137Cs示踪红壤丘陵区坡地土壤侵蚀的研究--以江西丰城市为例

通过137Cs示踪技术，并采用相关的土壤侵蚀定量模型，对红壤丘陵区江西丰城市坡面不同土地利用类型、方式以及不同地貌部位的土壤侵蚀进行了研究。结果表明：研究区137Cs的本底值为1 992.45±145.63 Bq/m2；试验区典型坡地不同地貌部位均存在着一定程度的土壤侵蚀，且侵蚀强度总的变化趋势为坡底部>坡中部>坡顶部；不同土地利用类型和方式下的坡面侵蚀强度亦呈现一定的分异现象，从大到小依次为耕作土坡面>退耕30年+退耕1年混合坡面>退耕30年坡面>荒坡。

APPLICATION OF 137Cs AS TRACING METHOD TO STUDY SOIL EROSION ON SLOPING LANDS IN THE HILLY RED SOIL AREA--A CASE STUDY IN FENGCHENG CITY, JIANGXI PROVINVE

Soil erosion is a severe problem in sloping land of hilly red area. Based on 137Cs tracing technique and by some soil erosion estimating models, the soil erosion rate on the representative sloping lands of Fengcheng City, Jiangxi Province was studied. The results showed that the reference inventory of 137Cs in the study area without soil erosion or man disturbing is 1 992.45±145.63 Bq/m2 . The annual soil erosion occurring on different parts of slope is evidentily different, with its rate increasing in the order form top of slope, middle of slope and to bottom of slope. Under different land use types, the average soil erosion rates are also different, which decreases in the order from, cultivated sloping land, multi slope of conversion from farmland for 30 a and 1 a, slope of conversion from farmland for 30 a and barren slope. This result is benefitial for making relative land use, water and soil conservation policy for the ongoing national reducing cultivated land to forestland and grassland project in the study area.