外源性氮和磷对尾叶桉凋落叶分解的影响

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1、安徽农业大学学报,2017,44(3):409-414JournalofAnhuiAgriculturalUniversity[DOI]10.13610/j.cnki.1672-352x.20170524.020网络出版时间：2017/5/2411:27:02[URL]http://kns.cnki.net/kcms/detail/34.1162.S.20170524.1127.040.html外源性氮和磷对尾叶桉凋落叶分解的影响*佘汉基,郑欣颖，薛立，蔡金桓(华南农业大学林学与风景园林学院，广州510642)摘要：通过研究外源性氮和磷对尾叶桉（Eucalyptusurophyl

2、la）凋落叶分解速率、分解过程中N、P含量变化的影响，为森林养分管理提供科学依据。采用尼龙网袋分解法，在广东的尾叶桉林内建立4块5m×5m的小样地，放置凋落叶样品，测定其分解速率和N、P含量变化。结果表明，外源性N在试验前期分解速率有促进作用，后期阻碍了凋落叶分解。24个月时对照、施N、P和N+P的凋落叶残留量分别为初始重量的0.23%、1.59%、0.19%和0.49%。凋落叶分解24个月时尾叶桉林地各处理的凋落叶N、P含量均大于初始值，对照、施N、P和N+P的凋落叶N的残留量分别为初始N重量的0.54%、2.41%、0.35%和0.81%，凋落叶P的残留量分别为初始P重量的0

3、.48%、1.74%、0.56%和1.52%，表明4种处理的凋落叶N和P均为释放模式。施N抑制尾叶桉凋落叶的分解,而施P及N+P促进其凋落物的分解，表明施用P肥可以促进尾叶桉凋落叶的分解和养分循环。关键词：尾叶桉;分解；凋落叶；外源性N和P；养分释放中图分类号：S718.55文献标识码：A文章编号：1672352X(2017)03040906EffectsofNandPadditionsondecompositionofleaflitterinaEucalyptusurophyllastandSHEHanji,ZHENGXinying,XUELi,CAIJinhuan(Co

4、llegeofForestryandLandscapeArchitecture,SouthChinaAgriculturalUniversity,Guangzhou510642)Abstract:TheeffectsofexternalnitrogenandphosphorusonleaflitterdecompositioninaEucalyptusuro-phyllawoodlandwerestudiedforprovidingascientificbasisforE.urophyllanutrientmanagement.Thestudywasconductedover2y

5、earsusingthelitterbagtechniqueinYongyunForestFarm,GuangdongProvince,China.Foursmallsampleplots(5m×5m)wereestablishedintheinvestigatedstand.Withineachofthesampleplots,leaflitterswereplacedandtheirdecompositionratesandN,PandKcontentswereanalyzed.TheresultsshowedthatadditionofNimprovedlitterdeco

6、mpositionintheearlystageandimpededlitterdecompositioninthelatestageoftheexperiment.Aftertwenty-fourmonthsofdecomposition,theremainingweightofleaflitterwas0.23%,1.59%,0.19%and0.49%oftheinitialweightofleaflitterinCK,Naddition,PadditionandN+Padditiontreat-ments,respectively.Aftertwenty-fourmonth

7、sofdecomposition,theNandPcontentsinleaflitterweregreaterthantheirinitialvalues,andtheremainingNweightofleaflitterwas0.54%,2.41%,0.35%and0.81%oftheini-tialNweightinfourtreatments,respectively.TheremainingPweightofleaflitterwas0.48%,1.74%,0.56%