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Understory seedlings of Quercus mongolica survive by phenological escape

Forest Ecosystems 2024年第2期11卷 236-246页

作者： Shixiong Wu Ying Liu Lulu He Wei Zeng Qijing Liu College of Forestry Beijing Forestry UniversityBeijing100083China

Understanding understory seedling regeneration mechanisms is important for the sustainable development of temperate primary forests in the context of increasingly intense climate warming events.The poor regeneration of dominant tree species,however,is one of the biggest challenges it faces at the moment.Especially,the regeneration of the shade-intolerant Quercus mongolica seedling is difficult in primary forests,which contrasts with the extreme abundance of understory seedlings in secondary forests.The mechanism behind the interesting phenomenon is still unknown.This study used in-situ monitoring and nursery-controlled experiment to investigate the survival rate,growth performance,as well as nonstructural carbohydrate (NSC) concentrations and pools of various organ tissues of seedlings for two consecutive years,further analyze the understory light availability and simulate the foliage carbon (C) gain in the secondary and primary forest.Results suggested that seedlings in the secondary forest had greater biomass allocation aboveground,height and specific leaf area (SLA) in summer,which allowed the seedling to survive longer in the canopy closure period.High light availability and positive C gain in early spring and late autumn are key factors affecting the growth and survival of understory seedlings in the secondary forest,whereas seedlings in the primary forest had annual negative carbon gain.Through the growing season,the total NSC concentrations of seedlings gradually decreased,whereas those of seedlings in the secondary forest increased significantly in autumn,and were mainly stored in roots for winter consumption and the following year's summer shade period,which was verified by the nursery-controlled experiment that simulated autumn enhanced light availability improved seedling survival rate and NSC pools.In conclusion,our results revealed the survival trade-off strategies of Quercus mongolica seedlings and highlighted the necessity of high light availability during the spring and autumn phenological periods

关键词： Carbon gain Nonstructural carbohydrate Recruitment Trade-off Biomass allocation

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Allele-aware chromosome-scale assembly of the allopolyploid genome of hexaploid Ma bamboo(Dendrocalamus latiflorus Munro)

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Journal of Integrative Plant Biology 2022年第3期64卷 649-670页

作者： Yushan Zheng Deming Yang Jundong Rong Liguang Chen Qiang Zhu Tianyou He Lingyan Chen Jing Ye Lili Fan Yubang Gao Hangxiao Zhang Lianfeng Gu College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002China college of Landscape Architecture Fujian Agriculture and Forestry UniversityFuzhou 350002China Basic forestry and Proteomics Research Center College of ForestryFujian Provincial Key Laboratory of Haixia Applied PlantSystems BiologyFujian Agriculture and Forestry UniversityFuzhou 350002China

Dendrocalamus latiflorus Munro is a woody clumping bamboo with rapid shoot growth.Both genetic transformation and clustered regularly interspaced short palindromic repeats(CRISPR)/CRISPR-associated protein 9(Cas9)gene editing techniques are available for D.latiflorus,enabling reverse genetic approaches.Thus,D.latiflorus has the potential to be a model bamboo species.However,the genome sequence of D.latiflorus has remained unreported due to its polyploidy and large genome size.Here,we sequenced the D.latiflorus genome and assembled it into three allele-aware subgenomes(AABBCC),representingthe largest genome of a major bamboo species.We assembled 70 allelic chromosomes(2,737 Mb)for hexaploid D.latiflorus using both singlemolecule sequencing from the Pacific Biosciences(Pac Bio)Sequel platform and chromosome conformation capture sequencing(Hi-C).Repetitive sequences comprised 52.65%of the D.latiflorus genome.We annotated 135231 protein-coding genes in the genome based on transcriptomes from eight different tissues.Transcriptome sequencing using RNA-Seq and Pac Bio singlemolecule real-time long-read isoform sequencing revealed highly differential alternative splicing(AS)between non-abortive and abortive shoots,suggesting that AS regulates the abortion rate of bamboo shoots.This high-quality hexaploid genome and comprehensive strand-specific transcriptome datasets for this Poaceae family member will pave the way for bamboo research using D.latiflorus as a model species.

