Multiple metals and agricultural use affects oxidative stress biomarkers in freshwater Aegla crabs

Abstract Metals and agrochemicals are among the main aquatic contaminants, being able to trigger oxidative stress in exposed organisms. The objective of this work was to evaluate the correlation between the level of oxidative stress biomarkers in Aegla crabs (Crustacea, Anomura) with (i) the set of metals present in the streams sediment and (ii) with land uses of three hydrographic basins. The study was carried out in streams (≤ 2nd order) of hydrographic basins in southern Brazil (Basins of Rio Suzana, Rio Ligeirinho-Leãozinho and Rio Dourado). In these streams were quantified the land uses and Cu, Cr, Cd, Fe, Mn and Zn concentrations in the sediment. The enzymes Catalase (CAT) and Glutathione Reductase (GR), as well as the level of membrane lipid peroxidation (TBARS), were analyzed in adult females. The PCA analysis showed that the distribution of metals was different between the basins. Cd, Cr and Fe were correlated positively with CAT and negatively with TBARS and GR. The Dourado basin had the lowest concentrations of these three metals and the highest levels of TBARS. However, in Dourado basin there is predominance of agriculture land use, and TBARS was positively correlated with agricultural land use. Besides in Dourado basin, GR activity was higher than in the others basins, indicating a compensatory response in relation to CAT inhibition. The basins of Suzana and Ligeirinho-Leãozinho rivers had lower TBARS values, which may be due to the induction of CAT in response to metals accumulated in sediment. In summary, this work indicates that in the basins with a higher concentration of toxic metals there is an adaptive response of CAT induction, which reduces TBARS in Aegla. On the other hand, in the basin with lower metallic contamination, TBARS occurrence was primarily influenced by agricultural land use.

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Changes in Coastal Agricultural Land Use in Response to Climate Change: An Assessment Using Satellite Remote Sensing and Household Survey Data in Tien Hai District, Thai Binh Province, Vietnam

Land ◽

10.3390/land10060627 ◽

2021 ◽

Vol 10 (6) ◽

pp. 627

Author(s):

Duong H. Nong ◽

An T. Ngo ◽

Hoa P. T. Nguyen ◽

Thuy T. Nguyen ◽

Lan T. Nguyen ◽

...

Keyword(s):

Climate Change ◽

Land Use ◽

Agricultural Land ◽

Land Use Changes ◽

Management Strategies ◽

Household Survey ◽

Extreme Weather Events ◽

Agricultural Land Use ◽

Landsat 8 ◽

Land Uses

We analyzed the agricultural land-use changes in the coastal areas of Tien Hai district, Thai Binh province, in 2005, 2010, 2015, and 2020, using Landsat 5 and Landsat 8 data. We used the object-oriented classification method with the maximum likelihood algorithm to classify six types of land uses. The series of land-use maps we produced had an overall accuracy of more than 80%. We then conducted a spatial analysis of the 5-year land-use change using ArcGIS software. In addition, we surveyed 150 farm households using a structured questionnaire regarding the impacts of climate change on agricultural productivity and land uses, as well as farmers’ adaptation and responses. The results showed that from 2005 to 2020, cropland decreased, while aquaculture land and forest land increased. We observed that the most remarkable decreases were in the area of rice (485.58 ha), the area of perennial crops (109.7 ha), and the area of non-agricultural land (747.35 ha). The area of land used for aquaculture and forest increased by 566.88 ha and 772.60 ha, respectively. We found that the manifestations of climate change, such as extreme weather events, saltwater intrusion, drought, and floods, have had a profound impact on agricultural production and land uses in the district, especially for annual crops and aquaculture. The results provide useful information for state authorities to design land-management strategies and solutions that are economic and effective in adapting to climate change.

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Effects of intensive agriculture and hydrological changes on macrophyte and macroinvertebrate assemblages in lowland riverine wetlands

10.21203/rs.3.rs-965908/v1 ◽

2021 ◽

Author(s):

Paula Altieri ◽

Carolina Ocon ◽

Roberto Jensen ◽

Alberto Rodrigues Capítulo

Keyword(s):

