甘南草地土壤微生物与理化特性  

Soil properties associated with microbe in different types of Gannan grassland

作　　者：朱炜歆[1] 索南吉[1] 顾振宽[1,2] 陈懂懂[3,4] 张世虎[5] 杜国祯[1,2] 

机构地区：[1]兰州大学干旱与草地生态教育部重点实验室,甘肃兰州730000 [2]兰州大学草地农业科技学院,甘肃兰州730020 [3]中国科学院西北高原生物研究所,青海西宁810001 [4]中国科学院高原生物适应与进化重点实验室,青海西宁810001 [5]西北师范大学生命科学学院,甘肃兰州730070

出　　处：《草业科学》2012年第10期1491-1496,共6页Pratacultural Science

基　　金：国家自然科学基金重点项目(40930533);国家科技支撑计划项目(2009BAC53B01)

摘　　要：在甘肃省甘南州境内,土壤微生物呼吸强度在不同草地类型草地上由大到小的顺序:0～15cm深度为沼泽化草甸>高寒灌丛草甸>高寒草甸>亚高寒草甸>山地草原,15～30cm深度为沼泽化草甸>亚高寒草甸>山地草原>高寒灌丛草甸>高寒草甸,30～60cm深度为沼泽化草甸>山地草原>亚高寒草甸>高寒草甸>高寒灌丛草甸;微生物碳在不同草地类型草地上由大到小的顺序:0～15cm与15～30cm深度均为沼泽化草甸>高寒灌丛草甸>高寒草甸>亚高寒草甸>山地草原,30～60cm深度为沼泽化草甸>亚高寒草甸>高寒灌丛草甸>高寒草甸>山地草原。同一草地类型的土壤呼吸强度、微生物碳都在各自土壤深度下随深度增加而减小,代谢熵的变化趋势刚好相反,微生物商的变化趋势不明显。土壤呼吸强度、微生物碳均分别与土壤含水量、有机碳、全氮呈极显著正相关(P<0.01),而代谢熵与之呈极显著负相关(P<0.01),微生物商与含水量、全氮呈极显著正相关(P<0.01),而与有机碳呈极显著负相关(P<0.01)。In Gannan region of Gansu province,the numerical sizes of respiration rates of different grassland type soils are： swamping meadowalpine shrub meadowalpine meadowsub-alpine meadowupland meadow（0-15 cm）,swamping meadowsub-alpine meadowupland meadowalpine shrub meadowalpine meadow（15-30 cm）,and swamping meadowupland meadowsub-alpine meadowalpine meadowalpine shrub meadow（30-60 cm）.The numerical sizes of soil microbial biomass carbon of different grassland type soils are： swamping meadowalpine shrub meadowalpine meadowsub-alpine meadowupland meadow（0-15,15-30 cm）,and swamping meadowsub-alpine meadowalpine shrub meadowalpine meadowupland meadow（30-60 cm）.Respiration and microbial biomass carbon of different grassland type soils decreased with soil depth,while respiratory quotient increased and microbial quotient has no significant change.There was a significant positive correlation（P0.01） between respiration,microbial biomass carbon and soil moisture,total organic carbon,total nitrogen,and a significant negative correlation（P0.01） between respiratory quotient and soil moisture,total organic carbon,total nitrogen.A significant positive correlation（P0.01） exists between microbial quotient and soil moisture,total nitrogen,while a significant negative correlation（P0.01） exists between microbial quotient and total organic carbon.

关 键 词：青藏高原 草地类型 土壤深度 微生物量 退化程度 

分 类 号：S812.2[农业科学—草业科学] S154.36[农业科学—畜牧学]