Báo cáo lâm nghiệp: "Soil carbon dioxide efflux in pure and mixed stands of oak and beech" potx

... TSR in the oak, mixed and beech stands. The annual heterotrophic respiration of the forest floor ac- counted respectively for 68, 74 and 51% of the annual FFR in the oak, mixed and beech stands ... 10.1051/forest:2006098 Original article Soil carbon dioxide efflux in pure and mixed stands of oak and beech Mathieu J * , Frédéric A  ´ , Franço...

Ngày tải lên: 07/08/2014, 16:20

... interpretation of the data is that the efficiency of root system in terms of plant growth remains stable at least in that first growing period of plant in the forest disregarding their functions of conduction ... explaining 92% of the relationship. An adequate proportion of fine roots (thinner than 2 mm) in the root system is another important parameter of planting s...

Ngày tải lên: 07/08/2014, 03:22

... dug in these 10 locations and with the use of cylinder and standard sand, field soil compac- tion tests were carried out. Each pit was 10 cm in diameter and 15 cm in depth, the soil content of ... that in skidding opera- tions using wheeled skidders, the severest compac- tion occurred at 10 cm depth of soil and the effect of compaction decreases with an increase in s...

Ngày tải lên: 07/08/2014, 03:22

... T I. (2004): N and P leaching and microbial contamination from intensively managed pasture and cut sward on sandy soil in Finland. Agriculture, Ecosystems and Environment, 104: 621–630. S ... layers and the mineral soil in forest stands dominated by silver birch. CONCLUSIONS Referring to properties of soils under broadleaved tree species, Humic Regosols in...

Ngày tải lên: 07/08/2014, 03:22

... 149 derplantings increases with a decreasing content of these nutrients in needles. An opposite correlation was determined for aluminium: with an increasing proportion of this element in nutrition ... limit of the lower optimum of 130 mg·kg –1 . In the subsequent organomineral horizon (Ae/Ep) the values of Ca indicate the lower optimum reserves in the range of 80–160...

Ngày tải lên: 07/08/2014, 10:21

... (P 2005). At the mine development stage in the 1970s and 1980s some parts of the pits were scheduled to be mined again. However, falling demand for filling sand and mining restrictions meant ... objective of ecological research at post-mining sites is to iden- tify the dominant processes and temporal trends in ecosystem development and to use indicators of e...

Ngày tải lên: 07/08/2014, 10:22

... horizons of particular stands. The content of plant available phosphorus increased especially in the oak and Grand fir stands, showing upward tendencies in all parts of the young stand. Potassium ... fir and broadleaved stands, the increase in upper horizons (L, F) was documented for Grand fir and broadleaves. This probably indicates the increased uptake of the...

Ngày tải lên: 07/08/2014, 10:22

... scandinavius, T. albipes and G. marginata and the woodlouse P. muscorum had the highest relative densities in old stands dominated by mull humus and were linked to high herbaceous biomass and ... Species occurring in less than 3% of the sampling points were removed from the data set, so the final matrix consisted of 45 lines (sampling points) and 14 columns (identified speci...

Ngày tải lên: 07/08/2014, 16:20

... the declining stand (end of September). At the beginning of the dry period, the decrease in soil matric potentials was steeper in the declining stand in both 15 and 40 ... oaks of the declining stand. In RWC, the most distinct differences were found in comparison of healthy and moderately damaged oaks, irrespective of the degree of...

Ngày tải lên: 08/08/2014, 18:21

... (6): 290–298 and managing responsibly. Openness and flexibility in reacting to changing societal needs and values, understanding of the ecological, social and economic drivers determining their ... addresses the time perspective (permanent and continuing), the kinds of activities (maintaining and creating), the objectives (needs and goals), and the qualifying criteria...

Ngày tải lên: 07/08/2014, 03:22