Wyniki wyszukiwania

1

Effects of CO2 fumigation and nitrogen addition on soil respiration in a wetland ecosystem: experimental approach with top open chambers

100%

Wang J., Fu X., Wang J., Zhong H., Zhang R., Ni H.

Polish Journal of Ecology

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2018

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tom 66

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nr 2

Soil respiration plays a crucial role in global carbon cycling of terrestrial ecosystems. Changes in atmospheric CO₂ and nitrogen (N) addition across the globe are likely to affect soil respiration. However, the effects of elevated CO₂, and N addition on soil respiration are not fully understood especially in wetland ecosystems. To evaluate the effects of atmospheric CO₂ and N availability on soil respiration, a paired, nested manipulative in situ experiment was performed, using CO₂ fumigation within Open-Top Chambers as the primary factor, and N (as NH₄NO₃) as the secondary factor in a temperate wetland in northeastern China in 2010 and 2011. CO₂ fumigation significantly enhanced soil respiration, according to repeated-measures ANOVA, and the stimulatory effect of CO₂ fumigation on soil respiration was sustained during the whole experimental period regardless of N addition. However, the positive soil respiration effect of N addition alone weakened over time. Moreover, there was a significant interaction between CO₂ fumigation and N addition. Soil temperature explained 50–66% of the variation in soil respiration. Moreover, soil respiration was positively correlated with the root N content and litter decomposition rate. The results suggested that elevated CO₂ concentrations will accelerate soil respiration and ecosystem carbon cycling, thus, limiting soil carbon sequestration, especially when coupled with increasing N deposition.

2

Diversity and composition of wetland communities along an agricultural drainage ditch density gradient

84%

LU T., Ma K., FU B., Zhang J., Lu Q., Hudson S.

Polish Journal of Ecology

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2009

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tom 57

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nr 1

113-123

Agricultural drainage ditches are a reflection of the disturbance caused by agriculture and other human perturbations associated with agricultural activities, and the density of them can be seen as an important gradient reflecting local disturbance. However, no studies to date have examined the changes in wetland communities in relation to drainage ditch densities, yet such information is urgently needed for the conservation of wetland ecosystems facing intensive cultivation. In this paper, we inventoried 67 plots at four wetland mosaics with the ditch density values ranged 0–3.6 km km⁻² in the Sanjiang Plain, and the species richness, composition and diversity were compared among those four sites. Linear regression was used to explore relationships between wetland community pattern and agricultural ditch density, and the results show that there is significant relationship (r² = 0.56, P <0.001). The diversity comparisons show that there exist a clear negative relationship between ditch density and species diversity indices, and the species diversity did not differ greatly among sites, but species composition varied considerably. With increasing ditch density, an increasing loss of indigenous wetland species paralleled with an increasing incursion of upland species. Management implication from the drainage ditches is that the density of 1.2 km km⁻² be the maximum value suitable for the protection of native wetlands in Sanjiang plain.

3

Public perceptions of papyrus: community appraisal of wetland ecosystem services at Lake Naivasha, Kenya

84%

Morrison E. H. J., Upton C., Pacini N., Odhiambo-K'oyooh K., Harper D. M.

International Journal of Ecohydrology and Hydrobiology

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2013

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tom 13

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nr 2

4

Aquatic plants and rush-plants of the upper Vereshitsa River valley in the region of Lvov Roztocze

84%

Swies F., Soroka M.

Annales Universitatis Mariae Curie-Sklodowska. Sectio C, Biologia

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2000

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tom 55

5

Composition and density of plant-associated invertebrates in relation to environmental gradients and hydrological connectivity of wetlands

67%

Obolewski K.

Oceanological and Hydrobiological Studies

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2011

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tom 40

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nr 4

6

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Analysis of the removal of BOD5, COD and suspended solids in subsurface flow constructed wetland in Latvia

67%

Grinberga L., Grabuza D., Grinfelde I., Lauva D., Celms A., Sas W., Gluchowski A., Dzieciol J.

Acta Scientiarum Polonorum. Architectura

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2021

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tom 20

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nr 4

7

Nutrients availability and hydrological conditions of selected wetland ecosystems in the Biebrza river valley

67%

Stelmaszczyk M., Okruszko T., Meire P.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2015

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tom 47

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nr 1

Nutrients availability and hydrological conditions of selected wetland ecosystems in the Biebrza river valley. Paper presents results of investigation of hydrological conditions and nutrients limitation and availability for wetland vegetation in selected sites within Biebrza river valley. Analysed sites were overgrown by tall sedge Magnocaricion vegetation (Caricetum gracilis and Caricetum elatae), wet meadow Molinio-Arrhenatheretea vegetation (Molinietum caeruleae), and sedge-moss Scheuchzerio-Caricetea nigrae vegetation (Caricetum lasiocarpae). There were noted a close relationship between vegetation types, hydrological regimes and kind of nutrient limitation. Low productive Molinio-Arrhenatheretea and Scheuchzerio-Caricetea nigrae vegetations fed mainly by groundwater were limited by phosphorus, while highly productive Magnocaricion vegetation, fed by river water, was subjected to nitrogen limitation. We have found big diversifi cation of groundwater and surface water levels within habitats of different vegetation types along the Biebrza river valley. Magnocaricion vegetation present on fl ooded areas is characterized by signifi cant water level fl uctuations and long-lasting inundations. On areas covered by Molinio- -Arrhenatheretea vegetation we noted majority of water levels not exceeding the level of the ground surface. Whereas Scheuchzerio-Caricetea nigrae vegetation, fed by groundwater, is characterized by low variation of groundwater levels.

Ograniczanie wyników

Effects of CO2 fumigation and nitrogen addition on soil respiration in a wetland ecosystem: experimental approach with top open chambers

Diversity and composition of wetland communities along an agricultural drainage ditch density gradient

Public perceptions of papyrus: community appraisal of wetland ecosystem services at Lake Naivasha, Kenya

Aquatic plants and rush-plants of the upper Vereshitsa River valley in the region of Lvov Roztocze

Composition and density of plant-associated invertebrates in relation to environmental gradients and hydrological connectivity of wetlands

Analysis of the removal of BOD5, COD and suspended solids in subsurface flow constructed wetland in Latvia

Nutrients availability and hydrological conditions of selected wetland ecosystems in the Biebrza river valley