CAJ | 학술논문

通过高分辨低本底的α能谱检测技术对采自南海西沙群岛(JYI-1、JYI-2)和鹿回头半岛(LHT)三株黑角珊瑚骨骼中的210 Pb 进行了测定,利用过剩210 Pb 比活度在珊瑚横截面的径向分布规律,对黑角珊瑚进行年代学研究。结果表明,210 Pb 在珊瑚骨骼中的比活度随径向呈指数衰减,各样品中210 Pb 的比活度范围分别为10.28~73.41 mBq/g (JYI-1),1.50~4.72 mBq/g (JYI-2)和5.35~12.67 mBq/g (LHT)。这些黑角珊瑚物种都表现出了生长缓慢、生长周期长的特性。它们持续生长了约185~267 a,年生长率介于17.8~26.5μm/a。而且,年生长率在不同种属、不同区域的样品间有明显区别,生长速率的顺序为：西沙(JYI-2)>西沙(JYI-1)>鹿回头(LHT)。放射性核素210 Pb 对南海黑角珊瑚定年结果与生长环计数的定年结果基本一致。这种黑角珊瑚定年方法可以为其在百年尺度上研究气候环境的演变和重建提供基础数据。
통과고분변저본저적α능보검측기술대채자남해서사군도(JYI-1、JYI-2)화록회두반도(LHT)삼주흑각산호골격중적210 Pb 진행료측정,이용과잉210 Pb 비활도재산호횡절면적경향분포규률,대흑각산호진행년대학연구。결과표명,210 Pb 재산호골격중적비활도수경향정지수쇠감,각양품중210 Pb 적비활도범위분별위10.28~73.41 mBq/g (JYI-1),1.50~4.72 mBq/g (JYI-2)화5.35~12.67 mBq/g (LHT)。저사흑각산호물충도표현출료생장완만、생장주기장적특성。타문지속생장료약185~267 a,년생장솔개우17.8~26.5μm/a。이차,년생장솔재불동충속、불동구역적양품간유명현구별,생장속솔적순서위：서사(JYI-2)>서사(JYI-1)>록회두(LHT)。방사성핵소210 Pb 대남해흑각산호정년결과여생장배계수적정년결과기본일치。저충흑각산호정년방법가이위기재백년척도상연구기후배경적연변화중건제공기출수거。
In this study,theαspectrometry technology was used to estimate the activities of 2 1 0 Pb in the skeletons of black corals collected from the Xisha Islands (JYI-1,JYI-2 )and Luhuitou Peninsula (LHT)of the South China Sea.According to the radial distribution characteristics of excess 2 1 0 Pb in the cross-sections of black corals,we studied the chronology of black corals.The results reveal that specific activity of 2 1 0 Pb exhibits an exponential decrease with distance from the edge of the black corals.The ranges of 2 1 0 Pb specific activity in the coral skeleton are 10.28-73.41 mBq/g,1.50-4.72 mBq/g and 5.35-12.67 mBq/g in the JYI-1,JYI-2 and LHT respectively.All black corals are long-lived and slow-growing organisms.They have been growing continuously for 185-267 a,with growth rates ranging from 17.8 to 26.5 μm/a.Moreover,the annual growth rates exhibit obvious distinction in diverse species collected from different regions.The sequence of the growth rate is JYI-2 >JYI-1>LHT.With respect to counting growing rings,the results of radionuclide 2 1 0 Pb in dating of black corals reveal a good conformity.The dating of black corals in this study will provide the basic data to study the evolution and reconstruction of climate change in the past centuries.