湘中丘陵区土壤微生物指标对土地利用方式的响应  

Responses of soil microbial indicators to land-use types in hilly area, central Hunan province

作　　者：李斌[1,2] 辜翔[1] 方晰[1,3] 李毅[4] 孙伟军[1] 李胜蓝[1] 

机构地区：[1]中南林业科技大学生命科学与技术学院,湖南长沙410004 [2]国家林业局,北京100714 [3]南方林业生态应用技术国家工程实验室,湖南长沙410004 [4]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《中南林业科技大学学报》2015年第4期72-77,88,共7页Journal of Central South University of Forestry & Technology

基　　金：国家林业局林业科技成果推广计划项目([2012]61号);国家林业局林业软科学研究项目(2014-R11)资助

摘　　要：为了探明土地利用方式对土壤微生物性质的影响,研究了湘中丘陵区6种土地利用方式(石栎+青冈常绿阔叶次生林、杉木人工林、毛竹林、苗圃、农用旱地、水田)土壤微生物指标(微生物生物量碳Cmic、氮Nmic含量、微生物熵、微生物生物量碳氮比、土壤基础呼吸强度、土壤微生物代谢熵)。结果表明,土地利用方式明显影响了土壤Cmic、Nmic含量,6种土地利用方式各土层Cmic、Nmic含量的变化趋势基本一致,与青冈+石栎常绿阔叶林相比,毛竹林、水田土壤Cmic、Nmic含量显著提高,而杉木人工林、苗圃、农用旱地却显著下降;6种土地利用方式各土层微生物熵的变化不一致,毛竹林、苗圃、农用旱地、水田土壤微生物熵普遍高于青冈+石栎常绿阔叶林,而杉木人工林最低;水田土壤Cmic/Nmic最高(9.35以上),青冈+石栎常绿阔叶林最低;青冈+石栎常绿阔叶林土壤基础呼吸强度、代谢熵最高,水田土壤基础呼吸强度较高,代谢熵最低,表明湘中丘陵区土壤微生物生物量主要受土壤有机碳源的制约,青冈+石栎常绿阔叶林土壤具有较多活性微生物种群,有机碳利用率较低,有利于土壤有机碳的积累,水田有机碳利用率较高。To explore the influences of land-use types on soil microbial indicators, the soil microbial biomass carbon （Cmic）, soil microbial biomass nitrogen （Nmic）, ratios of Cmic to soil organic carbon （TTOC） and Cmic to Nmic, soil basic respiration （RSR） and ratio of RSR to Cmic （qCO2） were investigated in six different land use patterns （paddy field, slope farmland, nursery, Phyllostachys edulis stand, Cunninghamia lanceolata plantation, Lithocarpus glaber ＋ Cyclobalanopsis glauca secondary forest） in hilly areas of central Hunan Province, China. The results show that the effects of land use patterns on the contents of Cmic and Nmic were significant, both of their variation trends in all soil layers were similar, and compared with （L. glaber ＋ C. glauca secondary forest, the content of Cmic and Nmic significantly increased in both Phyllostachys edulis stand and paddy field, while the content of Cmic and Nmic significantly decreased in C. lanceolata plantation, nursery, slope farmland; The variation trends of Cmic/TTOC had differences in different soil layers among six different land use patterns, the Cmic/TTOC was higher in Phyllostachys edulis stand, nursery, slope farmland, paddy field more than that in L. glaber ＋ C. glauca secondary forest, however that in C. lanceolata plantation was the lowest; The Cmic/Nmic was highest in paddy field （more than 9.35）, however that in L. glaber＋ C. glauca secondary forest was the lowest, both the SR and the qCO2 were highest in L. glaber ＋ C. glauca secondary forest, the SR was higher but the qCO2 was lower in paddy field, which indicated soil microbial biomass was mainly controlled by soil organic carbon source in hilly areas of central Hunan Province, there was more active microbial populations and lower organic carbon utilization rate in L. glaber＋ C. glauca secondary forest, but higher organic carbon utilization rate in paddy field.

关 键 词：土地利用方式 土壤微生物性质 土壤微生物指标 湘中丘陵区 

分 类 号：S714.5[农业科学—林学]