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N-fixing tree species promote the chemical stability of soil organic carbon in subtropical plantations through increasing the relative contribution of plant-derived lipids

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Forest Ecosystems 2024年第5期11卷 758-769页

作者： Xiaodan Ye Junwei Luan Hui Wang Yu Zhang Yi Wang Shirong Liu College of Coastal Agricultural Sciences Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing 100091China Institute of Resources and Environment International Centre for Bamboo and RattanKey Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and TechnologyBeijing 100102China

Biodiversity experiments have shown that soil organic carbon(SOC)is not only a function of plant diversity,but is also closely related to the nitrogen(N)-fixing ***,the effect of N-fixing trees on SOC chemical stability is still little known,especially with the compounding effects of tree species *** experimental field manipulation was established in subtropical plantations of southern China to explore the impacts of tree species richness(i.e.,one,two,four and six tree species)and with/without N-fixing trees on SOC chemical stability,as indicated by the ratio of easily oxidized organic carbon to SOC(EOC/SOC).Plant-derived C components in terms of hydrolysable plant lipids and lignin phenols were isolated from soils for evaluating their relative contributions to SOC chemical *** results showed that N-fixing tree species rather than tree species richness had a significant effect on EOC/*** plant lipids and lignin phenols were negatively correlated with EOC/SOC,while hydrolysable plant lipids contributed more to EOC/SOC than lignin phenols,especially in the occurrence of N-fixing *** presence of N-fixing tree species led to an increase in soil N availability and a decrease in fungal abundance,promoting the selective retention of certain key components of hydrolysable plant lipids,thus enhancing SOC chemical *** findings underpin the crucial role of N-fixing trees in shaping SOC chemical stability,and therefore,preferential selection of N-fixing tree species in mixed plantations is an appropriate silvicultural strategy to improve SOC chemical stability in subtropical plantations.

关键词： Tree species diversity Soil organic carbon N-fixing tree species Hydrolysable plant lipids Lignin phenols

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Fabricating Cationic Lignin Hydrogels for Dye Adsorption

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Journal of Renewable Materials 2023年第4期11卷 1793-1805页

作者： Chao Wang Xuezhen Feng Wanbing Li Shibin Shang Haibo Zhang Institute of Chemical Industry of Forest Products CAF、National Engineering Laboratory for Biomass Chemical Utilization、Key Laboratory of Chemical Engineering of Forest ProductsNational Forestry and Grassland Administration、Key Laboratory of Biomass Energy and MaterialJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing210042China

Due to the low content of adsorption-active groups in lignin,its application in the field of adsorption is ***,we first prepared cationic kraft lignin acrylate,from which a cationic lignin(CKLA)hydrogel was further prepared by cationic kraft lignin acrylate,acrylamide,and N,N’-*** morphology,compression properties and swelling properties of CKLA hydrogels were *** prepared CKLA hydrogel was applied as an adsorbent for Congo *** effect of CKLA hydrogel dosages,initial concentration of Congo red,and pH on adsorption efficiency was *** maximum Congo red removal efficiency was obtained at the initial concentration of Congo red of 50 mg/L,pH 7,and 5 mg dosage of CKLA hydrogel with 20%cationic lignin *** five cycles of adsorption,the adsorption efficiency of the hydrogel for Congo red still reached more than 80%.The CKLA hydrogel showed pseudo-second-order adsorption kinetics for Congo red *** results demonstrate the potential of the CKLA hydrogel as an adsorbent for water treatment.

关键词： Adsorption lignin congo red hydrogel

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Heartwood variations in mid-aged plantations of Erythrophleum fordii

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Journal of Forestry research 2021年第6期32卷 2375-2383页

作者： Zhigang Zhao Wei Shen Chunsheng Wang Hongyan Jia Jie Zeng research Institute of Tropical Forestry Chinese Academy of ForestryLongdongGuangzhou 510520People’s Republic of China Zhaoqing University Zhaoqing City 526061People’s Republic of China Experimental Centre of Tropical Forestry Chinese Academy of ForestryPingxiang City 532600People’s Republic of China

