tailieunhanh - Báo cáo lâm nghiệp: "The first reaction of soil mite fauna (Acari, Mesostigmata) caused by conversion of Norway spruce stand in the Szklarska Poręba For"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: The first reaction of soil mite fauna (Acari, Mesostigmata) caused by conversion of Norway spruce stand in the Szklarska Poręba For. | JOURNAL OF FOREST SCIENCE 55 2009 5 234-243 The first reaction of soil mite fauna Acari Mesostigmata caused by conversion of Norway spruce stand in the Szklarska Porẹba Forest District M. Skorupski G. Butkiewicz a. Wierzbicka Department of Game Management and Forest Protection Poznan University of Life Sciences Poznan Poland ABSTRACT To observe the first reaction of Mesostigmata mites for conversion of even aged spruce stands under conversion with common beech and silver fir four pairs of experimental plots directly neighbouring each other were examined. On the spruce stands that started to be converted into beech or fir stands a few years ago some significant composition and quantitative changes can be observed as regards Mesostigmata order mites. The first reaction of Mesostigmata mites after starting of forest conversion was an increasing number of mite species in the plots. On the plots with relatively close occurrence of beech increasing number of specimens was also observed in plots under conversion. The share of Parasitidae family mites was decreased on the converted plots with relatively close occurrence of beech. On the converted spruce stands the percentage share of Uropodina suborder mites was found to increase or remain high. Keywords Acari Mesostigmata mites forest conversion biodiversity soil ecology The Szklarska Porẹba Forest District is located partly in the Karkonosze and Izera Mts. Poland SW . The mountains are old doom-shaped with soils of low fertility. They consist mainly of acid rocks including granite and sandstone with low volume of calcium carbonate. The calcareous formations are to be found only as small lenses of limestone. Acid rock such as granite and porphyry form a basis for the poorest soils Zarẹba 1986 . In the last 150 years the species composition of the mountains forest stands has undergone significant changes. Due to economic reasons natural stands were converted into artificial monocultures of Norway spruce Picea abies L. H. .

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