坡面植物生长期内对^7Be的截留吸收及影响因素分析

~7Be IN FALLOUT INTERCEPTION AND ABSORPTION BY SLOPE PLANTS AND THE IMPACT FACTORS

对坡面植物在生长期内^7Be含量的动态变化进行研究,发现随着生长植物在生长期内^7Be含量增加,单位面积上植物截留吸收^7Be量增加;研究区坡面^7Be的植被截留吸收率为3.35%-8.44%,说明植被覆盖对土壤中^7Be含量有重要的影响。同时还发现,不同采样间隔期^7Be日均增量不定,在整个采样期内变异性大,变异系数为0.69,但从春季到夏季的前4个采样间隔期变异性相对较小;不同采样间隔期^7Be日均增量和日均降雨量呈正比,相关系数为0.64。

Different plants on slope were collected and 7^Be activity in plants was detected. The results showed that with the growth of plants, 7 ^Be activity in plants was increasing ; 7^ Be activity intercepted and absorbed by plants on slope per square meter was also increasing and reached the maximum in autumn. The percentage of 7 ^Be intercepted and absorbed by plants was 3.35 % - 8.44%, which indicated that the 7 ^Be interception-absorption by plants obviously impacted on the 7 ^Be activities in soil. The data also showed that daily average of 7^ Be increment was variable in different sampling intervals with a variation coefficient of 0.69, but the variation was relatively small in the first four sampling intervals from spring to summer. The relationship between daily average 7^ Be increment and daily average rainfall in different sampling interval was also analyzed and showed of a positive correlation with a correlation coefficient of 0.64.