宁夏引黄灌区河北杨人工林优良林分及优树选择研究

The selection of superior stand and plus tree of Populus hopeiensis artificial forest in Ningxia irrigation area

通过标准地调查法在宁夏引黄灌区选择出3块河北杨人工林优良林分,在优良林分中通过实测确定河北杨优树选择的数量指标、形质指标和抗性指标,采用5株优势木对比和综合评分法选择出优树5株.

Taking the man-made forest of Populus hopeiensis Hu et Chow in yellow river irrigating region in northern Ningxia as the research object, first three pieces of superior stands were selected through investigated with method of standard block, next the criterion of quantity, quality, resistance for choosing plus tree were got by investigated and analyzed, then five plus trees were choosed with method of the five dominant tree and comprehensive scores.