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Studying soil salinity and its relations with microtopography and vegetation at field scale

100%

Zhao C.-W., Xu L., Wang Z.-C., Wang Y.-H., Chi C.-M.

Polish Journal of Environmental Studies

2013

tom 22

nr 4

Spatial variation of soil salinity and sodicity is a typical characteristic of Songnen Plain grasslands in northeast China. Best management practices and grassland productivity improvement require further understanding of the relationships among the causal factors at field scale. A field soil survey for the interactions among salinity, microtopography, and vegetation was conducted on a 2.8 hectare saline sodic grassland at Da’an Sodic Land Experimental Station, Chinese Academy of Sciences, northeast China. Salinity of the soil decreases by depth increment with Na+ and HCO-3 as the dominant ions. Soil salinity and sodicity parameters measured include pH, electrical conductivity for 1 to 5 soil-water extracts (EC1:5), apparent electrical conductivity (ECa), sodium adsorption ratio, and exchangeable sodium percentage. Soil salinity is in an order of slope > mound > depression for microtopography and soil under S. corniculata community is in severe salinity, while there is no significant difference under P. australis-A. mongolica and P. australis communities. The water and salt regime in various microtopographical conditions also is discussed.

Spatial variability of soil dehydrogenases and cellulases activities in a field scale

67%

Smolinski S., Dlugosz J., Piotrowska A., Zamorski R.

Polish Journal of Soil Science

2008

tom 41

nr 1

73-80

Spatial field-scale variability of soil dehydrogenases and cellulases activities and their relationship with organic carbon and total nitrogen content at the surface horizon of eutric, gleic Cambisols of the field, under winter wheat localised in the southern part of the Sępopolska Plain was assessed. Twenty soil samples were collected in September in the system defined by the method of diffused points localised by GPS. The activity of dehydrogenases ranged between 0.8-1.55 µM TPF g⁻¹ DM 24 h⁻¹, while cellulolytic activity ranged between 0.2-1.0 µM glucose g⁻¹ DM h⁻¹ x 10⁻³. A high nugget effect observed for both enzymatic activities was probably caused by a nest (local) occurrence of the enzymes, especially dehydrogenase. No statistically significant correlation coefficients were calculated for the relationship between the enzymatic activities and Corg, Ntot and clay fraction content.

Ograniczanie wyników

1 Polish Journal of Environmental Studies

1 Polish Journal of Soil Science

1 Chi C.-M.

1 Dlugosz J.

1 Piotrowska A.

1 Smolinski S.

1 Wang Y.-H.

1 Wang Z.-C.

1 Xu L.

1 Zamorski R.

1 Zhao C.-W.

1 2013

1 2008

Wyniki wyszukiwania

Studying soil salinity and its relations with microtopography and vegetation at field scale

Spatial variability of soil dehydrogenases and cellulases activities in a field scale