Effect Of The Invasion By Solidago Canadensis On Soil Properties In Hangzhou Bay WetlandReclamation Distric

Solidago canadenis is one of the worst hazardous invasive plants in our country, in order to clarify its influence for the soil system of invaded land, this experiment taked the Solidago canadenis communities and three kinds of native plant communities:Phacelurus latifolius communities, Imperata cylindricall communities and Phragmites australis communities natural distribution in the hangzhou bay wetland reclamation district in cixi city, zhejiang province as the research object,that used the methods of field sampling and researched the invasion of Solidago canadensis to the influence of soil nitrogen,phosphorus and potassium content and effectiveness、soil enzyme activity some closely related with soil nutrient metabolism and the correlation of these soil enzyme activity and soil nutrient and active organic carbon components. The results show that:1. The invasion of Solidago canadensis to the influence of soil nutrientsthe invasion of Solidago canadensis had no significant impact on content of soil total nitrogen,total phosphorus,total potassium,available phosphorus and available potassium (p> 0.01),but significantly increased the content of available nitrogen,ammonium nitrogen and nitrate nitrogen (p<0.01),among them.the content of Solidago canadenis available nitrogen in the 0-10cm soil layer is respectively 1.7 times,2.4 times and 2.0 times of Phacelurus latifolius, Imperata cylindrical and Phragmites australis.2. The invasion of Solidago canadensis to the influence of soil enzyme activityThe results showed that the urease activity in 0-1 Ocm soil layer of Solidago canadenis were extremely significantly higher than that of Phacelurus latifolius, Imperata cylindrical and Phragmites australis (p<0.001).And the contents were increased by 91.49%、116.97% and 334.88%,respectively.The soil alkaline phosphatase and saccharase activities were also significantly improved by Solidago canadenis invasiton (p<0.01).3. The relationship between soil nutrient and soil enzyme activityCorrelation analysis showed that there were significantly positive correlation between the activity of soil urease and the content of soil ammonium nitrogen,nitrate nitrogen,and available nitrogen (p<0.01).The alkaline phosphatase activity was significantly positive correlated with the content of soil total phosphorus (p<0.05).The activity of saccharase was correlated with the content of soil total nitrogen,ammonium nitrogen,available nitrogen,and total phosphorus (p<0.05).The activity of β-amylase was correlated with the content of soil total nitrogen,available nitrogen,and total phosphorus (p<0.05).The activity of β-glucosidase was correlated with the content of soil organic matter,total nitrogen,ammonium nitrogen,nitrate nitrogen,available nitrogen,and total phosphorus(p<0.05).4. The invasion of Solidago canadensis to the influence of active organic carbon componentsThe invasion of Solidago canadensis had no significant impact on the soil total organic matter content (P>0.01),but it changed the active organic carbon components,that compared with the Phacelurus latifolius, Imperata cylindrical and Phragmites australis its 0-1 Ocm soil layer microbial carbon content increased by 196.72%,180.21% and 41.47%, respectively,soluble carbon in the 0-10cm soil layer was reduced by 27.27%,40.78% and 27.27%respectively and it in the 10-20cm soil layer was reduced by 41.36%,39.49% and 29.63%,readily oxidized carbon was reduced significantly in the two layers (p<0.001).The invasion of Solidago canadenis reduced the soil pH value, increased the effectiveness of soil nitrogen and soil enzyme activity and changed the active organic carbon components, this kind of change to the soil properties with its invasiveness have close ties possibly.