Erythrophleum fordii Oliv.(Caesalpiniaceae)is a rosewood species naturally distributed in southeast Asia and south China,and the heartwood is commonly used for high-quality crafts and *** there are differences in heartwood development among single trees with distinct social status,the relationship between heartwood development and growth performance remains *** information is essential to improve plantation management for high-yield heartwood *** dominant,intermediate and suppressed trees were sampled from *** plantations aged in 32-35 years in Pingxiang City,Guangxi,*** analysis was carried out to determine horizontal and vertical variations of heartwood and *** of annual rings,diameter and area of heartwood and sapwood as well as ratios of heartwood diameter and area at breast height were all significantly influenced by the social status of trees in stands(P<0.05).In these mid-aged plantations,*** stems developed heartwood once the xylem diameter reached 5-10 cm,and then heartwood diameter and area increased with increasing xylem *** ring numbers,diameter and area as well as their ratios decreased with increasing height,while sapwood ring numbers and diameter were relatively constant within the section where heartwood *** and sapwood diameters were equal at heights of approximately 6-m for dominant,5-m for intermediate and 3-m for suppressed *** trees differed considerably from intermediate and suppressed trees in heartwood volume,while heartwood volume ratios were all below 30%,and near 90%in the stem section below 8-m height regardless of social *** analysis showed that DBH was the most important factor influencing heartwood in even-aged *** findings provide evidence for crop tree selection,thinning regimes and reasonable management of plantations of ***.

关键词： Erythrophleum fordii Heartwood formation Spatial variation Tree differentiation

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Impacts of climate change on the potential forest productivity based on a climate-driven biophysical model in northeastern China

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Journal of Forestry research 2020年第6期31卷 2273-2286页

作者： Wen-Qiang Gao Xiang-Dong Lei Li-Yong Fu Institute of Forest Resource Information Techniques Chinese Academy of ForestryKey Laboratory of Forest Management and Growth ModellingState Forestry and Grassland AdministrationBeijing 100091People’s Republic of China

Climate warming is expected to influence forest growth,composition and ***,accurately estimating and predicting forest biomass,potential productivity or forest growth is still a challenge for forest managers dealing with land-use at the stand to regional *** the present study,we predicted the potential productivity(PP)of forest under current and future climate scenarios(RCP2.6,RCP4.5,RCP6.0 and RCP8.5)in Jilin province,northeastern China by using Paterson’s Climate Vegetation and Productivity(CVP)index *** PP was validated by comparing it with the mean and maximum net primary production calculated from light energy utilization(GLM_PEM).Our results indicated that using the CVP index model is partially valid for predicting the potential forest productivity in northeastern *** exhibited obvious spatial heterogeneity varying from 4.6 to 8.9 m3 ha-1 year-1 with an increasing tendency from northwest to southeast driven by the precipitation across the *** number of vegetation-active months,precipitation and insolation coefficient were identified as the primary factors affecting PP,but no significant relationship was found for warmest temperature or temperature *** future climate scenarios,PP across the Jilin Province is expected to increase from 1.38%(RCP2.6 in 2050)to 15.30%(RCP8.5 in 2070),especially in the eastern Songnen Plain(SE)for the RCP8.5 scenarios.

关键词： Climate vegetation and productivity index Potential productivity Climate change

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Evaluating soil nutrients of Dacrydium pectinatum in China using machine learning techniques

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Forest Ecosystems 2020年第3期7卷 378-391页

作者： Chunyan Wu Yongfu Chen Xiaojiang Hong Zelin Liu Changhui Peng State Key Laboratory of Tree Genetics and Breeding Key Laboratory of Tree Breeding and Cultivation of the State Forestry AdministrationResearch Institute of ForestryChinese Academy of ForestryBeijing100091China research Institute of Forest Resource Information Techniques Chinese Academy of ForestryBeijing100091China Hainan Bawangling National Natural Reserve Changjiang572722HainanChina Department of Biological Science Institute of Environment SciencesUniversity of Quebec at MontrealMontrealQCCanada

Background: The accurate estimation of soil nutrient content is particularly important in view of its impact on plant growth and forest regeneration. In order to investigate soil nutrient content and quality for the natural regeneration of Dacrydium pectinatum communities in China, designing advanced and accurate estimation methods is ***: This study uses machine learning techniques created a series of comprehensive and novel models from which to evaluate soil nutrient content. Soil nutrient evaluation methods were built by using six support vector machines and four artificial neural ***: The generalized regression neural network model was the best artificial neural network evaluation model with the smallest root mean square error(5.1), mean error(-0.85), and mean square prediction error(29). The accuracy rate of the combined k-nearest neighbors(k-NN) local support vector machines model(i.e. k-nearest neighbors-support vector machine(KNNSVM)) for soil nutrient evaluation was high, comparing to the other five partial support vector machines models investigated. The area under curve value of generalized regression neural network(0.6572) was the highest, and the cross-validation result showed that the generalized regression neural network reached 92.5%.Conclusions: Both the KNNSVM and generalized regression neural network models can be effectively used to evaluate soil nutrient content and quality grades in conjunction with appropriate model variables. Developing a new feasible evaluation method to assess soil nutrient quality for Dacrydium pectinatum, results from this study can be used as a reference for the adaptive management of rare and endangered tree species. This study, however, found some uncertainties in data acquisition and model simulations, which will be investigated in upcoming studies.

