滇中高原及干热河谷薪材树种热值研究

A STUDY ON CALORIFIC VALUE OF FUELWOOD SPECIES IN THE XEROTHERMIC VALLEY AND IN THE CENTRAL YUNNAN PLATEAU

１９９１年以来，对安宁、玉溪、东川、元谋４个试验基地的供试树种和部分乡土树种，共计３５个树种，用ＧＲ～３５００Ｂ微电脑热量计对薪材热值进行了分析。结果表明，滇中高原直干桉，赤桉、黑荆、圣诞、木荷、麻栎、锥连栎、苦刺等８个树种为优质薪材树种，每千克薪材的热值达１８８５０ｋＪ以上，与褐煤的热值相当，其次为大叶桉、蓝桉、山樱桃、桤木等９个树种，薪材热值在１６７５０～１８８５０ｋＪ之间。干热河谷区赤桉、直干桉、巨桉、黑荆、圣诞、马占相思、苏门答腊金合欢、刺槐等８个树种为优质薪材树种，其次为柠檬桉、银合欢、念珠相思等１１个树种。

Since fuelwood forest is mainly to produce heat energy resources,calorific value of fuelwood is an important index of tree species selection for fuelwoodforest.For this reason,a determination of the calorific value of fuelwood for 35 treespecies from 4 test sites- Anning,Yixi,Dongchuan,Yuanmou was conducted withGB3 500-B calori-meter for“Researches in Choice of Suitable Tree Species,Techniqueof Forestation and Working Types of Fuelwood Forest in the Central Yunnan Plateauand Xerothermic Vallev of Yunnan Province”that is a strategic item of“8thFive-YearPlan”in 1991～1995The main results were summarized as follows:(1)in theCentral Yunnan plateau,there were 8 tree species-Eucalyptus maideni,E.globulus,Acacia dealbala,Schima wallichii etc.above 18 850 kJ/kg of the calorinc value ofhelwood,there were 9 tree species between 16 750～18 850 kJ/kg of the calorific valueof fuelwood;(2)in Xerothermic valley,there were also 8 tree species──E.camaldul-ensis,A.suma,A mangium,Robinia pseudoacacia etc above 18 850 kJ/kg there were11 tree species between 16 750～18 850 kJ/kg of the calorific value of fuelwood.Where-as the caloriflc value of fuelwood above tree species is nearly as high as brown coal,itsuggests that above tree species are recommended to extensive planting of fuelwood for-est in the Central Yunnan plateau and Xerothermic vallev of Yunnan Province.