萌芽杉木——酸枣混交林生长与生物量研究初报

Preliminary Study on the Growth and Biomass of a Chinese fir and Choerospondias Axillaris Mixed Plantation

对福建明溪21年生、13地位指数的第1茬杉木林采伐迹地上,通过不炼山、保留杉木萌芽条、套种酸枣更新的5年生萌芽杉木——酸枣混交林的生长状况与生物量进行了研究,结果表明:二茬萌芽更新的杉木酸枣混交林生长良好,杉木的平均胸径、树高、单株材积、地上部分单株生物量分别为:5.6cm、4.5m、0.00817m3、4.788kg分?1,与萌芽更新的杉木纯林相比,均略有提高。分别比杉木纯林增加3.70%、1.12%、3.29%、2.79%混交林中酸枣的平均胸径、树高、单株材积、地上部分单株生物量分别为:5.0cm、6.10m、 0.00754m3、3.878kg分?1,除了平均高外,均小于杉木;混交林总蓄积量和乔木层总生物量分别为24.884m3穐m-2和13.32t穐m-2,分别是纯林的2.29倍和2.08倍。萌芽杉木 ——酸枣混交林是一种生产力较高的混交模式。

Growth and biomass of a 5-year-old mixed plantation of Chinese fir and Choerospondias axillaris, regenerated by no slash burning, reserving Chinese fir sprouts and inter-planting Choerospondias axillaris trees after chera-felling a 21-year-old,site index 13,first rotation Chinese fir plantation were studied. The results showed that the second rotation Chinese fir-Choerospondias axillaris mixed plantation were growing well. The DBH,height,single tree stem volume and above-ground biomass of Chinese fir in the mixed plantation were,respectively,5.6cm,4.50m,0.00817m3 and4.788kg穝tem-1,and respectively, 3.70%, 1.12%, 3.29%and 2.79%slightly higher than those in the pure sprout-regenerated Chines fir plantation. The DBH, height, single tree stem volume and above-ground biomass of Choerospondias axillaris in the mixed plantation were, respectively,5.0cm, 6.10m, 0.00754m3and3.787kg穝tem-1, lower than those of Chinese fir except for the tree height. Total growing stock and tree biomass of the mixed plantation was 24.884m3穐m-2and13.32t穐m-2, respectively,and 2.29and 2.08times higher, respectively, than those of the pure plantation. Sprout-respectively Chinese fir and Choerospondias axillaris mixed plantation is a mixture pattern with high productivity.