论文部分内容阅读
采用标准木法(乔木层)及样方收获法(灌木层、草本层、枯落物层),研究了马尾松低效林的4种混交林及马尾松纯林的生物量及其分配规律。结果表明:马尾松-木荷、马尾松-板栗、马尾松-南酸枣、马尾松-枫香4种混交林的乔木层生物量分别为135.501、31.499、22.138及69.725 t/hm2,而马尾松纯林的生物量为37.043 t/hm2。在各器官生物量组成中,干材生物量最大,占总生物量的40.39%~74.87%,其他组分所占的比例依次为枝(11.40%~32.67%)、叶(9.31%~26.94%)。马尾松纯林的林下植被生长旺盛,其生物量高达6.649 t/hm2;而马尾松-木荷混交林的林下植被生物量仅为3.825 t/hm2。枯落物生物量则是马尾松-木荷混交林的最多,马尾松-枫香混交林最少。所有林分的生物量平均值为68.095 t/hm2。
The biomass and its distribution of four kinds of mixed forests of Pinus massoniana and pure P. massoniana plantations were studied using standard wood method (tree layer) and quadrat harvesting method (shrub layer, herb layer and litter layer) . The results showed that the tree layer biomass of Pinus massoniana-Schima superba, Pinus massoniana-Chestnut, Pinus massoniana-Macrocephalus massoniana, Pinus massoniana-Liquidambar formosana were 135.501, 31.499, 22.138 and 69.725 t / hm2, The biomass of pure forest is 37.043 t / hm2. The biomass of all organs was the highest, accounting for 40.39% ~ 74.87% of the total biomass, and the proportions of other components were branches (11.40% ~ 32.67%), leaves (9.31% ~ 26.94% ). Under Pinus massoniana pure forest, the understory vegetation was vigorous, its biomass was up to 6.649 t / hm2, while that of Pinus massoniana-Schima superba mixed forest was only 3.825 t / hm2. The biomass of litter was the largest in Pinus massoniana-Schima superba mixed forest with the least in Pinus massoniana-Liquidambar formosana forest. The biomass of all stands averaged 68.095 t / hm2.