软体动物中的碳储存:陆地生态系统中一个被忽视但重要的碳沉积点
Yajie Dong1, Naiqin Wu2, Fengjiang Li3
1Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China.
The Science of the total environment
|January 13, 2024
概括
软体动物的贝显著储存碳,为中国的陆地碳汇贡献了1.68-2.71%. 这种外碳沉积至少持续了2万年,提供了大量的,被忽视的碳储存机制.
科学领域:
- 地质化学 地质化学
- 古气候学 古气候学
- 生态生态学 生态生态学
背景情况:
- 软体动物构成了第二大动物类,在全球范围内居住在多样化的生态系统中.
- 软体动物的外是由碳酸组成的,碳酸是一个重要的碳沉.
- 陆地软体动物对碳捕获的定量贡献在很大程度上尚未评估.
研究的目的:
- 量化中国各种生态系统中现代陆地软体动物中的碳沉积量.
- 为了估计过去2万年来在软体动物中储存的历史碳流量.
- 评估软体动物外碳沉积在中国陆地碳预算中的重要性.
主要方法:
- 来自中国470个现代地表土壤地点的软体动物的实地采样.
- 地质统计分析以估计不同土地使用类型的外碳总沉积量.
- 分析了来自洛斯矿床的十多个化石序列,以重建过去的碳流.
主要成果:
- 中国的现代陆地软体动物表现出碳沉积率因生态系统而异,在落叶宽叶森林和灌木中,碳沉积率更高.
- 据估计,中国的外碳总沉积量在3.39-5.45 × 10^6 t C yr-1之间,占全国陆地碳汇的1.68-2.71%.
- 对沉积物的分析显示,在过去的2万年中,持续且大量的外碳沉积,全球估计达到1.29 × 10^9t C.
结论:
- 陆地软体动物的贝代表着一个重要的和历史上持久的碳汇.
- 这些发现突出了全球碳循环的一个被忽视的组成部分,这对于准确的气候建模至关重要.
- 软体动物的碳储存提供了一个与大规模植树努力相提并论的自然机制.
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