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Journal of Forestry Research 2021年第6期32卷 2323-2331页

作者： Feifan Li Bing Sun Zhaowan Shi Nancai Pei Research Institute of Tropical Forestry Chinese Academy of ForestryGuangzhou510520People’s Republic of China

The stoichiometry of carbon,nitrogen and phosphorous in plants can reflect the interactions between plants and their environment.The interplay between plant nutrients,climatic factors,and soil properties and the underlying regulatory mechanisms are pillars of ecology but remain underexplored.In this study of plant C-N-P stoichiometry and nutrient resorption in Castanopsis hystrix groves in three cities(Guangzhou,Zhongshan,and Lechang)that represent an urban-rural gradient in Guangdong Province,South China,we explored potential relationships among NO_(2) concentrations,diameter at breast height(DBH),and resident human population.Mean annual temperature,mean annual precipitation,insolation duration per year,and the human resident population differed significantly among the three cities.Soil C-N-P was always highest in suburban Lechang,and the concentration of NO_(2) was highest in urban Guanghzou(55.33±0.67μg m^(-3))and positively correlated with the resident population and leaf N:P.Our findings suggest that C-N-P stoichiometry of C.hystrix was better explained by NO_(2)than by soil C-N-P stoichiometry and that nutrient resorption was better explained by leaf nutrients and DBH than by NO_(2) and soil stoichiometry.Our study supports the hypothesis that rapid urbanization influences NO_(2) concentrations and microclimate,which may jointly change the stoichiometry of plant nutrients in the forest ecosystems.

关键词： Ecological stoichiometry Nutrient cycling Plant-environment interaction Subtropical forest Urban–rural gradient

Decomposition dynamics and Ecological stoichiometry of Quercus acutissima and Pinus densiflora litter in the Grain to Green Program Area of northern China

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Journal of Forestry Research 2020年第5期31卷 1613-1623页

作者： Jianni Sun Peng Gao Haidong Xu Cheng Li Xiang Niu Forestry College Mountain Tai Forest Ecosystem Research Station of State Forestry AdministrationShandong Provincial Key Laboratory of Soil Erosion and Ecological RestorationShandong Agricultural UniversityTai’an 271018ShandongPeople’s Republic of China Research Institute of Forest Ecology Environment and ProtectionChinese Academy of ForestryBeijing Collaborative Innovation Center for Eco-Environmental Improvement With Forestry and Fruit TreesBeijing 100091People’s Republic of China

Litter decomposition and Ecological stoichiometry of nutrient release is an important part of material cycling and energy flow in forest ecosystems.In a study of the Ecological stoichiometry and nutrient release during litter decomposition in a pine–oak forest ecosystem of the Grain to Green Program(GTGP)area of northern China,a typical pine and oak species(PDS:Pinus densiflora Sieb.,QAC:Quercus acutissima Carr.)were selected in the Taiyi Mountain study area.The Ecological stoichiometry characteristics of carbon(C),nitrogen(N)and phosphorus(P)and litter decomposition dynamics were studied by field sampling and quantitative analyses.The results showed the following.(1)The decomposition dynamics of both litters was slow-fast-slow.The most important climatic factor affecting the litter decomposition rate from May to October was precipitation and temperature from November to April of the following year.(2)Throughout the 300-day study,in both litters,C of the two litters was released,N first accumulated and was then released,and P exhibited a release-accumulate-release pattern.(3)C:P was significantly higher than C:N and N:P(p<0.05);the C:N of PSD litter was higher than that of QAC(p<0.05),but the N:P of QAC litter was higher than that of PSD litter(p<0.05).The C:N of both litters was very high in the study area,indicating that the nutrient release ability during litter decomposition in the two typical pine–oak forest ecosystems was relatively weak;therefore,more attention should be paid to nitrogen-fixing species and mixed forests in the GTGP area of northern China.

