秦岭中段太白山以北不同海拔土壤碳·氮·磷生态化学计量特征  

Ecological Stoichiometry Characteristic of Carbon,Nitrogen and Phosphorus at Different Altitudes in North of Taibai Mountain in the Middle Qinling Mountains

作　　者：李丹 范拴喜[1,2] 孙旻涵 黄意成 LI Dan;FAN Shuan-xi;SUN Min-han(Baoji University of Arts and Sciences,Baoji,Shaanxi 721013;Shaanxi Province Key Laboratory of Disaster Monitoring and Mechanism Simulation,Baoji,Shaanxi 721013)

机构地区：[1]宝鸡文理学院,陕西宝鸡721013 [2]陕西省灾害监测与机理模拟重点实验室,陕西宝鸡721013

出　　处：《安徽农业科学》2023年第9期49-52,64,共5页Journal of Anhui Agricultural Sciences

基　　金：陕西省科技厅自然科学基金项目(2020SF-438)。

摘　　要：[目的]探究秦岭中段太白山以北土壤碳、氮、磷含量及其生态化学计量特征。[方法]在秦岭中段太白山以北选取4个不同海拔梯度(1500、1800、2100、2400 m)的0~20、20~40、40~60 cm土层取样,测定分析土壤有机碳、总氮、总磷含量及变化特征,并计算分析生态化学计量特征。[结果]土壤有机碳、总氮和总磷的平均含量分别为31.72、3.36、0.29 g/kg,随着海拔增加,土壤整体的有机碳、总氮和总磷均呈先升后降趋势;土壤C/N、C/P、N/P的均值分别为9.58、94.45和10.02,随着海拔增加,土壤整体的C/N呈下降趋势,N/P呈上升趋势,C/P无明显变化;0~20 cm土层的C/P、N/P均显著高于20~40和40~60 cm土层,而海拔2100~2400 m处不同土层的C/N之间无显著差异,且土壤C、N之间具有较高的耦合性;在20~40和40~60 cm土层中,海拔2100~2400 m处的土壤C/P、N/P均高于1500~1800 m,1500~1800 m处C/N高于其他海拔。[结论]该地区土壤养分及其化学计量特征随海拔有明显变异,总体表现为碳、氮含量丰富,磷缺乏,应适量增施磷肥,重视土壤保育工作。[Objective]To investigate the contents of soil carbon,nitrogen and phosphorus and their ecological chemometric characteristics in soils from north of the Taibai Mountains in the middle part of the Qinling Mountains.[Method]This study selected soil samples from 0-20,20-40 and 40-60 cm at four different elevation gradients(1500,1800,2100 and 2400 m)north of the Taibai Mountains in the middle part of the Qinling Mountains,the contents of soil organic carbon,total nitrogen and total phosphorus and their variation characteristics were determined and analyzed,and the ecological chemometric characteristics were calculated and analyzed.[Result]The average contents of soil organic carbon,total nitrogen and total phosphorus were 31.72,3.36 and 0.29 g/kg,respectively,and the soil organic carbon,total nitrogen and total phosphorus showed an increasing first and then decreasing trend with increasing altitude.The average values of soil C/N,C/P,and N/P were 9.58,94.45,and 10.02,respectively.With the increase of altitude,the overall C/N of the soil showed a downward trend,while N/P showed an upward trend,with no significant change in C/P.The C/P and N/P in 0-20 cm soil layer were significantly higher than those of 20-40 and 40-60 cm soil layer,while there was no significant difference between the C/N of different soil layers at altitude 2100-2400 m,and there was a high coupling between soil C and N.In the soil layers of 20-40 and 40-60 cm,the soil C/P and N/P at altitude 2100-2400 m were higher than those at 1500-1800 m,and the C/N at 1500-1800 m was higher than those at other altitudes.[Conclusion]The soil nutrients and their stoichiometric characteristics in this area have obvious variation with altitude,and the overall performance is rich in carbon and nitrogen and deficient in phosphorus,which should be appropriately increased with phosphorus fertilizer and attention to soil conservation work.

关 键 词：海拔 土壤有机碳 总氮 总磷 含量 生态化学计量特征 土层深度 秦岭 

分 类 号：X144[环境科学与工程—环境科学]