关键词： alternative splicing bamboo shoots chromosome conformation capture sequencing D.latiflorus genome assembly single-molecular sequencing

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Development of an efficient expression system with large cargo capacity for interrogation of gene function in bamboo based on bamboo mosaic virus

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Journal of Integrative Plant Biology 2023年第6期65卷 1369-1382页

作者： Yandong Jin Baijie Wang Mingchuan Bao Yujie Li Shengwu Xiao Yuhua Wang Jun Zhang Liangzhen Zhao Hangxiao Zhang Yau-Heiu Hsu Mingjie Li Lianfeng Gu College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002China Basic forestry and Proteomics Research Center School of Future TechnologyCollege of ForestryFujian Agriculture and Forestry UniversityFuzhou 350002China Graduate Institute of Biotechnology Chung Hsing UniversityTaichung 40227China college of crop science Fujian Agriculture and Forestry UniversityFuzhou 350002China

Bamboo is one of the fastest growing plants among monocotyledonous species and is grown extensively in subtropical regions.Although bamboo has high economic value and produces much biomass quickly,gene functional research is hindered by the low efficiency of genetic transformation in this species.We therefore explored the potential of a bamboo mosaic virus(BaMV)-mediated expression system to investigate genotype-phenotype associations.We determined that the sites between the triple gene block proteins(TGBps)and the coat protein(CP)of BaMV are the most efficient insertion sites for the expression of exogenous genes in both monopodial and sympodial bamboo species.Moreover,we validated this system by individually overexpressing the two endogenous genes ACE1 and DEC1,which resulted in the promotion and suppression of intemode elongation,respectively.In particular,this system was able to drive the expression of three 2A-linked betalain biosynthesis genes(more than 4 kb in length)to produce betalain,indicating that it has high cargo capacity and may provide the prerequisite basis for the development of a DNA-free bamboo genome editing platform in the future.Since BaMV can infect multiple bamboo species,we anticipate that the system described in this study will greatly contribute to gene function research and further promote the molecular breeding of bamboo.

关键词： ACE1 bamboo BaMV-mediated overexpression DEC1 expression virus-mediated genome editing

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Effects of drought on non-structural carbohydrates and C,N,and P stoichiometric characteristics of Pinus yunnanensis seedlings

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Journal of forestry Research 2024年第1期35卷 90-102页

作者： Zhijuan Zhao Lina Wang Yuanxi Liu Jianli Sun Jiandong Xiao Qiong Dong Lianfang Li Wanjie Zhang Chao Wang Junwen Wu College of Forestry Southwest Forestry UniversityKunming 650224YunnanPeople’s Republic of China

To study non-structural carbohydrate character-istics and nutrient utilization strategies of Pinus yunnanen-sis under continuous drought conditions,2-year-old seed-lings were planted in pots with appropriate water,light and moderate and severe drought treatments[(80±5),(65±5),(50±5),and(35±5)%of field water-holding capacity].Non-structural carbohydrates,carbon(C),nitrogen(N),and phosphorus(P)concentrations were measured in each plant component.The results show that:(1)With increasing drought,non-structural carbohydrates gradually increased in leaves,stems,and coarse roots,while gradually decreased in fine roots;(2)C concentrations of all were relatively stable under different stress levels.Phosphorous utilization of each component increased under light and moderate drought conditions,while N and P utilization efficiency of each plant component decreased under severe drought.Growth was mainly restricted by N,first decreasing and then increasing with increased drought;(3)There was a correlation between the levels of non-structural carbohydrates and C,N,and P in each component.Changes in N concentration affected the interconversion between soluble sugar and starch,which play a regulatory role in the fluctuation of the concentration of non-structural carbohydrates;and,(4)Plasticity analysis showed that P.yunnanensis seedlings responded to drought mainly by altering starch concentration,the ratio of soluble sugar to starch in leaves and stems,and further by alter-ing N and P utilization efficiencies.Overall,these results suggest that the physiological activities of all organs of P.yunnanensis seedlings are restricted under drought and that trade-offs exist between different physiological indicators and organs.Our findings are helpful in understanding non-structural carbohydrate and nutrient adaptation mechanisms under drought in P.yunnanensis seedlings.

