Báo cáo lâm nghiệp: "Ectomycorrhizal colonization of Alnus acuminata Kunth in northwestern Argentina in relation to season and soil parameters" potx

... 10.1051/forest:2005027 Original article Ectomycorrhizal colonization of Alnus acuminata Kunth in northwestern Argentina in relation to season and soil parameters Alejandra BECERRA a *, Karin PRITSCH b , ... Venezuela to latitude 28° S in northwestern Argentina [21]. Given its ability to form ectomycorrhizal (ECM), endomycorrhizal and actinor- rhizal re...

Ngày tải lên: 08/08/2014, 00:22

... growing season, 66% of phloem remained live or in the first stage of wilting. ere is available wood for the invasion of secondary cambiophages in the following growing season. Standing breaks ... turn of June/July and at the end of the growing season, 90% of phloem being heavily wilted or dead. On standing breaks, the progress of the phloem dying was gradual. At t...

Ngày tải lên: 07/08/2014, 04:20

... Pielou-Mountford index its pattern is random.  e distribution of the tree layer individuals was random according to two structural indices (Hopkins-Skellam and Pielou- Mountford) and regular according to ... presented separately for beech stands, mixed stands, spruce stands, stands in the timberline ecotone and relict pinewood. The numbers and distribution of natural a...

Ngày tải lên: 07/08/2014, 10:21

... and infestation with the eight-toothed spruce bark beetle. In 1992–2003 the trend of foliage sta- bilized again. In 2004 there was another increase in defoliation as a result of the eight-toothed ... models of development describe the trend of development in a satisfactory way (changes in defo- liation from year to year). Beech stands Dynamics of mean foliation of...

Ngày tải lên: 07/08/2014, 10:21

... planning and handling of sap flow mea- surements based on a minimum of sensors, some physical and mathematical considerations are required. The entire problem of combined heat and mass transport in ... Experiments combining heat sen- sors and heat field imaging have opened a reasonable path towards handling the problem, as shown in this publication, and added to the notion...

Ngày tải lên: 07/08/2014, 16:20

... sites despite the varying values for stand age and stocking densities. The decreasing rate of the BEF as a function of age was steeper in the Czech Republic than in Finland according to Lehtonen et al. ... preci- sion of BEFs would be the reduction in error of the biomass and volume models (Fig. 5). Examining the sensitivity in un- certainty of the BEF by ignoring the...

Ngày tải lên: 07/08/2014, 16:20

... Osmotic adjustment in Pinus pinaster cuttings in response to a soil drying cycle, Ann. For. Sci. 59 (2002) 795–799. [36] Niinemets Ü., Role of foliar nitrogen in light harvesting and shade- tolerance of four ... Ψ pd and Ψ min in all measurement dates (P < 0.001), except at the beginning of the two soil- drying cycles (July 23 and Oct 3), when soil water moistu...

Ngày tải lên: 08/08/2014, 00:22

... Warwick, U.K., 2 Institute of Horticultural Research, East Malling, Maidstone, U.K., and 3 Istituto Sperimentale per la Frutticoltura, Trento, Italy Introduction In drought, the ... the remainder of the trees being retained as well-watered controls. Two ultrasound transducers were attached to stems of pairs of trees to record counts over 5...

Ngày tải lên: 09/08/2014, 04:20

... girdling the hypocotyl of Pinus sylves- tris plantlets mycorrhized by Hebeloma crustuliniforme or Paxillus involutus. This stops the flow of sugars to the roots. We examined ... leading morphologically in the pine to the swelling of the stem above the ablation (Fig. 1 ) and in the fungal partner to the more or less complete disappearanc...

Ngày tải lên: 09/08/2014, 04:20

... Malaise traps in the Nízký Jeseník Hills, the flight activity started at the beginning of May and ended in mid-June with the peak at the end of May and beginning of June in 2005. In 2006, the ... later in mid-May and lasted to the beginning of July but was interrupted by cold and rainy weather. At higher altitudes were beetles sampled only in the first half of...

Ngày tải lên: 07/08/2014, 03:22