贺兰山不同海拔土壤团聚体有机碳稳定性  

Stability of organic carbon in soil aggregates at different elevations in Helan Mountain

作　　者：李冰[1,2,3] 庞丹波 陈林 高锋[1,2,3] 吴梦瑶 孙浩楠 李学斌 LI Bing;PANG Danbo;CHEN Lin;GAO Feng;WU Mengyao;SUN Haonan;LI Xuebin(College of Ecological,Ningxia University,Yinchuan 750021,China;Key Laboratory for Restory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Minstry of Education,Ningxia University,Yinchuan 750021,China;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)

机构地区：[1]宁夏大学生态环境学院,银川750021 [2]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川750021 [3]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [4]宁夏大学林业和草业学院,银川750021

出　　处：《生态学报》2024年第24期11241-11253,共13页Acta Ecologica Sinica

基　　金：国家自然科学基金项目(32371964,32360423,32201631);银川市重点研发计划项目(2023SFZD04)。

摘　　要：贺兰山是我国干旱半干旱地区的典型森林生态系统,为了解土壤团聚体稳定性及有机碳组分变化特征随海拔变化的机制,选择贺兰山1300—2700 m范围内的7种典型植被类型,分析不同海拔土壤理化性质、团聚体分布特征及其稳定性、不同粒级团聚体有机碳组分的变化机制,通过相关性热图分析和冗余分析,揭示影响团聚体有机碳变化的驱动因素。结果表明:随着海拔的上升贺兰山水稳性团聚体主要以大团聚体为主(>0.25 mm),大团聚体的含量和团聚体稳定性随海拔上升呈现先增后减的趋势,2249 m的山杨×油松混交处达到最大值。不同海拔各粒级团聚体土壤有机碳含量随着海拔上升逐渐增加,总体上大团聚体内有机碳高于微团聚体内有机碳含量。团聚体有机碳氧化组分各粒级中有机碳含量随着海拔上升逐渐增多,有机碳含量主要储藏在大团聚体内,在2617 m的高山草甸处达到最大值;中高海拔(1968—2617 m)有机碳氧化稳定性显著低于低海拔(1380—1650 m)地区,且大团聚体比微团聚体和粉黏粒中的有机碳容易氧化分解。相关分析表明,土壤有机碳、海拔和全氮是影响有机碳氧化稳定性组分的主要影响因子,各组分因子之间相互制约。冗余分析表明,土壤理化性质及团聚体稳定性系数对有机碳氧化组分的贡献率为62.25%和21.60%。结果揭示了贺兰山不同海拔团聚体稳定性及有机碳组分特征的影响因素,对深入探讨贺兰山有机碳的储存具有重要意义。Helan Mountain is a typical forest ecosystem in the arid and semi⁃arid regions of China.In order to understand the mechanism of different altitudes on the stability of soil agglomerates and the change characteristics of organic carbon fractions with the change of altitude,the present study selected seven typical vegetation types within the range of 1300—2700 m in the Helan Mountain,and analyzed the physicochemical properties of soils,the characteristics of the distribution of the agglomerates and its stability in different elevations,and the mechanism of the change of organic carbon fractions of different grain sizes.We analyzed the physical and chemical properties of soils at different altitudes,the distribution characteristics of aggregates and their stability,and the mechanism of changes in organic carbon fractions in aggregates ofdifferent grain sizes.The study also revealed the driving factors affecting the changes in organic carbon in aggregates throughcorrelation heat map analysis and redundancy analysis.The results showed that the water⁃stable agglomerates in the HelanMountains mainly consisted of large agglomerates(>0.25 mm),and the content of large agglomerates and the stability ofthe agglomerates showed an increasing and then decreasing trend with the rise of altitude,and reached maximum at thepoplar×turquoise hybrid at 2249 m.The results also showed that the organic carbon content and the stability of theagglomerates at different grain sizes at different altitudes showed an increasing and then decreasing trend with the rise ofaltitude.The soil organic carbon content of aggregates at different elevations increased gradually with the rise of elevation,and in general,the organic carbon in large aggregates was higher than that in micro⁃aggregates.The organic carbon oxidizedfraction of agglomerates increased gradually with the rise of altitude,and the organic carbon content was mainly stored inlarge agglomerates,which reached the maximum value at the alpine meadow at 2617 m.The oxidative stability

关 键 词：贺兰山 海拔梯度 团聚体 有机碳氧化组分 

分 类 号：S714.2[农业科学—林学]