关键词： Decomposition dynamics Ecological stoichiometry Litter Pinus densiflora Quercus acutissima Grain to Green Program(GTGP)

Response of plant,litter,and soil C:N:P stoichiometry to growth stages in Quercus secondary forests on the Loess Plateau,China

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Journal of Forestry Research 2023年第3期34卷 595-607页

作者： Juanjuan Zhang Xinyang Li Meng Chen Linjia Huang Ming Li Xu Zhang Yang Cao College of Forestry Northwest A&F UniversityYangling 712100People’s Republic of China State Key Laboratory of Soil Erosion and Dryland Farming On Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100ShaanxiPeople’s Republic of China

Ecological stoichiometry is an important indicator of biogeochemical cycles and nutrient limitations in terrestrial ecosystems.However,little is known about the response of Ecological stoichiometry to plant growth.In this study,carbon(C),nitrogen(N),and phosphorus(P)concentrations were evaluated in plant tissues(trees,shrubs,and herbs),litter,and soil of young(≤40-year-old),middle-aged(41–60-year-old),near-mature(61–80-year-old),and mature(81–120-year-old)Quercus secondary forests on the Loess Plateau,China.Vegetation composition,plant biomass,and C stock were determined to illustrate their interaction with stoichiometry.Only tree biomass C signifi cantly increased with stand development.Leaf N and trunk P concentrationsgenerally increased,but branch P decreased with growth stage.Fine roots had the highest C and P concentrations at the middle-aged stage.In contrast,shrubs,herbs,litter,and soil C:N:P stoichiometry did not change signifi cantly during stand development.Leaf N and P were positively correlated with soil C,N,P,and their ratios.However,there was no signifi cant correlation between litter and leaves in terms of C:N:P stoichiometry.A redundancy analysis showed that soil N best explained leaf N and P variance,and tree biomass and C stock were related to biotic factors such as tree age and shrub biomass.Hierarchical partitioning analysis indicated that,compared with soil or litter variables,stand age only accounted for a relatively small proportion of leaf C,N,and P variation.Thus,secondary Quercus ecosystems might have inherent ability to maintain sensitive responses of metabolically active organs to environmental factors during stand aging.The results of this work help to elucidate the biogeochemical cycling of secondary forest ecosystems in tree development,provide novel insights into the adaptation strategies of plants in diff erent organs and growth stages,and could be used to guide fertilization programs and optimize forest structure.

关键词： Ecological stoichiometry Tree biomass C stock Understory plant Age Stand development

Litter decomposition and nutrient release for two tropical N-fixing species in Rio de Janeiro,Brazil

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Journal of Forestry Research 2022年第2期33卷 487-496页

作者： David Pessanha Siqueira Giovanna Campos Mamede Weiss de Carvalho JoséGabriel de Souza Silva Marcos Vinicius Winckler Caldeira Deborah Guerra Barroso Laboratório de Fitotecnia Universidade Estadual do Norte Fluminense Darcy RibeiroAvenida Alberto Lamego2000Campos dos GoytacazesRio de JaneiroBrazil Departamento de Ciências Florestais e da Madeira Universidade Federal do Espírito SantoAvenida Governador Lindenberg316Jerônimo MonteiroEspírito SantoBrazil Department of Geosciences and Natural Resources Management University of CopenhagenRolighedsvej 23Frederisksberg CDenmark

Litter production and decomposition are critical to forest productivity,nutrient cycling,and carbon seques-tration in tropical woody ecosystems.However,nutrient release and leaf litter stoichiometry in tropical legume tree plantations over the long term after outplanting are poorly understood or even unknown.Toward improving our under-standing of the pattern of changes in the decomposition of N-fixing leaf litters and their possible impact on carbon stor-age,we measured litter production,mass loss and nutrient release for 240 d during litter decomposition for two tropical legume tree species(Plathymenia reticulata and Hymenaea courbaril),in Rio de Janeiro,Brazil.Litter production for P.reticulata was 5.689 kg ha^(−1) a^(−1) and 3.231 kg ha^(−1) a^(−1) for H.courbaril.The patterns of mass loss rates were similar;however,nutrient release was greater for P.reticulata,while H.courbaril showed immobilization of nutrients,especially for N,which increased by almost 20%in the early phase of decomposition followed by gradual release.Litter from the N-fixing species did differ in nutrient chemistries over time,which was not surprising given that initial nutrient concentrations varied broadly,except for C and P.Most of the nutrient concentrations increased as the remaining litter mass decreased in both species,except for C and K.The C:N and N:P ratios differed between the species,but N:P did not correlate to mass loss.Both species had N-rich leaves,but P.reticulata decomposition was very likely P-limited,while H.courbaril seemed to be co-limited by N and P.The results showed different patterns in nutrient release and the stoichi-ometry involved in the decomposition dynamics of the two tropical N-fixing species,even though they have similar litter decay rates.Both species,but especially P.reticulata,may help re-establish nutrient cycling in disturbed ecosystems.

