东北天然次生林不同经营模式下土壤微生物碳源利用与功能多样性

发布时间：2018-01-06 07:42

本文关键词：东北天然次生林不同经营模式下土壤微生物碳源利用与功能多样性　出处：《林业科学》2016年07期 　论文类型：期刊论文

【摘要】：【目的】研究不同经营模式对东北天然次生林土壤微生物碳源利用与功能多样性的影响,为合理确定东北天然次生林的经营模式提供科学参考。【方法】以哈尔滨市丹青河林场的传统森林经营(FM1)、目标树森林经营(FM2)、调整育林法森林经营(FM3)和无干扰森林经营(FM4)4种经营模式的东北天然次生林为研究对象,在每个经营模式林分中设置3块(上、中、下坡各1块)50 m×50 m样地,并将每块样地划分为25个10 m×10 m样方,在每个样方中心采集0~20 cm土层样品,采用Biolog-Eco微平板法分析4种经营模式林地土壤微生物的碳源利用差异,并探讨土壤化学性质对土壤微生物碳源种类利用的影响,以及4种经营模式土壤微生物功能多样性的差异。【结果】FM1土壤微生物碳源利用最弱且与其他3种经营模式差异显著,FM4土壤微生物碳源利用最强,FM2和FM3 2种经营模式土壤微生物碳源利用处于FM1和FM4之间,且二者之间没有显著差异;土壤化学性质对不同经营模式林分土壤微生物的碳源利用有重要影响,其中碱解氮、速效钾、速效磷、有机碳和碳氮比是主要影响因子;4种经营模式林分土壤微生物功能多样性指数的分析结果表明,FM1土壤微生物功能多样性最小,FM2和FM3次之,FM4最大,这可能与4种经营模式不同的采伐抚育措施有关。【结论】从仅考虑土壤微生物碳源利用及功能多样性角度出发时,无干扰经营是东北天然次生林最佳的经营模式;但综合考虑森林经营的生态效益和经济效益以及林地的更新状况,调整育林法是东北天然次生林最优的经营模式。
[Abstract]:[objective] to study the effects of different management models on soil microbial carbon source utilization and functional diversity of natural secondary forest in Northeast China. To provide a scientific reference for determining the management mode of natural secondary forest in Northeast China. [methods] traditional forest management (FM1) and target tree forest management (FM2) in Danqing River Forest Farm in Harbin. The natural secondary forest of Northeast China with four management modes of adjusting forest management and forest management without disturbance, FM3) was set up three blocks in each stand (top, middle). Each plot was divided into 25 10 m 脳 10 m sample plots, and 0 ~ 20 cm soil layer samples were collected at the center of each sample. The Biolog-Eco microplate method was used to analyze the difference of carbon source utilization of soil microorganism in four kinds of forest land, and the effect of soil chemical properties on the utilization of soil microbial carbon source was discussed. [results] the soil microbial carbon source utilization of FM1 was the weakest and significantly different from the other three management models. [results] FM4 had the strongest utilization of soil microbial carbon source. The utilization of soil microbial carbon sources by FM2 and FM3 was between FM1 and FM4, and there was no significant difference between them. The chemical properties of soil have an important effect on the utilization of soil microorganism in different management models, among which alkali-hydrolyzed nitrogen, available potassium, available phosphorus, organic carbon and carbon nitrogen ratio are the main influencing factors. The results of analysis of soil microbial function diversity index of four management models showed that soil microbial functional diversity of FFM 1 was the lowest, FM2 and FM3 was the second largest. This may be related to four different cutting and tending measures. [conclusion] considering only soil microbial carbon source utilization and functional diversity. Non-interference management is the best management mode of natural secondary forest in Northeast China. However, considering the ecological benefit and economic benefit of forest management and the regeneration of forest land, adjusting the forest breeding method is the best management mode of natural secondary forest in Northeast China.
【作者单位】：广西大学林学院;中国林业科学研究院林业科技信息研究所;
【基金】：国家自然科学基金项目(31170593)
【分类号】：S714.3
【正文快照】： 我国东北地区蕴藏着丰富的天然林资源(冯宗炜等,1999),然而随着近现代以来的乱砍乱伐等不正当经营,东北地区的天然林资源大面积退化为天然次生林(赵宝珠等,1999;侯元兆等,2009)。天然次生林在水源涵养、水土保持以及生物多样性保护等方面具有重要生态价值(赵利群等,2006),近年

【相似文献】