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Contribution of soil fauna to the degradation of recalcitrant components in Cinnamomum camphora foliar litter in different-sized gaps in Pinus massoniana plantations

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Journal of Forestry Research 2019年第3期30卷 931-941页

作者： Yan zhang danju zhang Xun Li Jian zhang Institute of Ecology and Forestry College of Forestry Chengdu 611130People’s Republic of China Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River Chengdu 611130People’s Republic of China

Forest gaps are important in forest dynamics and management, but little is known about how soil fauna influence the degradation of recalcitrant litter components in different-sized forest gaps. This investigation uses litterbags with two different mesh sizes (0.04 and 3 mm) to control the meso- and microfauna entering the bags to quantify the contribution of soil fauna to the degradation of recalcitrant components (including condensed tannins, total phenol, lignin and cellulose) during litter decomposition. The experiment was conducted in seven different forest gap sizes in Pinus massoniana plantations over 1 year. One closed-canopy site (CC) and forest gap sizes of 100, 225, 400, 625, 900, 1225 and 1600 m^2 were created in a P. massoniana plantation in the Sichuan basin of China;the CC was treated as the control. Cinnamomum camphora foliage from local native trees was used in all forest gap experiments. We found the following:(1) Gap size had significant effects on the degradation rates (E) of condensed tannins and lignin and on the contributions of soil fauna;medium-sized gaps also presented high degradation rates. Soil fauna obviously contributed to the degradation of recalcitrant foliar litter components in medium-sized gaps.(2) The highest contribution to degradation (40.98%) was recorded for lignin, and the lowest contribution (0.29%) was recorded for condensed tannins. The results indicate that medium-sized gaps (900 m^2) were conducive to the degradation of recalcitrant litter components by soil fauna.

关键词： Cinnamomum camphora Foliar litter Gap size Pinus massoniana Recalcitrant litter components Soil fauna

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Understory plant diversity and phenolic allelochemicals across a range of Eucalyptus grandis plantation ages

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Journal of Forestry Research 2023年第5期34卷 1577-1590页

作者： Jinjin Li Yumei Huang Lianghua Chen Shun Gao Jian zhang danju zhang Sichuan Provincial Key Laboratory of Ecological Forestry Engineering College of ForestrySichuan Agricultural UniversityWenjiang 611130ChengduChina College of Landscape Architecture Sichuan Agricultural UniversityWenjiang 611130ChengduChina

Allelopathy is an important mechanism in Eucalyptus plantations that causes detrimental impacts on understory *** compounds are the main allelochemicals suppressing understory ***,the dynamic changes in phenolic allelochemicals and their relationship with understory diversity with increasing age of Eucalyptus plantations remain largely *** this study,the understory plant diversity was assessed and phenolic compounds identified from leaf litter,roots,and rhizosphere soil samples in a Eucalyptus grandis plantation at two-year intervals for ten years using ultra-performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS).The abundance and diversity of under story plant species were lowest in 4-year-old plantations and increased significantly with *** phenolic acids and 10 flavonoids were identified from leaf litter,roots,and rhizosphere *** of the potential phenolic allelochemicals,such as salicylic acid,gallic acid,4-hydroxybenzoic acid,and epicatechin,were more abundant in younger plantations,especially at4 years *** concentrations of phenolic compounds in the rhizosphere zone were significantly lower than in litter and root samples and did not change significantly with an increase in ***,phenolic compounds contributed more to the variation in the understory plants than soil *** acid,ellagic acid,quercetin,salicylic acid,and 4-hydroxybenzoic acid were the main phenolic compounds explaining the variation in plant diversity with plantation *** findings indicate that young *** plantations,especially at four years of age,merit a greater focus because of their lower understory plant diversity and higher allelopathic potential.

