三种提取态硅在典型滨海湿地中的分布特征及影响因素分析

doi:10.3976/j.issn.1002-4026.20240048

Abstract

Abstract:

As the second most abundant element on earth, silicon plays an important role in soil biogeochemical processes. However, the geochemical characteristics of soil silicon in different forms in coastal wetlands still need further investigation. In this study, we selected four typical coastal wetlands (nonflooding Phragmites australis, tidal P. australis, freshwater P. australis, and tidal Suaeda salsa wetlands) as sampling sites and collected soils from 0 to 20 cm depth. Furthermore, we determined oxalate-extractable silicon, dithionite-citrate-extractable silicon, pyrophosphate-extractable silicon and analyzed their soil physical and chemical properties, distribution patterns, and influencing factors in typical coastal wetlands. Results showed that dithionite-citrate-extractable silicon and pyrophosphate-extractable silicon showed no significant differences among four wetlands (p>0.05), while oxalate-extractable silicon in nonflooding P. australis wetlands was significantly lower than tidal P. australis wetlands (p<0.05). As for the profile distribution, the three types of extractable silicon in soils from 0 to 10 cm were generally higher than in soils from 10 cm to 20 cm. Additionally, the correlation analysis revealed that soil organic matter, total nitrogen, bulk density, pH, silt and moisture were important factors influencing these three types of extractable silicon.

Key words: oxalate-extractable silicon, dithionite-citrate-extractable silicon, pyrophosphate-extractable silicon, geochemical properties, coastal wetlands

CLC Number:

JI Xiaohui, ZHAO Qingqing, ZHAN Haiyin, WANG Jianing, ZHANG Wen, HUANG Yujie, SONG Fanyong, WEI Xiaobing. Distribution patterns and influencing factors of three types of soil extractable silicon in typical coastal wetlands[J].Shandong Science, 2024, 37(5): 95-102.

Figures/Tables 5

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References 20

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理化参数	非淹水芦苇湿地	潮汐芦苇湿地	淡水芦苇湿地	盐地碱蓬湿地
草酸提取硅质量分数/(g·kg^-1)	0.16±0.04b	0.28±0.05a	0.23±0.15ab	0.24±0.10ab
连二硫酸钠-柠檬酸钠提取硅质量分数/(g·kg^-1)	0.55±0.21a	0.76±0.24a	0.58±0.26a	0.73±0.28a
焦磷酸钠提取硅质量分数/(g·kg^-1)	0.27±0.08a	0.33±0.10a	0.31±0.13a	0.34±0.10a
有机质质量分数/%	4.03±0.83b	7.70±1.26a	6.27±4.01ab	5.98±1.69a
总氮质量分数/(g·kg^-1)	0.27±0.03b	0.46±0.04a	0.42±0.26ab	0.36±0.09ab
容重/(g·cm^-3)	1.56±0.02a	1.38±0.09c	1.52±0.03b	1.57±0.08ab
电导率/(mS·cm^-1)	3.18±0.91b	2.76±0.60b	0.52±0.09c	15.51±6.64a
pH	9.09±0.46a	8.39±0.18c	8.65±0.12b	8.56±0.11bc
粉砂粒质量分数/%	5.59±5.22b	22.67±2.94a	15.00±9.17ab	23.75±13.78a
砂粒质量分数/%	94.41±5.22a	77.18±3.14b	84.87±9.30ab	74.28±17.23b
含水质量分数/%	22.06±0.67c	22.96±0.56b	28.31±4.88a	22.84±2.51bc

分析项目	草酸提取态硅质量分数	连二硫酸钠-柠檬酸钠提取态硅质量分数	焦磷酸钠提取态硅质量分数
有机质质量分数	0.860^**	0.602^**	0.722^**
总氮质量分数	0.898^**	0.517^**	0.643^**
容重	-0.337^*	-0.337^*	-0.236
电导率	0.017	0.196	0.159
pH	-0.484^**	-0.562^**	-0.501^**
粉砂粒质量分数	0.652^**	0.614^**	0.535^**
砂粒质量分数	-0.646^**	-0.605^**	-0.527^**
含水率	0.495^**	0.203	0.401^*

Distribution patterns and influencing factors of three types of soil extractable silicon in typical coastal wetlands

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