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Natural valorization of degraded swamp-originating meadows of Lower Silesia (extension of the Oswit method)

100%

Podlaska M.

Steciana

2014

tom 18

nr 3

Swamp-originating meadows constituting indirect habitats between living peatlands and classical grasslands may be difficult to evaluate. An indiscriminate application of the Oświt (2000) method for their valorization does not fully reflect their value, because of flora which is different from flora found in living peatlands (in particular, the invasion of less hygrophilous flora). Based on the research carried out in the years 2005–2010 on eight swamp-originating meadow complexes, the scale was elaborated which enabled to more accurately valorize these habitat and floristically changed areas. The quantities of valorization values obtained by use of the author’s method rely on the occurrence frequency of a given species (a number of posts in a given area), taking into consideration moisture requirements (the moisture indicator). In the author’s method values were also given for species not taken into account by Oświt (2000). In addition, positive points were given for dying out species, and negative points for invasive species.

Warming effects on plant growth, soil nutrients, microbial biomass and soil enzymes activities of two alpine meadows in Tibetan Plateau

67%

Li N., Wang G. X., Gao Y. H., Wang J. F.

Polish Journal of Ecology

2011

tom 59

nr 1

The aim of this study was to assess initial effects of warming on the plant growth, soil nutrient contents, microbial biomass and enzyme activities of two most widespread ecosystem types: swamp meadow (deep soil, high water content) and alpine meadow (poor soil, low water content), in the hinterland of the Qinghai-Tibet Plateau (altitude 4600–4800 m a.s.l.) The temperature of air and upper soil layer was passively enhanced using open-top chambers (OTCs) (50 cm high with 60 cm at opening and constructed of 6 mm thick translucent synthetic glass) from 2006 to 2008. The use of OTCs clearly raised temperature and decreased soil moisture. In warmed plots, monthly mean air temperature was increased by 2.10oC and 2.28oC, soil moisture of 20 cm soil layer was decreased by 2.5% and 3.9% in alpine meadow and swamp meadow, respectively. Plant biomass significantly increased by 31% in alpine meadow and 67% in swamp meadow. Warming also affected soil microbial biomass C and N at both meadows. In swamp meadow, warming caused the decrease of soil organic carbon and total nitrogen in 0–5 cm layer and an increase in 5–20 cm. While in alpine meadow, these soil parameters increased in 0–5 cm layer and decreased in 5–20 cm layer. The effects of warming on enzyme activities differed depending on the enzyme and the meadow ecosystem. In general, enzyme activities were higher in the upper soil layers (0–5 cm) than in the lower soil layers (5–20 cm). The experiment results exhibited that warming improved the soil biochemical and microbiological conditions in high- mountain meadows, at least in the short term.

Ograniczanie wyników

1 Polish Journal of Ecology

1 Steciana

1 Gao Y. H.

1 Li N.

1 Podlaska M.

1 Wang G. X.

1 Wang J. F.

1 2014

1 2011

Wyniki wyszukiwania

Natural valorization of degraded swamp-originating meadows of Lower Silesia (extension of the Oswit method)

Warming effects on plant growth, soil nutrients, microbial biomass and soil enzymes activities of two alpine meadows in Tibetan Plateau