关键词： Eucalyptus grandis Phenolic compounds Understory plant diversity Plantation age

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Litter decomposition and the degradation of recalcitrant components in Pinus massoniana plantations with various canopy densities

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Journal of Forestry Research 2019年第4期30卷 1395-1405页

作者： Jie zhang danju zhang zhang Jian Hongyang Zhou Yanbo Zhao Daping Wei Key Laboratory of Ecological Forestry Engineering of Sichuan Province Institute of Ecology and ForestrySichuan Agriculture University

To understand the decomposition characteristics of Pinus massoniana foliar litter and the degradation of its refractory compounds in plantations under five canopy densities,a litter bag experiment over a decomposition time of 392 days was carried *** results show that canopy density significantly affected decomposition rates of litter and degradation rate of lignin and *** decomposition rates decreased significantly with decreasing canopy *** lignin and cellulose degradation rates were lower with canopy densities of 0.62 and 0.74 as compared with the three other *** and cellulose losses were more rapid in the first 118 *** fauna had significant impacts on litter decomposition and the degradation of refractory *** density had significant effects on factors such as soil properties and soil fauna community structure,which could be conducive to the decomposition of litter and the degradation of litter recalcitrant *** density between 0.6 and 0.7 might be a favorable management practice promoting litter decomposition and beneficial for the sustainable development of *** plantations.

关键词： Pinus massoniana Canopy density Litter decomposition Lignin Cellulose

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Characteristics of fungal community structure during the decomposition of mixed foliage litter from Pinus massoniana and broadleaved tree species in southwestern China

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Journal of Plant Ecology 2020年第5期13卷 574-588页

作者： Yan zhang Xun Li danju zhang Yu Qin Yang Zhou Simeng Song Jian zhang Key Laboratory of Ecological Forestry Engineering Institute of Ecology&ForestrySichuan Agricultural University611130 ChengduChina Collaborative Innovation Center of Ecological Security in the Upper Reaches of the Yangtze River Sichuan Agricultural UniversityChengdu 611130China

Aims The conifer litter is fairly recalcitrant and nutrient poor,and broadleaved litter promotes coniferous litter decomposition by increasing degradable nutrients and promoting microbial *** Pinus massoniana litter and three broadleaved litters may increase the diversity and abundance of fungal decomposers compared with those in *** litter and vary depending on the number and proportion of broadleaved species *** We analysed the composition and diversity of fungal communities during mixed litter decomposition in southwestern China with 35 treatments(***,Toona sinensis,Cinnamomum camphora and Sassafras tzumu litter)using Illumina high-throughput *** Findings The mixed litters increased fungal diversity and richness compared with those in the single-species litter,except in the following treatments:*** litter accounting for 70%-80%in the ***+***,***+***+*** and ***+***+*** combinations,and ***+***+***+*** combination with small proportion of *** *** diversity and richness of the 7:1:2 combination of ***+***+*** were significantly higher than those in the other *** and Basidiomycota were the dominant phyla,and Aspergillus was the most abundant *** decomposition of litters from one needleleaf and one broadleaved species(6:4)and one needleleaf species and two broadleaved species(broadleaved litter accounting for 30%-40%)exhibited synergistic interactions throughout the decomposition process,and the relative abundance of fungi that decompose refractory substances *** ***+***+*** combination and a 30%-40%broadleaf litter proportion increased fungal diversity and accelerated the decomposition of recalcitrant coniferous ***,*** and *** are a potential candidate species for mixed planting with ***

关键词： fungal community mixed leaf litter non-additive effect Pinus massoniana high-throughput sequencing

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Physiological and biomass partitioning shifts to water stress under distinct soil types in Populus deltoides saplings

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Journal of Plant Ecology 2020年第5期13卷 545-553页

作者： Senlin Yang Jian Shi Lianghua Chen Jian zhang danju zhang Zhenfeng Xu Jiujin Xiao Peng Zhu Yang Liu Tiantian Lin Li zhang Hanbo Yang Yu Zhong Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River&Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130China

