不同生境下莼菜群落的物种多样性

采用Braun Blanquet多盖度等级法研究了苏州东山镇和杭州转塘镇莼菜群落的物种多样性.结果表明：两地半自然莼菜群落的种类组成均较为简单，其物种多样性指数均较低；随着从池塘中央向岸边生境过渡，莼菜群落的Shannon-Wiener多样性指数、Simpson优势度指数和群落均匀度指数均有显著提高；经聚类分析，同一生境类型中的样地较为相似，且池塘中央的样地比岸边的样地更为相似；线性回归和聚类分析发现，与转塘镇相比，东山镇两类生境莼菜群落间的差异性更大.

Species diversity of Brasenia schreberi community in different habitats

By using Braun-Blanquet Cover Abundance Scale method, the species diversity of Brasenia schreberi community in Dongshan Town (Suzhou City, Jiangsu Province) and Zhuantang Town (Hangzhou City, Zhejiang Province) was studied, and the results showed that in these two towns, B. schreberi community was of simple species composition and relatively low species diversity. The Shannon-Wiener diversity index, Simpson ecological dominance index, and community evenness index all increased obviously when the habitat shifted from pond center to bank nearby. B. schreberi community was similar in the same type habitats of these two towns, and of much more similarity in pond center than at bank nearby. Compared with Zhuantang Town, Dongshan Town had a greater difference of B. schreberi community between the two habitats.