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Spatial variability of soil organic carbon stock in an olive orchard at catchment scale in Southern Spain

International Soil and Water Conservation Research 2023年第2期11卷 311-326页

作者： Jose A.Gòmez gema guzmán Tom Vanwalleghem Karl Vanderlinden Institute for Sustainable Agriculture.Spanish national Research Council(IAS-CSIC) Alameda del Obispo S/N14004CordobaSpain Department of Agronomy University of CordobaCampus de Rabanales14071CordobaSpain Centro IFAPA Alameda del Obispo 14004CordobaSpain

Orchards have a high potential for carbon ***,little research is available on the spatial variability at catchment scale and on the difference between the tree area and the *** analyzed theik spatial variability of soil organic carbon stock,SOCstock at 90 cm depth in an 8-ha catchment in Southern Spain with olives on a vertic *** showed higher soil organic carbon concentration,SOC,in the tree area as compared to the lane up to 60 cm depth,but its impact on SOCstock was negligible since it was compensated by the higher soil bulk density in the *** at different depths was correlated with that in the top 0-5 *** overall SOCstock of the orchard was 4.14 kg m^(-2),ranging between 1.8 and 6.0 kg m^(-2).This SOCstock is in the mid-lower range of values reported for olive orchards,measured at smaller scale,and similar to those other intensive field crops and agroforestry under comparable rainfall *** spatial variability in SOCstock was correlated to several geomorphological variables:elevation,cumulative upstream area,topographic wetness index,sediment transport index,and tillage *** in SOC and SOCstock are driven by the sediment redis-tribution downslope,mainly by tillage erosion,and higher soil water availability in lower areas allowing higher biomass *** topographic indexes and the correlation between SOC in the topsoil and SOCstock up to 90 cm should be further explored in other typology of olive orchards for facilitating the mapping of SOC_(stock).

关键词： Carbon sequestration Mediterraneancrops Catchment Spatial variability Vertic soils

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In-depth analysis of soil management and farmers’perceptions of related risks in two olive grove areas in southern Spain

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International Soil and Water Conservation Research 2021年第3期9卷 461-473页

作者： José A.Gòmez Ana Sanchez Montero gema guzman Marfa-Auxiliadora Soriano a Institute for Sustainable Agriculture CSICCordobaSpain Agronomy Department University of CordobaCordobaSpain

This manuscript presents a questionnaire-based study aimed to provide a detailed analysis on the different soil management carried out by olive farmers in two representative olive-growing areas in southern Spain(Cordoba and Estepa),their perceptions on cover crop use and the possible influence of the different types of farms and farmers’typologies on these *** results show a relatively large variability of soil management,with fourteen options,as a result of a combination of different alternatives for bare soil and cover crops with the use or not of pruning residues,but with a great similarity between both *** results indicate a high adoption of soil conservation measures in the two study areas,with 63%of farmers using cover crops and 80%a mulch of pruning residues,higher than that reported in previous studies in Southern Spain,and a trend of lower use of these techniques by less experienced and younger *** high penetration of soil conservation measures resulted in a significant reduction of soil erosion risk,as indicated by the relatively low values for the cover and management factor(C)of RUSLE,also calculated and presented in this study,but also the possibility of focusing further efforts on fanners with less *** results indicate the persistence of a minor,but relevant,percentage of farmers using bare soil management(37%)and no mulching(20%),with a moderate concern on the impact of soil erosion on soil degradation and provision of ecosystem *** suggests the need to concentrate efforts also on this cluster of farmers to enhance the success of what seems to be a remarkable expansion of the use of soil conservation measures in recent decades in Southern Spain,but also in similar areas in the Mediterranean basin.

关键词： Tillage Cover crops Olive yield Erosion risk Irrigation Questionnaire

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