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1、生态学杂志ChineseJournalofEcology2007,26(9):1335-1338*杉木人工林凋落物量对氮沉降增加的初期响应1,21,2**3242樊后保刘文飞裘秀群徐雷王强陈秋凤123(南昌工程学院,南昌330029;福建农林大学,福州350002;安徽工程科技学院,安徽芜湖241000;4萍乡高等专科学校,江西萍乡337055)摘要通过野外模拟试验,研究了杉木人工林凋落物对氮沉降增加的初期响应。试验设-2-1-2-1计为4种处理,分别为N0(0kgN#hm#a,对照)、N1(60kgN#
2、hm#a)、N2(120-2-1-2-1kgN#hm#a)、N3(240kgN#hm#a),3次重复。通过2年监测发现,对照样地-2的年凋落量为2427151kg#hm,而经N1、N2、N3处理后,其年凋落物量分别为2238110、-22286166和2599150kg#hm。表明高氮(N3)处理显著增加了杉木林凋落物量(P<0105),而中低氮处理(N1、N2)没有显著影响。各处理的总凋落物量表现出明显的季节动态,在2、5和7月出现3个比较明显的峰值。在凋落物的组成中,落叶占总凋落量的70149%~73
3、167%,其次分别为落枝(19138%~20139%)、碎屑物(4198%~7170%)、落果(1111%~2116%)和树皮(0129%~0133%)。LSD多重比较显示,N3处理对落叶和落果产生显著影响,对其它组分的影响不明显。关键词氮沉降;杉木人工林;凋落物;季节动态中图分类号Q948文献标识码A文章编号1000-4890(2007)09-1335-04ResponsesoflitterfallproductioninChinesefirplantationtoincreasednitrogende
4、pos-i1,21,2324tion.FANHou-bao,LIUWen-fei,QIUXiu-qun,XULei,WANGQiang,CHENQiu-212feng(NanchangInstituteofTechnology,Nanchang330029,China;FujianAgricultureand3ForestryUniversity,Fuzhou353002,China;AnhuiUniversityofTechnologyandScience,Wuhu4241000,Anhui,China
5、;PingxiangCollege,Pingxiang337055,Jiangxi,China).ChineseJournalofEcology,2007,26(9):1335-1338.Abstract:Afieldsimulatedtestwasconductedtostudytheeffectsofnitrogendepositiononthe-2litterfallproductionofChinesefirplantation.TreatmentsweredesignedasN0(0kgN#hm
6、#-1-2-1-2-1-2a),N1(60kgN#hm#a),N2(120kgN#hm#a)andN3(240kgN#hm#-1a),withthreereplicatesineachtreatmen.tTwoyearsobservationshowedintreatmentsN1,-2N2andN3,theannuallitterfallproductionwas2238110,2286166and2599150kg#hm,-2respectively,incontrastto2427151kg#hmi
7、nthecontrol(N0).HighNdeposition(N3)in-creasedthelitterfallproductionsignificantly,whilelow-to-mediumNloads(N1andN2)hadnoobviouseffectsoni.tThemonthlylitterfallproductioninalltreatmentsshowedsimilarseasonaldynamics,withthreepeaksoccurringinFebruary,MayandJ
8、uly,respectively.Inthelitterfalls,fallenleafaccountedfor70149%-73167%ofthetota,lfollowedbybranch(19138%-20139%),debris(4198%-7170%),fruit(1111%-2116%),andbark(0129%-0133%).TreatmentN3hadsignificanteffectsontheamount