Báo cáo lâm nghiệp: "Perception of the forest by the villagers of the Salonga National Park in the Democratic Republic of Congo" doc

... availability by increasing their resistance to cavitation [13], one of the major causes of decline in the botanical species in the absence of water [5]. In contrast, Acer species are more restricted to their ... determining drought tolerance in plants [30]. Catastrophic xylem dysfunc- tion occurring through the entire xylem results in the death of the plant [29...

Ngày tải lên: 08/08/2014, 01:22

... COMMUNICATION Perception of the forest by the villagers of the Salonga National Park in the Democratic Republic of Congo J. M. I Faculty of Forestry and Wood Technology, Mendel University of Agriculture and Forestry ... Proposal of a sustainable management of the Salonga National Park in the Democratic Republic of Congo. [Ph.D. ...

Ngày tải lên: 07/08/2014, 03:22

... present at both the forest- line and the treeline in the first decades of the 20th century, fa- voring the establishment of larch cohorts. These cohorts were browsed by the remaining domestic ungulates ... 3). Since the decade of the 1960s there has been a new reduction of grazing intensity and in most of the trees established in the first decades of t...

Ngày tải lên: 07/08/2014, 16:20

... other standing trees. No such negative browsing occurs in forests where juve- nile thinning is carried out in spring or summer. is way of felling timing enables quick bark withering and the ... follows: Fig. 3. Content of P in pine and spruce bark in the course of 2-year investiga- tion Fig. 4. Content of Mg in pine and spruce bark in the course of 2-year in...

Ngày tải lên: 07/08/2014, 04:20

... du grain / lignine 1. INTRODUCTION Genetic improvement and intensive silviculture of loblolly pine (Pinus taeda L.) have increased forest plantation produc- tivity significantly in the southern ... estimated by the Delta Method [9]. Individual-tree breeding values were estimated by adding parental general combining ability estimates to the estimated within-family value (Aw). Wi...

Ngày tải lên: 07/08/2014, 16:20

... growth rings, with the ring parallel to the tangential grain of the wood. The longitudinal direction was colinear to the longitudinal axis of the spec- imens. The specimens were stabilized in a ... from 7 (4 in Letestua) to 20 (50 in Cunonia) in the “poor” specimens. The vessels were solitary and in radial multiples of 2 to 4 in most of the woods, but t...

Ngày tải lên: 08/08/2014, 00:22

... at the self-thinning limit (figure 3). The influence of site quality on the intercept of the self-thinning line was examined by adding the site index to the model as an independent variable. The ... straight self-thinning line of a constant slope. Nevertheless, the suitability of these two theoretical relations for describing the self-thinning process has been call...

Ngày tải lên: 08/08/2014, 01:21

... topographic position within a forest. Because of this, the examination of nutrient dynamics along interstand topographic gradients may be used to examine hypotheses relating fertility to nutrient content ... near the Didim town (Aydin; 37° E , 28° N) which is situated on the southwest part of Turkey. The canopy individuals were 15 years of age and had no obvious sign of d...

Ngày tải lên: 08/08/2014, 01:21

... and dehesas in the Iberian Peninsula and one of the most important forest species occurring in Por- tugal. The most striking feature of these oak stands is their savanna-like ... among the different parts of the crown, decreasing in the sequence east - south - west - north (table II). They were recorded during spring, and generally i...

Ngày tải lên: 08/08/2014, 18:21

Ngày tải lên: 07/08/2014, 03:22