攀枝花干热河谷区麻疯树土壤微生物种群数量分析

本文利用土壤微生物传统数量测定法,分析了攀枝花9个麻疯树主要分布区土壤微生物数量分布情况。分析结果表明,在三大微生物种群中,细菌占93.9%,丝状真菌和放线菌分别占3.1%和3.0%;不同林分年龄土壤微生物总数差异显著,成熟林分(1 237.6×104)>人工幼林(955.4×104);土壤类型不同,微生物种群数量差异明显,红壤(1 349.2×104)>黄沙壤(1 306.8×104)>山地黄壤(580.0×104)。通过土壤主要微生物生理类群分析结果,攀枝花麻疯树主要分布区土壤微生物生理类群数量比较贫乏,在氨化细菌数量中,红壤(37.0×103)>黄沙壤(0.8×103)>山地黄壤(0.3×103);在好气性纤维菌中,红壤(0.8×103)>黄沙壤(0.7×103)>山地黄壤(0.3×103);消化细菌,反消化细菌在山地黄壤和黄沙壤有少量分布;在3种土壤中均未分离到好气性固氮菌,说明攀枝花麻疯树主要分布区土壤不适宜好气性固氮菌生长繁殖。

A Quantitative Analysis of Soil Microbial Populations of Jatropha curcas trees in Dry-hot Valleys of Panzhihua

In this paper,the quantitative determination method was used for analysizing the distribution of soil microbial quantity in 9 Jatropha curcas tree distribution areas of Panzihua. The results of the analysis showed that in the three major microbial populations, bacteria accounted for 93.9 % , filamentous fungi and actinomycetes occupied 3.1% and 3.0% respectively. The total number of soil microorganisms in different stand ages displayed a significant difference： mature stands （1 237.6×10^4） 〉 plantation （955.4×10^4）. Different soil types had an obvious difference in microbial total number：red soil （1 349. 2 ×10^4） 〉 yellow sand soil （ 1 306. 8×10^4） 〉 mountain yellow soil （580. 0×10^4 ）. On the basis of main soil microbial physiological class group analysis results, in the main distribution area of Jatropha curcas in Panzihua soil microbial physiological class group number was comparatively poor. As for ammoniated bacteria number,mountain red soil （37. 0×10^3） 〉 yellow sand soil （0. 8×10^3） 〉 yellow soil （0. 3×10^3）. As for aerobic sexual fiber bacteria, red soil （0. 8×10^3） 〉 yellow sand soil （0. 7 ×10^3） 〉 mountain yellow soil （0. 3×10^3 ） ; digestive bacteria and anti-digestive bacteria had a small amount of distribution in mountain yellow soil and yellow sand soil. No aerobic nitrogen-fixing bacteria were found in three types of soil, implying that the soil of the main distribution areas of Jatropha curcas in Panzihua was not suitable for the reproduction of aerobic nitrogen-fixing bacteria.