南京林业大学学报（自然科学版）2025，Vol.49Issue(5)：45-54,10.DOI:10.12302/j.issn.1000-2006.202307032
典型黑土区水土保持树种生态化学计量特征及其异速关系
Characteristics of ecological stoichiometry of soil and water conservation tree species of typical black soil region and their allometric relationship
摘要
Abstract
[Objective]This study aimed to clarify the nutrient-use characteristics and physiological adaptation strategies of six commonly used soil and water conservation tree species in a typical black soil region.[Method]From the perspective of biomass allocation,six species were selected:Caragana microphylla,Prunus triloba,Betula platyphylla,Acer saccharinum,Picea koraiensis,and Pinus sylvestris var.mongholica,representing three life forms(evergreen arbors,deciduous shrubs,and deciduous trees).Mass fractions of carbon(C),nitrogen(N),and phosphorus(P)were measured in leaves,bark,branches,stems,fine roots,and coarse roots.Stoichiometric ratios(C/N,C/P,N/P)were calculated,and correlation analyses and allometric models were applied to examine relationships among element concentrations and their accumulation rates across organs.[Result]Carbon mass fractions exhibited greater stability than N and P;for deciduous species,belowground carbon stability exceeded that of aboveground parts.Nitrogen stability was consistently higher aboveground than belowground across all life forms,while the coefficient of variation for P was highest in shrub leaves.Total C mass fraction was greater in aboveground than belowground organs,whereas both N and P followed the same allocation strategy,with fine-root concentrations exceeding those in coarse roots.In tree species,C and N concentrations were positively correlated(P＜0.05),while C-P correlations were not significant;in shrub species,C correlated very significantly negatively with N(P＜0.01)and significantly negatively with P(P＜0.05).Significant allometric relationships were found for C-N and C-P across organs,with C accumulation rates generally lower than those of N and P.In contrast,N-P allometries varied by life form:evergreen arbors showed isometric growth between N and P in all organs except bark and fine roots;deciduous shrubs exhibited isometry only in leaves;deciduous trees displayed isometric N-P relationships across all six organs,with N accumulation rates consistently lower than those of P,while in stems and coarse roots of deciduous shrubs and across organs of deciduous trees,N accumulation rates were close to those of P.[Conclusion]Nutrient uptake and utilization across plant organs are coordinated and tightly coupled,but the physiological metabolism of limiting elements N and P differ among seedlings of different life forms.Species-specific traits give rise to distinct nutrient-allocation patterns and stoichiometric characteristics.These findings provide a theoretical basis for the scientific cultivation of soil and water conservation species and the establishment of conservation forests in the typical black soil region of China.关键词
水土保持树种/生态化学计量/养分利用特征/异速生长/黑土区Key words
soil and water conservation tree species/ecological stoichiometry/nutrient utilization characteristics/allometric relationship/black soil region分类
农业科技引用本文复制引用
李婷婷,邹青勤,蒋治岩,王秀伟..典型黑土区水土保持树种生态化学计量特征及其异速关系[J].南京林业大学学报（自然科学版）,2025,49(5):45-54,10.基金项目
国家重点研发计划(2021YFD1500705). （2021YFD1500705）