Aims Although soil environments exist extensive heterogeneity for many plants with a wide range of distribution,researches about effects of soil conditions on plants’tolerance and adaptation are particularly *** our study,the aims are to reveal physiological strategies of Populus deltoides against drought stress under different soil conditions and to select the most suitable soil type for *** *** Under controlled conditions,we used *** as a model species to detect differences in gas exchange rate,antioxidative capacity,nitrogen metabolism and biomass accumulation and partitioning in response to drought stress under three mineral soil types with distinct physicochemical characters,*** soil(RS),yellow soil(YS)and yellow-brown soil(BS).Important Findings Exposure to 25%of field water holding capacity in soil for 3 months had significantly decreased biomass of all organs,photosynthetic rate,enzyme activities related to N assimilation,but increased H2O2,malondialdehyde and content of both NO3−and NH4+,when *** was planted in both RS and *** contrast,under BS,there are slightly negative effects exerted by water deficit on total biomass,gas exchange rate,activities of enzymes related to nitrogen metabolism and membrane damage caused by reactive oxygen species,which can be associated with a consistent increase in superoxide dismutase,peroxidase and catalase,and a higher ratio of root mass to shoot *** is concluded that,such higher capacity in tolerance and adaptation against drought stress under BS relative to both RS and YS could be accounted for more sufficient nutrient provision in soil parental materials and better soil aeration conditions which play a vital role in plant acclimation to water *** study also revealed that,distribution areas of BS might be preferable for cultivation of ***,when compared with those of RS and YS.

关键词： drought stress abiotic stress Populus soil type nitrogen metabolism

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Effects of litter aqueous extract from Eucalyptus grandis plantations on the growth and physiological indicators of Eiseniafetida

Effects of litter aqueous extract from Eucalyptus grandis pl...

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中国第九届植物化感作用学术研讨会

作者： YU Junli zhang Jian WANG Chunzi TANG Zhiqun LI Jinjin zhang danju Institute of Ecology & Forestry Key Laboratory of Ecological Forestry Engineering in Sichuan ProvinceSichuan Agricultural University

We selected a chronosequence of Eucalyptus grandis plantations(2,4,6,8,10 years old) in Danling County,Sichuan Province to evaluate the effects of *** on *** growth indicators(survival rate,growth index),protein content,activity of antioxidant enzymes(SOD,GST) and enzyme activity related to the nervous system(AChE) of Eiseniafetidaand the content of MDA were *** results showed that:The survival rate of earthworms did not change significantly when thelitter aqueous extracts were added into the abandoned soils,but the weight of earthworms was inhibited with the increasing of exposure *** proteins content of the earthworms were promoted under the treatments of higher litter aqueous extractsof 2 and 8 years old *** MDA contents of earthworms increased significantly when treated with litter extracts of 8 and 10 years old stands,but the AChE activities decreased under the treatment of 4 years old stands and then *** all,the GST activities were inhibited while increased significantly when treated with litter extracts of 4 years old stands;the SOD activities decreased significantly under the treatment of 4 years old *** survival rate of earthworms did not change significantly when they were treated only forest soils,but the weight of earthworms were inhibited with increasing of exposure time and it was decreased significantly on 4-6 years old at 14-day exposures but increased at 28-day exposures with increasing of plantation *** protein contents of the earthworms had no significant changes with increasing of plantation ages and concentrations;the MDA contents and the AChE activities were increased significantly in the litter extracts of 10 years old stands;the SOD activities were lower with the litter extracts of 4 or 10 years old stands and the GST activities showed a fluctuations *** the litter extracts were added into the different aged soils,it had no significant effects on survival rate o

关键词： Eucalyptus grandis plantations a range of plantation ages litter Eiseniafetida growth and physiological indicators

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3个树种与巨桉混交土壤理化性质、凋落物量和养分含量特征

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应用与环境生物学报 2015年第5期21卷 948-953页

作者：赵燕波纪托未张丹桔张健四川农业大学生态林业研究所四川省林业生态工程重点实验室成都611130

比较3年半生的红椿、台湾桤木、檫木与巨桉混交的混交林和巨桉纯林的土壤理化性质、凋落物量和养分含量特征.结果表明:红椿、台湾桤木和巨桉混交都有助于减缓土壤的酸化.檫木与巨桉混交能显著改善土壤容重、持水量、孔隙状况,檫木与巨... 详细信息

