摘要
根据定位观测数据,对海南文昌滨海台地3种典型森林(椰子林、相思林和木麻黄林)土壤微生物的数量特征及其与土壤因子的相互关系进行研究。结果表明,滨海台地3种森林类型中,微生物总量表现为椰子林>相思林>木麻黄林;细菌数量以椰子林土壤最高(3 144.67×10~4 CFU·g~(-1)),分别为相思林、木麻黄林的1.99倍和2.56倍;真菌数量以相思林最高(46.12×10~4 CFU·g~(-1)),分别为椰子林、木麻黄林的2.61和1.37倍;放线菌数量以椰子林最高(413.84×10~4 CFU·g~(-1)),分别为相思林、木麻黄林的3.32和1.42倍。不同森林类型土壤微生物三大类群数量,以细菌所占比例最大,放线菌次之,真菌最小。除椰子林真菌数量外,3种森林类型土壤微生物总数、细菌、真菌及放线菌数量均随土层深度的增加而减少,与土层深度呈线性负相关。土壤微生物数量与土壤养分含量之间存在着不同程度的相关关系,椰子林中,土壤全氮和有机碳是影响微生物数量的主要土壤因子;相思林中,全氮和pH值是影响微生物数量的主要因子;木麻黄林中,全氮和全磷是影响微生物数量的主要因子。
Using data collected from certain locations,the quantity of soil microorganisms at three typical forests(Palm forest,Acacia auriculiformis and Horsetail beefwood) in the coastal terrace of Wenchang,Hainan and its relationship with the soil factors were studied.The results showed as follows:the quantity of soil microorganisms was significantly different in different forests.The population of bacteria in the palm forest was the biggest(3 144.67×10~4 cfu·g~(-1)),followed by the Acacia auriculiformis forest(1 817.97×10~4 cfu·g~(-1)) and the Horsetail beefwood forest(1 503.67×10~4 cfu·g~(-1)).The number of fungi was the biggest in the Acacia auriculiformis(46.12×10~4cfu·g~(-1)) and the smallest in the palm forest(17.70×10~4 cfu·g~(-1)).The amount of actinomycetes was the biggest in the palm forest(413.84×10~4 cfu·g~(-1)) and the smallest in the Acacia auriculiformis forest(123.30×10~4 cfu·g~(-1)).The soil microorganism number of three major groups was as follows:bacteria> actinomycetes> fungi.Except for the quantity of fungi in palm forest,the number of soil microbes decreased with an increase of the soil depth.The relationship between soil microbial number and soil nutrients in three forests in coastal terrace was observed.
引文
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