关键词： Nutrient dynamics Legume species Litter chemistry Ecological stoichiometry Tropical forest

Leaf C:N:P stoichiometric homeostasis of a Robinia pseudoacacia plantation on the Loess Plateau

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Journal of Forestry Research 2023年第4期34卷 929-937页

作者： Zhuoxia Su Bingqian Su Shenglin Mao Zhouping Shangguan State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China

Homeostasis is the adaptability of a species to a changing environment.However,the ecological stoichiometric homeostasis of Robinia pseudoacacia L.in diff erent climatic regions is poorly understood but could provide insights into its adaptability in the loess hilly region.This study sampled 20 year-old R.pseudoacacia plantations at 10 sites along a north–south transect on the Loess Plateau.Variations in the ecological stoichiometric characteristics of leaf and soil carbon,nitrogen,and phosphorus were analysed and homeostatic characteristics of leaf ecological stoichiometric parameters in diff erent climates were identifi ed.Factors aff ecting leaf stoichiometry were assessed.The results show that R.pseudoacacia leaves were rich in nitrogen and defi cient in phosphorous during tree growth and development.Nitrogen and phosphorous levels in the soils of the loess region were lower than the average in soils in the rest of China.All ecological stoichiometric parameters of R.pseudoacacia leaves in two diff erent climates were considered“strictly homeostasis”.Precipitation,available phosphorus,and soil C:P were the main factors aff ecting the variation of C:N:P stoichiometry of R.pseudoacacia leaves.R.pseudoacacia in the loess hilly region has strong ecologically homeostatic characteristics and suggests that it is well-adapted to the area.

关键词： Loess Plateau Robinia pseudoacacia Ecological stoichiometry Homeostasis

Effects of nitrogen addition on plant-soil-microbe stoichio-metry characteristics of different functional group species in Bothriochloa ischemum community

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Soil Ecology Letters 2022年第4期4卷 362-375页

作者： ZiWen Zhao YanLi Qin Yang Wu WenJing Chen Sha Xue GuoBin Liu State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China Key Laboratory of National Forestry and Grassland Administration on ecological Hydrology and Disaster Prevention in Arid Regions Xi'an University of TechnologyXi'an 710048China

Nitrogen(N)deposition,the source of N input into terrestrial ecosystems,is exhibiting an increasingly serious impact on the biogeochemical cycle and functional stability of ecosystems.Grasslands are an important component of terrestrial ecosystems and play a key role in maintaining terrestrial ecosystem balance.Therefore,it is critical to understand the effects of nitrogen addition on grassland ecosystems.We conducted gradientN addition experiments(0,3,6,and 9 g N m^(-2)2 y^(-1))for threeyears ingrassland communities with similar site conditions.We utilized four typical herbaceous plants,including the dominant species Bothriochloa ischemum(B.ischemum)and companion species Stipa bungeana(S.bungeana),Artemisia gmelinii(A.gmelinii),and Cleistogenes squarrosa(C.squarrosa),to explore how different plant-soil-microbe systems respond to N addition.Stoichiometric homeostasis analysis demonstrated that both plants and microbes were strictly homeostatic.However,the companion species were found to be more susceptible to P dominant species.Furthermore,aggravated overlap in stoichiometric niches between plant species were observed at the N6 and N9 levels.Vector analysis indicated that the vector angle was>45°regardlessof plant species and N levels,suggesting that there was a strong Plimitation in the rhizosphere microbial community.Variation partitioning analysis revealed that the Composite roots exhibited a greater effect(explaining 34.7% of the variation)on the rhizosphere microbes than on the Gramineae,indicating that there may be more intense nutrient competition in its rhizosphere.Ingeneral,the effects of N addition on species were different a cross functional groups,with a significant positive effect on the Gramineae(B.ischemum,S.bungeana,and C.squarrosa)and a significant negative effecton the Compositae(A.gmelinii),which should be fully considered in the future ecological management and restoration.

