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国际水土保持研究（英文）
国际水土保持研究（英文）

季刊

2095-6339

国际水土保持研究（英文）/Journal International Soil and Water Conservation ResearchCSCD北大核心SCI
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    Three-dimensional spatiotemporal variation of soil organic carbon and its influencing factors at the basin scale

    Lingxia WangZhongwu LiXiaodong NieYaojun Liu...
    885-895页
    查看更多>>摘要：The variability of soil organic carbon(SOC)extends across three dimensions.However,quantitative analyses of the factors influencing spatiotemporal variations of SOC in various soil depth is scarce.This study leverages legacy data from two soil surveys conducted in the Dongting Lake Basin during the 1980s and the 2010s,employing Random Forest models to generate three-dimensional SOC maps.Through correlation analysis and permutation importance,we identified the primary factors driving temporal and spatial changes of SOC.The results showed that in the 2010s,SOC storage up to a depth of 1 m in the Dongting Lake Basin was approximately 2.95 Pg,increasing at an average rate of 0.0047 Pg C per year since the 1980s.Regions with higher average SOC contents were predominantly found in the western,southern,and eastern parts of the basin,despite significant losses over the 30-year period.In contrast,the central and northern areas,which initially had lower SOC contents in the 1980s,exhibited increases by the 2010s.Soil depth was the most influential predictor of SOC patterns in both the 1980s and 2010s.Meanwhile,relief and organism factors were primarily responsible for spatial variations in SOC,with the influence of organism factors diminishing by the 2010s.The temporal variations of SOC were chiefly attributed to changes in soil conservation practices,extreme precipitation events,and grain production.Consequently,it is imperative to prioritize ecological restoration and conservation tillage practices to mitigate the impacts of extreme weather conditions and safeguard food security.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Divergent behaviour of soil nutrients imprinted by different land management practices in the Three Gorges Reservoir Area,China

    Minxin SongQiang TangChen HanChuan Yuan...
    896-907页
    查看更多>>摘要：Soil nutrients are essentially regulated by land management practices via modulating biotic element input and metabolism.The Three Gorges Reservoir Area in China was dominated by a farming landscape,but land management has become diversified over recent decades.How these restorative management practices may have affected soil nutrients is not completely understood.In this study,a space-time substitution approach was applied to evaluate soil nutrients and their stoichiometric changes in response to post-farming land management practices.Soil samples(0-10 cm,10-20 cm,and 20-40 cm)were collected from present-day croplands,cypress plantations,eucalyptus plantations,abandoned croplands,and citrus plantations.Soil organic matter,soil organic carbon,total nitrogen,alkaline hy-drolyzed nitrogen,total phosphorus,and available phosphorus were determined.The results showed that soil organic matter and total nitrogen in abandoned croplands,cypress plantations,eucalyptus plantations and citrus plantations were increased by 186％and 190％,184％and 107％,45％and 33％,45％and 54％,respectively,in comparison with those of present-day croplands.Soil nutrients except for total phosphorus decreased with soil depth by exclusion of tillage mixing.Comprehensive soil nutrient index showed that abandoned croplands(0.90)and cypress plantations(0.72)exhibited favorable nutrient recovery capacity.Soil C:P and N:P ratios increased in abandoned croplands,cypress plantations,and eucalyptus plantations.Phosphorus may become a limiting factor for plant growth with prolonged re-covery in abandoned croplands,cypress plantations,and eucalyptus plantations,while soil organic matter and total nitrogen deficiencies were exacerbated in citrus plantations and present-day croplands.Therefore,cropland abandonment and reforestation(particularly cypress trees plantation)are recom-mended options for restoring soil nutrients in the Three Gorges Reservoir Area.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Geospatial evaluation of the agricultural suitability and land use compatibility in Europe's temperate continental climate region

    Andrei DornikMarinela Adriana CheţanTania Elena CrişanRaul Heciko...
    908-919页
    查看更多>>摘要：Land suitability assessment is used in conjunction with geographic information systems to spatially model diverse aspects of soil functions,having the potential to facilitate a sustainable increase in agri-cultural production,reduce land degradation,or aid humans in adapting to climate change.Compared to the existing datasets,this study provides a new higher resolution geospatial assessment of the agri-cultural land suitability for several crops and land uses in the temperate continental climate across Europe.To model the land suitability we used geospatial data depicting seventeen eco-pedological in-dicators(e.g.soil texture,pH,porosity,temperature,precipitation,slope).To evaluate how the land is utilized,the suitability maps have been spatially cross-tabulated with a crop map.Over the entire study area,wheat and barley showed significant suitable land in the southern part,potatoes,and sugar beet exhibited the highest extent of suitable land in the northern parts,while corn and sunflower exhibited a much lower extent of suitable land.Water table depth,precipitation,temperature,terrain slope,soil porosity,SOC,and topsoil texture emerged as the limiting factors for agricultural suitability in the study area.Our results show that the suitable arable land does not have space left for the expansion of crops,however,we have identified regions with extensive cultivation of wheat and corn on unsuitable land with the potential for cultivation of more suitable crops such as barley,sunflower,sugar beet,and potato.It seems that one action that can enhance agricultural practices in the study area is to better allocate each cultivated crop across more suitable lands.
      原文链接:
    • NETL
    • NSTL
    • 万方数据