摘要
建立了一个根据农业耕作土壤剖面中１３７Ｃｓ的损失量与土壤侵蚀量之间关系的定量模型。在假设１３７Ｃｓ在耕层中得到充分的混合而变得均一的基础上，根据质量平衡模型推导而成。模型显示１３７Ｃｓ的衰变常数，年沉降分量，耕层厚度和采样年份对年平均土壤侵蚀速率都有重大影响．模型结果还说明，１３７Ｃｓ的损失量与年平均土壤侵蚀量之间的关系既非线性关系亦非指数关系，而是一种复杂的曲线关系。
According to mass balance model and the assumption that ceasium-137 in plowed soils shows a uniform distribution through the plow layer,a quantitative model was developed to relate the amount of caesium-137 loss from the cultivated soil profile to rate of soil erosion. The model shows the facts that the radioactive decay of 137Cs, 137Cs input fraction,the depth of, plowed layer and sampling year have a great influence upon cultivated soil loss from soil profile. The result of model proves that the relationship between the de of soil loss and 137Cs depletion is neither linear nor logarithmic.
出处
《土壤学报》
CAS
CSCD
北大核心
2000年第3期296-305,共10页
Acta Pedologica Sinica
基金
日本农林水产省研究基金
中国科学院红壤生态开放实验站基金
中国科学院院长基金
关键词
铯-137
土壤侵蚀速率
定量模型
农业耕作土壤
Caesium-137(137Cs), Rate of soil erosion, Quantitative model, Cultivated soil
