祁连山北麓不同海拔土壤化学计量特征  

Stoichiometry characteristics of soil at different altitudes in the Qilian Mountains

作　　者：高海宁 李彩霞[2] 孙小妹[1] 张勇[2] 陈年来[1] Gao Haining;Li Caixia;Sun Xiaomei;Zhang Yong;Chen Nianlai(College of Resource and Environmental Sciences,Gansu Agricultural University,Lanzhou 730070,China;Key Laboratory of Hexi Corridor Resources Utilization of Gansu,Hexi University,Zhangye 734000,Gansu,China)

机构地区：[1]甘肃农业大学资源与环境学院,甘肃兰州730070 [2]河西学院甘肃省河西走廊特色资源利用省级重点实验室,甘肃张掖734000

出　　处：《中国沙漠》2021年第1期219-227,共9页Journal of Desert Research

基　　金：甘肃省重点研发计划项目(1504FKCA003)。

摘　　要：对祁连山中段冰沟流域土壤有机C、N、P含量垂直分布与化学计量特征及其影响因素进行研究。结果表明:冰沟流域土壤有机C、N、P含量在各样点随土层深度而降低,并在表层土中聚集较明显;在0—40 m土层中,土壤有机C、N、P平均含量随海拔升高总体呈现先增高后下降的趋势,在中、高海拔处最高,P含量变异较小。0—40 cm土层中土壤C/N在海拔3128—2814 m处高于其他海拔,在3075 m处C/N最高,土壤C/N、C/P随海拔升高总体呈下降趋势,均在中高海拔处最高,而土壤N/P在海拔3454 m处最高,在低海拔2814 m处最低。不同植被类型土壤的C/N、N/P差异性不显著,而土壤SOC/P差异显著,3种植被类型影响土壤C/N和C/P的大小为乔木林>高山灌丛>高山草地,而土壤N/P为灌丛>乔木林>高山草地;植被类型、海拔是影响土壤C、N、P含量和化学计量比的主要因素,其次为盖度、坡向。To elucidate the vertical distribution of soil organic carbon(C),nitrogen(N)and phosphorus(P)concentration in Qilian Mountain northern foot,the eco-stoichiometric characteristics at different elevations and their influencing factors were discussed.The results showed that the soil SOC,N and P content decreased with the increase of soil depth,and the significant aggregation was observed at topsoil;In the 0-40 cm soil layer,the average contents of soil SOC,N and P showed a trend of rising first and then declining with the increase of altitude,and reached the highest at the middle and high altitude area.Notably,the variation of P content is small and relatively stable.The C/N was higher at attitude of 3128-2814 m,and especially,the highest at 3075 m.However,soil C/P and N/P showed a downward trend with the increase of altitude,and they were all the highest at the middle and high altitude area,while soil N/P showed the highest level at 3454 m and the lowest level at 2814 m.Meanwhile,there was no significant difference in soil C/N and N/P among different land types but significant difference in C/P.The effects of the three vegetation types on soil C/N and C/P were:arbor forest>alpine shrub>alpine grassland,while N/P was:alpine shrub>arbor forest>alpine grassland.Vegetation type and altitude are the main factors affecting the eco-stoichiometric ratio of soil C,N and P,followed by coverage and slope aspect.

关 键 词：祁连山 海拔 土壤 化学计量比 

分 类 号：S153.6[农业科学—土壤学]