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《西双版纳热带季节雨林和哀牢山中山湿性常绿阔叶林优势植物及地表凋落物层的热值》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、X植物生态学报2007,31(3)457~463JournalofPlantEcology西双版纳热带季节雨林和哀牢山中山湿性常绿阔叶林优势植物及地表凋落物层的热值1,21,2131,233黄钰辉官丽莉周国逸罗艳唐建维刘玉洪(1中国科学院华南植物园,广州510650)(2中国科学院研究生院,北京100049)(3中国科学院西双版纳热带植物园,云南勐腊666303)摘要测定云南西双版纳热带季节雨林和哀牢山中山湿性常绿阔叶林优势种植物叶片及地表凋落物层的干重热值,分析并比较了两地群落类型热值的差异及其与地理条件的
2、关系。植物叶片分为鲜叶和凋落叶,地表凋落物层分为新鲜凋落物层(L层)和腐叶层(F层)进行取样测量,所有样品在60℃烘干至恒重,样品热值采用Parr1261氧弹式热量计测量。结果表明:西双版纳的11种植物鲜叶和凋落叶干重热值的变化范围分别是14.5953~19.8639-1-1和14.0467~19.8840kJ·g,L和F层的平均干重热值分别为17.4196和14.7805kJ·g;哀牢山的10种植物鲜-1叶和凋落叶干重热值的变化范围分别是17.8051~21.5253和17.8934~21.4367kJ·g
3、,L和F层的平均干重热-1值分别为19.2084和17.4947kJ·g。两地植物鲜叶与凋落叶干重热值的大小顺序近似或一致,即植物鲜叶干重热值越高,其凋落叶干重热值也越高;植物鲜叶与凋落叶干重热值的差值有正有负,因物种而异;西双版纳凋落物L与F层之间的热值差值显著地大于哀牢山两层凋落物的热值差值,可能是由西双版纳凋落物的分解速率较快导致的;两地样品的平均干重热值的顺序为:鲜叶>凋落叶>L层>F层;将两地的相应样品对比发现,干重热值呈现为哀牢山>西双版纳,体现出高海拔>低海拔、高纬度>低纬度以及常绿阔叶林>热带
4、季节雨林的特点。关键词优势种干重热值鲜叶凋落叶凋落物层能量生态学GROSSCALORICVALUESOFDOMINANTSPECIESANDLITTERLAYERINMID2MONTANEMOISTEVERGREENBROAD2LEAVEDFORESTINAILAOMOUNTAINANDINTROPICALSEASONRAINFORESTINXISHUANGBANNA,YUNNAN,CHINA1,21,2131,233HUANGYu2Hui,GUANLi2Li,ZHOUGuo2Yi,LUOYan,TANGJi
5、an2Wei,andLIUYu2Hong12SouthChinaBotanicalGarden,ChineseAcademyofSciences,Guangzhou510650,China,GraduateUniversityofChineseAcademyofSciences,3Beijing100049,China,andXishuangbannaTropicalBotanicalGarden,ChineseAcademyofSciences,Mengla,Yunnan666303,ChinaAbstra
6、ctAimsOurobjectivewastoestimatethegrosscaloricvalues(GCVs)fortwovegetationtypesandexaminethedifferences.MethodsSamplesoffreshleaveswerecollectedfrom10dominantspeciesinmid2montanemoistevergreenbroad2leavedforestinAilaoMountainand11dominantspeciesintropicalse
7、asonalrainforestinXishuangbanna.Leaflittersamplesalsowerecollectedanddividedintofreshlitterlayer(Llayer)andfermen2tationlayer(Flayer).Samplesweredriedtoconstantweightat60℃,andGCVofeachsamplewasmeasuredbyaPARR1261oxygenicbombcalorimeter.ImportantfindingsTher
8、ewasawiderangeofGCVsinfreshleavesandlitterlayersinbothforests.TheGCVsinfreshleaveswerehigherthaninleaflitterforallbutsixspecies,withthedifferencesbetweenfreshleavesandleaflitterdependentonspeciescharac