Báo cáo lâm nghiệp:"High-grading effects on Scots pine volume and basal area in pure stands in northern Spain" pot

... 11–18 © INRA, EDP Sciences, 2003 DOI: 10.1051/forest: 2002069 Original article High-grading effects on Scots pine volume and basal area in pure stands in northern Spain Felipe Bravo a * and Gregorio ... Total and standing volume in a medium productivity (site index 20 m at 100 years), high-graded and non high-graded Scots pine stands in northern S...

Ngày tải lên: 08/08/2014, 01:21

... in relation to the whole plant CO 2 exchange and ii) the relationships between alterations in carbon allocation and in osmoregulation were investigated. MATERIALS AND METHODS Plant ... concentrations. However, elevated CO 2 concentrations often lead to reduced total mineral ion concentrations in the plant tissues (Conroy, 1992; Overdieck, 1993)....

Ngày tải lên: 08/08/2014, 18:21

... in Scotland, radiation is a major limiting factor for carbon assimilation in Scots pine. 5. CONCLUSIONS Whereas temporal variation in needle d 13 C depends on the environmental changes during ... 71–78. [20] Livingston N.J., Spittlehouse D.L., Carbon isotope fractionation in tree ring early and late wood in relation to intra-growing season water balance, Plant Cell Environ....

Ngày tải lên: 08/08/2014, 01:21

... alni subsp. alni in the flooding and non-flooding condition was Table 1. e effect of long-term flooding and Phytophthora alni infection on the development of black alder saplings Treatment per ... height (covariate), flooding, P. alni and flooding × P. alni interaction on depend- ing variables (increase in stem length, length of leaves and biomass of leaves, roots and actin...

Ngày tải lên: 07/08/2014, 10:21

... in uence of cutting intensity on the abundance of both one-year-old and older seedlings. e abundance of beech seedlings was initially increasing with increasing cutting intensity, and, having ... seedlings and the number of fructifying trees, stand density, illumination in the growing season – GS (illumination account by S 1992), leaf area index (LAI), annual throughfall...

Ngày tải lên: 07/08/2014, 10:22

... carbon isotope composition. 1. INTRODUCTION Application of fertiliser often increases the growth of Pinus pinaster Ait. and other conifers [24, 38]. The mass and area of foliage increases following ... against any lasting role of A max in the growth response. Concentrations of N, P, and K were maintained within a relatively small range, and there was no correlation between A max...

Ngày tải lên: 08/08/2014, 00:21

... under exposed and shaded conditions, were associated with reductions in both stomatal (G s ) and mesophyll conductance (G m ), and an increase in the proportion of electrons consumed in non-photosynthetic ... limited and waterlogged conditions [9, 27]. Photosynthesis would also be inhibited due to the increased participation of competing pathways and consumption of electrons...

Ngày tải lên: 08/08/2014, 00:22

... Eric- sson and Ingestad [17] in birch seedlings. Conversely, under low light, RGR was independent of plant P concentration (Fig. 3). RGR did not increase with increasing plant P and no relationship ... con- ditions where the nutrient addition rate is controlled accurately. 2. MATERIALS AND METHODS 2.1. Plant material and growth conditions Seeds of maritime pine (Pinus pinaster Aï...

Ngày tải lên: 08/08/2014, 00:22

... crown dimensions, vertical and horizontal differentiation and foliage height diversity. Moderate and heavy thinning have similar effects on stand structure, but the effects of light thinning are quite ... during the dry season. Due to the existence of these problems in exten- sive areas and to the increasing interest in the implementation of direct and indirect production...

Ngày tải lên: 08/08/2014, 01:22

... concentration neither in seedlings nor in their components. Time or lifting effects on C:N in the different seedling components were inversely related to those in N concentration. Total carbon ... mechanical handling disrupt the functional continuity between soil and roots, and cause root injuries with loss of fine roots, resulting in reduced water and nutrient absorption...

Ngày tải lên: 08/08/2014, 01:22