摘要
为明确氮(N)沉降对川中丘陵区人工林养分限制特征及生长策略的影响,以该区域马尾松和柏木为研究对象,通过原位N添加实验模拟大气N沉降,分析了两种人工林的当年生小枝性状、叶片性状和叶片N、P化学计量对不同N添加浓度的响应。结果显示:N添加显著降低了马尾松和柏木人工林小枝生物量、出叶强度、叶片全磷,含量、比叶面积和叶绿素含量、显著升高了叶片氮磷比和叶干物质含量,且各种处理下叶片氮磷比均大于16。研究表明,N添加明显抑制了两种人工林的树木生长,并且N添加条件下两种人工林倾向于“缓慢投资-收益型”的保守生长策略。
In order to clarify the effects of nitrogen deposition on nutrient limitation characteristics and growth strategies of plantations in the hilly area of central Sichuan,this study took Pinus massoniana and Cupressus funebris in this area as the research objects,simulating atmospheric nitrogen(N)deposition through in-situ N addition experiments to analyze the responses of current twig traits,leaf traits and leaf N and P stoichiometry to different N addition concentrations in the two plantations.The results are as follows:N addition significantly decreases the twig biomass,leafing intensity,total P content,specific leaf area and chlorophyll content in Pinus massoniana and Cupressus funebris plantations,while it dramatically increases the leaf nitrogen/phosphorus ratio and leaf dry matter content.The nitrogen/phosphorus ratio is greater than 16 under all treatments.The study indicates that N addition obviously inhibits the tree growth in the two plantations.The conservative growth strategy of“slow investment-return type”should be considered in the two plantations under N addition.
作者
彭修涛
刘榕
罗尚华
于婧
敬安兵
肖娟
PENG Xiu-tao;LIU Rong;LUO Shang-hua;YU Jing;JING An-bing;XIAO Juan(College of Environmental Science and Engineering,China West Normal University,Nanchong Sichuan 637009,China)
出处
《西华师范大学学报(自然科学版)》
2025年第2期119-126,共8页
Journal of China West Normal University(Natural Sciences)
基金
国家自然科学基金项目(31700387)
四川省科技厅科技计划项目(2021YJ0283)。
关键词
川中丘陵区
人工林
树木生长
化学计量
N沉降
hilly area of central Sichuan
plantations
tree growth
stoichiometry
nitrogen deposition
