氮磷输入对咸盐湖泊沉积物中陆地草源有机质降解的影响  

Effects of Nitrogen and Phosphorus Inputs on the Degradation of Terrestrial Grass Organic Matter in Saline Lake Sediments

作　　者：吴增辉 韩明贤 韩积斌[2] 张西营[2] 祖丽皮亚木·木沙尔 刘永红 杨渐 蒋宏忱 WU Zenghui;HAN Mingxian;HAN Jibin;ZHANG Xiying;Musa Zulpiya;LIU Yonghong;YANG Jian;JIANG Hongchen(State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan,430074,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,830011,China)

机构地区：[1]中国地质大学(武汉),生物地质与环境地质国家重点实验室,湖北武汉430074 [2]中国科学院青海盐湖研究所,青海省盐湖地质与环境重点实验室,青海西宁810008 [3]中国科学院新疆生态与地理研究所,荒漠与绿洲生态国家重点实验室,新疆乌鲁木齐830011

出　　处：《盐湖研究》2025年第2期19-28,共10页Journal of Salt Lake Research

基　　金：国家自然科学基金面上项目(42272356);青海省盐湖地质与环境重点实验室奖励经费(2024-KFKT-A08)。

摘　　要：氮磷输入对咸盐湖泊中陆源有机质降解的影响目前仍不清晰。文章采用微宇宙培养和地质微生物学分析方法,探究无机氮和/或磷输入对不同盐度湖泊(即柴窝堡湖:2.15 g/L,巴里坤湖:74.56 g/L,幻彩湖:103.41 g/L)沉积物中陆源有机质(羊茅草)矿化的影响。结果表明,添加草源有机质实验组的CO_(2)产生速率(1.01~127.52μg C g^(-1)d^(-1))显著(P<0.05)高于不添加任何有机质和氮磷的对照组(0.58~5.05μg C g^(-1)d^(-1))。添加10倍氮和/或磷实验组的CO_(2)产生速率显著低于添加1倍氮和/或磷的实验组。实验样品中CO_(2)产生速率与Bacteroidia、Desulfobulbia及Desulfobacteria的相对丰度呈显著正相关,而与Alphaproteobacteria相对丰度及盐度呈显著负相关。综上,该研究结果为评估陆源有机质和氮磷输入增加对咸盐湖泊碳循环的影响提供了数据基础和理论支撑。At present it is still unclear that the impact of nitrogen(N)and phosphorus(P)inputs on the degradation of terrestrial grass organic matter in saline lake sediments.In this study,the effects of inorganic N and/or P inputs on the mineralization of terrestrial grass organic matter(Festuca ovina)were investigated in the saline lake sediments with different salinities(i.e.,Chaiwopu Lake:2.15 g/L,Balikun Lake:74.56 g/L,Huancaihu Lake:103.41 g/L),through microcosm incubations and geomicrobiological analyses.The results showed that the CO_(2) production rates of the studied samples with grass organic matter additions(1.01~127.52μg C g^(-1)d^(-1))were significantly higher(P<0.05)than those of the controlling samples without grass organic matter additions(0.58~5.05μg C g^(-1)d^(-1)).The CO_(2) production rates in the experimental samples with tenfold additions of N and/or P(2.54~97.96μg C g^(-1)d^(-1))were significantly lower than those in the experimental samples with one-fold additions of N and/or P(2.45~99.95μg C g^(-1)d^(-1)).The CO_(2) production rates in the studied samples were positively correlated with the relative abundances of Bacteroidia,Desulfobulbia,and Desulfobacteria,but negatively correlated with salinity and the relative abundance of Alphaproteobacteria.Overall,our findings provide data base and theoretical support for assessing the impacts of increased input of terrigenous organic matter and N/P on the carbon cycle of saline lakes.

关 键 词：咸盐湖泊 沉积物 氮磷输入 有机质矿化 微生物群落 

分 类 号：P951[天文地球—自然地理学]