不同干扰方式下温性草甸草原土壤碳氮磷化学计量特征及其储量研究  

Stoichiometric Characteristics and their Storage of Soil Carbon,Nitrogen and Phosphorus in the Temperate Meadow Steppe under Different Disturbances

作　　者：关伟涛 郑志荣[1,2] 刁兆岩 马普[1,2,3] 靳三玲 王旭 吕世海 GUAN Wei-tao;ZHENG Zhi-rong;DIAO Zhao-yan;MA Pu;JIN San-ling;WANG Xu;LYU Shi-hai(Institute of Ecology,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;National Environmental Protection Scientific Observation and Research Station of Hulunbuir Wood-Grass Ecotone,Hulunbuir,Inner Mongolia 021000,China;School of Grassland Science,Beijing Forestry University,Beijing 100083,China;School of Life Science,Lanzhou University,Lanzhou,Gansu Province 730000,China)

机构地区：[1]中国环境科学研究院生态研究所,北京100012 [2]国家环境保护呼伦贝尔森林草原交错区科学观测研究站,内蒙古呼伦贝尔021000 [3]北京林业大学草业与草原学院,北京100083 [4]兰州大学生命科学学院,甘肃兰州730000

出　　处：《草地学报》2022年第11期2959-2966,共8页Acta Agrestia Sinica

基　　金：国家重点研发计划项目(No.2018YFF0213405)资助。

摘　　要：为阐明不同干扰方式对呼伦贝尔温性草甸草原土壤碳氮磷化学计量特征及储量分布的影响,本研究于2021年8月末在多年围封、刈割和放牧草地进行样品采集与分析测试。结果表明:地上生物量和凋落物生物量均以围封草地最高,放牧草地最低;3种干扰方式下,土壤容重均随土层深度的增加而增大,土壤含水率均随土层深度的增加而减小,在相同土层,放牧干扰下土壤容重最大,土壤含水率最低;3种干扰方式下,土壤碳氮磷含量均随土层深度的增加而降低,放牧干扰草地中三者含量最低;围封和刈割干扰草地土壤C/N高于放牧干扰草地,而C/P和N/P均以放牧干扰草地最高;放牧干扰草地碳氮磷储量在0~30 cm土层的分布占比最高,呈现表层聚集;干扰方式和土层深度及其交互作用均能显著影响土壤理化性质及计量特征。综上,适度干扰更有利于温性草甸草原的可持续发展。In order to clarify the effects of different disturbances on the stoichiometric characteristics and storage distribution of soil carbon,nitrogen,and phosphorus in the temperate meadow steppe of Hulunbuir,the soil was collected and analyzed in the sample plots under the three disturbances of fencing,moving and grazing at the end of August 2021.The results showed that:under the three different disturbances of fencing,mowing,and grazing,the aboveground biomass and litter biomass were the highest in the fencing sample plot,and both decreased significantly in the grazing sample plot;under the three different disturbances,soil bulk density increased with the increase of the soil layer depth;for the same soil layer,the soil bulk density under grazing disturbance was the largest;the soil water content decreased with the increase of the soil layer depth and the soil water content of the same soil layer was the lowest in the grazing disturbance plots;under the three different disturbances,the contents of soil organic carbon,total nitrogen,and total phosphorus decreased with the increase of the soil layer depth,and the contents of them were the lowest in the grazing disturbance plot;for soil C/N,fencing and mowing disturbance plots were higher than grazing disturbance plots while grazing disturbance plots were the highest for C/P and N/P;the distribution of carbon,nitrogen,and phosphorus storage in the grazing disturbance sample plot was the highest in the 0~30 cm soil layer,showing the phenomenon of topsoil aggregation;soil layer depth and their interaction can significantly affect soil physicochemical properties and stoichiometric characteristics.In conclusion,a moderate disturbance is more conducive to the sustainable development of the temperate meadow steppe.

关 键 词：温性草甸草原 干扰方式 土壤碳氮磷储量 化学计量特征 

分 类 号：S812.2[农业科学—草业科学]