比较3年半生的红椿、台湾桤木、檫木与巨桉混交的混交林和巨桉纯林的土壤理化性质、凋落物量和养分含量特征.结果表明:红椿、台湾桤木和巨桉混交都有助于减缓土壤的酸化.檫木与巨桉混交能显著改善土壤容重、持水量、孔隙状况,檫木与巨桉混交也能显著增加土壤的全C、N、P、K含量,分别增加了64.7%、41.9%、28.6%、7.7%.台湾桤木与巨桉混交也能显著增加土壤的全C、N、P含量,分别增加了15.2%、27.9%、47.6%.3种混交林土壤水解N都显著低于巨桉纯林,有效P都显著高于巨桉纯林,只有台湾桤木与巨桉混交能显著增加土壤速效K含量,其他两种混交林土壤速效K较纯林显著降低.巨桉红椿混交林凋落物枝、叶现存量都显著高于巨桉纯林,巨桉檫木混交林凋落叶量、凋落物总量略低于巨桉纯林,分别降低了9.8%、9.3%.巨桉台湾桤木混交林凋落物枝、叶现存量都显著低于巨桉纯林.3种混交林凋落物中C元素含量都显著低于巨桉纯林,N元素含量都显著高于巨桉纯林,台湾桤木与巨桉混交能显著增加凋落物中P元素含量,檫木与巨桉混交能显著增加凋落物中K元素的含量.综合考虑各项指标,在此类混交模式下为巨桉选择混交树种,檫木相对最优,台湾桤木次之,红椿则不宜.

关键词：巨桉混交林土壤理化性质凋落物量养分含量

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北美水禽管理计划(NAWMP)及其对中国湿地生态环境建设的启示

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生态学杂志 2006年第8期25卷 989-993页

作者：张丹桔宫渊波李贤伟四川农业大学林学园艺学院雅安625014

保护水禽栖息的湿地已成为全球湿地生态系统研究的热点。本文阐述了北美水禽管理计划(NAWMP)的形成条件、遵循原则和设计理念,总结其该计划在共同管理、联合攻坚、资金积累等方面所取得的成功经验,并以PPJV草原沼泽保护合作项目为例分... 详细信息

保护水禽栖息的湿地已成为全球湿地生态系统研究的热点。本文阐述了北美水禽管理计划(NAWMP)的形成条件、遵循原则和设计理念,总结其该计划在共同管理、联合攻坚、资金积累等方面所取得的成功经验,并以PPJV草原沼泽保护合作项目为例分析了其在国际合作方面取得的突出成就;分析了中国水禽栖息地的湿地生态系统所面临的问题与挑战,提出应借鉴北美水禽管理计划的设计理念和成功经验,在湿地保护区共管、当地政府和当地社区参与及国际合作等方面需不断完善,并对中国湿地监测体系的建立、湿地开发方案的制定、对群众的宣传教育等方面提出了相应对策。

关键词： NAWMP 水禽栖息地保护管理

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轮伐期前后不同密度巨桉(Eucalyptus grandis)人工林土壤动物群落结构特征

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生态学报 2020年第3期40卷 808-821页

作者：张阿娟张健李金金刘志刚张丹桔四川农业大学生态林业研究所林业生态工程省级重点验室

在前期巨桉(***)人工林土壤生物多样性在轮伐期前(4年左右)降低,此后随林龄显著升高的研究基础上,在四川省丹棱县选择轮伐期前即4年和轮伐期后即8年的不同密度(D1:2000, D2:1600, D3:1200株/hm^2)巨桉人工林,研究了其土壤动物群落结构... 详细信息

