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1

Comparison of the variation of soil respiration in carbon cycle in temperate and subtropical forests and the relationship with climatic variables

100%
Shi Z., Zhang Y., Chen B., Zhou W., Du E., Fang J.
Polish Journal of Ecology
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2015
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tom 63
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nr 3
Forest soil respiration (SR) has become a vital issue in global change ecology because of its critical role in global warming processes. However, SR remains the least understood component of the terrestrial carbon cycle because of its high spatial-temporal variability, inaccessibility of the soil substrate, and the high cost of measurement equipment. This study investigated the spatial and temporal variations of SR in six temperate and subtropical forest sites in eastern China. Seasonal variations of SR, the relationship between SR and soil temperature (ST) and volumetric water content (SW) were analyzed. Mean monthly SR varied seasonally and peaked in summer. SR varied temporally with ST (R² = 0.43∼0.79) in different sites and varied spatially with latitude (R² = 0.68). The responses of SR to the changes of SW varied across different sites and forest types. Their relationships were simulated by piecewise functions in the north three sites. The modules of ST and SW showed that ST is the dominant environmental factor in regulating seasonal dynamics of SR. This study is the first to examine the temporal and spatial variations of SR using a consistent method in situ in temperate and subtropical forests in eastern China. The results provide a scientific basis for accurately assessing future soil CO₂ efflux as a result of climate changes, and aid predictions of the changes of forest SR.
2

Uptake of manganese, zinc and copper by Hippuris vulgaris L. from wastewater solutions and soil substrate polluted with sewage sludge

100%
Galczynska M., Gibczynska M., Michalcewicz W., Malas A.
Zeszyty Naukowe Uniwersytetu Przyrodniczego we Wrocławiu. Rolnictwo
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2013
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tom 106
3
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Effect of soil substrate on the chemical composition of fruit of some tomato cultivars grown in an unheated plastic tunnel

100%
Majkowska-Gadomska J., Francke A., Wierzbicka B.
Journal of Elementology
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2008
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tom 13
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nr 2
The effect of cultivar and soil substrate on the chemical composition of tomato fruit was studied in an experiment conducted over the years 2004-2006 in an unheated plastic tunnel. The experimental materials comprised eight tomato cultivars: Atut F1, Baron F1, Bekas F1, Carmello F1, Gracja F1, Ognik F1, Słonka F1, Terra F1, as well as two types of soil: peat substrate purchas and hotbed soil. Tomato fruit was assayed for the content of: dry matter, L-ascorbic acid, total sugars, simple sugars, organic acids and nitrates. The levels of dry matter and L-ascorbic acid in tomato fruit were found to be significantly dependent on both the cultivar and the cultivar-substrate interaction. Cultivar Atut F1 had the lowest water content of fruit, while cv. Terra F1 was the richest source of L-ascorbic acid. The fruit of tomato cultivars grown in hotbed soil accumulated more dry matter. Hotbed soil, compared to peat substrate, had a more beneficial influence on the concentrations of sugars and nitrates in tomato fruit. The average N-NO3 content of the fruit of the investigated tomato cultivars was below the maximum permissible level, whose exceedance would pose a hazard to human health. The fruit of all tomato cultivars accumulated more nitrates when grown in peat substrate. The lowest nitrate content was recorded in cv. Bekas F1.
4

Przydatnosc gatunkow traw i surowcow odpadowych do rekultywacji hald popiolowo-zuzlowych

61%
Czyz H., Kitczak T.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2007
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tom 518
45-52
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