Multi-functionality and land use dynamics in a peri-urban environment influenced by wastewater irrigation

Jampani, Mahesh; Amerasinghe, Priyanie H.; Liedl, Rudolf; Locher-Krause, Karla E.; Hülsmann, Stephan

doi:10.1016/j.scs.2020.102305

Cited by 17 publications

(8 citation statements)

References 45 publications

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“…To compute RI, each metal's single pollution index (PI) was multiplied by its toxicity response coefficient, giving the single metal ecological risks, which were then summed into a single value (Equations 4 and 5). The toxicity response coefficient for RI defined by Hakanson (38) included As (10), Cd (30), Cr (2), Cu (5), Hg (40), Ni (5), Pb (5) and Zn (1). The ecological risk was estimated only for these elements.…”

Section: Potential Ecological Risk (E I R and Ri)mentioning

confidence: 99%

“…In Sub-Saharan Africa, Asia and Latin America, UPA is deeply embedded in citizens' livelihood and not only contributes substantially to urban diet diversification, but also represents an essential source of income for both local and international produce markets (4). However, urban and peri-urban agriculture in the developing world resides in a contrasted and sometimes illegal environment with substantial risks of pollution from domestic, urban and industrial waste and emissions (5,6). The expansion of urban areas and their fringes has been accompanied by intensive dissemination and accumulation of metal elements in soil and water bodies (7).…”

Section: Introductionmentioning

confidence: 99%

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Heavy metals and trace elements contamination risks in peri-urban agricultural soils in Nairobi city catchment, Kenya

et al. 2023

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IntroductionWith urbanization and industrialization in the developing world, urban and peri-urban agriculture is increasingly contributing to urban food systems, employment, and income generation opportunities. However, urbanization and industrialization may release harmful pollutants, including heavy metals and trace elements into agricultural soils, posing ecological, environmental and public health concerns. This paper assessed the potential risks of soil contamination with heavy metals and trace elements in peri-urban farmlands in Nairobi city catchment in Kenya. MethodsA total of 60 soil samples were collected from ten vegetable farming zones (S1-S10) and processed following standard protocols. The concentrations of As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, V and Zn were analyzed in the samples using inductively coupled plasma-mass spectrometry (ICP-MS). Results and discussionResults revealed that the soil samples have elevated concentrations of As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, V and Zn, with some elements including As (1.7%), Cd (13.3%), Mn (80%), Pb (1.7%) and Zn (11.7%) exceeding the permissible thresholds for agricultural soils. The spatial distribution of the elements exhibited three similar distribution patterns with slight variations between the hotspot sites of the different elements: (i) Co and Mn, (ii) Cu and Cr and (iii) As, Cd, Fe, Hg, Pb and Zn, while Ni and V exhibited singular spatial distributions compared to other elements. Elements such as As, Cd, Co, Fe, Hg, Mn, Pb and Zn appeared to be of anthropogenic enrichment, while Cr, Cu, Ni and V appeared to originate mainly from lithogenic and natural sources. The elements As, Cd, Hg and Pb exhibited high ecological risks, with Cd contributing about 46-66% of the overall ecological risk. The sampling sites S1, S5, S7, S9 and S10 depicted the highest ecological risks of 145, 103, 146, 121 and 146, respectively. The findings call for proper zoning of suitable agricultural areas and sound waste management protocols in urban and peri-urban landscapes. Further, remediation of contaminated soils and farmers’ sensitization are recommended for ecological and public health risk alleviation.

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Section: Potential Ecological Risk (E I R and Ri)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heavy metals and trace elements contamination risks in peri-urban agricultural soils in Nairobi city catchment, Kenya

et al. 2023

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“…Furthermore, the definition of peri-urban in the area of rice production centers can strengthen the concept that peri-urban agriculture can support the maintenance of ecosystem services in the region [56,57,58,59,60]. Ecosystem services are important because they increase the vulnerability of cities to climate change and provide benefits to urban residents [56,59,61,62].…”

Section: Overview Of Rice Fields Landscape In Peri-urban Krpcmentioning

confidence: 99%

Determining of peri-urban in rice production centers area: Case study in Karawang Regency, Indonesia

Mulya

2022

IOP Conf. Ser.: Earth Environ. Sci.

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In the last decade, the Jakarta-Bandung Mega Urban (JBMUR) corridor has experienced rapid urbanization, including the Karawang Regency. In addition, Karawang has become a national center (rice barn), with an area of rice fields in 2019 reaching 95,000 ha and covering 54% of its regency. The socio-economic spatial context of this region provides a new notion of peri-urban characteristics in the rice production center area. This study aims to identify the peri-urban areas and explain the peri-urban rice production center areas. The approach is a case study using geographic information system analysis (intersect, clip, feature to point) and data tabulation. The data are land cover time series maps from the Ministry of Environment and Forestry in 2019, village government maps (population and civil records 2019), and village potential data for 2011 and 2018. The analysis results show that the number of villages in the urban area is 49 villages, peri-urban 30 villages, and rural area 223 villages. Various variables were compared, showing urban area, peri-urban and rural area. Information on the characteristics of agricultural (rice field) centers can provide input for local governments in planning policy making.

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“…Many such endeavours have a short-term and flexible character, which triggers calls for an understanding of the spatial dynamics of irrigation. Although dynamics in the sense of land use changes are often analysed at a landscape level, the spatial trajectories of individual farmers are rarely empirically described in the literature (Campbell et al, 2005;Jampani et al, 2020). Understanding the spatial movements of individual farmers, and identifying who and what drives these movements shed new light on how to perceive and address sustainability concerns.…”

Section: Introductionmentioning

confidence: 99%

Security in flexibility: accessing land and water for irrigation in Kenya’s changing rural environment

Duker

Karimba

Wani³

et al. 2022

Cah. Agric.

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In the semi-arid lands of southern Kenya, a dynamic process of farmer-led irrigation has developed over the past two decades. It is characterised by short-term agreements to access land and water. Resident and migrant farmers, capital providers and local landowners have engaged in diverse partnerships to benefit from water and land along the Olkeriai sand river. This study aims to unravel which actors and motives drive the resulting highly dynamic forms of irrigation. Surveys, in-depth interviews and mapping exercises with farmers, capital providers and landowners were conducted over a period of 1.5 years. The results show that involved actors favour short-term lease and partnership arrangements and farmers frequently change fields along the river or leave the area and return. It is primarily the migrant farmers and capital providers who take decisions on when and where to move. They are informed by their experience with production factors, financial gains and losses, partner relations, or the ability to expand. We conclude that individualisation of land rights, migration, abundance of water, proximate markets, and rural-urban networks are instrumental to the emergence of this dynamic form of agriculture. Farmers have found a degree of security in flexibility, to access land and water in shifting fields and partners, rather than in property rights for specific plots. Yet, the short-term scope of these operations for monetary gains raises concerns about the sustainable use of land and water resources in the region.

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Multi-functionality and land use dynamics in a peri-urban environment influenced by wastewater irrigation

Cited by 17 publications

References 45 publications

Heavy metals and trace elements contamination risks in peri-urban agricultural soils in Nairobi city catchment, Kenya

Heavy metals and trace elements contamination risks in peri-urban agricultural soils in Nairobi city catchment, Kenya

Determining of peri-urban in rice production centers area: Case study in Karawang Regency, Indonesia

Security in flexibility: accessing land and water for irrigation in Kenya’s changing rural environment

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