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タイトル: Classification of the size distribution of soil aggregates in arid and semi-arid regions in East Asia
著者: Okayasu, T.
Takeuchi, K. 
キーワード: drysieving
発行日: 2004年
出版者: 社団法人環境情報科学センター
掲載誌情報: Journal of Environmental Information Science. 32(5), 2004, pp. 63-70
抄録: Broad-scale evaluation of wind erosion requires details of the spatial distribution of the primary factors controlling wind erosion, such as soil characteristics, vegetation cover and soil water conditions. Soil aggregates are one of the factors, and their size distributions have usually been mapped by assuming a one-to-one relationship with soil texture class. We dry-sieved 31 soil samples from arid and semi-arid regions in East Asia. Cluster analysis showed that the size distribution of aggregates varied even within a single soil texture class, mainly because of the difference in soil types, indicating that the above assumption does not hold in this region. Azonal aeolian sediments have typical well-sorted forms of size distributions, but zonal steppe soils show various patterns of size distribution. Parent material can be a good indicator to use to classify the size distributions of aggregates in steppe soils, loess materials and soils formed on newer (Quaternary and Cretaceous) igneous rock (finer soils), on sedimentary materials (coarser soils), and on ancient geological layers (complex, coarse particle size composition). Soil maps and geological maps of this region are readily available, so the mapping of soil aggregates in relation to these thematic maps should be efficient and practical.
URI: http://hdl.handle.net/2261/35825
出現カテゴリ:1162010 学術雑誌論文
014 自然科学


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