海拔对黄山松阔叶混交林土壤微生物功能多样性的影响

发布时间：2018-05-05 14:59

本文选题：黄山松阔叶混交林 + 土壤微生物功能多样性　；参考：《南京林业大学学报(自然科学版)》2017年04期

【摘要】：【目的】研究浙江凤阳山黄山松阔叶混交林土壤理化性质以及微生物对碳源的利用状况,明确海拔变化对黄山松阔叶混交林林地土壤微生物功能多样性的影响。【方法】以黄山松在凤阳山的主要海拔分布范围(1 000~1 800 m)为准,选取中海拔(1 200 m)、中高海拔(1 500 m)、高海拔(1 800 m)3个海拔梯度,在每个海拔梯度的阳坡内选取排水较好、坡度较缓、长势适中的3个标准样地(20 m×20 m),采用Biolog Eco法研究该林分类型在不同海拔梯度下土壤微生物对碳源的利用特征,同时对土壤微生物利用各类碳源的特性进行非度量多维标度(NMDS)排序,进一步分析土壤微生物对各类碳源的利用情况。【结果】(1)在中高海拔处的土壤微生物活性最强,土壤微生物多样性指数随着海拔变化并无显著变化(P0.05);(2)研究区内土壤微生物主要利用的碳源类型为碳水化合物(CH)、氨基酸类(AA)、聚合物类(PM),各海拔处土壤微生物对酚酸类(PA)和胺类(AM)碳源的利用率均较低,而对羧酸类(CA)碳源的利用存在显著差异;NMDS排序显示,随海拔变化,土壤微生物对6类碳源的利用出现显著差异(P0.05);(3)土壤养分含量在中高海拔处最大,冗余分析显示土壤理化性质与土壤微生物对碳源的利用之间有较强的相关关系。【结论】中高海拔处土壤微生物对各类碳源的利用率都较高,土壤理化性质的改变是影响土壤微生物对碳源利用的重要因素。
[Abstract]:[Objective] to study the soil physical and chemical properties of the Mount Huangshan pine broadleaf mixed forest in Fengyang mountain of Zhejiang and the use of microbial carbon source, and to clarify the effect of altitude change on the functional diversity of soil microbial function in the mixed forest land of Mount Huangshan pine broad leaves. [method] the selection of Mount Huangshan pine in the main altitudes of Fengyang mountain (1 000~1 800 m) was selected. Naka Mi (1200 m), middle high altitude (1500 m), high elevation (1800 m) 3 elevation gradients, in each elevation gradient, the drainage is better, the slope is slower, and the 3 standard plots (20 m * 20 m) are moderate, and Biolog Eco method is used to study the utilization characteristics of soil microorganism to carbon source under different elevation gradient, and at the same time, the characteristics of the soil microorganism to carbon source are studied at the same time. Soil microbes use the characteristics of various carbon sources to order non metric multidimensional scaling (NMDS) to further analyze the utilization of soil microbes to various carbon sources. [results] (1) the soil microbial activity in the middle and high altitudes is the strongest, and the soil microbial diversity index does not change significantly along with the altitude (P0.05); (2) the soil in the study area The main types of carbon source used for soil microbes are carbohydrate (CH), amino acids (AA), and polymer (PM). The utilization rate of soil microbes to phenolic acids (PA) and amine (AM) carbon sources at all altitudes is low, while the use of carboxylic acid (CA) sources is significantly different. NMDS sequencing shows that soil microbes have 6 types of carbon sources with the elevation of altitude. There were significant differences (P0.05); (3) soil nutrient content was the largest at high altitude. Redundancy analysis showed that there was a strong correlation between soil physical and chemical properties and soil microbial utilization of carbon sources. [Conclusion] the utilization ratio of soil microorganisms to various carbon sources at high altitude was higher, and the change of soil physical and chemical properties affected soil. An important factor in the utilization of carbon sources by soil microbes.

【作者单位】：南方现代林业协同创新中心江苏省水土保持与生态修复重点实验室南京林业大学林学院;浙江凤阳山—百山祖国家级自然保护区凤阳山管理处;
【基金】：国家林业公益性行业科研专项项目(201504406) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：S714.3

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