长江下游沿江湖泊湿地土壤粒径分形特征与有机碳分布——以菜子湖湿地为例
Fractal Characteristics of Soil Particle Size and Organic Carbon Distribution in the Wetlands of the Lower Yangtze River:A Case Study of Caizi Lake Wetland
孙方虎 1苗雨青 2汪勇 3洪炜林 1顾纪祥 1罗浩 1余健 3张平究3
作者信息
- 1. 安徽师范大学地理与旅游学院,安徽芜湖 241002
- 2. 安徽师范大学地理与旅游学院,安徽芜湖 241002;江淮流域地表过程与区域响应安徽省重点实验室,安徽芜湖 241002;环境激素与生殖发育安徽省重点实验室,安徽阜阳 236037
- 3. 安徽师范大学地理与旅游学院,安徽芜湖 241002;江淮流域地表过程与区域响应安徽省重点实验室,安徽芜湖 241002
- 折叠
摘要
研究长江下游沿江湖泊湿地的土壤颗粒组成、分形维数和土壤有机碳变化,有助于了解湿地土壤结构、质量和湿地碳库状况,为湿地生态恢复提供理论依据.结果表明:湖区湿地土壤以粉粒(72.57％～80.16％)为主,属粉壤土,质地较细.土壤有机碳含量(13.62～23.80 g/kg)与黏粒呈显著正相关,与砂粒呈显著负相关.菜子湖湿地土壤单重分形维数主要由黏粒含量来决定,其值从大到小依次为浅水＞底泥＞泥滩＞草滩＞农田.广义维数谱D(q)为反"S"型递减函数,且D0＞D1＞D2,呈非均匀分布;多重分形参数与土壤颗粒相关性显著,但与有机碳相关性不显著,其中细颗粒(粉粒和黏粒)含量对湿地土壤粒径分布多重分形参数有显著影响.研究显示,多重分形参数可揭示菜子湖湿地土壤性质,建议进行湿地植被恢复和改良耕作措施以改善土壤结构.研究结论可为湿地生态恢复和提升湿地土壤碳汇能力以及增加碳库稳定性提供科学参考.
Abstract
This paper conducted study of soil particle composition,fractal characteristics and the changes in soil organic carbon in wetlands along the lower Yangtze River.This study will help understand the wetland soil structure,quality and the status of wetland carbon pools,and provide a theoretical basis for wetland ecological restoration.The results showed that:the wetland soils in the lake area were composed mainly of chalk(72.57％～80.16％),which was a powdery loam with a fine texture.Soil organic carbon content(13.62～23.80 g/kg)was significantly positively correlated with clay grains and negatively correlated with sand grains.The fractal dimension of soil bulk density in Caizi Lake wetland was mainly determined by the content of clay particles,with values ranging from high to low in the order of shallow water＞bottom sediment＞mudflat＞grassflat＞farmland.The generalized dimension spectrum D(q)was a decreasing function of the inverse"S"type,and DO＞D1＞D2,showing an uneven distribution.The correlation between multi-fractal parameters and soil particles was significant,but not so with organic carbon content,where the content of fine particles(powder and sticky particles)had a significant effect on the multiple fractal parameters of soil particle size distribution.The study showed that multiple fractal parameters could reveal the soil properties of the wetland of Caizihu,and suggested that wetland vegetation restoration and improved tillage measures be carried out to improve the soil structure.The conclusions of this study provided scientific references for wetland ecological restoration,aiming to a potential enhancement of wetland soil carbon sink capacity as well as an increase of the stability of carbon pools.
关键词
湿地/土壤颗粒组成/单重分形/多重分形/有机碳Key words
wetland/soil particle composition/fractal/multifractal/soil organic carbon引用本文复制引用
基金项目
安徽省自然科学基金面上项目(2108085MD126)
国家自然科学基金(41601083)
环境激素与生殖发育安徽省重点实验室开放基金(FSKFKT012)
出版年
2024
NETL
NSTL
万方数据