关键词： Support vector machine KNNSVM Generalized regression neural network Nutrient grade Rare and endangered tree species

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Isolation,expression and single nucleotide polymorphisms(SNPs) analysis of LACCASE gene(LkLAC8) from Japanese larch(Larix kaempferi)

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Journal of Forestry research 2017年第5期28卷 891-902页

作者： Changyong Liu Yunhui Xie Min Yi Shougong Zhang Xiaomei Sun State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of Forestry research Institute of Forestry Chinese Academy of Forestry State Academy of Forestry Administration School of Gardening and Landscape Design Jiangxi Agricultural University

Nucleotide diversity (pi) and linkage disequilibrium (LD) analysis based on SNP marker could provide a sound basis for choosing an association analysis method. Japanese larch (Larix kaempferi) is an important timber coniferous tree species for pulping and papermaking, but its high lignin content has significantly restricted it application potential. In this study, the LACCASE gene, that plays an important regulatory role for lignin biosynthesis, was selected as research target. The full-length cDNA and genomic sequences of the encoding LkLAC8 gene were isolated from the LACCASE expressed sequence tags of the Japanese larch transcriptome database using the rapid amplification of cDNA ends-polymerase chain reaction (RACE-PCR). The cDNA was determined to be 1940 bp, with an open reading frame (ORF, 1734 bp) that encoded a protein of 577 AA. This protein contains four highly specific Cu2+ binding sites and 11 glycosylation sites, thus belonging to the LACCASE family. The deduced protein sequence shared an 89% identity with the PtaLAC from Pinus taeda. A real-time PCR analysis showed that the LkLAC8 transcript was expressed predominantly in mature xylem, with moderate levels in the immature xylem, cambium and mature leaves, the lowest in the roots. Lastly, the genomic sequences of LkLAC8 in 40 individuals from six naturally distributed populations of Japanese larch were amplified, and a total of 201 SNPs (103 and 98 mutation types of transition and transversion, respectively) were detected; the frequency of the SNPs was 1/19 bp. Nucleotide diversity among the six populations ranged from 0.0034 to 0.0053, which suggested that there were no significant differences among the populations. The LD analysis showed that the LD level decayed rapidly within the increasing length of the LkLAC8 gene. These results implied that LD mapping and association analysis based on candidate gene may be feasible for the marker-assisted breeding of new germplasms with low lignin in Japanese lar

关键词： Gene cloning LACCASE Larix kaempferi Linkage disequilibrium Real-time PCR Single nucleotide polymorphisms

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The role of senescence-associated gene101 (PagSAG101a) in the regulation of secondary xylem formation in poplar

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Journal of Integrative Plant Biology 2022年第1期64卷 73-86页

作者： Hui He Xue-Qin Song Cheng Jiang Ying-Li Liu Dian Wang Shuang-Shuang Wen Guo-Hua Chai Shu-Tang Zhao Meng-Zhu Lu State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091China State Key Laboratory of Subtropical Silviculture College of Forestry and BiotechnologyZhejiang A&F UniversityHangzhou 311300China College of Agronomy Qingdao Agricultural UniversityQingdao 266109China College of Resources and Environment Qingdao Agricultural UniversityQingdao 266109China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjing 210037China

Wood is produced by the accumulation of secondary xylem via proliferation and differentiation of the cambium cells in woody plants. Identifying the regulators involved in this process remains a challenging task. In this study, we isolated Pag SAG101 a,the homolog of Arabidopsis thaliana SAG101, from a hybrid poplar(Populus alba × Populus glandulosa)clone 84 K and investigated its role in secondary xylem development. Pag SAG101 a was expressed predominantly in lignified stems and localized in thenucleus. Compared with non-transgenic 84 K plants,transgenic plants overexpressing Pag SAG101 a displayed increased plant height, internode number,stem diameter, xylem width, and secondary cell wall thickness, while opposite phenotypes were observed for Pag SAG101 a knock-out *** analyses revealed that differentially expressed genes were enriched for those controlling cambium cell division activity and subsequent secondary cell wall deposition during xylem *** addition, the tandem CCCH zinc finger protein Pag C3 H17, which positively regulates secondary xylem width and secondary wall thickening in poplar, could bind to the promoter of Pag SAG101 a and mediate the regulation of xylem *** results support that Pag SAG101 a, downstream of Pag C3 H17, functions in wood development.

