This study evaluates pesticide contamination in groundwater downstream of the Kaddoussa Dam(Guir watershed,Morocco)and investigates the influence of agricultural activities on water quality.Nine sampling stations were...This study evaluates pesticide contamination in groundwater downstream of the Kaddoussa Dam(Guir watershed,Morocco)and investigates the influence of agricultural activities on water quality.Nine sampling stations were strategicallyselected during November 2023(post-agricultural season)to analyze spatial patterns of 18 pesticide residues:7 organophosphorusand 11 organochlorines.Identification and quantification were performed via gas chromatography method,targetingboth compound classes.Key findings reveal moderate yet localized contamination.The total concentration of organophosphoruspesticides(ΣPOPs)ranged from 0μg/L(S8)to 0.191μg/L(S4),with peak concentrations at stations S3(0.190μg/L)and S4(0.191μg/L),correlating spatially with intensive agricultural zones.Otherwise,the total concentration oforganochlorine pesticides(ΣPOCs)showed lower levels(0-0.060μg/L),with maxima at S4 linked to endosulfan and HCHisomers.Notably,none of the detected organochlorine concentrations exceeded 0.06μg/L,indicating relatively low levels ofcontamination.Central stations(S2-S6)exhibited co-occurrence of both pesticide groups,dominated by organophosphoruspesticides(0.135-0.191μg/L),while peripheral sites(S1,S7,S8,S9)displayed negligible or undetectable residues.Despitesub-regulatory thresholds,the persistent detection of pesticides underscores ecological and public health risks,particularlyin arid regions with heightened vulnerability due to limited healthcare access and water scarcity.Even at low concentrations,organophosphorus and organochlorine pesticides pose significant threats to aquatic ecosystems through bioaccumulation,while also presenting acute health risks to farmworkers and local communities dependent on contaminated groundwater.This study highlights the urgent need for integrated pesticide management strategies to mitigate long-term environmentaland socio-economic impacts in agriculturally intensive,water-stressed regions.展开更多
Identification of water potential areas in arid regions is a crucial element for the enhancement of their water resources and socio-economic development. In fact, water resources system-planning can be used to make va...Identification of water potential areas in arid regions is a crucial element for the enhancement of their water resources and socio-economic development. In fact, water resources system-planning can be used to make various decisions and implement manage- ment of water resources policies. The purpose of this study is to identify groundwater sto- rage areas in the high Guir Basin by implementing Geographic Information System (GIS) and Remote Sensing methods. The required data for this study can be summarized into five critical factors: Topography (slope), lithology, rainfall, rock fracture and drainage. These critical factors have been converted by the GIS into thematic maps. For each cri- tical parameter, a coefficient with weight was attributed according to its importance. The map of potential groundwater storage areas is obtained by adding the products (coeffi- cient × weight) of the five parameters. The results show that 50% to 64% of the total area of the High Guir Basin is potentially rich in groundwater, where most of fracture systems are intensely developed. The obtained results are validated with specific yield of the aqui- fer in the study area. It is noted that there is a strong positive correlation between excel- lent groundwater potential zones with high flows of water points and it diminishes with low specific yield with poor potential zones.展开更多
[Objectives]To further study the technology of short-cut flowering branches for Guire No.82 Mango,adjust its harvest time,increase yield and improve fruit quality,and increase the economic benefits of mango production...[Objectives]To further study the technology of short-cut flowering branches for Guire No.82 Mango,adjust its harvest time,increase yield and improve fruit quality,and increase the economic benefits of mango production.[Methods]The experiment of short-cut flowering branches was carried out for Guire No.82 Mango.[Results]At the initial flowering stage and full flowering stage of the primary inflorescence,with short-cut flowering branches and corresponding cultivation techniques,Guire No.82 Mango was easy to extract regenerated inflorescences.Compared with the control group,the flowering period of the regenerated inflorescences was delayed by 30-35 d and 40-50 d,respectively;the harvest time was delayed by 30 and 40 d,respectively;the yield significantly increased by 1.63 times and 2.25 times,respectively;compared with the control group,the number of fruits with embryo increased significantly,which were 1.39 and 2.25 times of the control,respectively;there was no significant difference in the fruit quality at the harvest time.[Conclusions]Short-cut flowering branches at the initial flowering stage and full flowering stage of the primary inflorescence is an effective measure to delay the marketing time of Guire No.82 Mango.展开更多
This study addresses the pressing need to evaluate the quality of water resources in the Oued Guir watershed,highlighting the importance of monitoring both surface water and groundwater in the context of environmental...This study addresses the pressing need to evaluate the quality of water resources in the Oued Guir watershed,highlighting the importance of monitoring both surface water and groundwater in the context of environmental and public health.It focuses on the evaluation of physicochemical and bacteriological water quality downstream of the Kaddoussa Dam,as well as the characterization of wastewater from the Boudnib treatment plant discharged into Oued Guir.The goal is to assess the health of aquatic ecosystems and understand the impact of anthropogenic activities on these sensitive environments.A comprehensive analysis was conducted at 15 selected stations during a sampling campaign in November 2023.Groundwater and surface water were assessed using 10 physicochemical parameters,while bacteriological quality was evaluated based on fecal coliforms and Escherichia coli.In addition,38 parameters were studied to characterize the wastewater discharge.All analyses followed standard procedures and the results were compared to Moroccan and World Health Organization(WHO)standards.The study revealed that surface water and groundwater in the study area exhibited strong mineralization,with Electrical Conductivity(EC)exceeding 1400µS/cm at all stations.Nitrogen quality,in terms of Nitrates(NO₃⁻),was moderate across stations,while Ammonium(NH₄⁺)quality was consistently excellent.Physicochemical parameters of surface waters indicated overall excellent quality.Bacteriological analysis showed minimal contamination by fecal coliforms and Escherichia coli,with levels deemed negligible.However,wastewater from the Boudnib treatment plant exceeded Moroccan standards for organic load,presenting a potential environmental risk.展开更多
