Báo cáo lâm nghiệp: "Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands" pdf

... in May and September 1998 and in degraded sites in September 1998. Original article Diagnosing plant water status as a tool for quantifying water stress on a regional basis in Mediterranean drylands ... reference values of the water relations parameters, because in this month plants were actively growing and water availability was likely high after...

Ngày tải lên: 09/08/2014, 04:20

... under- taken to examine rooting as influenced by initial plant water potential. Materials and Methods Variation in the initial plant water potential (4!P) of Populus x euramericana ... of water balance is one of the important factors. The water balance of cuttings is affected by high transpirational water losses coupled with either low wa...

Ngày tải lên: 09/08/2014, 04:20

... communities in preventing soil acidification and base cation losses in a deforested mountain area a ected by acid deposi - tion. Plant and Soil, 268: 35–49. Table 4. Mean content of dry matter, nutrients ... element in plant biomass and undecomposed litter. Conse- quently, the swards of grasses were demonstrated to mitigate the acidification of soil solution and the leaching of...

Ngày tải lên: 07/08/2014, 03:22

... deter- mined with a CNS analyzer. Chlorine was deter- mined using argentometric titration in the plant material following decomposition with sodium carbonate. Fluoride content was analyzed by ... correlation for sulphur and potassium was significant, in ad- dition to the negative correlation for calcium and manganese. Comparing differences in individual forest type groups (FT...

Ngày tải lên: 07/08/2014, 10:21

... the lowest mean and total leaf areas in seedlings of Mediterranean oaks (Fig. 3). The reduction in the mean area of individual leaves resulted in a non-linear increase in the total number of leaves of ... efficiency can be favourable considering a long-term carbon balance of the plant [42]. While all plants exhibit a relatively high capacity for physiological protection agai...

Ngày tải lên: 07/08/2014, 16:20

... leaf biomass, seasonal changes in leaffall, and plot growth for 11 years post-thinning in a secondary deciduous hardwood stand dominated by Betula maximowicziana Regel in central Hokkaido, Japan. ... Thinning was performed in 1984. Values (stem number and basal area just before and after thinning and thinning ratio) are shown for 1984 and 1995. Plot Before thinning After thinning...

Ngày tải lên: 07/08/2014, 16:20

... competition these trees experienced was greater. A considerable number of species demonstrated amensal- ism or neutralism rather than competition, and balsam poplar basal area was associated with increased ... spruce) and shade-intolerant (aspen, poplar). A model was also tested that combined all species into a single competition in- dex (e.g. total competitor basal area vs. species-s...

Ngày tải lên: 07/08/2014, 16:21

... hybrid pine in Queensland 693 2.2. Data collection All surviving trees were measured at approximately 10 and 15 years after planting in each of the three trials for diameter outside- bark at breast ... the sample tree data. The necessity of site-specific volume equations for each taxon was further investigated using a generalized linear model that included terms for test-location a...

Ngày tải lên: 07/08/2014, 16:21

... in the stand was evaluated. Camprodon [6] as a starting point for considering this aspect in Iberian forests, although he stressed retaining as many very large trees as pos- sible while keeping ... Pinus nigra Arn. mixed stands in Catalonia, north-east Spain Antoni TRASOBARES a *, Timo PUKKALA b a Centre Tecnològic Forestal de Catalunya, Pujada del seminari s/n, 25280, So...

Ngày tải lên: 08/08/2014, 00:21

... Data analysis Data were checked for normality and a log transformation per- formed when necessary. Data were subjected to an analysis of variance (ANOVA) using SAS GENMOD [18]; followed by a ... ∆3-carene, and nonanal was used to increase trap catch of T. piniperda in a trapping study in the Jilin province (Steve Burke, pers. comm., Phero Tech Inc., Canada) This Jilin blend (JB) a...

Ngày tải lên: 08/08/2014, 00:21