林地有机材料覆盖退化雷竹林地上部分生物量研究

以林地有机材料覆盖退化雷竹林的恢复提供理论依据为目标，在竹林林分结构调查的基础上，采取定位调查方法研究林地有机材料覆盖雷竹林的地上生物量分配规律。研究结果表明：退化雷竹林林分结构不合理，立竹密度过大，立竹平均胸径偏小；退化雷竹林各年龄立竹的器官平均含水率较生长正常雷竹林的高；退化雷竹林1年生立竹秆生物量比例最高，枝、叶生物量比例分别是秆生物量比例的23.10%、27.32%，随着立竹年龄的增加，秆生物量比例下降，枝、叶生物量比例提高；退化雷竹林地上部分总生物量下降，是生长正常雷竹林的69.49% ；退化雷竹林秆、枝、叶和地上部分总的相对生物量显著降低，分别为生长正常雷竹林的67.53%、55.26%、58.62%、63.74%。

Study on Above-ground Biomass of Degenerated Bamboo Forest of Phyllostachys proecox with Covering Organic Material

In order to provide theoretical basis to recovery degenerated bamboo forest of Phyllostachys proecox with covered organic material, according to the investigation of bamboo stands structure, the paper has studied on above-ground biomass. The result showed that the bamboo stands structure was unreasonable, such as larger density and smaller the average diameter under breast height. The average moisture content in every orange of degenerated bamboo forest of P. praecox was higher than that normal growth one. The ratio of one year stand biomass of degenerated bamboo forest was highest while the ratio of branches and leaves biomass were 23.10%, 27.32% comparison with bamboo stand biomass, with the age increase, the proportion of the stand biomass decline, branch and leaves increase .the total above-ground biomass of degenerated bamboo was 72.93 percent of that normal growth one, there were obvious decrease in relative biomass of the clum, branches, leaves and the total above-ground of degenerated P. proecox, which were respectively 67.53%, 55.26%, 58.62%, 63.74% of those normal growth one.