文摘This study evaluates pesticide contamination in groundwater downstream of the Kaddoussa Dam(Guir watershed,Morocco)and investigates the influence of agricultural activities on water quality.Nine sampling stations were strategicallyselected during November 2023(post-agricultural season)to analyze spatial patterns of 18 pesticide residues:7 organophosphorusand 11 organochlorines.Identification and quantification were performed via gas chromatography method,targetingboth compound classes.Key findings reveal moderate yet localized contamination.The total concentration of organophosphoruspesticides(ΣPOPs)ranged from 0μg/L(S8)to 0.191μg/L(S4),with peak concentrations at stations S3(0.190μg/L)and S4(0.191μg/L),correlating spatially with intensive agricultural zones.Otherwise,the total concentration oforganochlorine pesticides(ΣPOCs)showed lower levels(0-0.060μg/L),with maxima at S4 linked to endosulfan and HCHisomers.Notably,none of the detected organochlorine concentrations exceeded 0.06μg/L,indicating relatively low levels ofcontamination.Central stations(S2-S6)exhibited co-occurrence of both pesticide groups,dominated by organophosphoruspesticides(0.135-0.191μg/L),while peripheral sites(S1,S7,S8,S9)displayed negligible or undetectable residues.Despitesub-regulatory thresholds,the persistent detection of pesticides underscores ecological and public health risks,particularlyin arid regions with heightened vulnerability due to limited healthcare access and water scarcity.Even at low concentrations,organophosphorus and organochlorine pesticides pose significant threats to aquatic ecosystems through bioaccumulation,while also presenting acute health risks to farmworkers and local communities dependent on contaminated groundwater.This study highlights the urgent need for integrated pesticide management strategies to mitigate long-term environmentaland socio-economic impacts in agriculturally intensive,water-stressed regions.
文摘Identification of water potential areas in arid regions is a crucial element for the enhancement of their water resources and socio-economic development. In fact, water resources system-planning can be used to make various decisions and implement manage- ment of water resources policies. The purpose of this study is to identify groundwater sto- rage areas in the high Guir Basin by implementing Geographic Information System (GIS) and Remote Sensing methods. The required data for this study can be summarized into five critical factors: Topography (slope), lithology, rainfall, rock fracture and drainage. These critical factors have been converted by the GIS into thematic maps. For each cri- tical parameter, a coefficient with weight was attributed according to its importance. The map of potential groundwater storage areas is obtained by adding the products (coeffi- cient × weight) of the five parameters. The results show that 50% to 64% of the total area of the High Guir Basin is potentially rich in groundwater, where most of fracture systems are intensely developed. The obtained results are validated with specific yield of the aqui- fer in the study area. It is noted that there is a strong positive correlation between excel- lent groundwater potential zones with high flows of water points and it diminishes with low specific yield with poor potential zones.
基金Supported by Project of Guangxi Science and Technology Program"Demonstration and Extension of Technology for Postponing Harvest time of Mango"(Gui Ke AB17292084)Agricultural Technology Research Project of Baise City。
文摘[Objectives]To further study the technology of short-cut flowering branches for Guire No.82 Mango,adjust its harvest time,increase yield and improve fruit quality,and increase the economic benefits of mango production.[Methods]The experiment of short-cut flowering branches was carried out for Guire No.82 Mango.[Results]At the initial flowering stage and full flowering stage of the primary inflorescence,with short-cut flowering branches and corresponding cultivation techniques,Guire No.82 Mango was easy to extract regenerated inflorescences.Compared with the control group,the flowering period of the regenerated inflorescences was delayed by 30-35 d and 40-50 d,respectively;the harvest time was delayed by 30 and 40 d,respectively;the yield significantly increased by 1.63 times and 2.25 times,respectively;compared with the control group,the number of fruits with embryo increased significantly,which were 1.39 and 2.25 times of the control,respectively;there was no significant difference in the fruit quality at the harvest time.[Conclusions]Short-cut flowering branches at the initial flowering stage and full flowering stage of the primary inflorescence is an effective measure to delay the marketing time of Guire No.82 Mango.
文摘This study addresses the pressing need to evaluate the quality of water resources in the Oued Guir watershed,highlighting the importance of monitoring both surface water and groundwater in the context of environmental and public health.It focuses on the evaluation of physicochemical and bacteriological water quality downstream of the Kaddoussa Dam,as well as the characterization of wastewater from the Boudnib treatment plant discharged into Oued Guir.The goal is to assess the health of aquatic ecosystems and understand the impact of anthropogenic activities on these sensitive environments.A comprehensive analysis was conducted at 15 selected stations during a sampling campaign in November 2023.Groundwater and surface water were assessed using 10 physicochemical parameters,while bacteriological quality was evaluated based on fecal coliforms and Escherichia coli.In addition,38 parameters were studied to characterize the wastewater discharge.All analyses followed standard procedures and the results were compared to Moroccan and World Health Organization(WHO)standards.The study revealed that surface water and groundwater in the study area exhibited strong mineralization,with Electrical Conductivity(EC)exceeding 1400µS/cm at all stations.Nitrogen quality,in terms of Nitrates(NO₃⁻),was moderate across stations,while Ammonium(NH₄⁺)quality was consistently excellent.Physicochemical parameters of surface waters indicated overall excellent quality.Bacteriological analysis showed minimal contamination by fecal coliforms and Escherichia coli,with levels deemed negligible.However,wastewater from the Boudnib treatment plant exceeded Moroccan standards for organic load,presenting a potential environmental risk.
