河北省北沟林场针阔混交林空间结构优化技术研究

Study on tree spatial structure optimization technique of mixed forest in Hebei Province

为了研究针阔混交林空间结构特征,用林分直径分布特征以及空间结构3个参数(角尺度、混交比和大小比数)对河北省北沟林场的华北落叶松、白桦混交林进行了分析。结果表明:该林分直径分布中,白桦的直径分布均匀,落叶松较差;林分平均角尺度为0.352 6,林分基本处于均匀分布状态;林分平均混交度为0.425,处于中度混交;从大小比数来看,林分中白桦处于优势地位,更新树种五角枫被压严重。以林分空间结构3个参数为依据,提出林分结构调整的几种方法,使林分结构更加接近最优状态。

The stand structure characteristics of larch and birch in Hebei Weichang were ana- lyzed using spatial structure parameters of angle index, mingling neighborhood comparison and diameter distribution. The result showed that birch was uniform, larch was poor in stand diameter distribution. The level structure showed the angle value was 0. 352 6, and the pattern of horizontal distribution was uniform. The average value of mingling was 0. 618, it was moderate mixed; birch was in a dominant position from the neighborhood comparison, update the species maple was pressed serious. Based on the three parameters of stand spatial structure, several methods were proposed about adjustment of stand structure, it will make stand structure closer to the optimal state.