关键词： Pinus yunnanensis seedlings Drought Non-structural carbohydrates C,N,P stoichiometric characteristics

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Leaf hydraulics coordinated with leaf economics and leaf size in mangrove species along a salinity gradient

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Plant Diversity 2023年第3期45卷 309-314页

作者： Jing-Jing Cao Jing Chen Qing-Pei Yang Yan-Mei Xiong Wei-Zheng Ren De-Liang Kong College of Forestry Henan Agricultural UniversityZhengzhou450002China Research Institute of Tropical forestry Chinese Academy of ForestryGuangzhou510520China

Independence among leaf economics,leaf hydraulics and leaf size confers plants great capability in adapting to heterogeneous environments.However,it remains unclear whether the independence of the leaf traits revealed across species still holds within species,especially under stressed conditions.Here,a suite of traits in these dimensions were measured in leaves and roots of a typical mangrove species,Ceriops tagal,which grows in habitats with a similar sunny and hot environment but different soil salinity in southern China.Compared with C.tagal under low soil salinity,C.tagal under high soil salinity had lower photosynthetic capacity,as indicated directly by a lower leaf nitrogen concentration and higher water use efficiency,and indirectly by a higher investment in defense function and thinner palisade tissue;had lower water transport capacity,as evidenced by thinner leaf minor veins and thinner root vessels;and also had much smaller single leaf area.Leaf economics,hydraulics and leaf size of the mangrove species appear to be coordinated as one trait dimension,which likely stemmed from covariation of soil water and nutrient availability along the salinity gradient.The intraspecific leaf trait relationship under a stressful environment is insightful for our understanding of plant adaption to the multifarious environments.

关键词： Leaf hydraulics Leaf economics Plant size Salty stress Ecophysiology Mangrove Intraspecific

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Effects of organic mulching on soil aggregate stability and aggregate binding agents in an urban forest in Beijing, China

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Journal of forestry Research 2022年第3期33卷 1083-1094页

作者： Wei Zhou Xiangyang Sun Suyan Li Tiantian Du Yi Zheng Zhihui Fan College of Forestry Beijing Forestry UniversityBeijing100083People’s Republic of China

Urban forest soil is often disturbed by rapid urbanization. Organic mulching is effective for improving soil quality and aggregate stability. This study evaluated how soil binding agents changed aggregate stability through organic mulching in urban forest soils. Three treatments were applied in Jiufeng National Forest Park, Beijing: (1) no organic mulch (control);(2) wood chips alone (5 cm thickness);and, (3) wood chips + wood compost (This mulch was divided into two layers, the upper layer of wood chips (2.5 cm), the lower layer wood compost (2.5 cm)). Soil samples were collected from the surface 10- cm soil layer and fraction into four aggregates. Glomalin-related soil protein and soil organic carbon were measured in bulk soil and the four aggregates. The results show that wood chips + wood compost increased the proportion of large and small macroaggregates, mean weight diameter and geometric mean diameter. The total and easily extractable glomalin-related soil protein were higher in the wood chips + wood compost. However, soil organic carbon was lower in the wood chips alone application compared to the controls and wood chips + wood compost. Easily extractable / total glomalin-related soil protein and glomalin-related soil protein / soil organic carbon ratios of wood chips alone and wood chips + wood compost had increased trend compared to the controls but did not reach significant levels (p > 0.05). Mean weight diameter and geometric mean diameter correlated positively with total and easily extractable glomalin-related soil protein but were not positively correlated with soil organic carbon, the ratios of easily extractable and total glomalin-related soil protein, and the ratios of glomalin-related soil protein and soil organic carbon. Redundancy analysis revealed that total glomalin-related soil protein was the most important driver for soil aggregate stability, especially the total glomalin-related soil protein of small macroaggregates. The results suggest that wood chips + wood compost enhanced soil aggreg

