Báo cáo lâm nghiệp: "Growth and yield model for uneven-aged mixtures of Pinus sylvestris L and Pinus nigra Arn in Catalonia, north-east Spain" pptx

Ngày tải lên: 07/08/2014, 16:20

... Miina J., Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain, Ann. For. Sci. 61 (2004) 9–24. [25] Trasobares A., Pukkala ... Pukkala T., Using past growth to improve indivi- dual-tree diameter growth models for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra...

Ngày tải lên: 08/08/2014, 00:22

... behaviour of the model of Clutter and Allison [10], in spite of this model was used to estimate the height of individual trees in a growth model for Pinus radiata in New Zealand. The values of the ... Forestales 10 (2001) 111126. [10] Clutter J .L. , Allison B.J., A growth and yield model for Pinus radiata in New Zealand, in: Fries J. (Ed.), Growth Mod...

Ngày tải lên: 08/08/2014, 01:21

... blunt cutting edge does not cut the material in the process of chip cutting. It is mainly in the plain passing the lowest point of the cutting edge but it is also in the plain lying a little bit ... and they are most frequently used in crosscutting lines when handling thin and medium stems (up to 40–50 cm). eir advantages are high cutting ability, maintainability and...

Ngày tải lên: 07/08/2014, 03:22

... measuring the projected length l of a calibration sample of length L placed in the object’s plane: μ = l/ L(2) where, l is the length of the projection, and L is the real length. In reality, a ... should be at least 50% of total tree height. In younger and denser stands, tree height will also be less and therefore the total height of the stem we wish to photogra...

Ngày tải lên: 07/08/2014, 16:21

... distance-independent diameter growth model, a static height model, an ingrowth model and a survival model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia (north-east ... Geographical distribution of sample plots representing pure stands and mixtures of P. sylvestris and P. nigra in Catalonia. Growth and yield...

Ngày tải lên: 08/08/2014, 01:22

... had taller shoots, larger root collar di- ameters and higher weight and volume of shoots and root systems. In seedlings grown in the sun a higher number of leaves, larger total leaf area and ... the initial values.  e maximum quantum yield of Fv/Fm of leaves growing in the shade after transfer to a gap was still lower after 30 days than in the leaves of plants...

Ngày tải lên: 07/08/2014, 10:21

... availability. (See text for explanation.) Total N pool per plant (N pool ) and whole-plant nitrogen concentration ([N] plant ) were calculated following the same rationale. 2.5. Data analysis Interpretation ... differently affected by watering in Q. ilex and Q. faginea, being higher at MW and at HW in the former and in the latter, respectively. Therefore, no species followed a c...

Ngày tải lên: 07/08/2014, 16:20

... sites, plant allocation patterns were mainly explained by tree size. The first year after planting, hybrid poplar grew very little and thus initial size at planting and particularly stem length (since ... nitrogen immobilization processes following logging [49]. Finally it is possible that the complete removal of the com- petitive vegetation following herbicide application increased soil...

Ngày tải lên: 07/08/2014, 16:20

... trees and 5 widely spaced standards. In addition, one forest site with natural regeneration of oak (Q. robur) under pine (Pinus sylvestris L. and Pinus pinaster Aiton) was selected as well. Within ... that influences the overall quality of timber. For oak, the density is mainly controlled by the cambial age and the ring width [33]. The amount of the denser latewood will...

Ngày tải lên: 08/08/2014, 00:22