辽西两种油松混交林土壤及油松叶片C∶N∶P化学计量特征  

C ∶ N ∶ P stoichiometry of Pinus tabuliformis leaf and soil in two mixed stands in western Liaoning Province

作　　者：张藤子 李亚楠 韩飞燕 张淞著 周永斌[1,2] ZHANG Teng-zi;LI Ya-nan;HAN Fei-yan;ZHANG Song-zhu;ZHOU Yong-bin(College of Forestry,Shenyang Agricultural University,Shenyang 110866,China;Research Station of Liaohe-River Plain Forest Ecosystem,Chinese Forest Ecosystem Research Network,Changtu 112518,Liaoning,China）.)

机构地区：[1]沈阳农业大学林学院,沈阳110866 [2]辽河平原森林生态站,辽宁昌图112518

出　　处：《生态学杂志》2018年第10期3061-3067,共7页Chinese Journal of Ecology

基　　金：国家科技支撑计划项目(2015BAD07B050502)资助

摘　　要：为研究混交林对油松生长养分限制因子的影响,选择油松-蒙古栎和油松-侧柏两种辽西地区典型混交林,以油松纯林为对照,测定油松叶片及土壤C、N、P含量并分析化学计量特征。结果表明:油松-蒙古栎混交林改良土壤能力更强,油松-蒙古栎混交林较纯林可显著提高土壤C、N、P含量,同时降低土壤C∶N和C∶P,提高N和P的有效性;油松-侧柏混交林对土壤化学计量特征的影响与油松-蒙古栎混交林相似,但未达到显著水平;油松纯林叶片N∶P大于16,表明油松生长受到P限制,油松-蒙古栎和油松-侧柏混交林中油松叶片N∶P分别比降到14.88和14.02,混交改善了P对油松生长的限制;混交并未显著改变油松叶片P浓度,但显著降低了叶片N浓度,且叶片C∶N及N∶P与叶片N浓度间显著相关,表明混交林对油松叶片化学计量改变的原因不仅在于混交改变了土壤P供应,而且在于改变了油松对N的利用效率。To evaluate the effects of mixed stands on nutrient limitation for Pinus tabuliformis growth,P. tabuliformis-Quercus mongolica and P. tabuliformis-Platycladus orientalis mixed stands in western Liaoning Province were selected and pure P. tabuliformis stand was taken as control. The concentrations of C,N,and P of P. tabuliformis leaves and soil were measured,and stoichiometric characteristics were analyzed. Results showed that P. tabuliformis-Q. mongolica mixed stand had a better capacity of improving soil fertility. P. tabuliformis-Q. mongolica mixed stand significantly increased soil C,N,and P concentrations,and significantly decreased C ∶ N and C ∶ P ratios of soil,leading to a higher N and P availability. The effects of P. tabuliformisP. orientalis mixed stand on soil C ∶ N ∶ P stoichiometry were similar to that of P. tabuliformis-Q.mongolica mixed stand,but without statistical significance. N ∶ P ratio of P. tabuliformis leaf in the monoculture stands was higher than 16,while that under P. tabuliformis-Q. mongolica mixed stand and P. tabuliformis-P. orientalis mixed stand decreased to 14.88 and 14.02,respectively,indicating that the growth of P. tabuliformis in monoculture was limited by P,which was improved by mixed stands. Foliar P concentration was not altered by both mixed stands; however,N concentration of leaf was decreased. Foliar C ∶ N and C ∶ P ratios were significantly associated with foliar N concentration,indicating that P. tabuliformis changed the stoichiometric characteristics of leaf due to that mixing stand improved soil P supply and N use efficiency.

关 键 词：油松 混交林 纯林 化学计量比 

分 类 号：S714[农业科学—林学] S791.254