高原农业2025，Vol.9Issue(5)：596-604,9.DOI:10.19707/j.cnki.jpa.2025.05.007
西藏米拉山西坡不同海拔梯度土壤有机碳氮分布特征
The Distribution Characteristics of Soil Organic Carbon and Nitrogen at Different Altitude Gradients on the West Slope of Mila Mountain in Xizang
摘要
Abstract
This study was conducted to investigate the distribution characteristics of soil organic carbon(SOC),nitrogen,and their components along an altitudinal gradient on the western slope of Mila Mountain in Xizang,thereby providing a scientific basis for understanding regional soil carbon and nitrogen cycling.Soil samples were collected from six sampling sites at 200-meter intervals between 3 900 and 4 900 m above sea level,and were stratified into depths of(0～20)cm,(20～40)cm,and(40～60)cm for analysis.The results showed that:(1)With increasing altitude,soil pH decreased(range:5.49～6.69),while bulk density and the contents of SOC and its components first increased and then decreased(bulk density range:0.23～0.48 g/cm³).With increasing soil depth,pH gradually increased,whereas SOC and its components significantly decreased.(2)SOC and its components were negatively correlated with soil pH,bulk density,altitude,and soil depth.(3)Soil microbial biomass carbon and nitrogen were primarily regulated by SOC and soil organic nitrogen(SON).(4)Variations in SOC and its components were mainly influenced by altitudinal gradient.In conclusion,vegetation type changes driven by altitude are the primary factor governing the dynamics of soil organic carbon and nitrogen in this region.关键词
土壤有机碳/土壤微生物量碳/土壤微生物量氮/海拔梯度/米拉山Key words
Soil Organic Carbon/Soil Microbial Carbon/Soil Microbial Nitrogen/Altitude Gradient/Mila Mountain分类
农业科技引用本文复制引用
吴亚轩,马和平,司孟鑫,范冰冰,王彪..西藏米拉山西坡不同海拔梯度土壤有机碳氮分布特征[J].高原农业,2025,9(5):596-604,9.基金项目
林芝地区苔藓植物多样性及其生态群落考察(XZ202301ZY0041G) （XZ202301ZY0041G）
西藏农牧大学农业资源与环境学科建设项目(2025). （2025）
