青藏高原特殊景观区土壤样品代表性方法试验研究

Test Study on Representative Method of Soil Sample in Special Landscape Area of Qinghai-Tibet Plateau

选择在青藏高原具有代表性的特殊景观区,通过方法试验对1∶25万土地质量地球化学调查中“网格化”布点和“汇水域”布点的土壤样品的代表性进行对比研究,研究结果表明在以黄土为主要成土母质的丘陵区、中低山区和以冲洪积为成土母质的冲积平原区以均匀性为主导,兼顾主要的土壤类型或土地利用类型为辅进行布点取样,在以岩石风化物和冲洪积物为主要成土母质的中低山区和丘陵区样点应布设在成土母质易于汇集的沟谷中,同时兼顾主要土壤类型或土地利用类型尽量均匀布点。

A comparative study on the representation of"grid"and"catchment area"soil samples in the 1:250000 land quality geochemical survey was carried out by means of a method test in the special landscape area of the Qinghai-Tibet Plateau.The results show that in hilly region with loess as main soil parent material,middle and low mountain area and alluvial plain area with alluvial deposit as main soil parent material,uniformity is dominant,and the main soil types or land use types are taken as auxiliary points.In the middle and low mountains and hilly areas where rock weathering and alluvial deposits are the main soil parent materials,the sample points should be arranged in the gully where the soil parent materials are easy to collect,and the main soil types or land use types should be evenly distributed as far as possible.