摘要
冲积土壤剖面质地层次的垂向变化是一个十分复杂的问题，长期以来都是定性描述而无法定量化。但土壤剖面的质地层次组合特点对土壤水分转化和溶质运移等具有重要影响，对其定量地描述和研究是进一步准确定量区域农田水转化和溶质运移的基础。马尔可夫链理论是用来描述随时间（空间）变化的一个离散状态序列的状态转移特性的，本文将其引入来研究冲积土壤剖面质地层次的垂向变化规律。研究结果表明，区域冲积土壤剖面质地层次的垂向变化具有明显的马氏性，其转移概率矩阵（ＴＰＭ）具有近似平稳的特点；研究区内土壤质地层次以粘土层为主，其次依次为沙土层、沙壤层、中壤层、轻壤层和重壤层，组合方式以粘－沙、沙－粘，粘－沙－粘和沙－粘－沙为主。
The vertical changes of textural
layers along profiles in alluvial soils are a verycomplicated problem. The vertical changes can
be described only qualitatively but havenot been quantified for a long time past. The
characteristics of combination of texturallayers in soil profiles greatly influence water transport
and solute movement in the soil,so the quantitative description is a foundation for more
accurate quantification of watertransport and solute movement in field soils.Markov chain
theory can be used to characterize the state transition of a dispersedstate sequence changing
with time (or space). This work used it to study regulationsof vertical changes of textural layers
along profiles in alluvial soils. The resultsshowed that the vertical changes of textural layers
along profiles had Markovcharacteristic in an alluvial soil region and that its transition
probability matrix (TPM)was nearly stable. Meanwhile, the features of combination of soil profile
texturallayers in the study region were studied by TPMs, entropy group values and
similaritymeasures. Among soil textural layers in the study region, clay layers were
predominant,then came sand soil layers, sand loam layers, medium loam layers, light loam
layersand heavy loam layers in proper order. The combination patterns of textural layers insoil
profiles are mainly clay-sand, sand-clay, clay-sand-clay and sand-clay-sand.
出处
《土壤学报》
CAS
CSCD
北大核心
1999年第1期15-24,共10页
Acta Pedologica Sinica
基金
国家自然科学基金
关键词
冲积土壤
质地层次
马氏链
转移概率矩阵
Soil
textural layer, Vertical changes, Markov chain, Transitionprobability Matrix (TPM)
