As a major worldwide issue,desertification poses significant threats to ecosystem stability and long-term socioeconomic growth.Within China,the Mu Us Sandy land represents a crucial region for studying desertification...As a major worldwide issue,desertification poses significant threats to ecosystem stability and long-term socioeconomic growth.Within China,the Mu Us Sandy land represents a crucial region for studying desertification phenomena.Comprehending how desertification risks are distributed spatially and what mechanisms drive them remains fundamental for implementing effective strategies in land management and risk mitigation.Our research evaluated desertification vulnerability across the Mu Us Sandy land by applying the MEDALUS model,while investigating causal factors via geographical detector methodology.Findings indicated that territories with high desertification vulnerability extend across 71,401.7 km^(2),constituting 76.87%of the entire region,while zones facing extreme desertification hazard cover 20,578.9 km^(2)(22.16%),primarily concentrated in a band-like pattern along the western boundary of the Mu Us Sandy land.Among the four primary indicators,management quality emerged as the most significant driver of desertification susceptibility,followed by vegetation quality and soil quality.Additionally,drought resistance,land use intensity,and erosion protection were identified as the key factors driving desertification sensitivity.The investigation offers significant theoretical perspectives that can guide the formulation of enhanced strategies for controlling desertification and promoting sustainable land resource utilization within the Mu Us Sandy land region.展开更多
塔里木河流域面临植被退化、土地荒漠化等生态问题,为解决这一问题,需要开展荒漠化敏感性评估。采用遥感、全球定位系统和地理信息系统,构建土壤、植被、气候和管理质量等指标定量评估,利用地中海荒漠化与土地利用(Mediterranean Desert...塔里木河流域面临植被退化、土地荒漠化等生态问题,为解决这一问题,需要开展荒漠化敏感性评估。采用遥感、全球定位系统和地理信息系统,构建土壤、植被、气候和管理质量等指标定量评估,利用地中海荒漠化与土地利用(Mediterranean Desertification and Land Use,MEDALUS)模型计算敏感性指数获取荒漠化敏感区,在此基础上分析荒漠化敏感性的驱动因素。结果表明,塔里木河流域属于极高敏感区。荒漠化敏感性的空间格局是中部高、北部低,主要由与人类活动有关的管理质量指数决定。从绿洲内至绿洲外,荒漠化敏感性逐渐升高,大致呈层状分布,表明人类活动对荒漠化影响显著,建议加强和巩固绿洲外围的防护体系建设。展开更多
Assessment of land sensitivity to desertification is an important step to support desertification monitoring and control.Based on the Mediterranean Desertification and Land Use(MEDALUS)model,we defined four quality in...Assessment of land sensitivity to desertification is an important step to support desertification monitoring and control.Based on the Mediterranean Desertification and Land Use(MEDALUS)model,we defined four quality indicators(soil,climate,vegetation and management)to evaluate the sensitivity of land in northern China to desertification.We improved MEDALUS via excluding cities from the areas at risk of desertification by means of defining a threshold value for population density.The framework,validated in northern China,further optimizes the model to link priority areas and land restoration programmed to support desertification control.We found that the four indicators influenced and restricted each other,which jointly affected the distribution of desertification sensitivity in northern China.The spatial distribution of sensitivity in northern China showed large regional differences,with clear boundaries and concentrated distributions of regions with high and low sensitivity;the overall sensitivity decreased,with some areas rated as having moderate,severe,and extremely severe sensitivity changing to slight sensitivity;and the influence weight was much higher for the management quality index than for the climate,vegetation,and soil indexes.This suggests that management was the main factor that affected desertification sensitivity in northern China,and that climate factors exacerbated sensitivity,but the factors that are driving the spatial heterogeneity of the influencing factors need further study。展开更多
Desertification process as a great problem affects most of the countries in the world. This process has a high rate in arid and semiarid areas. Today, human societies are en- countering the desertification phenomenon ...Desertification process as a great problem affects most of the countries in the world. This process has a high rate in arid and semiarid areas. Today, human societies are en- countering the desertification phenomenon as a serious problem which causes various ir- reparable damages to economic and social sectors. In order to assess desertification results in production of different regional models for their application in another region the indices should be re-investigated and adjusted to local conditions. Several models have been de- veloped for desertification evaluation. The present study, attempts to assess quantitatively the desertification process has in an area located at Sistan plain of Iran （Niatak region as a case study） by using Modified MEDALUS method. The obtained results indicated that of the whole studied region （comprising 4819.6 acres）, 2651.56 acres （55%） are located in medium de- sertification intensity class, 1269.48 acres （26.34%） are positioned in severe desertification intensity class, and 898.54 acres （18.64%） are placed in vary severe desertification intensity class.展开更多
