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在第4次全国中药资源调查的基础上,以海南西南部乐东县50种国家重点药用植物为对象,基于2×2联列表,应用X2统计量、联结系数AC和共同出现百分率PC为参数,研究分析了频度≥0.054的50种重点药用植物的种间联结性特征。结果表明,在50个物种组成的1 225个种对中,X2检验有436对表现为正关联,有789对表现为负关联,0对无关联,正负关联比为0.552 6。其中仅有35个种对表现显著或极显著正关联,有1个种对表现显著负关联。在1 225个种对中,大多数种对联结关系未达到显著水平,种对间联结性较弱。由于药用植物分布分散、人为干扰导致生境破碎化,共同出现于同一样地的机会比较少,导致了种间联结的松散性。通过种间联结性研究,可为将来保护这些药用植物提供理论依据。
On the basis of the 4th national survey of Chinese medicine resources, taking 50 national key medicinal plants in Ledong County of southwestern Hainan as the object, based on the 2 × 2 co-list, using the X2 statistics, the joint coefficient AC and the common appearance percentage PC Parameters, studied the frequency of ≥0.054 50 kinds of key medicinal plants interspecific association characteristics. The results showed that there were 436 positive correlations in the X2 test, of which 789 showed negative correlation, of which 0 was unrelated and the positive-negative correlation was 0.552 6 among the 1 225 pairs of 50 species. Only 35 of them showed significant or very significant positive correlation with performance, and 1 species showed a significant negative correlation with performance. Among the 1 225 species pairs, most of the species did not reach significant level on the linkage relationship, and the relationship among species was weak. Due to the scattered distribution of medicinal plants, man-made disturbance leads to the fragmentation of habitat and the chances of common occurrence in the same plot are relatively small, resulting in the looseness of interspecific association. Through interspecific association studies, it can provide a theoretical basis for the future protection of these medicinal plants.