石笋P/Ca重建宜昌地区9 000年以来的陆地生产力

陈菲菲; 胡超涌; 史 郁; 阮骄杨

doi:10.3969/j.issn.1001-4810.2010.03.010

石笋P/Ca重建宜昌地区9 000年以来的陆地生产力

doi: 10.3969/j.issn.1001-4810.2010.03.010

中国地质大学（武汉）生物地质与环境地质教育部重点实验室

基金项目: 国家自然科学基金重点项目（批准号：40531004）资助

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出版历程
- 收稿日期: 2010-08-05
- 发布日期: 2010-09-25

Reconstruction of terrestrial productivity of Yichang region in the past 9000 years from stalagmite P/Ca ratio

Key Laboratory of Biogeology and Environmental Geology, Ministry of Education, China University of Geology

摘要

摘要: 陆地生产力在全球变化，尤其是全球碳循环研究领域中，具有重要的地位。本文通过分析湖北清江和尚洞HS4石笋中P和Ca的地球化学组成，考察P/Ca对陆地生物生产力的响应。结果发现，最近50年沉积的石笋P/Ca比值与Thornthwaite Memorial生产力模型计算的区域陆地生产力具有显著的相关性，可以作为陆地古生产力的指标。以石笋P/Ca 重建的宜昌地区陆地古生产力在过去9 000年呈现波动变化的特征：8.9～6.5ka BP，陆地生产力较低；6.5～5.0ka BP，陆地生产力显著升高，并在6.4～5.6ka BP期间达到9.0ka来的最高值；5.0～4.0ka BP，处于低生产力期；4.0～1.5ka BP，生产力逐渐回升；1.5ka BP以来，生产力再次处于低值期。陆地生产力的波动明显受到全球和区域气候的制约。
- 石笋 /
- P/Ca比值 /
- 陆地生产力 /
- 宜昌地区
Abstract: Terrestrial productivity plays an important role in the field of global change research, especially in global carbon recycling research. In this paper, geochemical composition of P and Ca in stalagmite HS4 from Heshang Cave, Qingjiang, Hubei Province is analyzed to investigate the response of stalagmite P/Ca ratio to the terrestrial productivity. The results prove that the P/Ca recorded in the spleothem in recent 50 years is significantly correlated with the local terrestrial productivity calculated by Thornthwaite Memorial Productivity Model, which implying stalagmite P/Ca may be the index for local terrestrial paleo-productivity. Based on P/Ca in the stalagmite HS4, regional paleo-productivity in Yichang are reconstructed. It is found that terrestrial productivity fluctuated during the past 9 000 years, which was low in 8.9ka～6.5ka BP, increased significantly during 6.5ka～5.0ka BP, and reached the top in 6.4ka～5.6kaBP, then fell to a low lever in 5.0ka～4.0ka BP; and increased gradually in 4.0ka～1.5ka BP, and after 1.5kaBP, lowered again. The fluctuation of terrestrial productivity is obviously constrained by global and regional climate.
- stalagmite /
- P/Ca ratio /
- terrestrial productivity /
- Yichang region

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