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时间:2020-04-28
《常绿阔叶林凋落物量及养分对氮沉降的响应.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第41卷第12期东北林业大学学报Vol.41No.122013年12月JOURNALOFNORTHEASTFORESTRYUNIVERSITYDec.20131)常绿阔叶林凋落物量及养分对氮沉降的响应周佳佳崔珺杨佳李鹏徐小牛(安徽农业大学,合肥,230036)(北京大学)(安徽农业大学)摘要通过野外模拟试验,研究了氮沉降增加对安徽祁门亚热带常绿阔叶林凋落物量及养分季节动态的影-2-1-2-1-2-1响。试验设计为对照(CK,0)、高氮(T1,100kg·hm·a)、高氮+磷(T2,100kg·hm
2、·a+50kg·hm·a)3-2种处理。通过1a监测,结果表明:(1)中坡3种处理的年凋落量分别是6.87、5.48和6.72t·hm,T1、T2处理一-2定程度上抑制了凋落物量的增加。坡顶3种处理的年凋落量分别是6.80、5.66和7.01t·hm,T2处理增加凋落物产量,T1与之相反。(2)凋落物中各组分所占比例从大到小顺序为:叶>枝>花果>杂质。(3)3种处理月凋落特征相似。(4)主要元素年均质量分数从大到小顺序为:N、K、Ca、Mg、P,落叶中主要养分质量分数最高。T1、T2处理显著增加了
3、凋落物N质量分数,增幅为7.81%~22.33%,且效果T2>T1。T1处理降低了P、K、Mg质量分数,T2处理增加了P、Mg质量分数,降低了K质量分数。从凋落量及养分含量两方面来说,向森林生态系统输入植物生长必需的营养元素可以缓解氮沉降的影响。关键词亚热带常绿阔叶林;凋落物量;养分;氮沉降分类号Q948.3ResponseofNitrogenDepositionSimulationonLitterProductionandMacronutrientsofEvergreenBroad-Leaved
4、Forest/ZhouJiajia,CuiJun,YangJia(AnhuiAgriculturalUniversity,Hefei230036,P.R.China);LiPeng(BeijingForestryUniversity);XuXiaoniu(AnhuiAgriculturalUniversity)//JournalofNortheastForestryUniversity.-2013,41(12).-47~51,127Afieldsimulatedtestwasconductedto
5、studytheeffectsofnitrogendepositiononlitterproductionandnutrientsofa2-1subtropicalevergreenbroad-leavedforestinQimen,southernAnhui.ThetreatmentsweredesignedasCK(0kghm·a2-12-12-1N),T1(100kghm·aN)andT2(100kghm·aN+50kghm·aP).Foroneyearobservation,annuall
6、itter-2productionaveraged6.87,5.48and6.72t·hmforCK,T1,T2onthemiddleslope,respectively.HighNdeposition-2inhibitedlitterproduction.However,ontheflatridge,annuallitterproductionaveragedat6.80,5.66and7.01t·hmforCK,T1andT2,respectively.T2treatmentincreased
7、thelitterproductioncomparedwithCKalthoughnosignificantdifferenceappearedbetweenCKandT2.Thelittercomponentsrankedbytheiramountsconsistentlyareinthefollowingor-der:foliage>branches>sexualorgans>miscellaneous.Theseasonalpatternsoflitterfallweresimilaramo
8、ngthedifferenttreatments.Therefore,thenitrogendepositioncannotchangetheeco-physiologicalcharacteristicofdominanttrees.ThenutrientinputbylitterfallisN>K>Ca>Mg>P.T1andT2treatmentselevatedtheaverageNconcentrationsbyrangingfrom7.81%to22.33%intheli
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