Land consolidation has a profound impact on landscape patterns and ecological functions at various scales through engineering and biological measures. In recent years, China invests more than 100 billion RMB yuan on l...Land consolidation has a profound impact on landscape patterns and ecological functions at various scales through engineering and biological measures. In recent years, China invests more than 100 billion RMB yuan on land consolidation each year. To under- stand how land consolidation affects landscape patterns and ecosystems, we investigated the ecosystem service value and the ecological connectivity in a consolidated area of Da＇an city from 2008 to 2014 using a revised ecological connectivity index. The results indicated that land consolidation has certain negative influences on the ecosystem services in this area. The total ecosystem service value will decrease by nearly 30% in the late stage of consolida- tion. This decrease is caused by the loss of ecosystem service of the wetland and grassland, despite a sensible increase of cultivated land. In addition, land consolidation could change the ecological connectivity as well as the land use structure. Up to 85% of the entire area will be in low connectivity in the late stage of consolidation, representing a 6.23% increase in the total coverage compared to pre-consolidation. Finally, the different connectivity landscape and their key areas can be identified by the revised ecological connectivity index effectively. This study is helpful to trace out the relationships between landscape pattern and ecological process, and provides insights for ecological planning and designing of land consolidation in this area. We suggest that more attentions should be paid to improve the quality and eco- system service value per unit area of the landscape, to establish ecological compensation mechanism of wetland losses, and to create the ecological corridors along the least accu- mulated impendence surface in the key areas during land consolidation.展开更多
测试了吉林省大安市苏打碱土区6—7、20—30和60—70 m 3种深度地下水的基本化学特征,对利用地下水灌溉可能引起的土壤盐化、碱化和盐碱化问题及其灌溉适宜性进行了评价。结果表明,各深度地下水均具有不同程度的苏打化特征,地下水中普...测试了吉林省大安市苏打碱土区6—7、20—30和60—70 m 3种深度地下水的基本化学特征,对利用地下水灌溉可能引起的土壤盐化、碱化和盐碱化问题及其灌溉适宜性进行了评价。结果表明,各深度地下水均具有不同程度的苏打化特征,地下水中普遍含有较多NaHCO3;30 m深度以内地下水中含有较多HCO3-和C l-,用其作为灌溉水源存在潜在的盐化和碱化双重威胁;从各盐化和碱化指标看,该区60 m深度以下的地下水质较好,作为灌溉用水不会产生盐渍化风险。30 m深度以内的地下水均不适合灌溉。展开更多
基金National Natural Science Foundation of China, No.41171152
文摘Land consolidation has a profound impact on landscape patterns and ecological functions at various scales through engineering and biological measures. In recent years, China invests more than 100 billion RMB yuan on land consolidation each year. To under- stand how land consolidation affects landscape patterns and ecosystems, we investigated the ecosystem service value and the ecological connectivity in a consolidated area of Da＇an city from 2008 to 2014 using a revised ecological connectivity index. The results indicated that land consolidation has certain negative influences on the ecosystem services in this area. The total ecosystem service value will decrease by nearly 30% in the late stage of consolida- tion. This decrease is caused by the loss of ecosystem service of the wetland and grassland, despite a sensible increase of cultivated land. In addition, land consolidation could change the ecological connectivity as well as the land use structure. Up to 85% of the entire area will be in low connectivity in the late stage of consolidation, representing a 6.23% increase in the total coverage compared to pre-consolidation. Finally, the different connectivity landscape and their key areas can be identified by the revised ecological connectivity index effectively. This study is helpful to trace out the relationships between landscape pattern and ecological process, and provides insights for ecological planning and designing of land consolidation in this area. We suggest that more attentions should be paid to improve the quality and eco- system service value per unit area of the landscape, to establish ecological compensation mechanism of wetland losses, and to create the ecological corridors along the least accu- mulated impendence surface in the key areas during land consolidation.