This study aimed to assess land degradation sensitivity of an area contributing to desertification risk in Lam Ta Kong Watershed using Environmental Sensitivity Area Index(ESAI).Five risk factors comprised climatic,so...This study aimed to assess land degradation sensitivity of an area contributing to desertification risk in Lam Ta Kong Watershed using Environmental Sensitivity Area Index(ESAI).Five risk factors comprised climatic,soil,geographical,land utilization and vegetation,and water resources factors together with fifteen sub-factors were used to analyze the sensitivity to land degradation.The spatial analysis was calculated using Geographic Information System(GIS)and Remote Sensing(RS)techniques.The key factors influencing land degradation risks in the watershed area were analyzed using the triangular fuzzy numbers(TFNs)method.The results showed that approximately 33%of Lam Ta Kong watershed was affected by a high desertification risk excluded the water bodies and around 24.64%of the area suffered from a moderate risk.This research pointed out that key factors causing land degradation and desertification in the watershed area were related to the soil factors,followed by climatic,geographical factors,water resources,and land utilization and vegetation,respectively.The results of this study can be used as a database for planning and implementing area-based mitigations and measures as well as for land use planning in the watershed area.展开更多
In this paper,the assessment of the sensitivity of the soil in the rural area of (C)ukarica municipality to the processes of degradation is considered.Land areas,especially in the vicinity of large cities,are exposed ...In this paper,the assessment of the sensitivity of the soil in the rural area of (C)ukarica municipality to the processes of degradation is considered.Land areas,especially in the vicinity of large cities,are exposed to numerous processes of degradation:soil erosion,urban and industrial zone expansion at the expense of fertile agricultural soils,activation of landslides and a number of other significant ecological problems.Based on the characteristics of the research area,the MEDALUS (Mediterranean Desertification and Land Use) model was applied,and for the assessment of sensitivity to the processes of degradation the main quality indicators were considered:soil,climate,vegetation and management.For each of the analyzed quality indicators,parameter groups were identified.Each parameter is quantified according to the defined method by giving them a sensitivity coefficient between 1.0 and 2.0.ArcGIS 10.0 has been applied to analyze and prepare layers of quality maps.Subsequently,the geometric mean for all four quality indicators was used to generate the map of environmental sensitivity to degradation.The results obtained show that 41.54% of the study area is classified as critical;22.34% of the surface as fragile;8.47% of the areas are potentially endangered and 9.58% not threatened to degradation processes.The results have also shown that MEDALUS model is a functional tool for simulations which support sustainable land management in the areas prone to degradation.展开更多
基金the National Natural Science Foundation of China(Grant No.42301336)the Open Research Fund of Henan Provincial Key Laboratory of Hydrosphere and Watershed Water Security(Grant No.HWWSF202302).
文摘As a major worldwide issue,desertification poses significant threats to ecosystem stability and long-term socioeconomic growth.Within China,the Mu Us Sandy land represents a crucial region for studying desertification phenomena.Comprehending how desertification risks are distributed spatially and what mechanisms drive them remains fundamental for implementing effective strategies in land management and risk mitigation.Our research evaluated desertification vulnerability across the Mu Us Sandy land by applying the MEDALUS model,while investigating causal factors via geographical detector methodology.Findings indicated that territories with high desertification vulnerability extend across 71,401.7 km^(2),constituting 76.87%of the entire region,while zones facing extreme desertification hazard cover 20,578.9 km^(2)(22.16%),primarily concentrated in a band-like pattern along the western boundary of the Mu Us Sandy land.Among the four primary indicators,management quality emerged as the most significant driver of desertification susceptibility,followed by vegetation quality and soil quality.Additionally,drought resistance,land use intensity,and erosion protection were identified as the key factors driving desertification sensitivity.The investigation offers significant theoretical perspectives that can guide the formulation of enhanced strategies for controlling desertification and promoting sustainable land resource utilization within the Mu Us Sandy land region.
文摘塔里木河流域面临植被退化、土地荒漠化等生态问题,为解决这一问题,需要开展荒漠化敏感性评估。采用遥感、全球定位系统和地理信息系统,构建土壤、植被、气候和管理质量等指标定量评估,利用地中海荒漠化与土地利用(Mediterranean Desertification and Land Use,MEDALUS)模型计算敏感性指数获取荒漠化敏感区,在此基础上分析荒漠化敏感性的驱动因素。结果表明,塔里木河流域属于极高敏感区。荒漠化敏感性的空间格局是中部高、北部低,主要由与人类活动有关的管理质量指数决定。从绿洲内至绿洲外,荒漠化敏感性逐渐升高,大致呈层状分布,表明人类活动对荒漠化影响显著,建议加强和巩固绿洲外围的防护体系建设。
基金the National Key Research and Development Program of China(2020YFA0608404)the National Nature Science Foundation of China(41101006).
