摘要
杉木和松树混交试验，都是按６６％杉木加３４％松树（湿地松、加勒比松、热带松、火炬松、晚松）混交组合的，只有对照区是杉木纯林。试验林的密度为２５００株／ｈｍ￣２，其中杉木１６５０株１０．６６ｈｍ，松树８５０株／０，３４ｈｍ￣２。均是一年生实生苗于１９８３年春季造林，小区面积全是０．２ｈｍ￣２。１０年生时进行了生产力调查，并计算了生物能积累，辐射能利用，养分利用效率和归还串等。试验结果表明：杉木火炬松混交林生产力最高达到６．５５ｔ／ｈｎｔａ，养分利用效率好，每吨养分可生产生物量７３ｋｇ／ｈｎａ‘·ａ：杉木加勒比松混交林辐射能利用率最大达到３．９７％，生物能积累总计为１７３３６ｋＪＪｍ２·ａ，养分归还率最好达到４．８６％。从生产力、辐射能利用率、养分利用效率和养分归还率等综合比较，得分由大到小的顺序是：杉木晚松混交林）杉木加勒比松混交林杉木湿地松混交林杉木火炬松混交林杉木热带松混交林）杉木林。总之，经营杉松混交林经济效益优于杉木纯林。
Chinese fir and five exotic pines species Pinus elliottii Engelm., P. teada L., P. caribaea Morelet, P. rigida Mill., P. tropicatis Morelet were used in mixture expedment. The propordon of all mixed experimental plantadons, except the control plot (pure Chinese fir plantadon), was 66% Chinese fir plus 34% pines. The planting density 2 500trees / hm2, all the secdlings used were 1 -ycar-old planted in spring, in 1983. These mixed planta.ons were invesdgated 9 yean later for their producdvity, inradiance energy-use rate and nutrienttuse efficiency and nutdent retum rate in the nutrient cycling. The productivity and nubient-use efficiency were the highest in the 66% Chinese fir plus 34% P. teada mixed plantation, its biomass amount reached 6.55t/ hm2 . aand producing biomass 73kg/ hm2 . a from each kg nuoient. The inuliance energy-use rate and accurnulated biatenergy and nuvient retum rate greatest in the 66% Chinese fir plus 34% P. caribaea mdxed plantadon, the total arnount reached 3.97% and 17336kj /m2 . a and 4.86%, respecdvely. The result of the comprehensive evaluation showed that: the scores of four items and tewlve categored from greatest to last are in due order: 66% Chinese fir plus 34% P. rigida plantadon >66% Chinese fir plus 34% P. caridaea plantation > 66% Chinese fir plus 34% P. elliottii plantation > 66% Chinese fir plus 34% P. teada plantation (scored 71 .6%) > 66% Chinese fir plus 34% P. tropicalis plantation > pure Chinese fir plantation. The result also indicated that p. rigid a and P. earibaea are the suitabler pine species to be mixed with Chinese fir in the centnl substmpical area of China.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1997年第6期513-527,共15页
Scientia Silvae Sinicae
关键词
混交林
资源利用
杉木
松树
养分循环
Mixed plantation, Resource-use, lrradiance energy-use rate, Nutrient retum rate, Nutrient use efficiency
