Báo cáo lâm nghiệp: "Can sales of infested timber be used to quantify attacks by Ips typographus (Coleoptera, Scolytidae)? A pilot study from Belgium" ppt

... the inventory takes 10 years to be completed. An alternative method is needed for a rapid assessment of infestations. In this paper, we evaluate whether data from sales of attacked timber can be used to ... an out- break of I. typographus in 1991–1992. Information on attacks by the bark beetle was extracted from timber sales for 1988 to 1996. In Belgium,...

Ngày tải lên: 08/08/2014, 01:22

... broadleaved forest trees. Better familiarity with Phytophthora species, appropriate cultivation of plant material and sanitary practice are of great importance to prevent potential substantial ... C.M., K S .A. (2001): Comparative aggressive- ness of standard and variant hybrid alder phytophthoras, Phytophthora cambivora and other Phytophthora species on bark of Alnus, Quer...

Ngày tải lên: 07/08/2014, 10:21

... dynamic of the biodegradation of organic matter, the nature of water extractable organic compounds, their role in mineral availability, and/or as antimicrobial agent controlling dynamic and activity ... quality and quantity of organic matter have to be considered as main parameters controlling organic matter biodegradability and mineralization. The decrease of WEOC observed for...

Ngày tải lên: 07/08/2014, 16:20

... coefficients between breeding values estimated from analysis of variance without bud burst as covariate (above diagonal) and from analysis of variance with bud burst as co- variate (bellow diagonal). ... using a six-level scale from 0 to 100% (of foliage damaged area), by 20%. Bud burst data was also assessed in March of years 2004 and 2005 at Areas and in 2005 at Sergude, f...

Ngày tải lên: 07/08/2014, 16:20

... these data. MGT was calculated as the mean number of days for the seeds to germinate [26]. If no seeds germinated, MGT was assumed to be 42 days to permit analysis of variance [24]. 2.5. Data analyses 2.5.1. ... endosperm that is surrounded by a pericarp. Endogenous factors, especially plant growth regulators, such as gibberellins (GAs) (usually GA 3 ) and abscissic acid (ABA)...

Ngày tải lên: 07/08/2014, 16:21

... could be similar or higher than that based on RAPDs [3, 25], this may be attributed to (i) the higher number of analysed individuals per population in allozyme data that allows to an increasing allozyme ... L. (Myrtaceae) populations assessed by isozymes and RAPDs Chokri Messaoud a ,MakremAfif a , Abdennacer Boulila a , Mohamed Nejib Rejeb b , Mohamed B oussaid a * a Nat...

Ngày tải lên: 07/08/2014, 16:21

... explanation of a partial mismatch among root hydraulics, chemical and anatomical properties, and measured water absorption is the fact that addi- tional factors, which may control water flow into ... under water and measuring water uptake volumetrically, the gauge data can easily be calibrated by an independent method [9]. In contrast to earlier attempts to measure root sap flow...

Ngày tải lên: 08/08/2014, 01:21

... foliage dam- age (S et al. 1998), thereby a ecting carbon fixation. e relatively quick recovery can be due to the assimilatory apparatus regeneration. An increase in temperature of about ... in many areas and separation of latewood has proved to be almost impossible when the rings are really narrow. H et al. (1995) noted that the δ 13 C value of early wood corre...

Ngày tải lên: 07/08/2014, 03:22

... (left image) is identical to that with temperature equal to 20 ◦ C (right image) and was characterized by the same eccentricity of ellipse. Increase of temperature was caused by increase of stem ... circle. What can be learned from the analysis of such ellipses? 3.2.1. Evaluation of sap flow from infrared heat field images There are basically two phenomena involved in th...

Ngày tải lên: 07/08/2014, 16:20

... 10.1051/forest:2005001 Original article Seasonal changes of plant hydraulics, water relations and growth of Aesculus hippocastanum seedlings infested by the leafminer Cameraria ohridella Fabio RAIMONDO, Patrizia TRIFILÒ, ... The leaf miner Cameraria ohridella causes premature defoliation in Aesculus hippocastanum. The impact of the parasite on seasonal changes of water relations,...

Ngày tải lên: 08/08/2014, 00:21