School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, 014000, China.
Autonomous Region Level Ecological Protection and Comprehensive Utilization Cooperative Innovation Center for the Inner Mongolia Section of the Yellow River Basin, Baotou, 014000, China.
Environ Sci Pollut Res Int. 2024 Apr;31(17):25147-25162. doi: 10.1007/s11356-024-32798-w. Epub 2024 Mar 11.
The comparative study of the transformation among sediment phosphorus (P) fractions in different lake types is a global issue in lake ecosystems. However, interactions between sediment P fractions, environmental factors, and microorganisms vary with the nutrient status of lakes. In this study, we combine sequential extraction and metagenomics sequencing to assess the characteristics of P fractions and transformation in sediments from different lake types in the Inner Mongolian section of the Yellow River Basin. We then further explore the response of relevant microbial and environmental drivers to P fraction transformation and bioavailability in sediments. The sediments of all three lakes exhibited strong exogenous pollution input characteristics, and higher nutritional conditions led to enhanced sediment P fraction transformation ability. The transformation capacity of the sediment P fractions also differed among the different lake types at the same latitudes, which is affected by many factors such as lake environmental factors and microorganisms. Different drivers reflected the mutual control of weakly adsorbed phosphorus (WA-P), potential active phosphorus (PA-P), Fe/Al-bound phosphorus (NaOH-P), and Ca-bound phosphorus (HCl-P) with the bio-directly available phosphorus (Bio-P). The transformation of NaOH-P in reducing environments can improve P bioavailability, while HCl-P is not easily bioavailable in weakly alkaline environments. There were significant differences in the bacterial community diversity and composition between the different lake types at the same latitude (p < 0.05), and the role of P fractions was stronger in the sediments of lakes with rich biodiversity than in poor biodiversity. Lake eutrophication recovery was somewhat hindered by the microbial interactions of P cycling and P fractions within the sediment. This study provides data and theoretical support for exploring the commonalities and differences among different lake types in the Inner Mongolian section of the Yellow River Basin. Besides, it is representative and typical for promoting the optimization of ecological security patterns in ecologically fragile watersheds.
不同类型湖泊沉积物磷（P）形态转化的比较研究是全球湖泊生态系统的一个热点问题。然而，沉积物 P 形态之间的相互作用、环境因子与微生物随湖泊营养状态的不同而变化。本研究采用连续提取法与宏基因组测序相结合的方法，评估了黄河内蒙段不同类型湖泊沉积物中 P 形态特征及其转化规律，并进一步探讨了相关微生物与环境因子对沉积物 P 形态转化与生物有效性的响应。三湖沉积物均表现出较强的外源污染输入特征，较高的营养条件导致沉积物 P 形态转化能力增强。同一纬度不同类型湖泊的沉积物 P 形态转化能力存在差异，这受到湖泊环境因子和微生物等多种因素的影响。不同驱动因素反映了弱吸附态磷（WA-P）、潜在活性磷（PA-P）、铁/铝结合态磷（NaOH-P）和钙结合态磷（HCl-P）与生物直接有效磷（Bio-P）之间的相互控制关系。在还原环境中，NaOH-P 的转化可以提高 P 的生物有效性，而在弱碱性环境中 HCl-P 不易生物有效性。同一纬度不同类型湖泊的细菌群落多样性和组成存在显著差异（p<0.05），富生物多样性湖泊沉积物中 P 形态的作用强于贫生物多样性湖泊。湖泊富营养化恢复受到了 P 循环和沉积物 P 形态微生物相互作用的一定阻碍。本研究为探索黄河内蒙段不同类型湖泊的共性与差异提供了数据和理论支持，同时对促进生态脆弱流域生态安全格局的优化具有代表性和典型性。
