Báo cáo lâm nghiệp: "Dendrochronology of pedunculate oak (Quercus robur L ) in an old-growth pollarded woodland in northern Spain: establishment patterns and the management history" ppt

... com- plete pollarded woodlands. This work is a dendrochronological reconstruction of the management history in Tragamón, an old-growth oak wood- land located in the Cantabrian lowlands, northern ... decreased, particularly since 1917 in mature trees, and since 1905 in old- growths (Figs. 4 and 5). The loss of the pollarding practice, especially during th...

Ngày tải lên: 08/08/2014, 00:21

... responses of radial growth in pedunculate oak (Quercus robur L. ) to climate were investigated in an old-growth woodland in the Cantabrian lowlands, northern Spain. This was done by using correlation analysis, ... of an age- independent climate-growth relationship for oak in the studied locality is unreliable, and anticipate the probable response...

Ngày tải lên: 08/08/2014, 00:21

... behaviour [39 ]), the low oak LAI (cater- pillars and decline) can explain those low rates of transpiration, which in turn can explain the low T/PET, PET being relatively very much higher and therefore ... respec- tively 3.6, 3.1 and 3.5 in the thinned plot (75% from pedunculate oak, 14% from Q. rubra and 5% from Acer) and 4.3, 3.7 and 4.2 in the con- trol...

Ngày tải lên: 08/08/2014, 00:22

... Control). Evapotranspiration in a declining oak stand 621 was deficitary (–78 mm) in leafy period, in particular in May (–11.6 mm) and July (–32.5 mm). Rainfall interception (In %) during the leafy ... sessile oak stand with LAI of 3.3. The intra- and inter-annual variations, not always well correlated with LAI, probably result from (i) the type of rain and (ii...

Ngày tải lên: 08/08/2014, 00:22

... Galice Abstract – Autoecology of oaks (Quercus robur L. ) in Galicia (Spain). A parametric characterization of the biotypes currently in stands of “carballo” (Quercus robur L) in Galicia (Spain) is presented. ... R., The ecology and silviculture of oaks, CABI Publishing, Wallingford, 2002. [41] Kelly D .L. , The regeneration of Quercus petraea (sessil...

Ngày tải lên: 08/08/2014, 00:22

... vacuum, and 200 L pyridine and 50 L of a mixture of N,O-bis(trimethylsilyl)-trifluoracetamide (BSTFA) and trimethylchlorosilane (volume combination 9 + 1) were added. For silylization, the samples ... CHNOS-analyzer (vario EL III, Ele- mentar-Analysensysteme, Hanau, Germany), with acetanilide as a standard. For the determination of soluble sugars and cyclitols, 20 mg o...

Ngày tải lên: 08/08/2014, 01:21

... suppressed. eir qual- ity is low but they ful l their auxiliary role in stands and therefore they could be kept in the stand for the nearest future. e slenderness quotient has an increasing ten- dency ... depicting two layers of wild cherry trees in the stand. e vertical and horizontal structure analysis also shows that in middle aged stands wild cherry trees wh...

Ngày tải lên: 07/08/2014, 03:22

... medium- skeletal in their organic-mineral layers, and strongly or very strongly skeletal (stony) in deeper layers. In their granulometric composition these are mostly medium and light clays and sometimes ... diminishes), and rapidly decreasing content of calcium (Tables 2 and 3). A similar distri- bution of the forms of magnesium and a low content of calcium,...

Ngày tải lên: 07/08/2014, 10:21

... types with low levels of fir browsing, and an abundance of spruce regeneration containing browsed fir seedlings (Fig. 1). An analysis of the global level of brows- ing (grouping all types of regeneration) ... wolves), and more recently, to the rapid rise in ungulate populations [28, 53]. These changes in forest and wildlife management modified the interaction...

Ngày tải lên: 08/08/2014, 00:21

... cochinchinensis and Symplocos stel- laris) in the NF, 12 of C. kawakamii in the CK, 11 of O. xylocarpa in the OX, 12 of F. hodginsii in the FH, and 12 of Chinese fir in the CF were felled. The selected ... rainfall, steep slopes and fragile soil are characteristic, the establishment management practices for plantations in the initial years, includ...

Ngày tải lên: 08/08/2014, 00:22