地学前缘 ›› 2023, Vol. 30 ›› Issue (6): 485-492.DOI: 10.13745/j.esf.sf.2022.12.70

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官厅、密云水库上游流域土壤Sr、Mg、Ca对相关气候要素的指示意义

张城钢(), 魏静, 张玉涛, 王苒, 侯召硕, 赵敬轩, 张欣然   

  1. 河北省地质调查院, 河北 石家庄 050000
  • 收稿日期:2022-08-12 修回日期:2022-11-06 出版日期:2023-11-25 发布日期:2023-11-25
  • 作者简介:张城钢(1987—),男,高级工程师,主要从事生态地球化学研究。E-mail: zhchg0311@126.com
  • 基金资助:
    河北省财政厅资助项目(冀财预复[2016]826号)

Soil Sr, Mg, Ca in upstream watersheds of the Guanting and Miyun Reservoirs as climate indicators

ZHANG Chenggang(), WEI Jing, ZHANG Yutao, WANG Ran, HOU Zhaoshuo, ZHAO Jingxuan, ZHANG Xinran   

  1. Hebei Institute of Geological Survey, Shijiazhuang 050000, China
  • Received:2022-08-12 Revised:2022-11-06 Online:2023-11-25 Published:2023-11-25

摘要:

为探索表生环境下土壤Sr、Mg、Ca对降水量(P)、相对湿度(RH)、气温、日照时长等气候要素的指示意义,本文以官厅、密云水库上游流域为例,利用研究区农用地土壤数据和近20年气候资料,采用多元统计分析等方法研究土壤Sr、Mg、Ca与相关气候要素之间的关系,在0.05水平上建立土壤元素比值与相关气候要素的多元线性回归模型:RMg/Ca=-1.68+(3.59×P+12.62×RH)×10-3,调整后复相关系数R2为0.86;RSr/Ca=-3.49×10-2+(4.95×P+47.11×RH)×10-5,调整后复相关系数R2为0.73。模型的拟合优度均较好。研究结果表明:表生环境下土壤Sr、Mg、Ca呈显著正相关,具有相似的地球化学行为或受类似影响机制控制;降水和相对湿度是影响土壤Sr、Mg、Ca元素分布与分配特征的主要气候要素,其中降水影响更为显著,表现出气候环境越湿润土壤元素含量越低、气候环境越干燥元素含量越高的变化特点;土壤Mg/Ca值、Sr/Ca值对相关气候要素亦有较好指示作用,且效果优于Sr、Mg、Ca,一般情况下元素比值高值区往往反映相对湿润气候环境,而低值区往往反映相对干燥气候环境。

关键词: 官厅水库, 密云水库, 表生环境, 土壤, 气候, Mg/Ca, Sr/Ca, 线性回归模型

Abstract:

Taking the upstream watersheds of the Guanting and Miyun Reservoirs as examples, this paper explores the soil Sr, Mg, and Ca as indicators of climatic factors, such as temperature, precipitation (P), relative humidity (RH), and sunshine duration under supergene environments. Using regional soil data from agricultural land and regional climate data from the last 20 years, the relationships between soil Sr, Mg, Ca and climatic factors are investigated via multivariate statistical analysis. At 95% confidence level, best-fitting multiple linear regression models between soil element ratio (RMg/Ca or RSr/Ca) and climatic factors (P and RH) are established. For equation RMg/Ca=-1.68+(3.59×P+12.62×RH)×10-3, the complex correlation coefficient, R2, is 0.86 after outlier adjustment; for equation RSr/Ca=-3.49×10-2+(4.95×P+47.11×RH)×10-5, R2 is 0.73 after outlier adjustment. A strong positive correlation between Sr, Ca, and Mg in soil is observed under supergene environments, suggesting the three elements may have similar geochemical properties and distribution control mechanisms. The main climatic factors that affect their soil distribution are precipitation and relative humidity, with precipitation having a greater impact. Results show that the Sr, Mg, and Ca contents in soil are inversely correlated with ambient humidity, where higher content usually correlates with drier climates, and vice versa. Compared to soil content, Mg/Ca and Sr/Ca ratios in soil are more effective climate indicators, where areas with low ratios often have relatively dry climates, and vice versa.

Key words: Guanting Reservoir, Miyun Reservoir, supergene environment, soil, climate, Mg/Ca ratio, Sr/Ca ratio, linear regression model

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