Báo cáo lâm nghiệp: "Comparison of nitrogenase and nitrate reductase activities in two nitrogen-fixing tree species: black alder (Alnus glutinosa) and black locust (Robinia pseudoacacia)" pdf

... .1 30 Comparison of nitrogenase and nitrate reductase activities in two nitrogen-fixing tree species: black alder (Alnus glutinosa) and black locust (Robinia pseudoacacia) G. ... temperate zone, black alder (Alnus glutinosa, L. Gaertn.) and black locust (Robinia pseudoacacia L.) can be re- garded as typical actinorhiza...

Ngày tải lên: 09/08/2014, 04:20

... air pollution induced decay of forest stands in the mountain regions of the Czech Re- public in 1970s to 1990s, there was a problem of autochthonous tree species planting failure on the climatically ... share of soil under blue spruce in study of P et al. (2005) corresponds with our outcomes (34.6% in Grass horizon, 32.0% in L + F1, 25.6% in F2 + H and 1...

Ngày tải lên: 07/08/2014, 03:22

... growth and reproduction, the second one by those which attack the wood of standing living trees. Some fungi of the latter group can invade and kill living sapwood causing death to living trees ... process in a living tree is a complex chain of environmentally in uenced events driven by stress, competition and disturbance (R, B 1986). ere are two basic groups...

Ngày tải lên: 07/08/2014, 03:22

... in throughfall and rainfall sums were the result of different leaf area index and stand density of the studied stands. Water intercepted by the stand canopy of the sparse stand was vaporized ... deposition fluxes of Ca, Mg, K, S-SO 4 , N-NO 3 and N-NH 4 in the dense and sparse spruce stand were 15.7 and 11.6, 4.2 and 3.0, 19.2 and 12.7, 22.5 and 16.4, 8.9 an...

Ngày tải lên: 07/08/2014, 04:20

... weaker in plugs at the time of outplanting in 2004, equalized with that of bareroot plants within two years. e shoot height that was identical in both types of planting material at the time of ... regen- eration. Intensive technologies for the production of containerized seedlings and plants are increasingly used in the present nursery practices. If all principles...

Ngày tải lên: 07/08/2014, 10:22

... be- ing a general rule relating forest from Spain and Latin Amer- ica. The lack of this information in some regions constrains the understanding of global C dynamics. To help address this lack of ... extreme values were eliminated and expressed as average of the raining and less raining periods of 2 years [21]. The soil sampling was done by 3 composites samples from each hor...

Ngày tải lên: 07/08/2014, 16:20

... between the two bearing points, a the distance between the two loading points, b is the width and h the height of the specimen. 2.9. R, T, L Shrinkage Longitudinal, radial and tangential shrinkage ... Crushing strength in compression parallel to the grain. CSSB: Crushing strength in static bending. 2.7. Crushing strength in compression parallel to the grain (ISO standard 3132:...

Ngày tải lên: 07/08/2014, 16:21

... [22]. The new wood was obtained from six trees felled during scheduled cutting of Pinus sylvestris L. in the Valsaín Forest in Segovia, Spain, located in region of origin 10, Sierra de Guadarrama ... Faculty of the Virginia Polytechnic Institute and State University for the degree of Doctor of Philoso- phy in Wood Science and Forest Products, Virginia, 2002. [32] Siau J....

Ngày tải lên: 08/08/2014, 00:22

... is proof of the importance of pore size in the TDR reading. The bias found when the soil was drying (–0.8 cm 3 cm –3 ) was greater than in other periods (–0.06 when undergoing wetting, and 0.10 ... ecosystems has increased owing to the appearance of evidence of changes in the annual distribution of rainfall and a hypothetical reduction in the actual evapotranspiration as...

Ngày tải lên: 08/08/2014, 01:21

... cost (including travelling, loading and unloading cost) or travelling costs (without loading and unloading cost) are used in the calculation us- ing observations from a forwarding study in Austria. ... Journal of Forestry, 72: 207–210. LIU S., CORCORAN T.J., 1993. Road and landing spacing under the consideration of surface dimension of road and landings. International Jo...

Ngày tải lên: 07/08/2014, 04:20