Effects of geological conditions and atmospheric deposition on soil biogeochemical properties in Japanese forested ecosystems revealed by Sr isotope analysis
Effects of geological conditions and atmospheric deposition on soil biogeochemical properties in Japanese forested ecosystems revealed by Sr isotope analysis
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DOI：
10.1007/s10533-022-00991-z
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发表时间：
2022-11
期刊：
影响因子：
4
通讯作者：
R. Urakawa;T. Ohta;K. Shin;H. Sase;H. Shibata;Takaya Chikamasa;T. Nakano
中科院分区：
文献类型：
--
作者：
R. Urakawa;T. Ohta;K. Shin;H. Sase;H. Shibata;Takaya Chikamasa;T. Nakano
放射成因锶同位素比值（87 Sr/86 Sr）是生态系统中阳离子动态的重要示踪剂，可作为地质条件和大气沉降的代用指标。在这项研究中，测量了从日本42个森林生态系统收集的凋落物和土壤中的87 Sr/86 Sr，以评估地质条件和大气沉降等各种环境因素的影响，87Sr/以碎屑岩和燧石为成土母质且地质年代较老的样地，凋落物中有机结合态Sr的~（86）Sr含量较高地质年代相对年轻的火成岩。此外，87 Sr/86 Sr的有机结合Sr在凋落物是较高的，在日本海附近的网站，由于海盐和跨界风尘与硅酸盐矿物来自中国沙漠通过冬季风。路径模型分析表明，地质和大气沉降的凋落物和土壤87 Sr/86 Sr的地理分布显着的解释变量。第二个路径建模分析，将现有的数据集在以前的研究中发现的间接和显着的关联地质条件和大气沉积与土壤酸度和碱阳离子浓度通过凋落物和土壤87 Sr/86 Sr。因此，在日本森林生态系统中的土壤酸化和矿物性质的间接影响母质风化和大气沉积，包括远距离越境大气沉积，如凋落物和土壤87 Sr/86 Sr。
The radiogenic strontium (Sr) isotope ratio (87Sr/86Sr) is a valuable tracer of cation dynamics in ecosystems, and has been used as a proxy for geological conditions and atmospheric deposition. In this study,87Sr/86Sr was measured in litter and soil collected from 42 forest ecosystems in Japan to assess the effects of various environmental factors, such as geological conditions and atmospheric deposition, on soil biogeochemical properties.87Sr/86Sr in organically bound Sr in the litter was higher at sites with soil parent materials of clastic rocks and chert whose geological age was older than that of the sites with igneous rocks, whose geological age was relatively young. In addition,87Sr/86Sr in organically bound Sr in litter was higher at sites near the Sea of Japan due to the sea salt and transboundary eolian dust with silicate minerals originating from the Chinese desert via the winter monsoon. Path modeling analysis revealed that geology and atmospheric deposition were significant explanatory variables for the geographical distribution of litter and soil87Sr/86Sr. A second path modeling analysis incorporating an existing dataset obtained in a previous study revealed an indirect and significant association of geological conditions and atmospheric deposition with soil acidity and base cation concentration through litter and soil87Sr/86Sr. Consequently, soil acidification and mineral properties in Japanese forest ecosystems are indirectly affected by parent material weathering and atmospheric deposition, including long-range transboundary atmospheric deposition, as indicated by litter and soil87Sr/86Sr.