关键词： Organic mulching Soil aggregate stability Soil binding agents Glomalin-related soil protein(GRSP) Soil organic carbon(SOC)

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R在林业研究中的应用

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Journal of Plant Ecology 2023年第6期16卷 249-258页

作者： Jiangshan Lai Weijie Zhu Dongfang Cui Dayong Fan Lingfeng Mao college of Ecology and Environment Nanjing Forestry UniversityNanjing 210037China Research Center of Quantitative Ecology Nanjing Forestry UniversityNanjing 210037China College of Forestry Beijing Forestry UniversityBeijing 100083China

R是用于数据分析、建模和可视化的强大编程语言之一,广泛运用于各个科学学科,但其林学研究领域受欢迎程度还尚待探索。为了回答这个问题,我们对8种主要林学期刊上2013至2022年间发表的14800多篇研究文章R和R包的使用频率进行了全面分析... 详细信息

R是用于数据分析、建模和可视化的强大编程语言之一,广泛运用于各个科学学科,但其林学研究领域受欢迎程度还尚待探索。为了回答这个问题,我们对8种主要林学期刊上2013至2022年间发表的14800多篇研究文章R和R包的使用频率进行了全面分析。分析结果显示,有6700篇文章(占总数的45.7%)明确使用R进行数据分析。R的使用率呈现出持续增长的趋势,从2013年的28.3%上升到2022年的60.9%。使用最多的5个R软件包包括vegan、lme4、nlme、MuMIn和ggplot2。各期刊的关注点有所不同导致R软件包使用频率格局不同。该分析表明,R语言凭借其强大的统计和数据可视化功能,在林学各个领域具有广阔的使用前景。

关键词：数据分析林业研究开源 R语言与 R软件包 R编程

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Reconstructing historical forest fire risk in the non-satellite era using the improved forest fire danger index and long short-term memory deep learning-a case study in Sichuan Province,southwestern China

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Forest Ecosystems 2024年第1期11卷 87-99页

作者： Yuwen Peng Huiyi Su Min Sun Mingshi Li Co-Innovation Center for Sustainable forestry in Southern China Nanjing Forestry UniversityNanjing 210037China College of Forestry Nanjing Forestry UniversityNanjing 210037China

Historical forest fire risk databases are vital for evaluating the effectiveness of past forest management approaches,enhancing forest fire warnings and emergency response capabilities,and accurately budgeting potential carbon emissions resulting from fires.However,due to the unavailability of spatial information technology,such databases are extremely difficult to build reliably and completely in the non-satellite era.This study presented an improved forest fire risk reconstruction framework that integrates a deep learning-based time series prediction model and spatial interpolation to address the challenge in Sichuan Province,southwestern China.First,the forest fire danger index(FFDI)was improved by supplementing slope and aspect information.We compared the performances of three time series models,namely,the autoregressive integrated moving average(ARIMA),Prophet and long short-term memory(LSTM)in predicting the modified forest fire danger index(MFFDI).The bestperforming model was used to retrace the MFFDI of individual stations from 1941 to 1970.Following this,the Anusplin spatial interpolation method was used to map the distributions of the MFFDI at five-year intervals,which were then subjected to weighted overlay with the distance-to-river layer to generate forest fire risk maps for reconstructing the forest fire danger database.The results revealed LSTM as the most accurate in fitting and predicting the historical MFFDI,with a fitting determination coefficient(R^2)of 0.709,mean square error(MSE)of0.047,and validation R^2 and MSE of 0.508 and 0.11,respectively.Independent validation of the predicted forest fire risk maps indicated that 5 out of 7 historical forest fire events were located in forest fire-prone areas,which is higher than the results determined from the original FFDI(2 out of 7).This proves the effectiveness of the improved MFFDI and indicates a high level of reliability of the historical forest fire risk reconstruction method proposed in this study.

