生态化学计量特征对松栎混交林生产力的影响  

Effects of Community Stoichiometric Characteristics on the Productivity of A Pine-Oak Mixed Forest in the Qinling Mountains

作　　者：姜路喜 杨安定 岳亚军 侯琳[1,3] 张硕新 JIANG Lu-xi;YANG An-ding;YUE Ya-jun;HOU Lin;ZHANG Shuo-xin(College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China;Matoutan Forestry Bureau of Baoji,Baoji,Shaanxi 721702,China;Qinling National Forest Ecosystem Research Station,Yangling,Shaanxi 712100,China)

机构地区：[1]西北农林科技大学林学院,陕西杨陵712100 [2]陕西省宝鸡市马头滩林业局,陕西宝鸡721702 [3]陕西秦岭森林生态系统国家野外科学观测研究站,陕西杨陵712100

出　　处：《西北林学院学报》2018年第5期31-37,共7页Journal of Northwest Forestry University

基　　金：国家林业公益性行业专项(201304307)

摘　　要：森林群落生产力对森林生态系统功能具有重要影响,化学计量特征反映了植物对营养元素的吸收能力,从而对森林群落生产力产生影响。以秦岭松栎混交林群落为对象,测定优势乔木、灌木和草本叶片及林地(0~10cm)土壤的N与P含量,探讨了松栎混交林群落生态化学计量特征对其群落生产力的影响。结果表明:1)群落的N与P含量间呈现极显著正相关关系(P<0.001);2)群落生产力与生态化学计量特征指标间的关系不显著(P>0.05),群落生产力随着N含量的增加而降低,随着群落P含量增加群落的生产力降低,群落生产力随其N∶P比增大而增大;3)群落生产力与N∶P比值存在显著相关关系(P<0.05);4)研究区优势植物种生长主要受到土壤N元素的限制。The forest community productivity has an important influence on the forest ecosystem function,thus the stoichiometric characteristics reflect plant s ability to absorb nutrients,affect the forest community productivity.We studied the relationship between the community productivity and the ecological stoichiometry of pine-oak mixed forest in Qinling Mountains by determining the contents of N and P in leaves of the dominant arbors,shrubs,herbs and soil(0-10 cm).The results showed that 1)there were positive correlations between the contents of N and P(P<0.001);2)The relationship between community productivity and ecological stoichiometric index was not significant(P>0.05),the community productivity decreased with the increase of N content,as the community P content increased,the productivity of the community decreased,community productivity added with its N∶P ratio increase;3)The relationship between the community productivity and the ratio of N∶P was significant(P<0.05);4)Dominant plant was limited by soil N during the growing processes.

关 键 词：秦岭 松栎混交林 群落生产力 生态化学计量学 

分 类 号：S758.8[农业科学—森林经理学]