TAILIEUCHUNG - Báo cáo lâm nghiệp: "Changes in the mycorrhizal status of some mountain spruce forests"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Changes in the mycorrhizal status of some mountain spruce forests. | JOURNAL OF FOREST SCIENCE 53 2007 Special Issue 82-88 Changes in the mycorrhizal status of some mountain spruce forests V. Peskova Forestry and Game Management Research Institute Jtloviste-Strnady Czech Republic ABSTRACT In the present study the defoliation status of spruce stands is related to mycorrhizal conditions and presence of mycorrhizal macromycetes fungi in two localities at the highest sites of the Krkonose Mts. In the longterm view the defoliation and the diversity of mycorrhizal fungi have improved but the number of active as well as nonactive mycorrhizae has decreased while their ratio has not changed. Statistically significant is the correlation between the total number of mycorrhizae and pH. The results within last years of observations as well as in comparison to the conditions in the last decade show that mountain spruce stands growing at non-exposed sites are tolerant to a degradation of mycorrhizal conditions resulting from the long-term air pollution impact. The studied parameters of mycorrhizal symbiosis have not shown a clear trend their results however indicate the stabilized mycorrhizal state. Positive changes can be seen in the total increase of macromycetes diversity as well as in the apparent increase of percentage of macromycetes in the studied localities which correlates to the moderately improving defoliation. Keywords mycorrhizae root mycorrhizal fungi defoliation Picea abies Development of tree health conditions is influenced by many abiotic and biotic factors that are often correlated to each other. In most cases a direct influence of individual factors cannot be therefore simply distinguished. It is not often easy to define the causal direction and to define dependent and independent variables. The health conditions of mountain forests have been intensively studied in the last decades. Their unfavorable development continues even though the major air pollution caused by the power stations have been eliminated. Mountain spruce .

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