环渤海湿地沉积物球囊霉素相关土壤蛋白分布特征及其对湿地土壤风化的影响

周攀; 叶思源; 王锦; 于长斌; 袁红明; 裴理鑫; 丁喜桂; 杨娟; HANSBrix

doi:10.12029/gc20220404

环渤海湿地沉积物球囊霉素相关土壤蛋白分布特征及其对湿地土壤风化的影响

Glomalin-related soil protein distribution and its relation to mineral weathering in the wetlands along the Bohai Sea, China

摘要

摘要:
研究目的 球囊霉素作为丛枝菌根真菌(AMF)分泌的一种难降解土壤蛋白, 广泛分布于陆地生态系统中, 是长期碳贮的重要组成。当前鲜有研究涉及其在滨海湿地中的分布。基于此, 本文对中国环渤海主要滨海湿地表层沉积物中球囊霉素相关土壤蛋白(GRSP)的空间分布进行表征, 探讨不同湿地生境下GRSP分布及其对沉积物风化的指示意义。
研究方法 本文选取辽河三角洲、北大港和黄河三角洲湿地作为研究区, 对166个表层样(0~5 cm)和4个柱状样(0~35 cm)的GRSP、粒度以及常量元素进行测定, 并计算化学蚀变系数(CIA)。
研究结果 研究区GRSP在空间上的动态变化受植被类型影响显著, 范围在0.06~11.31 mg/g, 均值为(2.35±0.16) mg/g; 沉积物以粉砂质砂和砂为主, CIA值分布范围为44.79~69.59, 部分区域达到中等化学风化; CIA与GRSP呈显著相关(R=~0.49, p < 0.01), 总体上CIA随GRSP的增加呈现先增加后减少的趋势。
结论 GRSP在滨海湿地沉积物中的分布受到生境差异性的影响, 其与CIA的相关性表征AMF及其代谢产物在地质体风化过程中发挥了潜在的生态功能。

Abstract:
This paper is the result of environmental geological survey engineering.
Objective As a refractory soil protein secreted by arbuscular mycorrhizal fungi (AMF), glomalin-related soil protein (GRSP) is an important component of long-term carbon storage and widely distributed in sediment of terrestrial ecosystem.The distribution of GRSP in coastal wetlands is still not well documented.In this study, the spatial distribution of GRSP in the sediments of the typical wetlands along the Bohai Sea coasts in China were characterized, and the distribution of GRSP in different wetland habitats and its relation to sediment weathering in wetlands were discussed.
Methods Particle size, major elements and GRSPs of 166 surface samples (0-5 cm) and 4 sediment cores (~35 cm long) in the wetlands of the Liaohe delta (LHD), Beidagang Lake (BDG) and Yellow River delta (YRD) were tested, and the corresponding chemical index of alteration (CIA) was calculated.
Results The GRSP in surface sediments were significantly affected by the vegetation types, ranged from 0.06 to 11.31 mg/g, with an average of (2.35± 0.16) mg/g; The sediments in the three study areas were mainly silty sand and sand, the distribution range of CIA values were 44.79-69.59, some areas reached moderate chemical weathering; The concentrations of GRSP were significantly correlated with CIAs (R=~0.49, p < 0.01).In general, CIA increased first with increasing GRSP until the GRSP concentrations reached a certain critical level.
Conclusions The distribution of GRSP concentrations in coastal wetland sediments was affected by habitat differences, and its correlation with CIA indicated that AMF and its metabolites play potential ecological functions during the processes of geological weathering.

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