, CPFA and ONF. Moreover, the Aquitaine region has financed the study “Pine and wind: from the study of stabili...

Ngày tải lên: 08/08/2014, 01:21

... analysis and 37 permanent plots in even-aged stands of stone pine (Pinus pinea L.) in four regions of Spain (Central Range, Northern Plateau, West Andalusia and Catalonia) are used to develop a dominant ... 10.1051/forest:2003017 Original article Inter-regional variability in site index models for even-aged stands of stone pine (Pinus pinea L.) in Spain Rafael Calama a *,...

Ngày tải lên: 08/08/2014, 01:21