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引用本文:张冰冰,万晓华,杨军钱,王涛,黄志群.Effects of Litters Different in Quality on Soil Microbial Community Structure in Cunninghamia lanceolata Plantation[J].Acta Pedologica Sinica,2021,58(4):1040-1049. DOI:10.11766/trxb201912260562
ZHANG Bingbing,WAN Xiaohua,YANG Junqian,WANG Tao,HUANG Zhiqun.Effects of Litters Different in Quality on Soil Microbial Community Structure in Cunninghamia lanceolata Plantation[J].Acta Pedologica Sinica,2021,58(4):1040-1049. DOI:10.11766/trxb201912260562
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不同凋落物质量对杉木人工林土壤微生物群落结构的影响
张冰冰, 万晓华, 杨军钱, 王涛, 黄志群
福建师范大学地理科学学院, 湿润亚热带山地生态国家重点实验室培训基地, 福州 350007
摘要:
凋落物是森林生态系统的重要组成部分。对福建南平峡阳林场7年生二代杉木人工林生态系统进行添加8种不同凋落物处理3年后,分析不同质量凋落物对土壤微生物群落组成的影响。结果表明:(1)添加高质量的桉树凋落物会使土壤磷脂脂肪酸总量、革兰氏阳性、阴性细菌生物量比添加杉木凋落物分别增加了27%、35%和19%,而添加低质量的樟树凋落物使得土壤磷脂脂肪酸总量和革兰氏阴性细菌较杉木显著降低29%和10%。(2)桉树凋落物添加下土壤真菌/细菌比(0.14)显著高于其他凋落物添加的比值,樟树凋落物添加下土壤的革兰氏阳性细菌/革兰氏阴性细菌比(1.64)显著高于其他凋落物添加处理的比值。(3)不同质量凋落物添加处理对土壤pH和碳氮比无显著影响。毛竹凋落物添加下土壤中硝态氮含量最高。(4)相关性分析表明,凋落物碳含量与土壤中脂肪酸总量、革兰氏阳性细菌、革兰氏阴性细菌、真菌和菌根真菌具有正相关关系。烷基碳(Alkyl C)与脂肪酸总量、革兰氏阳性、阴性细菌、细菌、真菌及真菌细菌比均有正相关性。甲氧基碳(N-alkyl C)、氧烷基碳(O-alkyl C)和芳碳(Aryl C)与革兰氏阳性阴性细菌比呈显著正相关。冗余分析表明,烷基碳(Alkyl C)与16:1ω7c、18:1ω7c、18:2ω6c、18:1ω9显著正相关,对土壤微生物群落结构有显著影响。可见,不同树种之间凋落物烷基碳组分的差异是影响土壤微生物生物量和群落组成的重要指标。
关键词:  杉木人工林  凋落物质量  凋落物分解  土壤理化性质  土壤微生物
DOI:10.11766/trxb201912260562
分类号:S718.5
基金项目:国家自然科学基金项目(31570604和31600495)、国家杰出青年基金项目(31232212)和福建省自然科学基金面上项目(2018J01714)资助
Effects of Litters Different in Quality on Soil Microbial Community Structure in Cunninghamia lanceolata Plantation
ZHANG Bingbing, WAN Xiaohua, YANG Junqian, WANG Tao, HUANG Zhiqun
School of Geographical Science, Fujian Normal University, Cultivation Base of State Key Laboratory of Subtropical Mountain Ecology, Fuzhou 350007, China
Abstract:
[Objective] Litter is an important part of a forest ecosystem. It is of great significance for scientific regulation of a plantation ecosystem to study effects of litters different in quality on soil microbial community composition in the plantation.[Method] To that end, a three-year litter amendment experiment was carried out in a 7-year-old secondary Cunninghamia lanceolata plantation in Xiayang Forest Farm located in Nanping, Fujian, China. The experiment was designed to have eight treatments amended with litters different in quality, separately. Three years later, soil samples were collected from the treatments for analysis, separately, of variation of soil microbial community composition in each treatment.[Result] Results show:(1) the treatment of amending litter of Eucalyptus robusta, high in quality, was 27%, 35% and 19% higher than the treatment of amending litter of Cunninghamia lanceolata, respectively, in soil total microbial biomass, gram-positive bacterial biomass and gram-negative bacterial biomass, while the treatment of amending litter of Cinnamomum bodinieri low in quality, was 29% and 10% lower, respectively, than the treatment of amending litter of Cunninghamia lanceolate in soil total Phospholipid fatty acid and gram-negative bacterial biomass; (2) The soil fungi/bacteria ratio (0.14) was significantly higher in the treatment of amending litter of Eucalyptus robusta than in all the other treatments, and the Gram-positive/Gram-negative bacteria ratio (1.64) was significantly higher in the treatment of amending litter of Cinnamomum bodinieri than in all the others; (3) Amendment of litters, regardless of quality, had no significant effect on soil pH and soil carbon/nitrogen ratio, and the treatment of amending litter of Phyllostachys heterocycla was the highest in nitrate-N content; and (4) Correlation analysis shows that litter carbon content was positively related to total fatty acid, Gram-positive bacterial biomass, Gram-negative bacterial biomass, fungal biomass, and mycorrhizal fungal biomass. Alkyl carbon was positively related to total fatty acid, Gram-positive and -negative bacteria, bacteria, fungi and fungi/bacteria ratio. Methoxy carbon (N-alkyl C), oxy alkyl carbon(O-alkyl C) and aromatic carbon (Aryl C) was significantly and positively related to Gram-positive/Gram-negative bacteria ratio. Redundancy analysis shows that Alkyl C content was positively related to Gram-negative bacteria (16: 1ω7c, 18: 1ω7c) and fungi (18: 2ω6c, 18: 1ω9). Alkyl C content in the litter had a significant effect on soil microbial community structure.[Conclusion] The difference between the litters in alkyl carbon composition is an important index affecting soil microbial biomass and community composition.
Key words:  Cunninghamia lanceolata plantation  Litter quality  Litter decomposition  Soil physical and chemical properties  Soil microorganism