森林工程2025，Vol.41Issue(6)：1230-1241,12.DOI:10.7525/j.issn.1006-8023.2025.06.013
杉木纯林转变为杉木和闽楠复层异龄混交林对土壤剖面氮磷组分的影响
Effects of Transforming Pure Cunninghamia lanceolata Plantations into Multi-layered,Uneven-aged Mixed Cunninghamia lanceolata and Phoebe bournei Plantations on Soil Profile Nitrogen and Phosphorus Fractions
摘要
Abstract
Soil nitrogen(N)and phosphorus(P)are critical for tree growth.Investigating the variation characteristics of N and P fractions across soil profiles and their primary influencing factors following the transformation from pure planta-tions to multi-layered,uneven-aged plantations provides insights into the mechanisms by which structural regulation of pure forest stands impacts soil quality.This study focused on pure Cunninghamia lanceolata plantations and multi-lay-ered uneven-aged mixed C.lanceolata and Phoebe bournei plantations(hereafter referred to as mixed C.lanceolata and P.bournei plantations).We examined the variations in N and P fractions,other soil properties,and root traits across dif-ferent soil layers(0-10 cm,>10-30 cm,>30-50 cm)in these two stands,as well as their interrelationships.The re-sults revealed that after the transition from pure C.lanceolata plantations to mixed C.lanceolata and P.bournei planta-tions,the contents of most N and P fractions in the 0-10 cm soil layer significantly increased.Specifically,labile,mod-erately labile,and stable P fractions,along with total P contents,increased by 38.2%,31.6%,15.4%,and 25.1%,respectively,compared to the pure C.lanceolata plantations,and inorganic,organic,and total N contents increased by 42.1%,35.8%,and 35.9%,respectively.In the>10-30 cm soil layer,the contents of moderately labile organic P,in-organic N,acid-hydrolysable organic N,total N,and total P were significantly higher in the mixed C.lanceolata and P.bournei plantations than pure C.lanceolata plantations.However,no significant differences in N and P fractions con-tents were observed between the two stands in the>30-50 cm soil layer.The contents of N and P fractions of the two stands decreased with increasing soil depth.Furthermore,the transformation of stand structure affects root distribution and traits.The mixed C.lanceolata and P.bournei plantations exhibited higher root biomass,root length density,and specific root length compared to pure C.lanceolata plantations.The root biomass and root length density at 0-10 cm in-creased by 124.66%and 269.23%,respectively,compared to the pure C.lanceolata plantations.In pure C.lanceo-lata plantations,root biomass and root length density initially increased and then decreased with soil depth.In contrast,due to the surface aggregation of P.bournei roots in the mixed C.lanceolata and P.bournei plantation,the root biomass and root length density of C.lanceolata gradually increased with soil depth.The variations in soil nitrogen and phospho-rus components across different stand types and soil depths were primarily associated with root distribution,soil organic carbon,and soil microbial characteristics.The findings highlight that structural optimization of C.lanceolata plantations in subtropical regions significantly influences soil fertility.关键词
氮磷组分/混交林/根系分布/杉木/闽楠Key words
Nitrogen and phosphorus fractions/mixed forest/root distribution/Cunninghamia lanceolata/Phoebe bournei分类
农业科技引用本文复制引用
杨颖,王国忠,郑文华,谷加存,成向荣..杉木纯林转变为杉木和闽楠复层异龄混交林对土壤剖面氮磷组分的影响[J].森林工程,2025,41(6):1230-1241,12.基金项目
国家自然科学基金项目(32271855) （32271855）
浙江省中国林科院合作重大项目(2025SY05). （2025SY05）
