杉木萌芽纯林与混交林生长量及经济效益的研究

The Study on Growth Increment and Economic Benefit of Chinese Fir Sprouting Pure and Mixed Forests

在杉木林采伐迹地上,通过不炼山、套种火力楠与深山含笑,进行杉木萌芽纯林与混交林的对比试验,9a试验结果表明:混交林中杉木的平均胸径、树高、单株材积、地上部分单株生物量分别比杉木萌芽纯林增加4 04%、8 75%、16 3%、1 43%;混交林中火力楠和深山含笑生长良好,混交林总蓄积量和乔木层地上部分总生物量分别为杉木纯林的1 47倍和1 32倍;混交林的投入产出比高于杉木萌芽纯林,说明本模式是恢复和提高杉木连栽地土壤生产力的可行方法。

On the cutting blank of Chinese fir forest,the pure and mixed forests regenerated by no slash burning, reserving Chinese fir sprouts,and inter-planting Michelia macclurei and M.maudiae were studied with the comparative method.Nine years study results showed that the DBH,height,single tree stem volume,and above-ground biomass of Chinese fir in the mixed forests increased by 4.04%,8.75%,16.3%,and 1.43% respectively compared with those of the Chinese fir sprouting pure forest.Michelia macclurei and M.maudiae in the mixed forests grew well.The total growing stock and above-ground tree biomass of the mixed forest were 1.47 and 1.32 times of those of the Chinese fir sprouting pure forest.The ratio of output value to investment of mixed forest was higher than that of pure forest.So,it was the feasible method to restore and improve the soil productivity of Chinese fir continuously planting land to build up mixed forest.