杉木火力楠混交林生产力与改土效果研究

On the Productivity and Soil Fertility of Mixed Forest of Cunninghamia lanceolata and Michelia macclurei Dandy

1990年,在杉木采伐迹地上开展了杉木火力楠混交林(1:1和1:2)和杉木纯林对比试验.研究结果表明:杉木火力楠1:1和1:2混交林生长快于杉木纯林.经方差分析可知,混交林与纯林之间杉木树高、胸径、单株材积差异达显著水平;1:1杉木火力楠混交林单位面积生物量高于1:2混交林,1:2混交林生物量又高于杉木纯林.林木各器官生物量大小顺序表现出干＞枝＞叶＞根＞根桩,而枝叶生物量总和大于主干生物量;杉木火力楠混交林土壤密度低于杉木纯林林地土壤,而持水量、孔隙度、通气度均高于纯林林地土壤;混交林林地土壤有机质、全氮、水解氮、速效磷、速效钾含量均高于纯林土壤.

Comparative experiment of pure stand of Cunninghamia lanceolata and mixed stand of Cunninghamia lanceolata and Michelia macclurei Dandy was carried out in 1990. The results showed that the growth of mixed stand of Cunninghamia lanceolata and Michelia macclurei Dandy (1∶1 and 1∶2) was faster than that of pure stand of Cunninghamia lanceolata . The difference of average height, diameter and individual volume of Cunninghamia lanceolata between mixed forest and pure stand was obvious. The biomass of mixed forest (1∶1) was higher than that of mixed forest (1∶2) as well as mixed forest (1∶2) was higher than that of pure stand of Cunninghamia lanceolata , the biomass of every organ showed: stem>branches>leaves>roots>stump, while the total biomass of branches and leaves was more than that of tranks; The soil indensity of mixed forest was lower than that of pure stand of Cunninghamia lanceolata while water-holding amount, pore degree, aerating degree of mixed forest were higher than those of pure stand. The soil organic matter, total nitrogen, total phosphorous, available nitrogen, available phosphorous and available potassium of mixed forest were higher than those of pure stand of Cunninghamia lanceolata .