Precipitation delta O-18 Recorded by the alpha-Cellulose delta O-18 of Plant Residues in Surface Soils: Evidence From a Broad Environmental Gradient in Inland China
Precipitation delta O-18 Recorded by the alpha-Cellulose delta O-18 of Plant Residues in Surface Soils: Evidence From a Broad Environmental Gradient in Inland China
复制标题
表层土壤中植物残留物的α-纤维素δ O-18 记录的降水δ O-18：来自中国内陆大环境梯度的证据
DOI：
10.1029/2019gb006418
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Sun Weizhen
中科院分区：
文献类型：
--
作者：
Shi Fuxi;Rao Zhiguo;Li Yunxia;Cao Jiantao;Shi Xiaoyi;Li Chaozhu;Sun Weizhen
为了确定生态系统水平上多种陆地植物物种的 α-纤维素 δ18O (δ18Ocell) 数据记录降水 δ18O 数据 (δ18Op) 的潜力，特别是在相对寒冷和干旱的环境中，我们从覆盖大环境梯度（纬度~29°N 至 51°N，纬度~81°N）的 104 个表层土壤中收集了陆地植物残留物样本。 东经 124°，海拔约 200 至 5,100 分钟），位于中国内地。尽管广阔的研究区域内植被类型多样，气候条件多样，生物地球化学过程可能很复杂，但 δ18Ocell.data 显示出与 δ18Op 相似的空间格局。结果表明，δ18Ocell 数据的测量值有可能记录δ18Op 的变化。进一步分析表明，青藏高原δ18Ocell数据主要受水分源控制。有趣的是，δ18Ocell/δ18Op与青藏高原海拔高度呈显着负相关，这意味着δ18Ocell在该地区进行古海拔测量的潜力。中国北部地区（包括东亚季风边缘和中亚干旱地区）的δ18Ocell数据主要受温度控制，但该地区相对湿度的影响也不容忽视。我们的研究结果为δ18Ocell相关研究提供了基础参考，旨在提高我们对中国内陆及其他地区环境、水文和气候变化的了解。
In order to determine the potential of α‐cellulose δ18O (δ18Ocell) data from multiple terrestrial plant species on an ecosystem level to record the δ18O data of precipitation (δ18Op), especially in relatively cold and arid environments, we collected samples of terrestrial plant residues from 104 surface soils covering a large environmental gradient (~29 to 51°N in latitude, ~81 to 124°E in longitude, ~200 to 5,100min elevation) in inland China. Despite the diverse vegetation types, wide range of climatic conditions and potentially complex biogeochemical processes operating within the vast study region, the δ18Ocell.data show a similar spatial pattern to that of δ18Op. The results demonstrate that the measured values of δ18Ocell data have the potential to record variations in δ18Op. Further analysis indicated that the δ18Ocell data from the Tibetan Plateau were primarily controlled by the moisture sources. Interestingly, there are significant negative correlations between δ18Ocell/δ18Op and altitude on the Tibetan Plateau, implying the potential of δ18Ocell for paleoaltimetry in this region. The δ18Ocell data from the northern region of China (including the East Asian monsoon‐margin and arid central Asia) were mainly controlled by temperature, although the influence of relative humidity in the region is not negligible. Our results provide a fundamental reference for related δ18Ocell studies aimed to improve our understanding of environmental, hydrological, and climatic changes in inland China and elsewhere.