利用~(137)Cs技术研究土壤可蚀性的时空变异(英文)

土壤可蚀性的研究变异性是当代土壤侵蚀预测预报研究的核心。本综述了土壤可蚀性变异性研究的进展及存在的问题，提出了利用＾１３７Ｃｓ法定量测定土壤可蚀性时空变异的新技术。

DETERMINING THE VARIABILITY=OF SOIL ERODIBILITY FOR=EROSION PREDICTION

Soil erodibility refers to the susceptibility or resistance of a soil to detach ment and transport by erosion for a particular site. Accurate prediction of soil erosion strongly requires a sufficient understanding of the variability in soil erodibility parameters. This paper reviews the existing knowledge on these topic s and defines research gaps. In the framework of soil erosion prediction studies it is important to consider soil erodibility at various temporal and spatial sca les. Little research has hitherto been conducted on quantitative assessment of s patial variability in soil erodibility and its relation to soil condition factor s at different landscape level. But such information on this aspect is crucial f or quantitatively describing the paths of erosion and to develop solutions or co nceptions to interrupt these paths within the landscape. From this review, it ca n be concluded that special attention must be paid to the quantitative assessmen t of soil erodibility at various scales up to the catchment scale. The results o f such studies should be used to relate erodibility parameters to soil condition factors that can be measured easily and confidently. Caesium-137 approach woul d be a reliable method for determining spatial variability in soil erodibility wit hin the landscape, which has fast, inexpensive and accurate advantages over many classical measuring techniques.