DESERTNET MONITORING AND ACTIONS TO COMBAT DESERTIFICATION IN THE MEDITERRANEAN EUROPEAN REGION. Región de Murcia. Spain. Dra. Carmen Pérez Sirvent
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1 DESERTNET INTERREG III B ESPACIO MEDOC FEDER MONITORING AND ACTIONS TO COMBAT DESERTIFICATION IN THE MEDITERRANEAN EUROPEAN REGION Región de Murcia Spain Dra. Carmen Pérez Sirvent Comunidad Autónoma de la Región de Murcia Profesora Titular de la Universidad de Murcia Universidad de Murcia
2 OBJECTIVES To extend desertification studies to factors that haven t been treated enough, such as chemical degradation of soils. Procceses Processes affecting degradation of soil Physical Chemical Biological To obtain information and elaborate indicators related to changes in land uses and its management in the four pilot areas selected. To distinguish between natural and anthropogenic factors, with the purpose of suggesting action and remediation plans in addition to good management practices that can be included in agricultural and environmental policy. Salinization Loss of fertility DESERNET REGIÓN DE MURCIA Alcalinization Increase in metals mobility Phytotoxicity Fitotoxicity Food chain Health problems
3 METHODOLOGY Soil sampling Design of sampling Square plot (3x3 km) GPS 5 superficial samples (0 25 cm) Mixing and homogeneization Representative sample of sampling point LABORATORY
4 METHODOLOGY PLANT- AVAILABLE METALS DETERMINATION (DTPA, Lindsay and Norvell, 1978) Micronutrient metals: Zn, Cu, Fe y Mn Phytotoxic metals: Pb y Cd ph, 1:1 extracts Peech s Method (1965) SAMPLES Fraction <2mm AIR DRIED (0-25 cm) EC, saturation extract (Rhoades, 1982) Soluble salts (IC) SAR MINERALOGICAL COMPOSITION (XRD) STATISTICAL ANALYSIS OF RESULTS GIS METHODOLOGY
5 MONITORING METHODOLOGY MONITORED AREA ENVIRONMENTAL STUDY PERIODIC SOIL SAMPLING LAND USES DATA BASE GIS INDEX SPATIO-TEMPORAL INFORMATION PROPOSAL OF ACTIONS
6 Sampling points location map Vega Alta Vega Media Valle Guadalentín Campo Cartagena
7 Campo de Cartagena: 84 samples One of the most important agricultural areas in the Región of Murcia, with a highly productive irrigated agriculture and metal-mining influence. No salinization problems due to parent material.
8 Valle del Guadalentín: 73 samples Alluvial soils in the Guadalentin River Basin, with historical irrigation systems, at present coexisting with a highly productive irrigated agriculture. Salinization problems, mainly due to natural factors although human actions have influenced the proccess.
9 Vega Alta: 26 samples Alluvial soils where intensive agriculture is practiced, but not affected by salinization and contamination.
10 Vega Media: 22 samples Alluvial soils in the Segura Basin that have long been dedicated to growing a variety of crops. During recent years, however, they have suffered a number of impacts from various sectors including urban expansion, intensification of agriculture practices and the use of poor quality irrigation water.
11 Monthly rainfall average ( ) 45,0 CLIMATIC CONDITIONS ºC l/m2 40,0 35,0 30,0 25,0 20,0 15,0 10,0 5,0 0,0 Jan Feb Ma Ap May Jun Jul Aug Sep Oct Nov Dec Campo Cartagena Vega Media Valle del Guadalentin Vega alta Semiaridic Mediterranean climate R<350 l/m 2 T m = 16-19ºC Anual average temperature evolution ( ) 19,5 19,0 18,5 18,0 17,5 17,0 16,5 16,0 15, Campo de Cartagena Vega Media Valle del Rio Guadalentin Vega alta
12 DATA BASE 50 MAPS Mineralogical composition land use ph EC SAR Fe Cu Mn Zn Pb Cd
13 DATA BASE Land uses map in the four pilot areas Usos del suelo Land uses. Total of samples = 205 Vega Alta 18% 33% Go teo Ma nta Vega Media 19% 30% Secano Otros Valle Guadalentín Campo Cartagena
14 DATA BASE Mineralogical composition map in the four pilot areas Vega Alta 14% 3% Mineralogía Mineralogical composition. Total of Samples = 205 GRUPO 1 Vega Media GRUPO 2 18% 65% GRUPO 3 GRUPO 4 Valle Guadalentín Campo Cartagena
15 ph distribution map DATA BASE EC distribution map SAR distribution map
16 DATA BASE Plant-available Cu distribution map Plant-available Fe distribution map Plant-available Zn distribution map Plant-available Mn distribution map
17 DATA BASE Plant-available Pb distribution map Plant-available Cd distribution map
18 DEFINED INDICATORS: State of salinization (four pilot areas). Rate of salinization (four pilot areas). State of alcalinization (Vega Media). Rate of alcalinization (Vega Media). Loss of fertility: loss of micronutrient metals Fe, Cu, Mn and Zn (Vega Media). Risk of phytotoxicity: Increase of plant-available Pb andcd(vega Media). 21 MAPS
