Abstract:

In order to research the characteristics of different types of forest soil microorganism quantity and biomass in the global climate characteristics, to reveal the different forest types on microbial number and biomass carbon, nitrogen effect, the author used the method of chloroform fumigation extraction and dilution plate on camphor forest plantations, pine plantations and camphor-artificial pine mixed forest with soil microbes, biomass and distribution of carbon and nitrogen in Forest Botanical Garden, Changsha, Hunan. The results showed that: (1) camphor forest, mixed forest and pine forest, the total number of microbial camphor forest>mixed forest>pine forest, showed a significant difference (P<0.05); (2) Forest type had significant different impact on soil microbial quantity and proportion. Various types of microbial characteristics were as follows: bacteria was: camphor forest>pine forest>mixed forest; fungus was: mixed forest>pine forest>camphor forest; actinomycetes was: mixed forest>pine forest>camphor forest; (3) 3 forests in soil microbial biomass carbon was characterized by pine forest>mixed forest>camphor forest, the average contents were 543.01 mg/kg, 421.48 mg/kg, 370.95 mg/kg; characteristics of microbial biomass nitrogen was: camphor forest>pine forest>mixed forest, the average content of 37.28 mg/kg, 23.20 mg/kg, 15.12 mg/kg. Microbial biomass carbon and nitrogen and soil organic carbon, total nitrogen was significantly positively correlated with soil moisture was no significant correlation between soil organic matter affect, soil microbial biomass was an important factor.