银川平原湿地常见植物种间关系研究

在样方调查的基础上，应用校正χ²检验，结合Jaccard关联指数、Pearson 相关系数和Spearman 秩相关系数,研究了银川平原湿地植物群落的种间关系, 计算测定了33 种常见植物共528个种对的种间关联关系。结果表明: ① 3种检验方法表达的种间关系相似但不完全相同。 χ²检验共有24个种对正关联, 4个种对负关联，其中有12对极显著正关联，1个种对极显著负关联； Pearson 相关系数检验，有30 个种对正相关,其中有19个种对极显著正相关，无负相关种对； Spearman 秩相关系数检验，有50个种对呈正相关,8个种对呈负相关，其中有31个种对极显著正相关，1个种对极显著负相关。② 银川平原湿地33种常见植物可划分为4个生态种组，即水生植物种组、湿生植物种组、中生植物种组和旱生植物种组，组内植物间多为显著正关联，种组植物间多为负关联。③ 银川平原湿地植物群落存在独立分布格局,植物群落不够稳定, 尚处于不断的演替之中。

Interspecific Relationships among Common Plant Species  in Wetlands in the Yinchuan Plain

Interspecific relationships among plant species in wetlands in the Yinchuan Plain were studied using the χ²-test, Jaccard associated index, Pearson correlation coefficient and Spearman rank correlation coefficient. The results are as follows: ① The interspecific relationships among the plant species could be expressed by 3 methods, and they were similar but not identical. Theχ²-test revealed that there were 24 positive pair-species associations and 4 negative ones, in which 12 were significantly-positive associations and 1 was significantly negative one. The Pearson correlation coefficient test revealed that there were 30 positive pair species correlations without negative one, in which 12 were significantly positive associations. Spearman rank correlation coefficient test revealed that there were 50 positive pair-species correlations and 8 negative ones, in which 31 were significantly positive associations and 1 was significantly-negative one; ② The 33 common plant species in wetlands in the Yinchuan Plain could be divided into 4 ecological species groups, i.e. the hydrophyte, hygrophyte, mesophyte and xerophyte species groups. There were mostly the significantly positive associations among plant groups but negative or significantly negative ones among species groups; ③ In the Yinchuan Plain, the wetland plant communities were usually in an independent pattern, so that the communities were not stable yet and still in a constant succession.