19 STATE OF SALINIZATION INDICATOR: Slight, moderate, high, very high Objective: Quantitative control of soluble salts in soil by EC values obtained from saturation extract, which reflects an edaphic process that can be due to natural and/or anthropogenic causes. Method: EC measurement in saturation extracts obtained from a soil paste saturated with deionized water. Units: ds m -1
20 RATE OF SALINIZATION INDICATOR: Negative, slight, moderate, severe, very severe Objective: Quantitative control of soluble salts variation in soil for a period of time, which reflects an edaphic proccess that can be due to natural and/or anthropogenic causes. Method: Diference of EC values in saturation extracts divided by the number of years in the period of time. Units: ds m -1 year -1
21 STATE OF ALCALINIZATION INDICATOR: Slight, moderate, high, very high Objective: Quantitative control of the presence of sodium in soil by SAR values obtained from saturation extract, which reflects an edaphic process that can be due to natural and/or anthropogenic causes. Method: Measuring Na, Ca and Mg concentration in saturation extracts obtained from a soil paste saturated with deionized water. Units: Adimensional parameter obtained from the expression SAR = Na / ((Ca+Mg)/2)) 1/2
22 RATE OF ALCALINIZATION INDICATOR: Negative, slight, moderate, severe, very severe Objective: Quantitative control of the excess of sodium in soil by SAR values for a period of time, which reflects an edaphic process that can be due to natural and/or anthropogenic causes. Method: Difference of SAR values divided by the number of years in the period of time. Units: RAS year -1
23 LOSS OF FERTILITY INDICATORS: Loss, no variation/increase Objective: Evaluation of loss of fertility in a soil, as a function of plant-available micronutrient metals (Fe, Cu, Mn and Zn), for a period of time. Method: Difference of plant-available micronutrient metals in a DTPA solution (Lindsay and Norvell, 1978) divided by the number of years in the period of time. Units: mg kg -1 year -1 Loss of fertility indicator Fe Loss of fertility indicator Cu Loss of fertility indicator Mn Loss of fertility indicator Zn
24 RISK OF PHYTOTOXICITY INDICATORS: Increase, decrease/no variation Objective: Evaluation of risk of phytotoxicity in a soil, as a function of plantavailable trace metals (Pb and Cd), for a period of time. Method: Difference of plant-available trace metals in a DTPA solution (Lindsay and Norvell, 1978) divided by the number of years in the period of time. Units: mg kg -1 year -1 Risk of fitotoxicity Pb Risk of fitotoxicity Cd
25 CONCLUSIONS DESERNET has allowed a methodology for the identification, monitorization and attenuation of the desertification process to be developed. Such a methodology is of great interest for the particular case of the Region of Murcia
26 CONCLUSIONS The indicators applied in the Region of Murcia in the framework of DESERNET are: State of salinization (four pilot areas). Rate of salinization (four pilot areas). State of alcalinization (Vega Media). Rate of alcalinization (Vega Media). Loss of fertility: loss of micronutrient metals Fe, Cu, Mn and Zn (Vega Media). Risk of phytotoxicity: Increase of plant-available Pb and Cd (Vega Media).
27 CONCLUSIONS The methodology for the monitorization of the desertification (chemical degradation of the soil) is the following: MONITORED AREA ENVIRONMENTAL STUDY PERIODIC SOIL SAMPLING LAND USES DATA BASE GIS INDEX SPATIO-TEMPORAL INFORMATION PROPOSAL OF ACTIONS
28 CONCLUSIONS The Region of Murcia is highly interested in pursuing the active participation and exchange of experiences, data and information to control the desertification process. DESERNET is considered essential to collect, process and spread environmental information in the Mediterranean Basin.
29 SPECIFIC PROPOSALS FOR THE REGION OF MURCIA To continue the surveillance and control of desertification using the methodology developed in the DESERNET-Murcia action. To extend the surveillance process until the local scale for those cases for which high salinization/alcalinization values have been found. To extend the surveillance process until the local scale for those cases for which a loss for those micronutrient metals or an increase in assimilable heavy metals have been found. To carry out a programme in order the different social agents become aware of the importance of the desertification process and the need of joint efforts to confront it.
30 Thank you for your attention
31 Grupo de Investigación E CONTAMINACIÓN DE SUELOS Universidad de Murcia
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