摘要
水平—垂直地带性分布作为有机整体在该区土壤分布中表现得极为突出。由此得出外流河谷系统内土壤地带性的二维层性及其分布形式的“有序与和谐”的推论。该区河谷内土壤,可能尚有1—2新类型待分出。将暗褐土提高到土类的地位,建立起温带(含暖温与寒温)半湿润山地土壤负垂谱的典型结构。提出了“同心半圆式”为西藏独有的土壤微域分布形式的新概念。
Under the control of the valley direction,soils in the reaches showthe regularity of the distribution of longitudial zonality,with 3 divid-ing horizontal zones.Discussion is made respectively on the verticalsequence of alpine soils and valley soils by utilizing the concept of thenegative vertical spectrum.To alpine soils,the structure of the verti-cal spectrum is simple.However,to valley soils,there is a typicalstructure of the negative vertical spectrum in each of the horizontalzones as well as 7 new structures being inferred.An organic combina-tion of the horizontal and vertical zonality is the significant characteri-stic of the distribution of soils in the reaches.Therefore,an assump-tion is made that the soil zonality expresses“the nature of two-dimen-sional layers”and the whole distribution of soils indicates the har-moniousness with perfect order within the system of the river valleyoutflow.On the basis of the assumption and the soil taxonomical levelavailable,1-2 new soil groupsare found to be divided.An exact defini-tion of shrubby steppe soil(Arga soil)is made with the climaticaland biological condition being taken into account.Dark drob forest soil-is considered as a new soil group.A typical structure of the nega-tive vertical spectrum is built into the temperate and semi-moistmoun-tain soil.Regularity of micro-regional distribution specific to soilsin Tibet is summarized,and the concept of concentric semi-circle likedistribution is newly created.
出处
《西南农业大学学报（自然科学版）》
CSCD
1989年第1期37-44,共8页
Journal of Southwest Agricultural University
关键词
土壤
地理学
分布规律
soil zonzlity
distribution
laws
Tibet.
