bd93299780ad7d13524260e965683e71 Min_a2023v13n4p483.pdf e26d64b26b06a0f8f94605a19ba8b09b110dd3bf Min_a2023v13n4p483.pdf 6d7fec0771fc0c9ca009fe252f7458c360a692738a187fd9e5b18041b53bae84 Min_a2023v13n4p483.pdf Title: C, N, and P Stoichiometry Characteristics of Fresh and Weathered Sandstones in Longhushan Area, SE China Subject: Carbon (C), nitrogen (N), and phosphorus (P) stoichiometry and their allometric relationships in soil and plants are hot topics that attract a lot of attention, while those rocks that form soils are often neglected. Weathering is a common geological phenomenon that may significantly influence the nutrient composition and release of nutrients from rock and its inherent soils. This study presents C, N, and P concentrations data as well as microscope petrological photographs of fresh and weathered sandstones from Longhushan World Geopark in SE China, in an attempt to investigate C, N, and P stoichiometry of rocks before and after weathering and discuss the driving mechanisms. The results show that weathering significantly decreased rock C, C/N, and C/P concentrations, slightly decreased N and N/P concentrations, and slightly increased P concentration. Microscope observations show that fresh sandstones contain calcite, apatite, microplagioclase, and organic matter, while weathered sandstones feature apatite and organic matter. The flexible allometric relationships and mineral changes before and after rock weathering indicate that chemical mechanisms, such as dissolution of carbonate and hydration of microplagioclase, have changed the existence form of C, N, P and, thus, significantly influence rock C, N, and P stoichiometry. This stoichiometry feature can be in turn used to reflect the regulation effect of rock weathering. Keywords: weathering; C N and P stoichiometry; allometric relationship; Danxia landform rocks Author: Yunni Chang, Chaobin Xu, Junting Qiu, Josep Peñuelas, Jordi Sardans, Hanzhao Zeng, Quanlin Zhong and Baoyin Li Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Wed Mar 29 17:30:21 2023 CEST ModDate: Wed Mar 29 17:35:09 2023 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 12 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 2156167 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- TDRRNZ+VnURWPalladioL Type 1 Custom yes yes no 10 0 BNBSVE+URWPalladioL-Bold Type 1 Custom yes yes no 15 0 WLQIZK+URWPalladioL-Roma Type 1 Custom yes yes no 20 0 UKLAIA+URWPalladioL-Ital Type 1 Custom yes yes no 24 0 OLQXYA+TimesNewRomanPS-BoldItalicMT Type 1C WinAnsi yes yes no 42 0 FICJBI+CMSY10 Type 1 Builtin yes 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TrueType WinAnsi yes yes no 262 0 BCDFEE+PalatinoLinotype-Roman TrueType WinAnsi yes yes no 266 0 BCDGEE+PalatinoLinotype-Italic TrueType WinAnsi yes yes no 270 0 BCDHEE+PalatinoLinotype-Italic CID TrueType Identity-H yes yes yes 274 0 BCDIEE+PalatinoLinotype-Roman CID TrueType Identity-H yes yes yes 281 0 BCDJEE+PalatinoLinotype-Bold CID TrueType Identity-H yes yes yes 288 0 Jhove (Rel. 1.28.0, 2023-05-18) Date: 2024-01-23 02:31:37 CET RepresentationInformation: Min_a2023v13n4p483.pdf ReportingModule: PDF-hul, Rel. 1.12.4 (2023-03-16) LastModified: 2024-01-22 19:46:46 CET Size: 2156167 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 476 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: section.1 Item: Title: Study Area Destination: section.2 Item: Title: Materials and Methods Destination: section.3 Children: Item: Title: Sampling Destination: subsection.3.1 Item: Title: Rock Total C, N, and P Concentration Determination Destination: subsection.3.2 Item: Title: Petrological Mineralogical Analysis Destination: subsection.3.3 Item: Title: Data Analyses Destination: subsection.3.4 Item: Title: Results Destination: section.4 Children: Item: Title: Rock Total C, N, and P Concentrations Destination: subsection.4.1 Item: Title: Allometric Relationship of C, N, and P Stoichiometry between Fresh and Weathered Rocks from Longhushan Area Destination: subsection.4.2 Item: Title: Petrology, Mineral Composition Destination: subsection.4.3 Item: Title: Discussion Destination: section.5 Children: Item: Title: C, N, and P Stoichiometry of Fresh and Weathered Rocks Destination: subsection.5.1 Item: Title: Allometric Relationship of Rock C, N, and P Stoichiometry Response to Weathering Destination: subsection.5.2 Item: Title: Driving Mechanism of C, N, and P Stoichiometry and Allometric Relationship during Rock Weathering Destination: subsection.5.3 Item: Title: Conclusions Destination: section.6 Item: Title: References Destination: section.7 Info: Title: C, N, and P Stoichiometry Characteristics of Fresh and Weathered Sandstones in Longhushan Area, SE China Author: Yunni Chang, Chaobin Xu, Junting Qiu, Josep Peñuelas, Jordi Sardans, Hanzhao Zeng, Quanlin Zhong and Baoyin Li Subject: Carbon (C), nitrogen (N), and phosphorus (P) stoichiometry and their allometric relationships in soil and plants are hot topics that attract a lot of attention, while those rocks that form soils are often neglected. Weathering is a common geological phenomenon that may significantly influence the nutrient composition and release of nutrients from rock and its inherent soils. This study presents C, N, and P concentrations data as well as microscope petrological photographs of fresh and weathered sandstones from Longhushan World Geopark in SE China, in an attempt to investigate C, N, and P stoichiometry of rocks before and after weathering and discuss the driving mechanisms. The results show that weathering significantly decreased rock C, C/N, and C/P concentrations, slightly decreased N and N/P concentrations, and slightly increased P concentration. Microscope observations show that fresh sandstones contain calcite, apatite, microplagioclase, and organic matter, while weathered sandstones feature apatite and organic matter. The flexible allometric relationships and mineral changes before and after rock weathering indicate that chemical mechanisms, such as dissolution of carbonate and hydration of microplagioclase, have changed the existence form of C, N, P and, thus, significantly influence rock C, N, and P stoichiometry. This stoichiometry feature can be in turn used to reflect the regulation effect of rock weathering. 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