scholarly journals Soil nitrogen‐hydrolyzing enzyme activity and stoichiometry following a subtropical land use change

2021 ◽  
Author(s):  
Qian Zhang ◽  
Dandan Zhang ◽  
Junjun Wu ◽  
Jinsheng Li ◽  
Jiao Feng ◽  
...  
Keyword(s):  
Land Use ◽  
Enzyme Activity ◽  
Land Use Change ◽  
Soil Nitrogen

scholarly journals Soil nitrogen-hydrolyzing enzyme activity and stoichiometry following a subtropical land use change

2021 ◽  
Author(s):  
Qian Zhang ◽  
Dandan Zhang ◽  
Junjun Wu ◽  
Jinsheng Li ◽  
Jiao Feng ◽  
...  
Keyword(s):  
Land Use ◽  
Enzyme Activity ◽  
Land Use Change ◽  
Soil Nitrogen ◽  
Enzyme Activities ◽  
Specific Enzyme ◽  
Soil C ◽  
Soil C And N ◽  
C And N

Afforestation; Soil ecoenzymatic C: N: P; Specific enzyme activities; Soil C and N contents.

scholarly journals Land use change associated with urbanization modifies soil nitrogen cycling and increases N<sub>2</sub>O emissions

2016 ◽  
Author(s):  
Lona van Delden ◽  
David W. Rowlings ◽  
Clemens Scheer ◽  
Peter R. Grace
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Soil Nitrogen ◽  
Plant Cover ◽  
Ecosystem Dynamics ◽  
Automated System ◽  
N2o Emissions ◽  
Rain Event ◽  
Turf Grass ◽  
Significant Difference

Abstract. Urbanization is becoming increasingly important in terms of climate change and ecosystem functionality worldwide. We are only beginning to understand how the processes of urbanization influence ecosystem dynamics, making peri-urban environments more vulnerable to nutrient losses. Brisbane in South East Queensland has the most extensive urban sprawl of all Australian cities. This research estimates the environmental impact of land use change associated with urbanisation by examining soil nitrogen (N) turnover and subsequent nitrous oxide (N2O) emissions with a fully automated system that measured emissions on a sub-daily basis. There was no significant difference in soil N2O emissions between a native dry sclerophyll eucalypt forest and an extensively grazed pasture, wherefrom only low annual emissions were observed amounting to 0.1 and. 0.2 kg N2O ha−1 y−1, respectively. The establishment of a fertilised turf grass lawn increased soil N2O emissions by 18 fold (1.8 kg N2O ha−1 y−1) with highest emission occurring in the first 2 month after establishment. Once established, the turf grass lawn presented relatively low N2O emissions after fertilization and rain events for the rest of the year. Soil moisture was significantly higher and mineralised N accumulated in fallow land, resulting in highest N2O emissions (2.8 kg N2O ha−1 y−1) and significant nitrate (NO3−) losses of up to 63 kg N ha−1 from a single rain event due to plant cover removal. The study concludes that urbanization processes into peri-urban ecosystems can greatly modify N cycling and increase the potential for losses in form of N2O and NO3−.

scholarly journals Urbanisation-related land use change from forest and pasture into turf grass modifies soil nitrogen cycling and increases N<sub>2</sub>O emissions

2016 ◽  
Vol 13 (21) ◽  
pp. 6095-6106 ◽  
Author(s):  
Lona van Delden ◽  
David W. Rowlings ◽  
Clemens Scheer ◽  
Peter R. Grace
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Soil Nitrogen ◽  
Plant Cover ◽  
Ecosystem Dynamics ◽  
Automated System ◽  
N2o Emissions ◽  
Rain Event ◽  
Turf Grass ◽  
Significant Difference

Abstract. Urbanisation is becoming increasingly important in terms of climate change and ecosystem functionality worldwide. We are only beginning to understand how the processes of urbanisation influence ecosystem dynamics, making peri-urban environments more vulnerable to nutrient losses. Brisbane in South East Queensland has the most extensive urban sprawl of all Australian cities. This research estimated the environmental impact of land use change associated with urbanisation by examining soil nitrogen (N) turnover and subsequent nitrous oxide (N2O) emissions using a fully automated system that measured emissions on a sub-daily basis. There was no significant difference in soil N2O emissions between the native dry sclerophyll eucalypt forest and an extensively grazed pasture, wherefrom only low annual emissions were observed amounting to 0.1 and 0.2 kg N2O ha−1 yr−1, respectively. The establishment of a fertilised turf grass lawn increased soil N2O emissions 18-fold (1.8 kg N2O ha−1 yr−1), with highest emissions occurring in the first 2 months after establishment. Once established, the turf grass lawn presented relatively low N2O emissions for the rest of the year, even after fertilisation and rain events. Soil moisture was significantly higher, and mineralised N accumulated in the fallow plots, resulting in the highest N2O emissions (2.8 kg N2O ha−1 yr−1) and significant nitrate (NO3−) losses, with up to 63 kg N ha−1 lost from a single rain event due to reduced plant cover removal. The study concludes that urbanisation processes creating peri-urban ecosystems can greatly modify N cycling and increase the potential for losses in the form of N2O and NO3−.

