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| Changes of soil microbiological properties of <i>Larix olgensis</i>+Larix kaempferi plantation with the different densities |
| Wang Shuli,Sun Yue,Shen Haiyan,Yuan Weibin |
| Forestry Academy,Northeast Forestry University,150040,Harbin,China |
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Abstract For Larix olgensis + Larix kaempferi plantation management,through the spot investigation and experimental analysis,the change of soil microbiological properties in four densities of Larix olgensis + Larix kaempferi plantation was studied.The four sample stands were stand 1 with 2 500 trees per hectare,stand 2 with 3 300 trees per hectare,stand 3 with 4 400 trees per hectare and stand 4 with 6 600 trees per hectare.Results showed that 1) The quantity of total microorganism and bacteria in soil was in the decline order of stand 2,stand 1,stand 3 and stand 4;The quantity of fungus was in the decline order of stand 1,stand 3,stand 4 and stand 2;The quantity of actinomycetes was in the decline order of stand 3,stand 2,stand 1 and stand 4;2)The four densities of Larix olgensis + Larix kaempferi plantation had the same characteristic of reducing trend of microorganism quantity,that is the deeper the soil layer,the less the quantity of microorganism,and the decline degree of stand 1 and stand 2 was smaller than that of stand 3 and stand 4;3) The quantity change of microorganism and bacteria in every density of Larix olgensis + Larix kaempferi plantation can be classified into three stages,slow growth stage,fast growth stage and decline stage.The fungi quantity of stand 1 and stand 2 was larger in the early stage and less in the late stage.The fast growth stage of actinomycetes quantity of stand 2 and stand 3 presented in the middle stage,the actinomycetes quantity of stand 1 and stand 4 was larger in the early and late stage and less in the middle stage;4) To the young age of Larix olgensis + Larix kaempferi plantation,2 500-3 300 trees per hectare density was more suitable for the living and development of microorganism than 4 400 trees per hectare density,and 6 600 trees per hectare density was the worst density of all.This research would offer some scientific basis for choosing the density of the hybrid larch plantation.
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Received: 21 July 2008
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TU Zhihua, FAN Zhiping, WANG Shanxiang, QIN Yiting, ZOU Yihua, YANG Zhaoming, WANG Jun, WEI Yongjian, WANG Qiong. Soil microbial biomass properties and its controlling factors under different vegetation types of water conservation forests in Dahuofang Watershed[J]. SSWC, 2019, 17(4): 130-140. |
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