摘要
碳(C)、氮(N)、磷(P)生态化学计量比是生态系统过程与功能的重要特征,是当前生态学领域的研究热点之一.依据广西的纬度变化,在桂林(24°15′-26°23′N)、南宁(22°12′-23°32′N)和北海(20°26′-21°55′N)的桉树人工林建立24块固定样地,分析桉树叶片、地被物凋落叶及土壤的C、N、P含量及其化学计量特征的纬度变化格局.结果表明:(1)3个地区C、N平均含量均表现为叶片>凋落叶>土壤,P平均含量则表现为叶片>土壤>凋落叶.凋落叶P平均含量呈现出随纬度上升显著增加的趋势(P<0.05),而土壤和叶片养分含量与纬度间均不显著.(2)3个地区的C:N、C:P、N:P均表现为凋落叶>叶片>土壤.凋落叶C:P、N:P以及土壤C:N、C:P、N:P呈现出随纬度的上升均显著下降的趋势(P<0.05).(3)叶片与土壤C含量呈现显著正相关(P<0.05),而叶片N、P含量分别与土壤N、P含量无显著相关性,表明土壤N、P对叶片N、P含量的影响不大.凋落叶C:P与土壤C:P显著正相关(P<0.05),表明凋落叶与土壤C、P存在着一定的联系.本研究揭示了广西桉树人工林中叶片、凋落叶和土壤间C、N、P生态化学计量特征及其随纬度变化的趋势,推断广西桉树人工林凋落叶的分解主要受P限制,同时P元素可能是限制北海桉树生长的限制因子;研究成果可为桉树人工林的经营和管理提供科学依据.
The ecological stoichiometric ratios of carbon(C),nitrogen(N),and phosphorus(P)are important features of ecosystem processes and functions,and their research is currently one of the research hotspots in ecology.In this study,24 permanent plots were established in Eucalyptus plantations in Guilin(24°15′-26°23′N),Nanning(22°12′-23°32′N),and Beihai(20°26′-21°55′N),and the latitudinal change patterns of C,N,and P contents and their stoichiometry characteristics of Eucalyptus leaf,forest floor leaf litter,and soil were analyzed.The results showed that:(1)The order of average content of C and N in the three regions was leaf>leaf litter>soil,and the order of average P content was leaf>soil>leaf litter.The average P content of leaf litter showed a significant increase with latitude(P<0.05),while the soil and leaf nutrient content and latitude were not significant.(2)The order of C:N,C:P,and N:P ratios in the three regions was litter>leaf>soil.Leaf C:P and N:P ratios,and soil C:N,C:P,and N:P ratios decreased significantly with increasing latitude(P<0.05).(3)There was a significant positive correlation between leaf and soil C content(P<0.05),but there was no significant correlation between leaf N and P content and soil N and P content,which indicated that soil N and P had little effect on leaf N and P content.The C:P ratio of leaf litter was significantly positively correlated with the soil C:P ratio(P<0.05),indicating that there was a certain relationship between leaf litter and soil C and P content.This study revealed the ecological stoichiometric characteristics of C,N,and P among leaf,leaf litter,and soil in Eucalyptus plantations in Guangxi and their trends with latitude.The results of this study indicate that the decomposition of C,N,and P in such plantations was mainly limited by P,and that P might be a limiting factor for the growth of Eucalyptus in the Beihai region.The results of this study can provide a scientific basis for the management of Eucalyptus plantations.
作者
彭杏冰
胡刚
胡聪
陆绍暖
黄侩侩
庞庆玲
张忠华
PENG Xingbing;HU Gang;HU Cong;LU Shaonuan;HUANG Kuaikuai;PANGQingling;ZHANG Zhonghua(Key Laboratory of Beibu Gulf Environment Change and Resources Utilization of Ministry of Education,Nanning Normal University,Nanning 530001,China;Collaborative Innovation Center of the Ecological Environment and Integration Development in the Xijiang River Basin,Nanning Normal University,Nanning 530001,China;School of Geography and Planning,Nanning Normal University,Nanning 530001,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第5期1194-1202,共9页
Chinese Journal of Applied and Environmental Biology
基金
广西科技重大专项(AA17204087-9)
国家自然科学基金项目(31760128,31960275)
广西自然科学基金项目(2017GXNSFDA198003)资助。
关键词
纬度格局
桉树人工林
土壤养分
生态化学计量学
latitudinal pattern
Eucalyptus plantation
soil nutrient
ecological stoichiometry
