摘要
研究森林植被与土壤碳(C)氮(N)磷(P)化学计量关系是理解生态系统各组分的相互作用和探究植物的生长状况及生态适应性的关键。阿尔泰山天然林是我国北方典型的泰加林,在区域水汽、养分循环和多样性维持等方面发挥了重要作用。以喀纳斯天然林30种乔灌草植物及其生境为对象,运用方差分析、相关分析、冗余分析等方法研究植物叶片及土壤的化学计量特征及其相互关系,揭示喀纳斯天然林乔木、灌木和草本环境适应性的异同。结果显示:30种植物叶片C、N、P的平均含量分别为496.66 g/kg、23.87 g/kg、3.67 g/kg;叶片C∶N、C∶P、N∶P分别为26.52、160.91、6.74。不同生活型植物叶片C、N、P含量及其计量比间显著差异。其中C含量大小顺序为乔木>灌木>草本(P<0.05),N含量大小顺序为草本>灌木>乔木(P<0.05),灌木和草本之间叶片P含量差异不显著(P>0.05),但均显著高于乔木叶片P含量(P<0.05)。叶片C∶N和C∶P大小顺序均为乔木>灌木>草本(P<0.05),乔木和灌木叶片N∶P不存在显著差异(P>0.5),但均显著低于草本N∶P(P<0.05),三者N:P均低于14,普遍受到N元素限制。相关分析表明,乔木和草本叶片C、N含量呈极显著负相关(P<0.01),草本叶片C与P含量之间呈显著负相关(P<0.05),灌木和草本叶片N与P含量间呈极显著正相关(P<0.01)。土壤有机碳(SOC)、土壤全氮(STN)随土层加深而降低(P<0.05),土壤全磷(STP)则不随土层发生明显变化;SOC与STN以及STN与STP间呈极显著正相关(P<0.01),而SOC与STP间相关性不显著(P>0.05)。冗余分析表明,草本叶片C、N、P化学计量更易受到土壤因子影响,乔木叶片次之,灌木叶片则不受土壤因子影响。研究对揭示该区域森林生态系统养分状况特征具有重要意义,并为后续研究该区域森林生态系统养分限制情况提供理论数据。
Study of forest vegetation and soil carbon(C),nitrogen(N),and phosphorus(P)stoichiometry relationships is key to understand the interactions of ecosystem components and explore the growth status and ecological adaptations of plants.We selected 30 major species of trees,shrubs and herbs in Kanas natural forests and their habitats as the research objects.ANOVA,correlation analysis and RDA analysis were used to comprehensively study the stoichiometric characteristics of plant leaves and soil and their interrelationships and to reveal the differences and similarities of environmental adaptation of trees,shrubs and herbs in Kanas natural forests.The results showed that the mean concentration of plants leaf C,N,and P were 469.66 g/kg,23.87 g/kg,and 3.67 g/kg,respectively,in Kanas natural forests.C:N,C:P,and N:P ratios were 26.52,160.91,and 6.74,respectively.There were significant differences in the leaf C,N and P contents and their stoichiometric ratios in different life forms of plants.The order of C content was tree>shrub>herb(P<0.05)and N content was herb>shrub>tree(P<0.05).The difference in leaf P content between shrubs and herbs was insignificant(P>0.05),but both were significantly higher than that of trees(P<0.05).The order of C:N and C:P ratios was tree>shrub>herb(P<0.05).Leaf N:P ratio of trees and shrubs were not significantly different(P>0.5),but both were significantly lower than herb N:P(P<0.05).Correlation analysis showed a highly significantly negative correlation(P<0.01)between C and N contents of the tree and herbaceous leaves,a significantly negative correlation(P<0.05)between C and P contents of herbaceous leaves,and a highly significantly positive correlation between N and P contents of shrub and herbaceous leaves.Soil organic carbon(SOC)and soil total nitrogen(STN)decreased with the increase in soil depth(P<0.05),while soil total phosphorus(STP)did not change significantly(P>0.05).There was a highly significantly positive correlation between SOC and STN,between STN and STP(P<0.01),while the correlat
作者
巴格登
王文栋
许仲林
景云云
白悦莹
李晓雨
Bagedeng;WANG Wendong;XU Zhonglin;JING Yunyun;BAI Yueying;LI Xiaoyu(Colege of Geography and Remote sensing Sciences,Xinjang Unitersity,Urumgi 830046,China;Institute of Forest Ecology,Xinjiang Academy of Forestry,Urumgi 830063,China;College of Eecology and Enironment,Xinjiang Unitersity,Urumgi 830046,China)
出处
《生态学报》
CAS
CSCD
北大核心
2023年第21期8749-8758,共10页
Acta Ecologica Sinica
基金
新疆维吾尔自治区创新环境建设专项科技创新基地建设项目(PT2107)
国家自然科学基金(41761013)。
