贺兰山不同海拔土壤颗粒有机碳、氮特征  

Responses of soil particulate organic carbon and nitrogen along an altitudinal gradient on the Helan Mountain,Inner Mongolia

作　　者：杨益[1] 牛得草[1] 文海燕[1] 张宝林 董强 陈菊兰 傅华[1] 

机构地区：[1]兰州大学草地农业科技学院草地农业生态系统国家重点实验室,甘肃兰州730020 [2]内蒙古阿拉善盟草原总站,内蒙古巴彦浩特750306 [3]内蒙古阿拉善盟畜牧研究所,内蒙古巴彦浩特750306

出　　处：《草业学报》2012年第3期54-60,共7页Acta Prataculturae Sinica

基　　金：中国科学院战略性先导科技专项-应对气候变化的碳收支认证及相关问题(XDA05050406-8);科技部科技支撑计划项目(2008BAD95B03);国家自然科学基金项目(31070412);兰州大学中央高校基本科研业务费专项资金(lzujbky-2012-98)资助

摘　　要：采用颗粒大小的物理分组方法,测定了贺兰山(西坡)不同海拔具有代表性的8个样地的草地土壤颗粒有机碳和颗粒有机氮含量,并且分析了土壤颗粒碳、氮分配比例与植被特征及环境因子的关系。结果表明,土壤颗粒碳、氮含量随海拔的降低而显著降低,随土层深度的增加而降低;在4个植被类型中,二者在高山草甸最高,在草原化荒漠最低。土壤颗粒碳、氮分配比例随海拔的降低表现出先降低后升高的趋势,在高山草甸最高,山地荒漠草原最低。土壤颗粒碳、氮分配比例与植被盖度、地上生物量、年均降水量呈极显著的正相关关系,与年均温呈极显著的负相关关系。The physical fractionation method was used to measure the contents of soil particulate organic carbon（POC） and particulate organic nitrogen（PON） in eight grassland sites along an elevation gradient on the Helan Mountain,Inner Mongolia.The relationships of POC,PON and their proportion with vegetation characteristics and environmental factors were analyzed.Both POC and PON declined significantly with altitude and with soil depth.Meanwhile,POC and PON changed significantly among vegetation types.The proportions of POC and PON reduced considerably with the altitude from 2 940 to 1 820 and 1 700 m.Among the four vegetation types,proportions of both POC and PON were the highest in the alpine meadow and lowest in the desert steppe.The proportions of POC and PON had significant positive correlations with vegetation cover,aboveground plant biomass and mean annual precipitation,but a significant negative correlation with mean annual temperature.

关 键 词：草地 贺兰山 土壤颗粒有机碳 土壤颗粒有机氮 

分 类 号：S812.2[农业科学—草业科学] S153.6[农业科学—畜牧学]