Báo cáo lâm nghiệp: "Effects of extending rotation period on plant species diversity in Larix kaempferi plantations in central Japan" pps

... the plant species diversity of forest-floor vege- tation in long -rotation L. kaempferi plantations, as compared with that of standard -rotation plantations and abandoned cop- pice forest, in central ... 31]). Thus, investigation of plant species diversity in long -rotation plantations requires compa- rison with standard -rotation plantations. Roberts and...

Ngày tải lên: 08/08/2014, 01:22

... as in this investigation. Pine weevils may avoid open mineral soil areas because of the risk of overheating during sunny periods [1] or because of the higher risk of predation on such areas. In ... was the dominant species in 90% of the planting spots in October 1999. Hairy grass also dominated in the scarified patches, the corresponding values being 83% for patches s...

Ngày tải lên: 08/08/2014, 01:21

... cylinders con- taining only an anion exchange resin bag were used; From April 1996 to September 1996, six cylinders containing an anion resin bag and six cylinders containing a cation resin bag ... centimeter of soil in each cylinder was removed and replaced by a Nylon bag containing 40 g of resin mixed with 40 g of glass beads to increase the volume of the bags. Six cylinders conta...

Ngày tải lên: 08/08/2014, 01:21

... Inter- estingly, the observed effects on cc were obtained while the intrinsinc water use effi- ciency (A/g w ratio) was kept constant, under- lining the good coordination ... to 80% of controls. DISCUSSION The suppression of Ca2+ in the nutrient solu- tion resulted in a very significant decrease in Ca and Mg contents in the leaves of Qu...

Ngày tải lên: 08/08/2014, 18:21

... nature and the direction of the responses in a range of plant species. In this paper, we investigate the effects of elevated CO 2 on Quercus suber L seedlings, a Mediterranean ... two Eucalyptus species of the wet-dry tropics of Aus- INTRODUCTION To understand and predict the impact of increasing CO 2 upon natural vegetation, it is nec...

Ngày tải lên: 08/08/2014, 18:21

... the runoff into components using the analysis of hydrograph by separation its recession limb and determining only the runoff con- stituents and their comparison also in the process of time. ... seasonally in late winter, spring and early summer. Areas enclosed with a dashed line act as source areas only during wet periods rich in precipitation. e only periods when the whole are...

Ngày tải lên: 07/08/2014, 03:22

... creation of a fat body in females of Lochmaea caprae (L.) Differences of imagoes in the consumption of food in particular variants cannot be confronted with findings obtained under conditions of ... 17–23 the proportion in feeding according to sex could not be evaluated. CONCLUSION e input of nitrogen into a plant through soil became evident by the increased content...

Ngày tải lên: 07/08/2014, 10:21

... another factor indicat- ing man-conditioned acidification of the soil profile. According to the classification of buffer zones, the spruce monoculture occurs predominantly in the aluminium zone, which ... Distribution of pH KCl in layers of forest floor and orga- nomineral horizon in different forest stands Fig. 3. Distribution of pH H 2 O in layers of forest floor and orga-...

Ngày tải lên: 07/08/2014, 10:21

... seedlings were thinned to one per container. Inoculation treatments were performed with spores of the five fun- gal species plus non-inoculated control plants. One-month-old seedlings were inoculated ... produce containerised Pinus species, including P. pinea [15, 28, 32]. The highest mycorrhization rates of P. pinea seedlings were obtained with spores of R. luteolus and R. roseol...

Ngày tải lên: 08/08/2014, 00:22

... compensation du sol 1. INTRODUCTION Different authors, [7, 11, 23] have underlined the importance of climatic conditions operating on the tree seedlings during the first year of planting on the ... the lack of water, especially during the summer months [3, 10, 19, 29]. This is the reason why the introduction of seedlings linked to the site preparation focused on concentrating ru...

Ngày tải lên: 08/08/2014, 00:22