|本期目录/Table of Contents|

[1]胡凯,王微,陶建平.细根对中亚热带森林几种优势树种凋落叶分解的影响[J].应用与环境生物学报,2019,25(03):640-647.[doi:10.19675/j.cnki.1006-687x.201807048]
 HU Kai,WANG Wei & TAO Jianping**.Effects of fine roots on the leaf litter decomposition of dominant tree species in mid-subtropical forests[J].Chinese Journal of Applied & Environmental Biology,2019,25(03):640-647.[doi:10.19675/j.cnki.1006-687x.201807048]
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细根对中亚热带森林几种优势树种凋落叶分解的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年03期
页码:
640-647
栏目:
研究论文
出版日期:
2019-06-25

文章信息/Info

Title:
Effects of fine roots on the leaf litter decomposition of dominant tree species in mid-subtropical forests
作者:
胡凯王微陶建平
1重庆文理学院林学与生命科学学院,微生物生态学研究所 永川 402168 2西南大学生命科学学院,三峡库区生态环境教育部重点实验室,重庆市三峡库区植物生态与资源重点实验室 北碚 400715
Author(s):
HU Kai1 WANG Wei1 & TAO Jianping2**
1 Institute of Microbial Ecology, College of Forestry and Life Science, Chongqing University of Arts and Sciences, Yongchuan 402168, China 2 Key Laboratory of Eco-environments of Three Gorges Reservoir Region (Ministry of Education), Chongqing Key Laboratory of Plant Ecology and Resources of Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China
关键词:
细根凋落叶分解速率微生物中亚热带森林
Keywords:
fine root leaf litter decomposition rate microbe mid-subtropical forest
分类号:
S718.5
DOI:
10.19675/j.cnki.1006-687x.201807048
摘要:
为深入理解森林生态系统中进入凋落物层生长的细根对凋落叶分解的影响,通过分解袋控制实验,以多花黑麦草(Lolium multiflorum)根系为研究对象,探讨细根对中亚热带森林中四川山矾、薯豆、香樟和马尾松等4种优势树种单一及其混合凋落叶分解速率的影响. 结果显示,进入分解袋中生长的活根生物量因凋落叶性质不同差异极显著(P < 0.001),其中薯豆分解袋中的细根在生长高峰期时生物量最大(131.5 mg/袋). 凋落物质量和细根存在与否以及二者的交互作用均对分解过程产生显著影响. 经过270 d的分解,生长进入分解袋中的细根能一定程度加速凋落叶分解,其中细根对薯豆凋落叶质量损失的相对贡献率最大(57.78%),而对马尾松的贡献率最小(6%),凋落叶初始C/N值显著影响细根对凋落叶质量损失的相对贡献率. 同一类型凋落叶在两种根处理条件下,凋落叶表面细菌及真菌群落结构均存在较大差异,有根处理能显著提高细菌群落的多样性及数量,且细根的存在及其吸收作用对3种阔叶树种凋落叶的混合分解产生协同效应. 本研究表明进入凋落物层生长的细根生物量与凋落叶初始质量相关,细根通过改变凋落叶表面分解者的群落结构与数量,并且主动调控其生长的养分需求从而加速分解. (图4 表7 参35)
Abstract:
To understand the influence of fine roots entering the litter layer on the decomposition of litter in the forest ecosystem, a simulation experiment using litterbags was conducted with the root system of Lolium multiflorum as the study object. The effects of living roots on the decomposition rate single and mixed leaf litters of dominant species of mid-subtropical forests were analyzed using the following species: Symplocos setchuensis, Elaeocarpus japonicus, Cinnamomum camphora, and Pinus massoniana. The results indicated that the biomass of the living roots penetrating the litterbags with various leaf litter differed significantly because of the litter quality (P < 0.001), and the fine roots in the litterbags of E. japonicus had the largest biomass at growth peak of the L. multiflorum (131.5 mg/bag). The litter quality, presence or absence of fine roots, and the interaction of the two had significant effects on the decomposition process. After 270 days of decomposition, the fine roots growing in the litter bag accelerated the decomposition of litter to some extent. The fine roots exhibited the largest contribution rate to the loss of the E. japonicus litter (57.78%), whereas the P. massoniana litter (6%) experienced the smallest contribution rate. The initial C/N ratio of litter significantly affected the relative contribution of fine roots to the litter mass loss. Considerable differences in the structure of bacterial and fungal communities on the surface of the leaf litter of the same type under the two root treatments were observed. Treatment with roots remarkably increased the diversity and quantity of bacterial communities, and the presence of fine roots and their absorption had synergistic effects on the mixed decomposition of the litter of three broad-leafed species. In summary, the biomass of fine roots entering the litter layer was related to the initial quality of the litter. The fine roots accelerate decomposition by altering the community structure of the litter surface decomposers and by actively regulating the nutrient requirements for their growth.

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更新日期/Last Update: 2019-06-25