氮沉降对荆条灌丛凋落物元素归还量的影响  

Impacts of Nitrogen Deposition on Annual Macronutrient Input From Litterfall in a Vitex Negundo var.Heterophylla Shrubland

作　　者：张建华 冯琳 张晓璐 霍巧丽 刘兴华 赵旭文 ZHANG Jianhua;FENG Lin;ZHANG Xiaolu;HUO Qiaoli;LIU Xinghua;ZHAO Xuwen(Department of Biology,Xinzhou Teachers University,Xinzhoa 034000,China;Guancenshan State-owned Forest Administration,Ningwu 036000,China)

机构地区：[1]忻州师范学院生物系,山西忻州034000 [2]山西省管涔山国有林管理局,山西宁武036000

出　　处：《忻州师范学院学报》2021年第5期11-18,共8页Journal of Xinzhou Teachers University

基　　金：国家自然科学青年基金项目(31700413);忻州师范学院教学综合改革及人才培养模式项目(GYB201916);忻州市科技计划项目(20190101-2)。

摘　　要：对北京东灵山的荆条灌丛进行氮添加试验,设置4个氮沉降水平:对照(0 N_(0))、低氮(20 N_(1))、中氮(50 N_(2))、高氮(100 N_(3))kg N·hm^(-2)·a^(-1),研究灌丛凋落物量和养分输入量对模拟氮沉降的响应。结果显示:氮沉降表现出增加凋落物凋落产量的趋势,但处理之间差异不显著。氮沉降增加叶、枝和花果凋落物中N元素含量,但对其他元素没有显著影响。5年的模拟氮沉降处理对荆条灌丛凋落物养分归还量的影响不明显。A simulated nitrogen(N)deposition experiment was conducted in a Vitex negundo var.heterophylla shrubland in Mt.Dongling,Beijing,and four N treatments were installed,namely control(N_(0),0 kg N·hm^(-2)·a^(-1)),low N(N_(1),20 kg N·hm^(-2)·a^(-1)),medium N(N_(2),50 kg N·hm^(-2)·a^(-1))and high N(N3,100 kg·N·hm^(-2)· a^(-1)).The responses of litterfall production and annual nutrient input from litterfall to nitrogen deposition were studied.The results showed that nitrogen deposition did not significantly elevate the litterfall production.N deposition increased the concentrations of N in leaf,branch and fruit litter,but had no significant effect on other elements.5 years simulated nitrogen deposition had little effect on the annual nutrient input from litterfall of V.negundo var.heterophylla shrubland.

关 键 词：氮沉降 凋落物量 养分归还量 荆条灌丛 华北地区 

分 类 号：Q148[生物学—生态学]