本文關(guān)鍵詞： 混交林 郁閉度 土壤微生物 功能多樣性　出處：《生態(tài)學(xué)雜志》2017年09期 　論文類型：期刊論文

【摘要】：混交林可以形成層次多或冠層厚的林分結(jié)構(gòu),對(duì)提高防護(hù)效能和穩(wěn)定性具有重要作用。本研究先對(duì)20年林齡的馬尾松(Pinus massoniana)人工林進(jìn)行5種不同強(qiáng)度的采伐(皆伐、強(qiáng)度、中強(qiáng)度、中弱度和弱度,伐后郁閉度分別為0、0.4、0.5、0.6和0.7),然后在林下等量種植肉桂(Cinnamomum cassia)。7年后,應(yīng)用BIOLOG-ECO技術(shù)探討不同混交模式、林分類型對(duì)土壤微生物功能多樣性的影響。結(jié)果表明,混交林的土壤理化性質(zhì)、AWCD(average well color development)值和微生物功能多樣性指數(shù)均優(yōu)于馬尾松和肉桂純林,其中肉桂純林最低、基于中弱度采伐而建的混交林最高(與馬尾松純林差異顯著),且土壤微生物功能多樣性隨土層深度增加而降低。主成分分析結(jié)果顯示,不同混交模式之間土壤微生物碳源利用特征分異不明顯;而不同林分類型之間存在明顯分異,主要起分異作用的是微生物對(duì)氨基酸類、羧酸類和糖類的利用特征,且不同林分類型對(duì)土壤微生物碳源利用的差異顯著受土壤含水率與有機(jī)質(zhì)含量影響;含水率、有機(jī)質(zhì)、全氮、全磷、全鉀含量和土壤碳氮比對(duì)土壤微生物群落功能多樣性也有著重要影響�？梢�,馬尾松林種植肉桂能提高微生物活性和功能多樣性,本研究結(jié)果可為改造馬尾松純林為混交林提供參考。
[Abstract]:The mixed forest can form a stand structure with multiple layers or canopy thickness, which plays an important role in improving the protection efficiency and stability. In this study, five different intensities of cutting (clear cutting, intensity) were carried out on Pinus massoniana plantations at the age of 20 years. The density of middle intensity, middle and weak degree, and canopy density after cutting were 0 0.4 and 0.5 0. 6 and 0. 7, respectively. After 7 years, the effects of different mixed models and stand types on soil microbial functional diversity were studied by using BIOLOG-ECO technique, and the same amount of Cinnamomum cassia was planted under the forest. The soil physical and chemical properties and microbial function diversity index of mixed forest were better than those of pure Pinus massoniana and cinnamon forest, among which cinnamon pure forest was the lowest. The results of principal component analysis showed that the mixed forest was the highest (the difference was significant with the pure Pinus massoniana forest), and the functional diversity of soil microorganisms decreased with the increase of soil depth. The characteristics of soil microbial carbon source utilization were not obvious among different mixed models, but there were obvious differences among different stand types, the main function of differentiation was the utilization characteristics of amino acids, carboxylic acids and carboxylic acids, and carboxylic acids, carboxylic acids, and carboxylic acids, and carboxylic acids, carboxylic acids and sugars. The difference of soil microbial carbon source utilization among different stand types was significantly affected by soil moisture content and organic matter content; Total potassium content and soil C / N ratio also have important effects on the functional diversity of soil microbial communities. It can be seen that cinnamon cultivation in Pinus massoniana forest can improve microbial activity and functional diversity. The results of this study can be used as a reference for improving Pinus massoniana pure forest for mixed forest.
【作者單位】： 南京林業(yè)大學(xué)林學(xué)院;廣西大學(xué)林學(xué)院;廣西林業(yè)種苗管理總站;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31460196) 廣西林業(yè)科技項(xiàng)目(桂林科字[2014]第24號(hào))資助
【分類號(hào)】：S714.3

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 齊雅靜;白淑蘭;閆偉;邵東華;韓勝利;;油松、虎榛子不同林型土壤微生物功能多樣性研究[J];干旱區(qū)資源與環(huán)境;2010年10期

，

本文編號(hào)：1509224