《Table 2 Simplification of the basic soil layers》

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《西藏土种志——基于全国第二次土壤普查的数据集》

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For soils developed from the sedimentary parent materials，soil type is classified by the soil texture construction.The soil texture configuration is defined by a combination of three layers，that is，0–30 cm as the upper layer，30–60 cm as the middle layer，60–100 cm as the lower layer.Tibetan soils are classified as 11basic soil layers following the influence degrees of soil texture and gravel content on agricultural productions（Table 1）.The 11 basic soil layers can be simplified according to the practical laws of fine classification for upper layers and broad classification for lower layers（Table 2）.According to the combination of the upper，middle and lower basic soil layer types，five soil configurations are named as homogeneous pattern，body pattern，bottom pattern，heart pattern，and threesection pattern.The homogeneous pattern refers to only one basic soil layer in a100 cm soil profile，for example，the gravel soil and boulder-clay soil.The body pattern refers to two different basic soil layers（0–30 cm and 30–100 cm）in a100 cm soil profile，for example，a stony loam with 0–30 cm of the loam layer and 30–100 cm of the gravel layer.The bottom pattern refers to two different basic soil layers in one profile which are located at 0–60 cm and 60–100 cm layers，for example，a sand bottom gravel clay soil with a gravel clay layer in the upper and middle layers and a sand layer in the lower layer of the soil profile.The heart pattern refers to a soil profile with a 20–30 cm thick different basic soil layer in the middle of 20 to 50 cm.The three-section pattern refers to a soil profile with different basic soil layers in the upper，middle，and lower layers，for example，a gravel bittern-boulder clay heart-loamy soil with a loamy upper layer，a boulderclayey middle layer，and a gravel lower layer.