在前期巨桉(***)人工林土壤生物多样性在轮伐期前(4年左右)降低,此后随林龄显著升高的研究基础上,在四川省丹棱县选择轮伐期前即4年和轮伐期后即8年的不同密度(D1:2000, D2:1600, D3:1200株/hm^2)巨桉人工林,研究了其土壤动物群落结构特征。结果显示:1)共捕获土壤动物2904只,隶属于4门8纲22目70科,其中大型土壤动物541只,以蚁科和康叭科为优势类群;中小型土壤动物2363只,以大翼甲螨科、等节虫兆科和线虫为优势类群。2)土壤动物类群数、个体数和密度随林分密度和林龄具有显著差异,4年生林地大型土壤动物个体数随密度降低显著增加,8年生巨桉人工林中小型土壤动物个体数及类群数随密度降低均显著增加;土壤动物个体数及类群数除D1密度时4年高于8年,其余密度均表现为8年高于4年。3)林分密度对土壤动物多样性指数有显著影响,4年生林地大型土壤动物Margalef丰富度指数随密度降低显著增加,8年巨桉人工林中小型土壤动物Shannon-wiener指数及Margalef丰富度指数随密度降低显著升高。4)巨桉人工林大型土壤动物以杂食性为主,枯食性次之,中小型土壤动物以腐食性为主,杂食性次之。5)RDA分析显示,林分密度、土壤含水量和土壤pH为对土壤动物的主要作用环境因子,4年时对奥甲螨科、长角长虫兆科、寄螨科、隐翅甲科、丽甲螨科等类群影响较大;8年时对线虫、蜚蠊科、康叭科、厉螨科、棘虫兆科等类群影响较大。为此,延长轮伐期、降低林分密度可改善巨桉人工林土壤动物生境、增加土壤动物多样性、促进土壤动物群落结构稳定性。

关键词：巨桉人工林轮伐期林分密度土壤动物群落特征

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林窗边缘效应对马尾松和香樟凋落叶分解的影响

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应用与环境生物学报 2017年第3期23卷 570-578页

作者：李勋张丹桔张艳张健宋思梦周扬刘华四川农业大学林学院生态林业研究所生态林业工程重点实验室长江上游生态安全协同创新中心成都611130

为了解马尾松(Pinus massoniana)人工林不同面积林窗边缘凋落叶分解的养分释放规律,采用凋落袋分解实验,以长江上游低山丘陵区人为采伐形成的马尾松人工林7种不同大小林窗(G1:100 m^2;G2:225 m^2;G3:400 m^2;G4:625 m^2;G5:900 m^2;G6:1... 详细信息

为了解马尾松(Pinus massoniana)人工林不同面积林窗边缘凋落叶分解的养分释放规律,采用凋落袋分解实验,以长江上游低山丘陵区人为采伐形成的马尾松人工林7种不同大小林窗(G1:100 m^2;G2:225 m^2;G3:400 m^2;G4:625 m^2;G5:900 m^2;G6:1 225 m^2;G7:1 600 m^2)为研究对象,以林下为对照,探讨马尾松和香樟(Cinnamomum camphora)凋落叶的质量损失率和养分释放率.结果表明:除钾释放率外,林窗边缘两种凋落叶的质量损失率和养分释放率均显著高于林下.在1.5年分解过程中,两种凋落叶的质量损失率和碳释放率呈持续上升趋势.分解前90 d,两种凋落叶的质量损失速率和养分释放速率最快;分解90-360 d后,部分林窗出现氮和磷的富集现象;180-270 d和1.5年后,部分林窗出现钾的富集现象.随林窗面积增大,除钾释放率外,两种凋落叶在中型林窗边缘(400、600和900 m^2)具有较高的质量损失率和养分释放率.在凋落叶分解过程中,质量损失率和碳、氮释放率与土壤含水率均呈显著正相关.中型林窗(400-900 m^2)对凋落物的分解具有更显著的边缘效应,而这种边缘效应与物种有一定关联.因此,在马尾松低效林改造过程中,可利用中型林窗(400-900 m^2)边缘这一显著作用,引入乡土阔叶树种加速马尾松人工林的物质循环,维持林分地力.

关键词：林窗边缘效应凋落叶质量损失养分释放马尾松香樟

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