关键词： N addition Ecological stoichiometry Stoichiometric homeostasis Nutrient limitation Stoichiometric niche Plant-soil-microbe system

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ecological Processes 2020年第1期9卷 378-386页

作者： Hu Cui Yang Ou Duian Lv Lixia Wang Aizhen Liang Baixing Yan Yingxin Li Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China Jilin Provincial Engineering Center of CWs Design in Cold Region&Beautiful Country Construction Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China Second Institute of Oceanography Ministry of Natural ResourcesHangzhou 310012China

Ecological stoichiometry is an important indicator presenting multiple elements balance in agro-ecosystems.However,information on microbial communities and nutrient stoichiometry in soil aggregate fractions under different croplands(rice,maize,and soybean fields)remains limited.Thus,this study investigated water-stable aggregate structure and their internal nutrient stoichiometry under different croplands and ascertain their interaction mechanism with microbial communities.The results showed that no significant difference on the carbon-to-nitrogen ratio(C:N)in soil aggregate fractions was observed,while the carbon-to-phosphorus ratio(C:P)and the nitrogen-to-phosphorus ratio(N:P)were ranked as rice field>maize field>soybean field,and were higher in mega-aggregates(ME,>1 mm).General fatty acid methyl ester(FAME),Gram-positive bacteria(G+),and Gramnegative bacteria(G−)were predominant microbial communities in all croplands and tented to condense into coarse-aggregates.Redundancy analysis(RDA)demonstrated that N:P ratio was primary environmental controls on the distribution of soil microorganisms.In the Sanjiang Plain,N was the nutrient element limiting agro-ecosystem productivity,and rice cultivation is expected to improve the N-limited nutrient status.

关键词： Sanjiang Plain Croplands Soil aggregates Microbial communities Ecological stoichiometry

Nitrogen addition mediates the response of foliar stoichiometry to phosphorus addition: a meta-analysis

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ecological Processes 2021年第1期10卷 804-816页

作者： Chengming You Changhui Peng Zhenfeng Xu Yang Liu Li Zhang Rui Yin Lin Liu Han Li Lixia Wang Sining Liu Bo Tan Paul Kardol Forestry ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province and National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and ecological Safety on the Upper Reaches of the Yangtze River and Rainy Area of West China Plantation Ecosystem Permanent Scientifc Research Base Institute of Ecology and ForestrySichuan Agricultural University211 Huimin RoadWenjiang DistrictChengdu 611130SichuanPeople’s Republic of China. Department of Biological Science Institute of Environment SciencesUniversity of Quebec at MontrealCase Postale 8888Succursale Centre-VilleMontrealQC H3C 3P8Canada. Laboratory for ecological Forecasting and Global Change College of ForestryNorthwest A&F UniversityNo.3 Taicheng RoadYangling 712100People’s Republic of China. Department of Community Ecology Helmholtz-Centre for Environmental Research-UFZTheodor-Lieser-Strasse 406110 HalleSaaleGermany. College of Animal Science and Technology Sichuan Agricultural UniversityChengdu 611130People’s Republic of China. Department of Forest Ecology and Management Swedish University of Agricultural Science90183 UmeåSweden.

Background:Changes in foliar nitrogen(N)and phosphorus(P)stoichiometry play important roles in predicting the efects of global change on ecosystem structure and function.However,there is substantial debate on the efects of P addition on foliar N and P stoichiometry,particularly under diferent levels of N addition.Thus,we conducted a global meta-analysis to investigate how N addition alters the efects of P addition on foliar N and P stoichiometry across different rates and durations of P addition and plant growth types based on more than 1150 observations.Results:We found that P addition without N addition increased foliar N concentrations,whereas P addition with N addition had no efect.The positive efects of P addition on foliar P concentrations were greater without N addition than with N addition.Additionally,the efects of P addition on foliar N,P and N:P ratios varied with the rate and duration of P addition.In particular,short-term or low-dose P addition with and without N addition increased foliar N concentration,and the positive efects of short-term or low-dose P addition on foliar P concentrations were greater without N addition than with N addition.The responses of foliar N and P stoichiometry of evergreen plants to P addition were greater without N addition than with N addition.Moreover,regardless of N addition,soil P availability was more efective than P resorption efciency in predicting the changes in foliar N and P stoichiometry in response to P addition.Conclusions:Our results highlight that increasing N deposition might alter the response of foliar N and P stoichiometry to P addition and demonstrate the important efect of the experimental environment on the results.These results advance our understanding of the response of plant nutrient use efciency to P addition with increasing N deposition.

