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藏东南色季拉山不同海拔森林土壤碳氮分布特征
杨 红1,2,3, 扶胜兰1, 刘合满,等1,2
1.信阳农林学院;2.西藏农牧学院;3.西藏高原森林生态教育部重点实验室
摘要:
【目的】明确藏东南色季拉山不同海拔森林土壤有机碳(Soil organic carbon,SOC)、易氧化有机碳(Readily oxidized carbon,ROC)及全氮(Total nitrogen,TN)含量的垂直分布特征。【方法】以藏东南色季拉山不同海拔高度(3 000,3 200,3 500,3 700及3 900 m)的森林土壤为研究对象,采集0~5,5~10,10~20,20~30,30~40,40~50 cm土层土壤样品,通过测定SOC、ROC及TN含量,研究不同海拔高度及剖面土壤SOC、ROC及TN含量垂直分布特征,阐述SOC、ROC及TN含量的海拔及剖面效应。【结果】在土壤剖面垂直分布上,SOC、ROC和TN含量均随土层深度增加而降低,且主要集中在表层(0~5 cm)土壤中。随着土层深度增加,土壤易氧化有机碳占有机碳的比例(ROC/SOC)总体呈增加趋势,而土壤C/N(SOC/TN)的变化趋势并不一致。SOC和ROC平均含量随海拔高度的增加均呈增大趋势;除3 500 m海拔高度TN含量较低外,其余各海拔的TN含量均随海拔高度增加而增大;ROC/SOC随海拔增加总体呈减小趋势,而C/N明显变化规律。【结论】色季拉山森林SOC、ROC和TN主要储存于表层土壤和高海拔区域土壤中,在未来气候变暖的背景下,高海拔区域表层土壤将成为大气二氧化碳浓度升高的潜在碳源。
关键词:  色季拉山  森林土壤  土壤有机碳  易氧化有机碳  土壤全氮
DOI:
分类号:
基金项目:国家自然科学基金项目(41461055,41561052,31360119);西藏农牧学院“雪域英才工程”人才发展支持计划项目(2015XYD06);西藏农牧学院研究生创新计划项目(YJS2016-7);2016年高校青年教师创新支持计划项目(QCZ2016-49);西藏科技厅 农牧学院厅校联合基金项目(2016-NY-03)
Distribution characteristics of carbon and nitrogen in forest soil at different altitudes in Sejila Mountains,Southeast Tibet
YANG Hong,FU Shenglan,LIU Heman,et al
Abstract:
【Objective】This study aimed to investigate the vertical distribution characteristics of soil organic carbon (SOC),readily oxidized carbon (ROC) and total nitrogen (TN) in alpine regions at different altitudes in Sejila Mountains,Southeast Tibet.【Method】Soil samples at different altitudes (3 000,3 200,3 500,3 700 and 3 900 m) of Sejila Mountains were collected and the contents of SOC,ROC and TN were measured at different layers (0-5,5-10,10-20,20-30,30-40 and 40-50 cm).Then,the vertical distribution characteristics of SOC,ROC and TN contents and the altitude and section effects were analyzed.【Result】The SOC,ROC and TN contents decreased with the depth of soil layer in vertical distribution and mainly concentrated in the surface soil.With the increase of soil depth,ROC/SOC showed an increasing trend,while C/N trend was not consistent.In the altitude distribution, the SOC and ROC average contents showed an increasing trend with the increase in altitude,while TN contents increased with height except for 3 500 m.The ROC/SOC decreased with increasing altitude,and C/N had no significant change.【Conclusion】SOC,ROC and TN were mainly stored in the surface soil at high altitudes in forests in Sejila Mountains.High altitude surface soil could be a potential carbon source for elevated atmospheric carbon dioxide concentrations in future climate.
Key words:  Sejila Mountains  forest soil  soil organic carbon  readily oxidized carbon  soil total nitrogen