以苏南低山丘陵区茶园土壤侵蚀与土壤质量改变为研究对象,并取自然状态的杂木林为参照,用137Cs法估算土壤侵蚀速率;以土壤粗化度、土壤有机质含量及土壤含水量描述土壤质量;在绝对数值的基础上,用变化量探讨研究对象的变化方向与幅度。对比耕作土与非耕作土的土壤侵蚀与土壤质量改变及将它们结合起来研究表明,人类活动有可能加剧土壤侵蚀,加快土壤质地粗化;合理的农业措施虽可减缓土壤质量下降,但防治侵蚀方可治本。
The soil erosion and the soil properties change in the low mountains and hills of South Jiangsu Province are chosen as a target of study. And the uncultivated soil that is hardly disturbed in the miscellaneous forest is used as a reference. The soil erosion rates in the study area are estimated based on the redistribution of cesium-137 tracer element. Then the change amount of soil properties are discussed by means of some description indexes of the ratio of the coarse-particle to the fine-particle, the content of organic matter, the content of water and the change amount of indexes per unit slope length and by comparison between the cultivated soil and the uncultivated soil. The results of research show that human disturbance may increase soil erosion and raise the ratio of the coarse-particle to the fine-particle. Although some rational measures are available to slow down the pace of soil properties degradation, it is best way to control the soil erosion.
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