贺兰山西坡不同海拔梯度土壤氨基糖积累特征  

Characteristics of soil amino sugars accumulation at different elevation gradients on the western slope of Helan Mountain

作　　者：赵娅茹 吴梦瑶 袁丽丽 王晓勤 杨娟[2] 陈林[1] 李学斌[1] 周金星[3] 万龙 庞丹波 ZHAO Yaru;WU Mengyao;YUAN Lili;WANG Xiaoqin;YANG Juan;CHEN Lin;LI Xuebin;ZHOU Jinxing;WAN Long;PANG Danbo(Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education,Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China,Ningxia University,Yinchuan 750021,China;School of Forestry and Grassland,Ningxia University,Yinchuan 750021,China;National Orientation Observation and Research Station of Yunnan Jianshui Desert Ecosystem,School of Soil and Water Conservation,Key Laboratory of National Forestry and Grassland Administration on Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Administration of Helan Mountain National Nature Reserve Inner Mongolia,Alxa Left Banner 750306,China)

机构地区：[1]宁夏大学生态环境学院,西北土地退化与生态恢复国家重点实验室培育基地,西北退化生态系统恢复与重建教育部重点实验室,宁夏贺兰山森林生态系统国家定位观测研究站,银川750021 [2]宁夏大学林业与草业学院,银川750021 [3]北京林业大学水土保持学院云南建水荒漠生态系统国家定位观测研究站,北京林业大学水土保持国家林业和草原局重点实验室,北京100083 [4]内蒙古贺兰山国家级自然保护区管理局,阿拉善左旗750306

出　　处：《生态学报》2024年第7期2907-2918,共12页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(32201631);宁夏重点研发计划项目(2022BSB03069,2021BEG02005);宁夏贺兰山森林生态系统研究平台建设基金项目(2022FRD05001)。

摘　　要：为探明旱区山地不同海拔梯度土壤氨基糖积累特征,明确氨基糖对土壤有机碳库的贡献以及影响因素。以2021年8月在贺兰山西坡不同海拔(1848—2940 m)采集的土壤为研究对象,分析土壤理化性质、微生物群落结构、氨基糖含量、氨基糖对土壤有机碳贡献变化特征以及引起该变化的驱动因素。结果表明:沿海拔梯度上升,土壤理化性质表现出显著差异,土壤含水率、有机碳、全氮表现为升高趋势,pH和容重表现为降低趋势,全磷无明显变化规律。沿海拔梯度上升,土壤真菌、细菌、放线菌以及丛枝菌根真菌磷脂脂肪酸(Phospholipid fatty acids, PLFAs)含量表现为先增加后减少的趋势,在中海拔区域(2110—2360 m)微生物PLFAs含量更高。沿海拔梯度上升,总氨基糖含量和氨基糖单体(氨基葡萄糖、氨基半乳糖、胞壁酸和氨基甘露糖)分别表现为持续增加和先减少后增加的变化趋势,并且总氨基糖和氨基糖单体含量均在最高海拔达到峰值,中海拔区域真菌和细菌残体碳对土壤有机碳的贡献率均小于高海拔(2707—2940 m)和低海拔(1848—1910 m),且在不同海拔梯度上真菌残体碳对土壤有机碳贡献率占据主导地位。方差分解结果显示,土壤理化性质和微生物PLFAs含量共同解释了土壤氨基糖含量及对有机碳贡献率的55.2%,其中土壤理化性质解释变异的52.9%,微生物PLFAs含量解释变异的26.9%,冗余分析同步验证土壤理化性质是影响氨基糖及氨基糖对土壤有机碳贡献率的主要因素。本研究结果揭示了贺兰山西坡微生物驱动土壤有机碳存储与转化机制,可为进一步研究旱区山地微生物残体对土壤有机碳的贡献提供理论依据。This study aims to investigate the characteristics of soil amino sugar accumulation along different altitudinal gradients in arid mountainous regions and elucidate the contributions of amino sugars to the soil organic carbon pool and the factors influencing them.The research focuses on the soils of the western slope of Helan Mountain,ranging from 1848 to 2940 meters in altitude.The soil collected at different elevations(1848—2940 m)on the west slope of Helan Moutain in August 2021 was used as the research object.The analysis includes the examination of soil physicochemical properties,microbial community structure,amino sugar content,variations in the contribution of amino sugars to soil organic carbon,and the driving factors behind these changes.The results indicate significant differences in soil physicochemical properties with increasing altitudes.Soil moisture content,organic carbon,and total nitrogen show an increasing trend,while pH and bulk density exhibit a decreasing trend,and total phosphorus does not show a consistent pattern of change.Along the altitudinal gradient,the contents of soil fungi,bacteria,actinomycetes,and arbuscular mycorrhizal fungi phospholipid fatty acids(PLFAs)initially increase and then decrease,with higher microbial PLFAs contents observed in the mid⁃altitude range(2110—2360 m).The total amino sugar content and individual amino sugar monomers(Glucosamine,Galactosamine,Muramic acid,and Mannosamine)exhibit continuous increase and a decrease followed by an increase,respectively,along the altitudinal gradient.The highest altitude corresponds to the peaks in both total amino sugar content and individual amino sugar monomer content.In the mid⁃altitude range,the contribution of fungal and bacterial residue carbon to soil organic carbon is lower compared to the low⁃altitude range(1848—1910 m)and the high⁃altitude range(2707—2940 m).Furthermore,fungal residue carbon plays a dominant role in the contribution to soil organic carbon at different altitudinal gradients.Variance dec

关 键 词：海拔梯度 微生物群落 土壤有机碳 氨基糖 贺兰山 

分 类 号：S153.6[农业科学—土壤学]