Land Use ◽

Agricultural Land ◽

Nutrient Concentrations ◽

Agricultural Land Use ◽

Total Density ◽

Land Uses ◽

Dry Period ◽

Riverine Wetlands ◽

Macroinvertebrate Assemblages ◽

Agricultural Wetlands

Abstract The aim of this study was to investigate the effects of agricultural land use and periods of hydrological variability on the environmental variables, as well as macrophyte and macroinvertebrate assemblages in lowland riverine wetlands. We compared two wetlands with intensive agricultural land use against two others with extensive livestock considered references for the region during a normal and a dry flow period. Nutrient concentrations were significantly higher in agricultural riverine wetlands. These wetlands exhibited higher relative coverage of floating anchored macrophytes and the absence of submerged vegetation. They showed significantly lower taxonomic richness and density of macroinvertebrates and a higher relative abundance of scrapers and predators. Wetlands of both land uses had a lower total density of macroinvertebrates and a higher proportion of tolerant desiccation taxa in the dry period. Particular differences between land uses, such as lower dissolved oxygen concentrations and lower macroinvertebrate diversity in agricultural wetlands, were found during the dry period. These findings indicate that the differences between land uses increased during the aforementioned period. This study provides evidence of the effects of the surrounding landscape and hydrologic periods in the environmental characteristics as well as the macrophyte and macroinvertebrate assemblages of the riverine wetlands studied.

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The purpose of modem land management in the organization of agricultural land use for sustainable socio-ecological and economic development

E3S Web of Conferences ◽

10.1051/e3sconf/202125803005 ◽

2021 ◽

Vol 258 ◽

pp. 03005

Author(s):

Marina Podkovyrova ◽

Dmitriy Kucherov

Keyword(s):

Land Use ◽

Land Management ◽

Agricultural Land ◽

Laws Of Nature ◽

Nature Management ◽

Agricultural Land Use ◽

Land Uses ◽

Full Compliance ◽

Production Factors ◽

Management Project

The authors examined the key components of In moden post – reform conditions when the organization of the use of agricultural land is carried out without land management project documentation and relevant recommendations, in conditions of significant pressure from industrial and urban development, this is primarily the main reason for the decline in soil fertility and the development of degradation processes, a departure from the classical sustainable agricultural land use, formed on the principles of land management and the laws of nature management [1- 4]. In the process of functioning, once-stable land uses have not changed borders for decades, which indicates a rational overall size of agricultural land use, when all three production factors: “labor”, “land” and “capital” are in full compliance with each of them, that is, harmonization, rationalization and greening [5, 6]. This harmonization eliminates the presence of such disadvantages as: far-earth, cross-stripe, wedging, etc., creates conditions for the rationai organization of the use of agricultural land [2, 5, 6].

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A STUDY OF RELATIONSHIPS BETWEEN SOIL SURVEY DATA AND AGRICULTURAL LAND USE USING INFORMATION THEORY

Canadian Journal of Soil Science ◽

10.4141/cjss87-009 ◽

1987 ◽

Vol 67 (1) ◽

pp. 95-102 ◽

Cited By ~ 4

Author(s):

J. DUMANSKI ◽

M. PHIPPS ◽

E. HUFFMAN

Keyword(s):

Information Theory ◽

Land Use ◽

Agricultural Land ◽

Spatial Interaction ◽

Soil Survey ◽

Agricultural Land Use ◽

Land Use Intensity ◽

Land Uses ◽

Sources Of Information ◽

Survey Statistics

The significant advances which have been made on inventories of agricultural land use and in updating soil survey information provide an opportunity to compare these new sources of information to identify which of the various land factors shown on soil survey maps correlate most closely with agricultural land use. Three study areas representing three levels of land use intensity were used. Statistics of information theory were evaluated for application in studies of this type. Results demonstrate that a statistically significant correlation (adjustment) between physical land conditions and land use has occurred in all three areas. However, the degree of correlation varied according to the land use and the types of land factors considered. Increased correlation was achieved when land uses were weighted by economic investment. The factor called "soil association" was identified as correlating best with land use, but factors such as surface texture, capability class, slope and "spatial interaction" were also significant. Key words: Land use, soil survey, statistics, information theory, capability, economic investment

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Agricultural land use curbs exotic invasion but sustains native plant diversity at intermediate levels

Scientific Reports ◽

10.1038/s41598-021-87806-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

E. Pellegrini ◽

M. Buccheri ◽

F. Martini ◽

F. Boscutti

Keyword(s):

