伏牛山南麓山茱萸人工林土壤碳氮磷及化学计量特征  

Soil carbon,nitrogen,and phosphorus characteristics and stoichiometry of Cornus officinalis plantation at the southern foot of the Funiu Mountain

作　　者：崔志鹏 王菁华 陈玉婷 阚德龙 任学敏 CUI Zhipeng;WANG Jinghua;CHEN Yuting;KAN Delong;REN Xuemin(College of Agricultural Engineering,Nanyang Normal University,Nanyang 473061,China;Key Laboratory of Ecological Security for Water Source Region of Mid-line Project of South-to-North Diversion Project of Henan Province,Nanyang Normal University,Nanyang 473061,China;Henan Collaborative Innovation Center of Water Security for Water Source Region of Mid-line Project of South to North Diversion Project,Nanyang 473061,China)

机构地区：[1]南阳师范学院农业工程学院,南阳473061 [2]河南省南水北调中线水源区生态安全重点实验室,南阳473061 [3]南水北调中线水源区水安全河南省协同创新中心,南阳473061

出　　处：《应用与环境生物学报》2021年第4期908-915,共8页Chinese Journal of Applied and Environmental Biology

基　　金：国家自然科学基金项目(31401307);河南省教育厅科学技术研究重点项目(14A210014)资助。

摘　　要：分析人工林土壤碳(C)、氮(N)、磷(P)及其化学计量特征,对于了解森林土壤养分丰缺和养分平衡从而制定科学合理的经营管理策略具有重要意义.以伏牛山南麓西峡县2个林龄(26年和38年)各自4种林分密度(725、900、1031、1250株/hm^(2))的山茱萸(Cornus officinalis)人工林为研究对象,测定0-30 cm土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量,计算C:N、C:P和N:P,分析林龄、林分密度对土壤SOC、TN、TP含量及其化学计量特征的影响,探索土壤SOC、TN、TP含量及其化学计量比相互间的关系.结果表明,山茱萸人工林整体土壤SOC和TN含量丰富,TP含量匮乏;C:P和N:P较高,元素比例严重失衡,P有效性低.林龄38年的土壤SOC、TN、TP含量及C:N、C:P、N:P均高于林龄26年,除C:N外,其他差异均达显著水平(P<0.05).林分密度对山茱萸人工林土壤SOC、TN、TP含量及其计量比均存在极显著(P<0.001)影响,林龄26年和38年的土壤C:P和N:P均以密度1031株/hm^(2)的最高,表明该密度下土壤的C、P和N、P比例失衡严重.山茱萸人工林整体土壤TN与TP、C:N与C:P的最优关系可用二次函数表示,前者达极显著水平(P<0.01),后者不显著(P>0.05),其他土壤C、N、P及计量比相互间呈显著或极显著线性关系;从关系强度来看,C:N和N:P主要受TN含量影响,C:P主要受TP含量影响.由此可见,在山茱萸人工林经营管理中,针对土壤P元素的不足应适量补充施加,调节各元素之间的计量比,进一步促进群落发展.Analysis of soil C,N,P,and their stoichiometric characteristics in plantations have great significance for understanding the nutrient abundance,deficiency,and balance of forest soils in order to formulate scientific and rational management strategies.Cornus officinalis plantations with four stand densities(725,900,1031,and 1250 plants/hm^(2))of two forest ages(26 and 38 years)in Xixia County,the southern foot of the Funiu Mountain were selected as the research sites;the levels of soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP)in the 0–30 cm soil layer were determined,and C:N,C:P,and N:P were calculated.The effects of forest age and stand density on soil SOC,TN,and TP levels and their stoichiometric characteristics were analyzed,and the relationships among soil SOC,TN,and TP levels and C:N,C:P,and N:P were explored.The results showed an overall abundance of soil SOC and TN levels in the C.officinalis plantation,whereas the TP content was scarce,and the C:P and N:P ratios were high,indicating a severe imbalance in the element ratio and low availability of P.The soil SOC,TN,and TP,and C:N,C:P,and N:P of the 38-year-old forest were higher than those of the 26-year-old forest;the differences were significant(P<0.05)except for C:N.The stand density had an extremely significant(P<0.001)effect on the soil SOC,TN,and TP levels,and their stoichiometric ratios.The ratios of C:P and N:P were the highest in the C.officinalis plantation with a density of 1031 plants/hm^(2) in both forest ages,which revealed that a serious imbalance existed in the ratio of soil C,P,and N,P at this density.The optimal relationships between TN and TP and C:N and C:P in the entire soil of the C.officinalis plantation could be expressed through quadratic functions,and although the former was extremely significant(P<0.01),the latter was not(P>0.05).The soil C,N,and P,and their stoichiometric ratios showed significant or extremely significant linear relationships with each other.According to the strength of the relationship,C:N

关 键 词：山茱萸 土壤养分 土壤化学计量学 林龄 林分密度 

分 类 号：S714[农业科学—林学]