华南农业大学学报2026，Vol.47Issue(5)：886-897,12.DOI:10.7671/j.issn.1001-411X.202509018
粤北石灰岩山区不同森林类型土壤以及树种根系、叶片生态化学计量特征
Ecological stoichiometry characteristics of soil,tree roots and leaves in different forest types in a limestone mountain region of northern Guangdong
摘要
Abstract
[Objective]This study aims to reveal the nutrient utilization strategies and calcareous habitat adaptation mechanisms of different forest types in the limestone mountainous ecosystem of northern Guangdong,and to provide a theoretical basis for ecological restoration.[Method]We investigated plantations(Cornus wilsoniana,Chukrasia tabularis,Liquidambar formosana)and natural secondary forests(Zenia insignis,Triadica rotundifolia,Celtis sinensis)in northern Guangdong,where the carbon(C),nitrogen(N),phosphorus(P),potassium(K),calcium(Ca),and magnesium(Mg)contents and ecological stoichiometric characteristics of soil,roots,and leaves were measured and analyzed.[Result]The soil contents of C,N,Ca,and Mg in natural secondary forests(59.02,3.65,7.43,and 4.61 g/kg,respectively)were higher than those in plantations(17.72,1.74,1.95,and 1.95 g/kg,respectively).Both forest types exhibited high Ca levels(soil Ca:1.95 g/kg in plantations and 7.43 g/kg in natural secondary forests;leaf Ca:32.91 g/kg in plantations and 38.60 g/kg in natural secondary forests).In plantations,root P content was significantly positively correlated with leaf N content(P<0.05),root K/P was highly significantly negatively correlated with leaf N/K and Ca/K(P<0.01),root C/P was highly significantly positively correlated with leaf C/N(P<0.01),and soil C/K was significantly negatively correlated with leaf C/N(P<0.05).These correlations indicate that plantations probably experience N limitation and may also face potential P or K limitations.In natural secondary forests,soil P content was significantly positively correlated with leaf P content(P<0.05),soil N content was significantly positively correlated with leaf C/P(P<0.05),and soil Ca content was significantly positively correlated with root N/P and leaf C/K(P<0.05),suggesting that natural secondary forests may be co-limited by P and K.[Conclusion]The nutrient sequestration capacity of natural secondary forests is superior to that of plantations.Plantations require sustained increased inputs of N,while supplementation of P and K should be emphasized in natural secondary forests.关键词
石灰岩山地/生态化学计量学/人工林/天然次生林/钙质土壤适应Key words
Limestone mountainous region/Ecological stoichiometry/Plantation/Natural secondary forest/Calcareous soil adaptation分类
农业科技引用本文复制引用
吴希婷,刘润华,苏立城,涂为熙,吴永彬..粤北石灰岩山区不同森林类型土壤以及树种根系、叶片生态化学计量特征[J].华南农业大学学报,2026,47(5):886-897,12.基金项目
中央财政林业科技推广示范项目(2019GDTK-06) （2019GDTK-06）
中央财政国家公园建设专项资金项目(F25015,F25082) （F25015,F25082）
