立地条件和林龄对四川马尾松林C、N、P化学计量特征的影响  

Effects of Site Condition and Stand Age on C,N,P Stoichiometric Characteristics of Pinus massoniana Forest in Sichuan

作　　者：宋思梦 周扬 张健[2,3] SONG Si-meng;ZHOU Yang;ZHANG Jian(Agricultural College,Sichuan Minzu College,Research Center for Ecological Restoration and Characteristic Industry Cultivation in Hengduan Mountains Region,Kangding 626001,China;Institute of Ecology&Forestry,Sichuan Agriculture University,Monitoring Station for Eco-environments in the Rainy Zone of Southwest China,Chengdu 611130,China;Key laboratory of Ecological Forestry Engineering of Sichuan Province,Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River,Chengdu 611130,China)

机构地区：[1]四川民族学院农学院,横断山区生态修复与特色产业培育研究中心,四川康定626001 [2]四川农业大学生态林业研究所,华西雨屏区生态环境监测站,四川成都611130 [3]四川省林业生态工程重点实验室,长江上游生态安全协同创新中心,四川成都611130

出　　处：《长江流域资源与环境》2021年第9期2138-2153,共16页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金项目(31370628);国家科技支撑计划项目(2011BAC09B05);四川省科技支撑计划项目(12ZC0017);四川省科技厅应用基础项目(2012JY0047);四川省教育厅科技创新团队计划项目(11TD006);四川民族学院自办科研项目(XYZB2016ZB,XYZB2003ZA)。

摘　　要：为揭示立地类型和林龄对四川省马尾松林生态化学计量特征的影响,以丘陵、山地2个立地类型小区的4个立地类型组、6个立地类型亚组和15个立地类型中不同林龄马尾松人工林为研究对象,分析了各立地类型与林龄内马尾松针叶C、N、P含量及计量比。结果表明:四川省马尾松针叶平均C、N和P含量分别为524.34±29.09、10.28±0.51和0.99±0.18 g/kg,C∶N、C∶P和N∶P分别为51.08±3.68、543.90±97.40和10.73±2.24,且其均受立地类型与林龄的显著影响(P<0.05)。同一林龄中,针叶C∶N、C∶P和N∶P在丘陵高于山地;C含量、C∶N和C∶P均在砂质黄壤、丘陵坡下部、山地600~1000海拔15°~35°的阳坡中较高。四川省马尾松人工林适宜的立地类型为丘陵砂质黄壤坡下部及山地砂质黄壤600~1000 m海拔15°~35°的阳坡,其针叶C储存能力和N、P养分利用效率较高。同一立地类型内,与针叶N、P含量变化趋势相反,马尾松针叶C含量与计量比自幼龄林至近熟林期逐渐下降,可能受N限制,自近熟林至成熟林期逐渐升高,可能受P限制。In this study,the different stand ages of Pinus massoniana plantation in the hill and mountain site type districts,including 4 site type groups,6 site type subgroups,and 15 site types,were selected as the research objects to reveal the effects of site type and stand age on the ecological stoichiometry of Pinus massoniana plantation in Sichuan Province.And the needles C,N,and P contents and stoichiometric ratios of Pinus massoniana were analyzed.The results showed that the needles average C,N,P contents of Pinus massoniana in Sichuan Province were 524.34±29.09,10.28±0.51,and 0.99±0.18 g/kg,respectively;and the needles C∶N,C∶P,and N∶P ratios were 51.08±3.68,543.90±97.40,and 10.73±2.24,respectively.Across all the plots,the needles C,N,P contents and stoichiometric ratios were significantly(P<0.05)affected by the site type and the stand age.Within the same stand age,the needles C∶N,C∶P,and N∶P ratios were higher in the hill than in the mountain,and the C content,C∶N ratio,and C∶P ratio were higher in the sandy yellow soil,lower slope of the hill,and the sunny steep(15°-35°)slope in 600-1000 m altitude of the mountain.The suitable site types for Pinus massoniana in Sichuan Province were the lower part of the hilly sandy yellow soil slope and the 600-1000 m altitude sunny steep(15°-35°)slope of the mountain sandy yellow soil.In these suitable sites,the needles C storage and the utilization efficiency of needles N and P nutrients were higher than the other sites.Within the same site type,contrary to the change trend of needles N and P content,the needles C content and stoichiometric ratios decreased with the age of forest during the period from the young stand to the near mature stand,while increased with the age of forest during the period from the near mature stand to the mature stand.The Pinus massoniana may have been limited by N before the near mature stand but limited by P after this age of forest.

关 键 词：马尾松人工林 立地 针叶 生态化学计量特征 林龄 

分 类 号：S718.5[农业科学—林学]