Land Use ◽

Species Richness ◽

Exotic Species ◽

Plant Invasion ◽

Agricultural Land ◽

Agricultural Land Use ◽

Exotic Plant ◽

Land Uses ◽

Native Plant ◽

Native Plant Diversity

AbstractUnveiling the processes driving exotic plant invasion represent a central issue in taking decisions aimed at constraining the loss of biodiversity and related ecosystem services. The invasion success is often linked to anthropogenic land uses and warming due to climate change. We studied the responses of native versus casual and naturalised exotic species richness to land uses and climate at the landscape level, relying on a large floristic survey undertaken in North - Eastern Italy. Both climate and land use drove exotic species richness. Our results suggest that the success of plant invasion at this scale is mainly due to warm climatic conditions and the extent of urban and agricultural land, but with different effects on casual and naturalized exotic species. The occurrence of non-linear trends showed that a small percentage of extensive agricultural land in the landscape may concurrently reduce the number of exotic plant while sustaining native plant diversity. Plant invasion could be potentially limited by land management, mainly focusing on areas with extensive agricultural land use. A more consciousness land management is more and more commonly required by local administrations. According to our results, a shift of intensive to extensive agricultural land, by implementing green infrastructures, seems to be a win–win solution favouring native species while controlling the oversimplification of the flora due to plant invasion.

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Assessment of Soil Quality under Different Agricultural Land Use Systems: A Case Study of the Ibadan Farm Settlement

International Journal of Plant & Soil Science ◽

10.9734/ijpss/2020/v32i430275 ◽

2020 ◽

pp. 89-104

Author(s):

B. O. Adebo ◽

A. O. Aweto ◽

K. Ogedengbe

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Soil Quality ◽

Management Practices ◽

Agricultural Land ◽

Agricultural Land Use ◽

Land Uses ◽

Native Land ◽

Land Use Systems

Soil quality in an agroecosytem is considerably influenced by land use and management practices. Twenty two potential soil quality indicators were used to assess the effects of five different land use types (arable land, plantation, agroforestry, marginal land and native forest) on soil quality in Akufo and Atan farm settlements in Ibadan, southwestern Nigeria. A total of sixty-two fields were selected from which soil samples were taken at a depth of 0-15 cm and subjected to laboratory analysis. Majority of the evaluated physicochemical properties varied significantly among the land uses and whereas native land performed relatively better for most of the observed attributes, arable and marginal lands performed worse. Due to the moderate to strong significant correlation among the potential indicators, they were subjected to principal component analysis and only seven indicators were selected to compute the soil quality index (SQI). In both Akufo and Atan, native land had the highest SQI (0.8250 and 0.860 respectively) which was significantly different (P = .05) from all the agricultural land uses, except plantation (0.739 and 0.750 respectively). Whereas marginal field in Atan was most degraded (SQI = 0.455), it was closely followed by arable fields in both locations. This study indicates that the current agricultural land use and soil management practices in Akufo and Atan farm settlements have negatively impacted soil quality; however, the degree of degradation was strongly influenced by the concentration of soil organic carbon in the understudied land use systems. It also emphasizes the need to promote the use of sustainable management practices among agricultural land users, so as to increase soil organic carbon stock, and improve soil quality and land productivity.

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Perspectives on Agricultural Land Use Conversion and Food Security in Rural Ghana

Sci ◽

10.3390/sci1010014.v1 ◽

2019 ◽

Vol 1 (1) ◽

pp. 14 ◽

Cited By ~ 3

Author(s):

Divine Odame Appiah ◽

Felix Asante ◽

Bernice Nketiah

Keyword(s):

Land Use ◽

Quantitative Methods ◽

Agricultural Land ◽

Agricultural Land Use ◽

Land Uses ◽

Agricultural Lands ◽

Chi Square ◽

Qualitative And Quantitative Methods ◽

Planning Department ◽

Increasing Demand

Rapid peri-urbanization has resulted in increasing demand for and pressure on peri-urban lands at the expense of agricultural lands. Households’ decision to convert from agricultural land uses to residential and commercial land uses is driven by a myriad of factors, ranging from social to economic, in the Asante-Akim South district of the Asante region, Ghana. The paper examined the effects of agricultural land use trade-off on food production in the district. Using a triangulation of qualitative and quantitative methods, 115 household respondents were proportionately sampled from three selected communities in the district, for the collection of data through the administration of questionnaires. The data were subjected to the Pearson’s chi-square, embedded in the SPSS V.16, to test for association among the variables. We report that the increasing rate of agricultural land uses conversions was as a result of increasing demand for residential and commercial land usage at the expense of agricultural land uses. Converting prime agricultural lands into other land uses was seen as profitable to agricultural expansion. A re-examination of the district land use plans by the Ghanaian Physical (Town and Country) Planning Department in tandem with the Lands Commission is therefore recommended.

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