关键词： Forest fire risk reconstruction MFFDI Time series models LSTM ARIMA Prophet Anusplin

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Spatio-temporal Evolution Characteristics and Driving Forces of Winter Urban Heat Island:A Case Study of Rapid Urbanization Area of Fuzhou City,China

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Chinese Geographical Science 2024年第1期34卷 135-148页

作者： WANG Zili LU Chunyan SU Yanlin SU Yue YU Qianru LI Wenzhe YANG Nuocheng college of Computer and Information Sciences Fujian Agriculture and Forestry UniversityFuzhou350002China Key Laboratory of Smart Agriculture and forestry(Fujian Agriculture and forestry University) Fujian Province UniversityFuzhou350002China College of Forestry Fujian Agriculture and Forestry UniversityFuzhou350002China

Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly prominent.In order to promote urban sustainable development and improve the quality of human settlements,it is significant for exploring the evolution characteristics of urban thermal environment and analyzing its driving forces.Taking the Landsat series images as the basic data sources,the winter land surface temperature(LST)of the rapid urbanization area of Fuzhou City in China was quantitatively retrieved from 2001 to 2021.Combing comprehensively the standard deviation ellipse model,profile analysis and GeoDetector model,the spatio-temporal evolution characteristics and influencing factors of the winter urban thermal environment were systematically analyzed.The results showed that the winter LST presented an increasing trend in the study area during 2001–2021,and the winter LST of the central urban regions was significantly higher than the suburbs.There was a strong UHI effect from 2001 to 2021with an expansion trend from the central urban regions to the suburbs and coastal areas in space scale.The LST of green lands and wetlands are significantly lower than croplands,artificial surface and unvegetated lands.Vegetation and water bodies had a significant mitigation effect on UHI,especially in the micro-scale.The winter UHI had been jointly driven by the underlying surface and socio-economic factors in a nonlinear or two-factor interactive enhancement mode,and socio-economic factors had played a leading role.This research could provide data support and decision-making references for rationally planning urban layout and promoting sustainable urban development.

关键词： winter urban heat island(UHI) rapid urbanization area land surface temperature(LST)retrieval profile analysis GeoDetector model Fuzhou City,China

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Sugarcane bagasse amendment improves the quality of green waste vermicompost and the growth of Eisenia fetida

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 65-75页

作者： Linlin Cai Xiangyang Sun Dan Hao Suyan Li Xiaoqiang Gong Hao Ding Kefei Yu College of Forestry Beijing Forestry UniversityBeijing 100083China

Vermicomposting is a feasible method for disposing of lignocellulosic waste while generating a useful product.The current study assessed the potential of vermicomposting green waste mixed with sugarcane bagasse in proportions of 25%,50%,and 75%(v:v,based on dry weight).The suitability was evaluated based on the agrochemical properties,earthworm biomass,and phytotoxicity.The final vermicomposts exhibited near-neutral pH values(7.1-7.6),and lower EC values(0.43-0.72 mS/cm)and C:N ratios(14.1-19.9).The content of available nutrients and CEC for all the vermicomposts exceeded those of the control compost(without earthworms).For vermicomposts,the average values of NO3-N,AP,AK,and CEC were 53,517,1362 mg/kg,and 158 cmol/kg,respectively.The total contents of heavy metals increased in all vermicompost treatments compared to control composts with the following average final percentages:Zn(2.0%),Cr(15.5%),Pb(23.4%),and Cu(44.3%),but these amounts were safe for application in agroforestry.The addition of sugarcane bagasse to green waste significantly increased the content of total humic substance,humic acid and urease activity,acid and alkaline phosphatase activity,and Eisenia fetida reproduction.The addition of 25%sugarcane bagasse to green waste decreased the toxicity to germinating seeds.These results revealed that vermicomposting is a feasible way to degrade green waste into a value-added chemical product.

关键词： Green waste Earthworms Sugarcane bagasse Vermicomposting Nutrient recovery

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