核素示踪法研究农耕地土壤侵蚀的定量模型及其评价

Quantitative models and their evaluations by using radionuclide to trace soil erosion

应用137Cs示踪技术估算农耕地土壤侵蚀量的定量模型主要有两类:径流小区上建立的经验关系式及各种理论模型。文章主要对各种主要模型作了简要介绍,并对各种模型的优点、局限性进行了比较和评价;指出今后在模型的建立和应用中注意的问题。09jgg$g2l!1Mng:44Ntd。deIH20{lse3MxBijL&:nwlxxatx*rrr。k$1lreX4各种主要模型作了简要介绍。并对各种模型的优点、局限性进行了L田获$叶平价;指出今后在模型的建立和应用中注意的问题。

There are two types of models often used in estimating soil erosion on the cultivated land, which are empirical formula and theoreticalmodels. The main medels are introduced and their advantages and limitations are also compared and evaluated; what we must paid great attentionto are proposed when it comes to setting up and applying the erosion mode1s.