摘要
以山西省关帝山不同海拔的8个样地土壤为研究对象,分析不同海拔土壤碳氮含量、土壤碳矿化和细菌、真菌、放线菌、固氮菌、硝化细菌和反硝化细菌6类微生物量的变化.结果表明,海拔为2163m时,土壤有机碳和活性碳1(LC1)最高,分别为74.41和6.72g/kg,在海拔2700m总氮含量最高为6.54g/kg.土壤碳矿化累积量和碳矿化速率因海拔的升高而显著增加(P<0.05),土壤碳矿化累积量和活性碳2(LC2)之间有显著正相关.土壤细菌、放线菌和固氮菌的数量在海拔为1791m时最高,分别为3.41×10~6、1.90×10~6和1.21×10~6个/g,细菌、真菌、放线菌和固氮菌的数量随着海拔的升高而逐渐下降,与海拔之间呈显著负相关;相反,硝化细菌和反硝化细菌数量却逐渐增加,在海拔为2700m时最高,分别为1.37×10~4和6.02×10~3个/g,它们与海拔和总氮之间的关系呈显著正相关(P<0.01).总之,土壤有机碳、总氮、碳矿化累积量、硝化细菌和反硝化细菌随海拔显著增加,而细菌、真菌、放线菌和固氮菌随海拔的变化呈相反的趋势.
Eight soil samples from different elevations were collected in Guandi Mountain,Shanxi Province.We measured soil organic and liable carbon,total nitrogen,carbon mineralization and microbial populations（including bacteria,fungi,actinomyces,azotobacter,nitrifying and denitrifying bacteria）along an altitude gradient.The results showed that the highest soil organic and liable carbon 1（LC1）at an altitude of 2163m were 74.41 and 6.72g/kg,respectively.The highest total nitrogen was 6.54g/kg at 2700m altitude.Both the accumulation and rate of soil carbon mineralization increased significant with the increase of altitude.There was a significantly positive correlation between soil carbon mineralization and liable carbon 2（LC2）.At an altitude of 1791m,the most populations of bacteria,actinomyces and azotobacter were3.41×10^6,1.90×10^6 and 1.21×10^6 cfu/g,respectively,however,there were the lowest nitrifying and denitrifying bacteria（4.05×10^3 and 1.79×10^3 cfu/g,respectively）.Soil bacteria,fungi,actinomyces and azotobacter demonstrated significantly negative correlations with an altitude.However,both soil nitrifying and denitrifying bacteria were positively correlated with the altitude and total nitrogen.In summary,soil organic and liable carbon,total nitrogen,carbon mineralization accumulation,nitrifying and denitrifying bacteria increased along an altitudinal gradient,however,the contrary patterns were demonstrated among bacteria,fungi,actinomyces and azotobacter.
作者
李君剑
杜宏宇
刘菊
严俊霞
李洪建
Jun-jian1 , DU Hong-yu1, LIU Ju2, YAN Jun-xia1, LI Hong-jian1(1 .Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China; 2.Shanxi Academy of Forestry Science, Taiyuan 030012, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2018年第5期1811-1817,共7页
China Environmental Science
基金
国家自然科学基金资助项目(41771548)
关键词
海拔
土壤碳矿化
微生物量
活性碳
altitude
soil carbon mineralization
soil microbialpopulation
liable carbon
