Spatial Variation and Influencing Factors of Optical Characteristic of Water Extractable Organic Matter in Soils of Urban Grassland Across Climatic Zones in China

IF 1.7 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Aquatic Geochemistry Pub Date : 2023-09-09 DOI:10.1007/s10498-023-09416-1

Baozhu Pan, Siwan Liu, Yitong Ding, Ming Li

{"title":"Spatial Variation and Influencing Factors of Optical Characteristic of Water Extractable Organic Matter in Soils of Urban Grassland Across Climatic Zones in China","authors":"Baozhu Pan, Siwan Liu, Yitong Ding, Ming Li","doi":"10.1007/s10498-023-09416-1","DOIUrl":null,"url":null,"abstract":"<div><p>Dissolved organic matter (DOM) is the most active organic component in terrestrial ecosystems. In this study, 165 soil samples which were dominated by moss were collected from grasslands with similar vegetation in urban residential areas from 55 cities across different climatic zones of China. The water extractable organic matter (WEOM) of samples was analyzed. The results showed that WEOM content ranged from 23.5 to 517.6 mg kg<sup>−1</sup> in the soil samples. Four fluorescent components including two tryptophan-like components (C1 and C4) and two humic-like components (C2 and C3) were identified by excitation–emission matrices combined with parallel factor analysis (EEM-PARAFAC). Proportions of humic-like components (C2 + C3) were 54–66%, which is 1.2–2.0 times of the tryptophan-like component proportion (C1 + C4) for all samples. The proportions of C2 and C3 were highest in the tropical monsoon climate (TroM) zone compared to that in the other climatic zones. Structural equation model and decomposition of variation showed that soil nutrient content was the main contributing factor of soil WEOM. Content Total nitrogen content and mean annual temperature (MAT) were the main factors influencing soil HIX but they had the opposite effects. Our results suggested that increasing soil nutrient content contributed the increase in soil WEOM content, but increasing MAT reduced the humification degree of WEOM.</p></div>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"29 4","pages":"189 - 205"},"PeriodicalIF":1.7000,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Aquatic Geochemistry","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1007/s10498-023-09416-1","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

Dissolved organic matter (DOM) is the most active organic component in terrestrial ecosystems. In this study, 165 soil samples which were dominated by moss were collected from grasslands with similar vegetation in urban residential areas from 55 cities across different climatic zones of China. The water extractable organic matter (WEOM) of samples was analyzed. The results showed that WEOM content ranged from 23.5 to 517.6 mg kg⁻¹ in the soil samples. Four fluorescent components including two tryptophan-like components (C1 and C4) and two humic-like components (C2 and C3) were identified by excitation–emission matrices combined with parallel factor analysis (EEM-PARAFAC). Proportions of humic-like components (C2 + C3) were 54–66%, which is 1.2–2.0 times of the tryptophan-like component proportion (C1 + C4) for all samples. The proportions of C2 and C3 were highest in the tropical monsoon climate (TroM) zone compared to that in the other climatic zones. Structural equation model and decomposition of variation showed that soil nutrient content was the main contributing factor of soil WEOM. Content Total nitrogen content and mean annual temperature (MAT) were the main factors influencing soil HIX but they had the opposite effects. Our results suggested that increasing soil nutrient content contributed the increase in soil WEOM content, but increasing MAT reduced the humification degree of WEOM.

Abstract Image

查看原文本刊更多论文

中国城市草地不同气候带土壤水分可提取有机质光学特征空间分异及影响因素

溶解有机质(DOM)是陆地生态系统中最活跃的有机成分。本研究选取了中国55个城市不同气候带植被相似的城市居住区草地165个土壤样品，以苔藓为主。对样品的水可萃取有机物(WEOM)进行了分析。结果表明，土壤样品中WEOM含量在23.5 ~ 517.6 mg kg−1之间。利用激发-发射矩阵结合平行因子分析(EEM-PARAFAC)鉴定了4种荧光成分，包括2种色氨酸样成分(C1和C4)和2种腐殖质样成分(C2和C3)。腐植酸类成分(C2 + C3)的比例为54 ~ 66%，是色氨酸类成分(C1 + C4)的1.2 ~ 2.0倍。与其他气候带相比，C2和C3在热带季风气候带的比例最高。结构方程模型和变异分解表明，土壤养分含量是土壤WEOM的主要影响因子。全氮含量和年平均温度是影响土壤HIX的主要因子，但对其影响相反。结果表明，土壤养分含量的增加促进了土壤WEOM含量的增加，而MAT的增加则降低了WEOM的腐殖化程度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Aquatic Geochemistry 地学-地球化学与地球物理

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.