黄竹人工林林分结构与产量预测

目的]预测黄竹人工林林分结构与产量。方法]以广西田东县黄竹人工林为调查对象,通过采伐老竹、每竹检尺、单株称重,分析单株竹秆鲜重与胸径、高度之间的相关性。结果]5年生林分立竹量9 779株/hm2,竹材鲜重18.1~32.7 t/hm2,平均23.5 t/hm2,立竹平均胸径3.9 cm,平均高度7.7 m。单株竹秆鲜重(W)与胸径(D)、高度(H)之间的最优回归方程为W=0.135DH+0.001(DH)2,R2=0.969;单株鲜重与胸径的最优回归方程为W=-0.153D+0.325D2,R2=0.955。结论]在竹林生产经营中可利用胸径、高度及采伐株数进行竹林产量预测,在竹子高度测定困难时,也可利用胸径和采伐株数进行测产。

The Stand Structure and Yield Prediction in Dendrocalamus membranaceus Plantation Forest

Objective] To forecast Dendrocalamus membranaceus plantation forest structure and yield. Method] Taking Dendrocalamus mem-branaceus plantation in Tiandong County of Guangxi as the research object, by cutting the old bamboo, measuring the diameter at breast height (DBH) and culm height, individual culm weighing, the relativity among fresh culm weight,DBH and culm hight were analyzed.Result]The results showed that there were the 5 years standing forest of 9779 plants/hm2 .In the 5 years old bamboo forest, bamboo timber of the fresh culm weight was 18.1 ~32.7 t/hm2 , and the average of fresh weight was 23.5 t/hm2 , and the average of DBH was 3.9 cm, and the average of culm height was 7.7 m.Optimal regression equation of the fresh weight(W) to DBH(D) and culm height(H) was that W=0.135DH+0.001(DH)2, R2 =0.969;the optimal regression equation of plant fresh weight to DBH was that W =0.153 D +0.325 D2, R2 =0.955. Conclusion]In the production and management of bamboo forest,the bamboo production can be predicted by DBH, culm height and cutting number.If culm height was difficult to measure, the bamboo production can be predicted by DBH and cutting number.