摘要
昆仑山的高海拔梯度使该地区的气候和植被类型呈现出明显的垂直分布特征,因此成为研究山地生态系统土壤养分和生态化学计量特征的重要区域。但关于昆仑山整体尺度上的不同海拔梯度的土壤养分和生态化学计量特征及其驱动因素的研究仍不充分。通过采集昆仑山1916—4335 m范围内不同海拔梯度的土壤样品,分析0—50 cm土层土壤有机碳、全氮、全磷含量及其生态化学计量特征,探讨昆仑山土壤有机碳、全氮、全磷含量和生态化学计量特征随海拔梯度的变化规律,通过分析土壤全盐量、pH、坡向、坡度、植物群落盖度、群落高度及气候因子与土壤有机碳、全氮、全磷含量和生态化学计量特征的关系,探讨昆仑山土壤有机碳、全氮、全磷含量和生态化学计量特征形成的驱动因素。研究结果表明:(1)昆仑山地区土壤有机碳、全氮、全磷含量均随海拔梯度的上升呈显著增加趋势,但全磷含量随海拔的变化较小,上升趋势缓慢;土壤碳氮比不随海拔梯度的变化而变化,土壤碳磷比和氮磷比随海拔梯度的上升呈显著增加趋势。(2)昆仑山地区土壤有机碳、全氮含量主要受最热月份最高温度、最干季度降水量、气温季节性变动系数和群落盖度的影响,而土壤全磷含量主要受土壤全盐量、坡度、最湿季度均温和最热月份最高温度的影响。(3)昆仑山地区土壤碳氮比主要受群落高度和最干季度降水量的影响,土壤碳磷比、氮磷比主要受气温季节性变动系数、最干季度降水量和群落盖度影响。研究结果为进一步认识山地生态系统的土壤碳、氮、磷生物化学循环特征奠定基础,有助于更准确地预测山地生态系统如何应对持续的气候变化。
The high⁃altitude gradients of the Kunlun Mountains create distinct vertical zonation in climate and vegetation types,making this region a critical area for studying soil nutrients and ecological stoichiometry in mountain ecosystems.However,research on soil nutrients and ecological stoichiometry across different altitude gradients at the whole⁃scale of the Kunlun Mountains,as well as their driving factors,remains insufficient.This study collected soil samples from different altitude gradients(1916 m to 4335 m)in the Kunlun Mountains and analyzed the content of soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)in the 0—50 cm soil layer,as well as their ecological stoichiometric characteristics,the main objective was to explore how the contents of SOC,TN,TP,and their ecological stoichiometric characteristics varied with the altitude gradient in the Kunlun Mountains,aiming to reveal the underlying patterns of these changes across different elevations.Additionally,this study analyzed the relationships between total soil salinity content,pH,aspect,slope,plant community coverage,community height,and climate factors with SOC,TN,TP contents and ecological stoichiometric characteristics to investigate the driving factors for the formation of SOC,TN,TP contents and ecological stoichiometric characteristics in the Kunlun Mountains.The results showed that:(1)In the Kunlun Mountains region,SOC,TN,and TP contents significantly increased with altitude,although the change in TP content with altitude was relatively small,showing a slow increase.The soil C∶N ratio remained stable with altitude,while the C∶P and N∶P ratios significantly increased as altitude rose.(2)In the Kunlun Mountains region,SOC and TN contents were primarily influenced by the maximum temperature in the hottest month,the precipitation of driest quarter,the seasonal temperature variation coefficient,and plant community coverage,while TP content was mainly affected by total soil salinity content,slope,the mean temperature of wettest quarter and the maximum temperature in the hottest month.(3)In the Kunlun Mountains region,The soil C∶N ratio was mainly affected by plant community height and the precipitation of driest quarter,while the C∶P and N∶P ratios were primarily influenced by the seasonal temperature variation coefficient,the precipitation of driest quarter and plant community coverage.The findings establish an important scientific foundation for understanding carbon⁃nitrogen⁃phosphorus cycling processes in high⁃altitude environments and contribute to better predicting how these fragile mountain ecosystems might respond to ongoing climate change.
作者
刘宝迪
白其格那
赵利清
辛玥
要振宇
扈凡斌
杨延登
清华
张迎黎
LIU Baodi;BAI Qigena;ZHAO Liqing;XIN Yue;YAO Zhenyu;HU Fanbin;YANG Yandeng;QING Hua;ZHANG Yingli(Inner Mongolia Key Laboratory of Grassland Ecology,School of Ecology and Environment,Inner Mongolia University,Hohhot 010021,China;Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau,Inner Mongolia University,Hohhot 010021,China;Ulanqab Science and Technology Development Center,Ulanqab 012000,China)
出处
《生态学报》
北大核心
2025年第16期7995-8006,共12页
Acta Ecologica Sinica
基金
第二次青藏高原综合科学考察研究(2019QZKK0301)。
关键词
昆仑山
土壤养分
海拔梯度
生态化学计量
Kunlun Mountains
soil nutrients
altitude gradient
ecological stoichiometry
