高原农业2025，Vol.9Issue(3)：345-352,8.DOI:10.19707/j.cnki.jpa.2025.03.007
西藏德姆拉山海拔梯度上的土壤养分和化学计量特征
Charateristics of Soil Nutrients and Stoichiometry along Elevational Gradient in Demola Mountain in Xizang
摘要
Abstract
Soil carbon(C),nitrogen(N),and phosphorus(P)contents,together with their stoichiometric characteristics,exhibit large variations along altitudinal gradients.These variations in high-altitude regions of Xizang are not yet well understood.In this study,we investigated the surface soil(0～10 cm)chemical properties at altitudinal intervals of 100 m on the Demola Mountain in Xizang,ranging from 3 600 to 4 700 m.The results were as follows:(1)Soil organic carbon(SOC)fluctuated greatly along the altitude gradient,while total nitrogen and phosphorus showed smaller fluctuations;(2)C/N and C/P ratios mainly varied with SOC content,and N/P was the highest at 4 500 m;(3)Soil C/N ratios at different altitudes were generally higher than the national average,while C/P and N/P ratios were generally lower.These results indicated that besides altitude-related climatic conditions,the factors affecting SOC,N,and P variations also included vegetation type,soil texture,topography,and human activities,exihibiting a high degree of spatial heterogeneity.The low temperatures at high altitudes on the plateau slowed down the decomposition of soil SOC and TN,resulting in higher accumulation of SOC than the national average.The results facilitated understanding of the nutrient supply status and limiting factors of mountain forest soils on the Qinghai-Xizang Plateau,and provided useful data for the protection and assessment of forest soil quality on Demola Mountain.关键词
西藏高原/土壤有机碳/土壤表层/土壤质量评价Key words
Qinghai-Xizang Plateau/Soil organic carbon/Surface soil/Soil quality assessment分类
农业科技引用本文复制引用
罗珊,方江平,屈兴乐..西藏德姆拉山海拔梯度上的土壤养分和化学计量特征[J].高原农业,2025,9(3):345-352,8.基金项目
国家重点研发计划(2016YFC0502006) （2016YFC0502006）
西藏自治区重大科技专项(Z2016C01G01/02). （Z2016C01G01/02）
