Báo cáo lâm nghiệp: "Variability of initial growth, water-use efficiency and carbon isotope discrimination in seedlings of Faidherbia albida (Del ) A Chev , a multipurpose tree of semi-arid Africa Provenance and drought effect" doc

... discrimination (&permil ;). 1. INTRODUCTION Faidherbia albida (Del. ) A. Chev. (syn. Acacia albida Del ., Mimosoideae) is a wide spread African leguminous tree of great value ... (RMR) was independent of vigour and gas exchange rate, and was not correlated with the amount of rainfall in the geographical origin of provenances,...

Ngày tải lên: 09/08/2014, 04:20

... area (LMA, ra- tio of leaf mass to leaf area). Relative carbon isotope composition (δ p) of the leaves was higher in treatment C than in treatments L and S, ... canopy) originating from soil respiration (Vogel, 1978 ; Medina and Min- chin, 1980 ; Francey and Farquhar, 1982 ; Medina et al, 1986 ; Gebauer and Schulze, 199 1)....

Ngày tải lên: 08/08/2014, 23:22

... height of the tree crown, position of the tree in the stand) operate simultaneously, in uenc- ing the character and the organization of individual anatomical elements, including varying wood ... (species and genus ), environ- mental factors (soil, climatic conditions, position, mechanical forces such as wind and snow ), physi- ological and mechanical effects (age, t...

Ngày tải lên: 07/08/2014, 03:22

... and Canada. New York, McGraw-Hill, Inc.: 722. POŽGAJ A. , CHOVANEC D ., KURJATKO S ., BABIAK M ., 1997. Štruktúra a vlastnosti dreva. Bratislava, Príroda: 486. RYBNÍČEK M ., GRYC V ., VAVRČÍK H ., ... University of Agriculture and Forestry in Brno, Habrůvka Forest District, area 164 C 11. e average annual temperature in this locality is 7.5°C and the...

Ngày tải lên: 07/08/2014, 04:20

... (rotation ), their spatial arrangement, the maintenance of standards, the main features of cutting (people, season, equipment) and the main use made of the wood that has been cut. We use a scale of ... standards (C ), cutting with standards (CR ), young cop- pice without standards (R ), young coppice with standards (RR ), adult stand (P ), agricultural area (A) and f...

Ngày tải lên: 07/08/2014, 16:20

... not included in the model. Past- and cur- rent-year temperature and precipitation are examples of such variables that can explain a large part of the interannual varia- tion of ring width index ... variables explained 36% and 23% of the annual changes in ring width index and annual volume increment index, respectively. Defoliation that dated back by as much as six years...

Ngày tải lên: 08/08/2014, 00:21

... variables (64 variable classes) (Tab. II). In order to help in interpreting MCA, the presence (near sampling points) of tree trunks, former windfalls, vehicle tracks, heaps of residual branches and stumps ... time scales such as topog- raphy [28 ], parent material [48] and stand dynamics [ 3, 1 0, 1 3, 47] at a coarse scale, and microbial communities [53] or root...

Ngày tải lên: 08/08/2014, 00:22

... increases with Ir, as observed by many authors (Sandford and Jarvis, 1986; Tan et al ., 1977; Running, 197 9). In midday, when gs variance and mean are high, the general pattern ... In the pre -drought period, the stomatal response to air water vapor deficit and irradiance explains 52% of the total gs variation; gs decreases as D in...

Ngày tải lên: 09/08/2014, 04:20

... the absolute growth rate of a branch adapts in a way similar to that of nitrate dosage. As the availability of (reduced) nitrate in the plant becomes limiting, the expansion ... rate (RGR) and the age of the organ; and 2) are independent of irradi- ance. Consequently, the absolute growth rate of such a branch cannot adapt to...

Ngày tải lên: 09/08/2014, 04:20

... to calculate the most likely of the four rot risk classes as a function, for each fixed basal area, of the age and the dominant height of the stand, obtaining for each value of basal area a graphic ... Junta de Andaluc a, Sevilla, 2004. [25] Montero G ., Cañellas I ., Selvicultura de los alcornocales en Espa a, Silva Lusitana 11 (200 3) 1–19. [26] Nagaike T ., Hayas...

Ngày tải lên: 07/08/2014, 16:20