文献类型：期刊文献

英文题名：Stoichiometry and drivers of soil C, N, P and K in the Otindag Sandy Land, northern China

作者：Gan, Honghao[1] Yang, Hongxiao[2] Chu, Jianmin[1,3] Li, Yifu[4] Fang, Kai[1] Zhang, Qi[1] Sun, Jia[1]

第一作者：甘红豪

通信作者：Chu, JM[1];Chu, JM[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Coastal Forestry Res Ctr, Natl Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Qingdao Agr Univ, Coll Resources & Environm, Qingdao 266109, Shandong, Peoples R China;[3]Chinese Acad Forestry, Expt Ctr Desert Forestry, Bayannur 015200, Inner Mongolia, Peoples R China;[4]Henan Polytech Univ, Sch Surveying & Land Informat Engn, Jiaozuo 454003, Henan, Peoples R China

年份：2025

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-105024907376);WOS:【SCI-EXPANDED(收录号:WOS:001638817500001)】；

基金：This work was supported by the National Project on Science and Technology Basic Resources Survey of China (No. 2017FY100205).

语种：英文

外文关键词：Stoichiometry; Climatic factors; Vegetation factors; Geography; Otindag Sandy Land

摘要：Aims Soil stoichiometry serves as a critical framework for elucidating nutrient cycling, ecosystem dynamics and biogeochemical processes. However, the mechanisms governing the stoichiometry of topsoil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP) and total potassium (TK) in response to climatic, vegetation, soil texture and geographic variables in the Otindag Sandy Land remain poorly characterized. Methods Concentrations and stoichiometric ratios of SOC, TN, TP and TK in topsoil (0-20 cm) were quantified from 60 plots. The influences of potential driving factors were analyzed utilizing analysis of variance (ANOVA), Tukey's post hoc test, linear regression, redundancy analysis (RDA), Pearson's correlation, canonical analysis and structural equation modeling (SEM). Results Thesoils in the Otindag Sandy Land presented low SOC (2.30 mgg(-1)), TN (0.23 mgg(-1)) and TP (0.13 mgg(-1)) concentrations, and low stoichiometric ratios (SOC: TN = 9.59, SOC: TP = 17.49, SOC: TK = 0.09, TN: TP = 1.75, TN: TK = 0.01 and TP: TK = 0.01). These results showed significant spatial variability (P < 0.05). Climate and vegetation are the main determinants of SOC, TN, TP and TK stoichiometry. Conclusions Geographic variables, specifically longitude (LON) and elevation (ELE), indirectly regulate the stoichiometry of SOC, TN, TP, and/or TK by affecting climate, soil texture, and/or vegetation. Our findings enhance the understanding of how climate change impacts topsoil stoichiometry in the Otindag Sandy Land and provide insights to support ecological restoration in this region.