文摘Assessment of land sensitivity to desertification is an important step to support desertification monitoring and control.Based on the Mediterranean Desertification and Land Use(MEDALUS)model,we defined four quality indicators(soil,climate,vegetation and management)to evaluate the sensitivity of land in northern China to desertification.We improved MEDALUS via excluding cities from the areas at risk of desertification by means of defining a threshold value for population density.The framework,validated in northern China,further optimizes the model to link priority areas and land restoration programmed to support desertification control.We found that the four indicators influenced and restricted each other,which jointly affected the distribution of desertification sensitivity in northern China.The spatial distribution of sensitivity in northern China showed large regional differences,with clear boundaries and concentrated distributions of regions with high and low sensitivity;the overall sensitivity decreased,with some areas rated as having moderate,severe,and extremely severe sensitivity changing to slight sensitivity;and the influence weight was much higher for the management quality index than for the climate,vegetation,and soil indexes.This suggests that management was the main factor that affected desertification sensitivity in northern China,and that climate factors exacerbated sensitivity,but the factors that are driving the spatial heterogeneity of the influencing factors need further study。
文摘Desertification process as a great problem affects most of the countries in the world. This process has a high rate in arid and semiarid areas. Today, human societies are en- countering the desertification phenomenon as a serious problem which causes various ir- reparable damages to economic and social sectors. In order to assess desertification results in production of different regional models for their application in another region the indices should be re-investigated and adjusted to local conditions. Several models have been de- veloped for desertification evaluation. The present study, attempts to assess quantitatively the desertification process has in an area located at Sistan plain of Iran （Niatak region as a case study） by using Modified MEDALUS method. The obtained results indicated that of the whole studied region （comprising 4819.6 acres）, 2651.56 acres （55%） are located in medium de- sertification intensity class, 1269.48 acres （26.34%） are positioned in severe desertification intensity class, and 898.54 acres （18.64%） are placed in vary severe desertification intensity class.
基金This research is funded by the“Innovation in Increasing the Organic Carbon in Soil for Sustainable Agricultural Purpose in Saline Soil Areas:First Year Pilot Project at the Lam Ta Kong Watershed”,Ratchadaphisek Somphot Endowment Fund 2014,Chulalongkorn University(CU-57-090-IC).
文摘This study aimed to assess land degradation sensitivity of an area contributing to desertification risk in Lam Ta Kong Watershed using Environmental Sensitivity Area Index(ESAI).Five risk factors comprised climatic,soil,geographical,land utilization and vegetation,and water resources factors together with fifteen sub-factors were used to analyze the sensitivity to land degradation.The spatial analysis was calculated using Geographic Information System(GIS)and Remote Sensing(RS)techniques.The key factors influencing land degradation risks in the watershed area were analyzed using the triangular fuzzy numbers(TFNs)method.The results showed that approximately 33%of Lam Ta Kong watershed was affected by a high desertification risk excluded the water bodies and around 24.64%of the area suffered from a moderate risk.This research pointed out that key factors causing land degradation and desertification in the watershed area were related to the soil factors,followed by climatic,geographical factors,water resources,and land utilization and vegetation,respectively.The results of this study can be used as a database for planning and implementing area-based mitigations and measures as well as for land use planning in the watershed area.
文摘In this paper,the assessment of the sensitivity of the soil in the rural area of (C)ukarica municipality to the processes of degradation is considered.Land areas,especially in the vicinity of large cities,are exposed to numerous processes of degradation:soil erosion,urban and industrial zone expansion at the expense of fertile agricultural soils,activation of landslides and a number of other significant ecological problems.Based on the characteristics of the research area,the MEDALUS (Mediterranean Desertification and Land Use) model was applied,and for the assessment of sensitivity to the processes of degradation the main quality indicators were considered:soil,climate,vegetation and management.For each of the analyzed quality indicators,parameter groups were identified.Each parameter is quantified according to the defined method by giving them a sensitivity coefficient between 1.0 and 2.0.ArcGIS 10.0 has been applied to analyze and prepare layers of quality maps.Subsequently,the geometric mean for all four quality indicators was used to generate the map of environmental sensitivity to degradation.The results obtained show that 41.54% of the study area is classified as critical;22.34% of the surface as fragile;8.47% of the areas are potentially endangered and 9.58% not threatened to degradation processes.The results have also shown that MEDALUS model is a functional tool for simulations which support sustainable land management in the areas prone to degradation.
