Distribution of soils and landform relationships in the permafrost regions of Qinghai-Xizang(Tibetan) Plateau
LI WangPing;ZHAO Lin;WU XiaoDong;ZHAO YongHua;FANG HongBing;SHI Wei;Cryosphere Research Station on Qinghai-Xizang Plateau, State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences;
To investigate the relationship between soil distribution and landform and also provide the basic soil data for the permafrost regions on the Qinghai-Xizang(Tibetan) Plateau(QTP), the present study established a soil-landscape model using the See5.0 decision tree software with ten parameters which were selected by the statistical analysis of the field data collected during 2009–2011. A 5-fold cross-validation demonstrated that the accuracy of the model was 65.4% and 63.5% for the western and eastern part of the plateau, implying that the model was reliable for prediction of the soil mapping on the plateau. The results showed that the soils are mainly Gelisols and Inceptisols, which are accounted for 34% and 28% on the total area of the plateau. In the western part of the QTP, Gelisols, Inceptisols and Aridisols were about 43%, 30% and 17%, respectively. In contrast, the eastern part of the QTP mainly consists of Gelisols(27%), Mollisols(26%) and Inceptisols(25%). The different distribution pattern of soils between the eastern and western parts of the QTP mainly related to the climate conditions, i.e., the eastern part has warmer and wetter climate conditions. The results revealed that same type of soil showed different pattern along elevation gradients, while with some similar pattern from the perspective of parent materials. In addition, the results suggested that permafrost plays an important role in the soil-forming processes, which may led to the distribution of Aridisols mainly occurred in higher altitudes in the eastern part. Overall, the soils in the eastern part show a better development, and soil types in the east are more abundant than those of the western part. The spatial distribution of soil types in the eastern part is more homogeneous than that of the western part of the QTP.
【Fund】： 国家重大科学研究计划(2013CBA01803);; 国家自然科学基金创新群体科学基金(41121001);; 中国科学院“百人计划”项目(51Y551831)资助
【CateGory Index】： S159
【CateGory Index】： S159