Phospholipid Fatty Acid Analysis on the Soil Microbial Communities in the Root Zones of Averrhoa carambola Linn and Litchi chinensis Sonn
The soil microbial communities in the root zones of Averrhoa carambola Linn.cv.Taiwan soft-branch carambola and Litchi chinensis Sonn.cv.Wuye,which had been growing for 20 and 15 years respectively in the same orchard,were analyzed using phospholipid fatty acids biomarkers(PLFAs).The result revealed that,all soil samples of the carambola plantation were detected 25-32 PLFAs biomarkers,with the distinctive as i13:0,11:0 3OH and 14:0 2OH.Soil samples of litchi plantation contained 23-40 PLFAs biomarkers,distinctively possessing PLFAs of 16:0 3OH,i18:0,i12:0,12:1 AT 11-12 and a14:0.For the soil microbial communities of the carambola plantation,the simpson's diversity index and the quantities of PLFA 16:0 related to bacteria,18:1ω9c related to fungi and 10Me16:0 related to sulfate-reducing bacteria were similar between the soils at 1.0 m and 1.5 m horizontally away from the base of tree stem,and significantly lower in the soil at 0.5 m horizontally away from the stem base.For the soil microbial communities of the litchi plantation,simpson's index and the quanities of PLFA 16:0,18:1ω9c and 10Me16:0 were similar between the soils at 0.5 m and 1.5 m horizontally away from the stem base,and significantly higher at the distance of 1.0 m to the stem base.The quantities each of PLFAs 10Me17:0 related to actinomycete and 16:1ω5c related to methane-oxidizing bacteria were not significantly different among soil samples of the carambola plantation,but significantly differed among the soil samples of the litchi plantation,indicating the influence of plant species on the distribution of microbial PLFAs.