Relations between Soil Soluble Organic Nitrogen and Microbial Compositions in Three Plantations
Soil SON directly affects the effectuality and fluidity of soil nutrients in the ecosystem, and plays a vital role in microbe biogeochemistry cycling. The concentration of SON is controlled by the diversity of soil microbe. However, studies on the relations between soil microbial compositions and SON concentration have been rarely reported. In the present study, the SON concentration and the composition of microbe in three plantations in mid-subtropics were measured. The results showed that; The contents of water - soluble SON in soil showed significant vertical differences, which were very significantly higher in the 0 -20 cm soil layer than those in the deep soil layer (20 -40 cm). The differences in the SON content among different-type forest soil were not significant. The relative biomasses of microorganisms, bacteria, fungi and actinomycetes in the mixed coniferous forest soil were extremely significantly higher than those in the broad-leaved forest or in the coniferous forest (P < 0.001), and the relative biomasses of microbial, bacteria and actinomycetes in the broad-leaved forest soil were significantly higher than those in the coniferous forest soil, but the relative bio-mass of fungi in the broad-leaved forest soil was significantly lower than that in the coniferous forest soil(P < 0.05) . The relative biomasses of pseudomonas bacteria and methane-oxidizing bacteria in the broadleaf forest soil(9 756.3 ±751. 7 and 1 476. 3 ± 15. 5 nmol of PLFA/g, respectively), were significantly higher than those in the mixed coniferous or in coniferous forest soil, and that in the mixed coniferous was significantly higher than that in the coniferous forest soil (P<0.05). There existed significant positive correlation between the content of soil SON and the relative biomass of various components of the soil microbial flora.
国家科技期刊平台
NSTL
万方数据
维普
