| 广西杉木连栽幼林根际与非根际土壤特性研究 |
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| 作者单位： | ;1.广西林业科学研究院;2.国家林业局中南速生材繁育实验室;3.广西优良用材林资源培育重点实验室;4.广西自治区林业厅 |
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| 基金项目： | 广西优良用材林资源培育重点实验室自主课题资助项目(14-A-02-01);广西林业科技项目（桂林科研[2015]第40号);广西林业科技项目（桂林科字[2014]第30号) 。 |
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| 摘 要： | 采用配对样地法对广西连栽杉木幼林不同栽植代数(一代林G1、二代林G2)的根际土和非根际土进行了土壤特性的分析研究,为连栽杉木人工林经营与可持续发展提供理论依据。结果表明:土壤pH值、有机质、全N、全P、水解性N、有效P、速效K、交换性Ca~(2+)、有效Fe、有效Mn含量均表现为G2G1,根际土(R)非根际土(S),而土壤全K含量则反之。杉木连栽对林地土壤养分状况、酶活性和微生物具有一定影响。土壤酶活性表现为G2G1,根际土(R)非根际土(S)。无论是在根际土还是非根际土,土壤微生物优势种均为细菌,微生物总数、细菌、放线菌、真菌数量表现为G1G2;栽植代数增加,细菌所占微生物总数比例下降,而放线菌所占比例则有明显增加趋势。
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| 关 键 词： | 杉木 连栽 养分状况 微生物 酶活性 |
Rhizosphere and Non rhizosphere Soil Properties Analysis of Cunninghamia lanceolata Plantations Under Different Rotations of Continuously Planting in Guangxi |
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| Abstract: | Abstracts:In order to provide the theoretical basis for the successive Cunninghamia lanceolata plantation management and sustainable development,rhizosphere and non rhizosphere soil properties between the first and the second generation Cunninghamia lanceolata plantation in Guangxi were studied though the pair method.Results showed that the pH value,the contents of soil organic matter, total nitrogen,total phosphorus, alkali solution nitrogen, available phosphorus,available potassium, exchange of calcium ion, available Fe and available Mn of the second generation Cunninghamia lanceolata plantation was higher than the frist one, thoes nutrient content of rhizosphere soil(R) was higher than non rhizosphere soil(S),but the content of soil total K has an opposite trend. Continuously planting has a certain influence on soil enzyme activity, soil nutrient content and microbial.The second generation in the soil enzyme activity was higher than the first one, rhizosphere soil enzyme activities values were higher than the non rhizosphere soil.Whether the rhizosphere soil or non rhizosphere soil,the dominant species of soil microbes was bacteria.The proportion of microbes,the proportion of bacteria,the proportion of actinomycetes and the proportion of fungi showed that the first generation of forest soil>the second generation of forest soil; The proportion of bacteria decreased with continuous planting rotation decreasing,but the proportion of actinomycetes showed a increasing tend. |
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| Keywords: | Key words:Cunninghamia lanceolata the continuous cropping soil nutrient content microorganism enzyme activity |
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