蒙古高原草原土壤微生物量碳氮特征  

SOIL MICROBIAL BIOMASS CARBON AND NITROGEN IN MONGOLIAN GRASSLAND

作　　者：李香真[1] 曲秋皓[2] 

机构地区：[1]中国科学院植物研究所,北京100093 [2]中国农业科学院土壤肥料研究所,北京100081

出　　处：《土壤学报》2002年第1期97-104,共8页Acta Pedologica Sinica

基　　金：中国科学院知识创新工程重大项目 (KSCX1 -0 8)资助

摘　　要：沿着水分梯度采集了蒙古高原不同草原类型表层土壤样品 1 44个 ,分析了土壤微生物量C、N含量及其与年平均温度和降雨量的关系。结果表明 :蒙古高原草原土壤微生物量C、N与土壤有机C、全N、降雨量、温度均表现出了很好的相关性。微生物量C变化在5 1 7～ 797mgkg- 1之间 ,微生物量N变化在 1 1 0～ 1 1 8 6mgkg- 1之间。微生物量C∶N比变化在 5～ 9之间。土壤微生物量碳 (Cmic)占土壤有机碳 (Corg)的比例 (Cmic Corg)变化在 1 1 5 %～ 4 1 %之间 ,Cmic Corg与土壤有机C、全N、降雨量均成显著的负相关。土壤呼吸表现为草甸草原土壤 >典型草原 >荒漠草原 ,土壤呼吸与降雨量显著正相关 ,与温度显著负相关。呼吸熵 (QCO2 )与降雨量成二次抛物线关系。放牧对微生物量的影响与不同草原类型和放牧率有关。WT5BZ?1/2144 soil samples were collected along the moisture gradient in grassland region of the Mongolian Plateau for investigating soil microbial biomass C (?C?a-a(c)m?i?c ) and N(?N?a-a(c)m?i?c ), and their relations to annual average temperature and rainfall. The results are as followings: Soil microbial biomass C and N showed significant correlations with soil organic carbon, total nitrogen, precipitation, and temperature. ?C?a-a(c)m?i?c ranged from 51.7 to 797mg?kga?a(c)-1 ; ?N?a-a(c)m?i?caa from 11 to 118.6mg?kga?a(c)-1 ; ?C?a-a(c)m?i?c ∶?N?a-a(c)m?i?c from 5 to 9, and ?C?a-a(c)m?i?c /?C?a-a(c)o?r?g from 1.15Abstract ?1/4WT5BZ?1/2144 soil samples were collected along the moisture gradient in grassland region of the Mongolian Plateau for investigating soil microbial biomass C (?C?a-a(c)m?i?c ) and N(?N?a-a(c)m?i?c ), and their relations to annual average temperature and rainfall. The results are as followings: Soil microbial biomass C and N showed significant correlations with soil organic carbon, total nitrogen, precipitation, and temperature. ?C?a-a(c)m?i?c ranged from 51.7 to 797mg?kga?a(c)-1 ; ?N?a-a(c)m?i?caa from 11 to 118.6mg?kga?a(c)-1 ; ?C?a-a(c)m?i?c ∶?N?a-a(c)m?i?c from 5 to 9, and ?C?a-a(c)m?i?c /?C?a-a(c)o?r?g from 1.15% to 4.1%. ?C?a-a(c)m?i?c /?C?a-a(c)o?r?g was correlative negatively with soil organic C, total N, and annual average precipitation. Soil respiration showed a decreasing trend: meadow steppe a(c)>typical steppe> desert steppe, correlating positively with precipitation, and negatively with temperature. The relationship of metabolic quotient CO 2 (?Q?a-a(c)C?O 2 ) with precipitation can fit in quadratic equation. Effect of grazing on soil microbial biomass depends on grassland types and grazing intensity. ?1/4WTHZ?1/2

关 键 词：蒙古高原 草原土壤 土壤微生物量 碳 氮 

分 类 号：S812.2[农业科学—草业科学] S154.4[农业科学—畜牧学]