关键词： Ecological stoichiometry Plant nutrient regime Nutrient resorption efciency Soil N and P availability Global change Global synthesis

Impact of vegetation succession on leaf-litter-soil C:N:P stoichiometry and their intrinsic relationship in the Ziwuling Area of China’s Loess Plateau

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Journal of Forestry Research 2021年第2期32卷 697-711页

作者： Zongfei Wang Fenli Zheng State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConservationChinese Acad Sci&Minist Water ResourcesYangling 712100ShaanxiPeople’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Institute of Soil and Water Conservation Northwest A&F UniversityYangling 712100ShaanxiPeople’s Republic of China

Long-term natural vegetation succession plays a substantial role in the accumulation and distribution of plant and soil C:N:P stoichiometry.However,how plant and soil C:N:P relationships or ratios change along with successional stages over a century in the severely eroded areas remain unclear.These were measured over a 100-year natural succession in five successional stages from annual grasses to climax forests.The results show that natural succession had significant effects on carbon(C),nitrogen(N)and phosphorous(P)concentrations in leaf-litter-soil and their ratios in severely eroded areas.Nitrogen concentrations and N:P ratios in leaf and litter increased from annual grasses to the shrub stage and then decreased in the late successional forest stages.Leaf P levels decreased from annual grasses to shrub stages and did not significantly change during late successional stages.Litter P concentration decreased in the early successional stages and increased during late successional stages,with no overall significant change.Soil C and N concentrations and C:N,C:P and N:P ratios increased with successional stages.Soil C and N concentrations decreased with the increasing soil depth.Both were significantly different between any successional stages and controls(cropland)in the upper 10 cm and 10–20 cm soil layers.Leaf N:P ratios may be used to indicate nutrient limitations and this study suggests that plant growth during the grass stages was limited by N,during the shrub stage,by P,and during the forest stages,by both of N and P.In addition,there were close correlations between litter and leaf C:N:P ratios,soil and litter C and N levels,and C:P and N:P ratios.These results show that long-term natural vegetation succession is effective in restoring degraded soil properties and improving soil fertility,and provide insights into C:N:P relationships of leaf,litter and soil influenced by vegetation succession stage.

关键词： Ecological stoichiometry Leaf-litter-soil Loess Platea Natural succession Nutrient elements

Long-term fertilization and residue return affect soil stoichiometry characteristics and labile soil organic matter fractions

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Pedosphere 2020年第5期30卷 703-713页

作者： Shasha LUO Qiang GAO Shaojie WANG Lei TIAN Qi ZHOU Xiujun LI Chunjie TIAN Key Laboratory of Mollisols Agroecology Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102(China) College of Resources and Environment Jilin Agricultural UniversityChangchun 130118(China)

Ecological stoichiometry provides the possibility for linking microbial dynamics with soil carbon(C),nitrogen(N),and phosphorus(P)metabolisms in response to agricultural nutrient management.To determine the roles of fertilization and residue return with respect to Ecological stoichiometry,we collected soil samples from a 30-year field experiment on residue return(maize straw)at rates of 0,2.5,and 5.0 Mg ha^-1 in combination with 8 fertilization treatments:no fertilizer(F0),N fertilizer,P fertilizer,potassium(K)fertilizer,N and P(NP)fertilizers,N and K(NK)fertilizers,P and K(PK)fertilizers,and N,P,and K(NPK)fertilizers.We measured soil organic C(SOC),total N and P,microbial biomass C,N,and P,water-soluble organic C and N,KMnO4-oxidizabIe C(KMnO4-C),and carbon management index(CMI).Compared with the control(F0 treatment without residue return),fertilization and residue return significantly increased the KMn〇4-C content and CMI.Furthermore,compared with the control,residue return significantly increased the SOC content.Moreover,the NPK treatment with residue return at 5.0 Mg ha^-1 significantly enhanced the C:N,C:P,and N:P ratios in the soil,whereas it significantly decreased the C:N and C:P ratios in soil microbial biomass.Therefore,NPK fertilizer application combined with residue return at 5.0 Mg ha^-1 could enhance the SOC content through the stoichiometric plasticity of microorganisms.Residue return and fertilization increased the soil C pools by directly modifying the microbial stoichiometry of the biomass that was C limited.

关键词： balanced fertilization carbon management index Ecological stoichiometry microbial biomass soil organic C