Natural landscape types and soil physicochemical properties of Dehang Valley in Hunan Province,China
To further understand the characteristics of the natural landscape of Dehang Valley in Hunan Province,explore the classification methods of the valley landscape,and lay a foundation for the study of canyon landscape ecology,14 factors that can reflect the characteristics of the valley landscape,such as geology,soil,and vegetation,were selected as classification indicators.A systematic clustering method was used to classify the landscape types,while the physicochemical properties of the soil in each landscape group were measured.The results showed that(1)the natural landscape of Dehang Valley could be divided into one landscape class,four landscape groups,and 13 landscape types,with notable landscape features.(2)The soil physicochemical properties of each landscape group were different.The soil pH value(6.65),available nitrogen(0.26 g/kg),available potassium(0.03 g/kg),Ca(0.93 g/kg),and Mn(0.09 g/kg)contents of the cliff top group were significantly lower than those in other groups(P＜0.05).The content of moisture(37.22％),organic matter(86.02 g/kg),total nitrogen(9.88 g/kg),and available nitrogen(0.92 g/kg)of the cliff wall group(excluding arid rock wall)were significantly higher than those in other groups(P＜0.05).(3)In terms of the evolution mode,Dehang Valley conformed to the top-down normal valley evolution mode,and there were certain evolution rules among landscape types that can be transformed into each other under specific conditions.The landscape classification system of Dehang Valley,which was obtained from systematic clustering,reflects the spatial form,spatially heterogeneous combination,occurrence process,and ecological function of the valley landscape ecosystem.The classification results are scientific and reliable and can be used as a reference for classifying small-scale landscapes and other special geomorphic landscapes,such as valleys.There are significant differences in the appearance characteristics,species composition,and soil physicochemical properties of various landscape types within the valley;therefore,research on canyon landscape ecology needs to be conducted at the landscape type scale.
landscape classificationvalley landscapesoil physicochemical propertyDehangXiangxi UNESCO Global Geopark
万方数据
维普
