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1

Responses of soil beta-glucosidase activities to simulated increased precipitation in a semi-arid temperate grasslands

100%
Rui X., Liang D.
Polish Journal of Ecology
|
2013
|
tom 61
|
nr 2
In concurrent with global warming, precipitation regimes are predicted to change as well around the world. In this study, two experimental sites were selected with different nutrient availability along a slope to study the effects of simulated increased precipitation on soil β-glucosidase activities in an Inner Mongolian grassland. Soil samples were adjusted to 55% of water holding capacity and incubated at 22°C in the dark for 32 days. Soil β-glucosidase activities were measured prior to and after the incubation. Results showed that soil β-glucosidase activities had differential responses to increased precipitation with a significant increase in the downslope site, but not in the upslope site. Correlation analysis showed that the initial soil β-glucosidase activities exerted a significantly negative relationship with soluble organic nitrogen (N). Our results indicated that both water availability and soil soluble N availability played important roles in regulating β-glucosidase activities in this semiarid region.
2

Responses of physiological characteristics of annual C4 herbs to precipitation and wind changes in semi-arid sandy grassland, Northern China

84%
Sun S., Liu X., He Y., Lv P., Chelmeg, Zhang L., Wei S.
Polish Journal of Ecology
|
2020
|
tom 68
|
nr 2
3

Fractal features of soil particle size distributions and their implications for indicating enclosure management in a semiarid grassland ecosystem

84%
Chen W., Chang H., Liu R.
Polish Journal of Ecology
|
2020
|
tom 68
|
nr 2
4

Effect of 5 years long cessation of grazing on methane uptake in a semi-arid grassland

67%
Zhou X., Hao Y.
Polish Journal of Ecology
|
2010
|
tom 58
|
nr 4
Grazing exerts a key role in nutrient cycling in grassland ecosystems, however, little is known about the effe cts of short-term enclosure on methane (CH₄) fluxes in a semi-arid steppe biome like this of Inner Mongolia. CH₄ fluxes were measured in the Leymus chinensis (Trin) Tzvel. grassland using static chamber and gas chromatography (GC). Measurements were carried out twice per month over a growing season in 2004 at the two sites (one fenced since 1999 (UG99) and the other subjected to freely grazing (FG)). All CH₄ fluxes were positive, indicating that this grassland functioned as the active atmospheric CH₄ uptakes. During this period, the UG99 site (57.6 ± 6.7 μg C m⁻² h⁻¹) had significantly higher mean CH₄ uptake in comparison to the FG site (37.0 ± 6.3 μg C m⁻² h⁻¹). A significant liner negative correlations between CH₄ uptake and soil moisture (0–5 cm) at the both sites were found (P <0.05). The results indicated that short-term enclosure was helpful to improve CH₄ uptake in this area.
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