关键词： cambium PagSAG101a Populus secondary cell wall xylem formation

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The phytochemical components of walnuts and their application for geographical origin based on chemical markers

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Food Quality and Safety 2022年第4期6卷 562-570页

作者： Runhong Mo Yuewen Zheng Zhanglin Ni Danyu Shen Yihua Liu research Institute of Subtropical Forestry Chinese Academy of ForestryFuyang DistrictHangzhouChina

Place of origin has an important influence on walnut quality and commercial value,which results in the requirement of rapid geographical traceability ***,a method for geographical origin identification of walnuts on the basis of nutritional quality of walnuts from China was *** concentrations of 43 phytochemical components were analyzed in walnut samples from five different walnut-producing regions of *** on 14 chemical markers selected by the Random Forest method from these phytochemical components,a new discriminant model for geographical origin was built,with the corresponding correct classification rate of 99.3%.In addition,the quantitative quality differences of walnuts from five regions were analyzed,with values of 0.17–***,the top three chemical markers for the geographical origin discriminant analysis were Mo,V,and stearic acid,with contribution rates of 26.8%,18.9%,and 10.9%,*** study provides a potentially viable method for application in food authentication.

关键词： Walnut chemical marker geographical origin Random Forest method discriminant model

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Energy partitioning and evapotranspiration in a black locust plantation on the Yellow River Delta,China

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Journal of Forestry research 2022年第4期33卷 1219-1232页

作者： Xiang Gao Zhenyu Du Qingshan Yang Jinsong Zhang Yongtao Li Xiaojie Wang Fengxue Gu Weiping Hao Zekun Yang Dexi Liu Jianmin Chu Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration Research Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China research Center for Coastal Forestry of National Forestry and Grassland Administration Beijing 100091People’s Republic of China Shandong Academy of Forestry Sciences Ji’nan 250014People’s Republic of China Forest Ecosystem research Station of the Yellow River Delta in Shandong Dongying 257000People’s Republic of China Yellow River Delta Ecological research Station of Coastal Wetland Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003People’s Republic of China Key Laboratory of Dryland Agriculture of Ministry of Agriculture and Rural Aff airs Institute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural SciencesBeijing 100081People’s Republic of China

Plantations of woody tree species play a crucial role in ecological security along coastal *** energy partitioning and evapotranspiration can reveal land–atmosphere interaction *** investigated energy fluxes,evapotranspiration,and their related biophysical factors using eddy covariance techniques in a black locust(Robinia pseudoacacia L.)plantation in 2016,2018,and 2019 on the Yellow River *** longwave radiation offsets 84–85%of upward longwave radiation;upward shortwave radiation accounted for 12–13%of downward shortwave *** ratio of net radiation to downward radiation was 18–19%over the three *** the growing season,latent heat flux was the largest component of net radiation;during the dormant season,the sensible heat flux was the dominant component of net *** seasonal variation in daily evapotranspiration was mainly controlled by net radiation,air temperature,vapor pressure deficit,and leaf area *** locust phenology influenced daily evapotranspiration variations,and evapotranspiration was greater under sea winds than under land winds because soil water content at 10-cm depth was greater under sea winds during the *** patterns of daily evaporative fraction,Bowen ratio,crop coefficient,Priestley–Taylor coefficient,surface conductance,and decoupling coefficient were mainly controlled by leaf area *** threshold value of daily surface conductance was approximately 8 mm sover the plantation.

关键词： Black locust plantation Yellow River Delta Eddy covariance Energy partitioning Evapotranspiration

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Comparative transcriptome analyses reveal candidate genes regulating wood quality in Japanese larch(Larix kaempferi)

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Journal of Forestry research 2020年第1期31卷 65-73页

作者： Shae He Yunhui Xie Xiaomei Sun Shougong Zhang Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration,research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,People’s Republic of China State Key Laboratory of Tree Genetics and Breeding Chinese Academy of ForestryBeijing 100091People’s Republic of China Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration Research Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China

We studied the molecular mechanism of the quality traits of wood formation in *** used the immature latewood cells of two Japanese larch(Larix kaempferi)clones with significant differences in density and in microfibrillar angle(MFA)as materials to analyze their gene expression profiles.A total of 1735 differentially expressed genes were detected in immature latewood cells of the two clones,among which,971 were up-regulated and 764 were *** gene expression profiling analysis revealed that genes encoding transcription factor members NAC66 and R2R3-MYB4,microtubule-associated protein,actin-related protein,cell wall protein members,arabinogalactan protein,Fasciclin-like arabinogalactan protein and glycine-rich protein,and several cell-wall-synthesis genes affected wood density and MFA by regulating latewood formation at transcriptional *** study results represent a basis for selection of quality traits and genetic improvement of larch wood.

关键词： Japanese larch Wood formation Transcription regulation Wood property Digital gene expression profiling

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