Báo cáo lâm nghiệp: "Forest and shrubland canopy carbon uptake in relation to foliage nitrogen concentration and leaf area index: a modelling analysis" ppt

... foliage nitrogen concentration and leaf area index: a modelling analysis David WHITEHEAD a *, Adrian S. WALCROFT b a Landcare Research, PO Box 69, Lincoln 8152, New Zealand b Landcare Research, ... (f.) Poole and Pinus contorta Douglas ex Loudon spp. contorta at alpine and subalpine altitudes, in: Waring R.H. (Ed.), Carbon Uptake and Allocation in Subalpin...

Ngày tải lên: 08/08/2014, 00:22

... followed by road and water stream bank maintenance. Timber transport and timber harvesting are considered as the least important activities (differences among the localities are insignificant). e ... the localities are insignificant. It means that the respondents who came to the forest seeking recreation and relaxation advance their interests (though maybe inadvertently) and th...

Ngày tải lên: 07/08/2014, 10:21

... volume is taken as large sized inside-bark timber at full stocking for the main stand. Commercial value of assortments was obtained from actual market timber prices in the years 1997 to 1998. ... cutting activities were calculated according to actual work standards in the range of tree species volume classes, age classes, site indexes and using socio-economic information on for...

Ngày tải lên: 07/08/2014, 10:21

... by Al-Engineering Oy in Finland. is deflectometer is today used by more than 60 research organizations, universities and research workplaces in Canada, Estonia, Finland, India, Israel, Italy, ... measuring the bearing capacity of forest soils in many cases. MATERIAL AND METHODS e measurement was made by using portable falling weight deflectometer Loadman II USB and Eijkelkamp...

Ngày tải lên: 07/08/2014, 10:21

... “Reciprocal averag- ing” (RA). All vectors are projected into the main axis as a super-ellipsoid. In the second phase, par- tial complexes of vectors are divided according to species ordinate in particular ... particular vectors and accord- ing to abundance of particular species (indicators) as well. ese indicators are automatically selected by the program in compliance wit...

Ngày tải lên: 07/08/2014, 03:22

... population of paths of each tree (eq. [1]) and the true totals and variances of the target variables and the estimates of the totals, respectively. Choice of the auxiliary variable and variance of ... strata, the decrease varied between 50% (European mountain ash) and 85% (old pine). Keywords: randomized branch sampling; multistage sampling; unequal selection probabilities; auxilia...

Ngày tải lên: 07/08/2014, 03:22

... continuously adjusted according to changing human needs. e history of Ranšpurk and Cahnov-Soutok Na- tional Nature Reserves (hereinafter Ranšpurk and Cahnov-Soutok) has been described in many texts ... Juglans nigra outside the area of concentrated plantings in Ranšpurk and its total absence in damper and lighter Cahnov-Sou- tok. A decrease in the presence of Querc...

Ngày tải lên: 07/08/2014, 03:22

... (1992) also reported fast discharge from large pores within the drainage-treated area. Subse- quently, an adjacent non-drained area releases more water compared to the treatment. is relationship ... unit hydrographs obtained using a common approach had to be approximated by the least-squares method. Final hydrographs reflected both drainage treatment and for- est stand growth i...

Ngày tải lên: 07/08/2014, 10:21

... enough. is fact forced us to divide the Czech Republic (Table 5) into smaller areas and to evaluate the length of forest roads and other parameters at a smaller scale. e small area gives the ... morphological parameters 19 m/ha by obtainable efficiency 80% and average geometrical skidding distance 170 m; in mountains with unsuit- able values of morphological parameters 2...

Ngày tải lên: 07/08/2014, 10:21

... that higher water supplies ap- parently imposed to Q. ilex [10]. Regarding Q. faginea,thein- creased of C/N with watering was paralleled by [N] decline and by N pool increase, showing that a larger ... that tissue growth demands quite a constant proportion of carbon and nitrogen. Therefore any factor decreasing the uptake of either carbon or nitrogen would limit plant growt...

Ngày tải lên: 07/08/2014, 16:20