Spatiotemporal Variation of Plant Communities at Xixi Wetland

Plant communities were surveyed in 2014 for three times at 9 observation points in Xixi National Wetland of Hangzhou, Zhejiang province. Analysis were made on annual change of arbor, shrub, herb and aquatic communities from 2010 to 2014, with data of 2010－2013, among them, 6 points data from 2010, the left from 2012. The last investigation showed that there were 83 plant communities, including 22 woody plant communities, 26 aquatic herb communities, 35 terrestrial herb communities, accounting 42.2%, 26.5%, 31.3% of the total. It had 10 more communities in 2014 compared to that in 2013, among them, 4 communities were natural plant, the other 6 were planted ones. Plant communities observed from 9 points from 2010 to 2014 increased year by year and the average growth rate was 88%. Attention needs to be paid on Hydrocotyle vulgaris, who was observed at 2 more observation points.