Effects of land-use change from grassland to forest on soil sulfur and arylsulfatase activity in New Zealand

Soil Research ◽  
2001 ◽  
Vol 39 (4) ◽  
pp. 749 ◽  
Author(s):  
C. R. Chen ◽  
L. M. Condron ◽  
M. R. Davis ◽  
R. R. Sherlock
Keyword(s):  
Land Use ◽  
Enzyme Activity ◽  
Microbial Biomass ◽  
Land Use Change ◽  
Water Soluble ◽  
Microbial Biomass C ◽  
Organic S ◽  
Arylsulfatase Activity ◽  
Soil Sulfur ◽  
Effects Of Land Use

The effects of land-use change from grassland to forest on soil sulfur (S) and arylsulfatase enzyme activity were investigated by comparing soils under unimproved grassland and an adjacent 19-year-old exotic forest stand (mixture of Pinus ponderosa and P. nigra). Results showed that concentrations of organic S in topsoil under forest were significantly lower [418 µg/g (0–5 cm), 398 µg/g (5–10 cm)] than corresponding soil depths under grassland [541 µg/g (0–5 cm), 468 µg/g (5–10 cm)]. On the other hand, inorganic S concentrations were significantly higher in soil under forest at all depths compared with grassland. The inorganic S concentration in soil under grassland increased with depth, but there was no significant difference observed at different depths under forest. The decrease in organic S [and organic carbon (C)] in soil under forest was due to the enhanced mineralisation of organic components. The accumulation of inorganic S in the soil profile under forest was mainly attributed to enhanced mineralisation, although decreased leaching, increased sulfate-S adsorption, and increased atmospheric inputs by canopy interception of aerosols could have contributed. Microbial biomass C and S and arylsulfatase activity were higher in topsoil under grassland than forest. Lower arylsulfatase activities under forest compared with grassland at the time of sampling suggest that mineralisation of organic S under forest was not currently mediated primarily by enzyme activity, although enzyme activity may have been important at earlier stages of forest development. Arylsulfatase activity was significantly correlated with soil organic C, water-soluble C, microbial biomass C, total S, organic S, and microbial biomass S in soil under grassland and forest. Significant concentrations of organic S and microbial biomass S were present in the forest floor (litter and fermentation layers). These pools would be important for S cycling and availability in forest ecosystems. S mineralisation, S fractions, microbial biomass S, microbial biomass C.

Assessment of land-use change in coastal areas through geographical information systems

2020 ◽  
Vol 13 (10) ◽  
Author(s):  
Verónica Lango-Reynoso ◽  
Karla Teresa González-Figueroa ◽  
Fabiola Lango-Reynoso ◽  
María del Refugio Castañeda-Chávez ◽  
Jesús Montoya-Mendoza
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Geographical Information Systems ◽  
Design Methodology ◽  
Scientific Information ◽  
Coastal Ecosystems ◽  
Coastal Areas ◽  
Geographical Information ◽  
Coastal Zones ◽  
Computer Based

Objective: This article describes and analyzes the main concepts of coastal ecosystems, these as a result of research concerning land-use change assessments in coastal areas. Design/Methodology/Approach: Scientific articles were searched using keywords in English and Spanish. Articles regarding land-use change assessment in coastal areas were selected, discarding those that although being on coastal zones and geographic and soil identification did not use Geographic Information System (GIS). Results: A GIS is a computer-based tool for evaluating the land-use change in coastal areas by quantifying variations. It is analyzed through GIS and its contributions; highlighting its importance and constant monitoring. Limitations of the study/Implications: This research analyzes national and international scientific information, published from 2007 to 2019, regarding the land-use change in coastal areas quantified with the digital GIS tool. Findings/Conclusions: GIS are useful tools in the identification and quantitative evaluation of changes in land-use in coastal ecosystems; which require constant evaluation due to their high dynamism.

Monitoring land use change in the Lake Taupo catchment between 1975, 1990 and 2002 using satellite remote sensing data

2007 ◽  
pp. 17-22
Author(s):  
H. Lilienthal ◽  
A. Brauer ◽  
K. Betteridge ◽  
E. Schnug
Keyword(s):  
Remote Sensing ◽  
Water Quality ◽  
Land Use ◽  
Land Use Change ◽  
Satellite Remote Sensing ◽  
Remote Sensing Data ◽  
Native Vegetation ◽  
Lake Water Quality ◽  
Livestock Farming ◽  
Slow Decline

Conversion of native vegetation into farmed grassland in the Lake Taupo catchment commenced in the late 1950s. The lake's iconic value is being threatened by the slow decline in lake water quality that has become apparent since the 1970s. Keywords: satellite remote sensing, nitrate leaching, land use change, livestock farming, land management

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