Effects Of Soil Depth,Nitrogen Gradient And Moisture Control On The Growth And Physiology Of Sedum Sarmentosum Bunge

Our country has a large population that with few green land for each person. Followed by the rapid urbanization, heat island becames more and more serious and the greening land in the urban appear to be in short supply. Thinking about various contradiction, green roofs is a effective way to solve the problem. The experiment studied the effect of soil depth, nitrogen gradient and moisture control on the growth and physiology of Sedum Sarmentosum Bunge and expect to provide theory for green roofs application in future.We got the conclusions as follows:1) There was a significantly effect of different soil depth on length of the longest ramification, the number of ramification, biomass of overground and underground. With the increasing soil depth, the variable index increased significantly. So we concluded that increasing soil depth appropriately could provide more organic content and increase moisture content. With the appropriate soil depth, the plant could grow well and fix the root better.2) With the increasing nitrogen contents of application, the chlorophyl content increased. In the three nitrogen gradient application, S. Sarmentosum Bunge grew best in N1 treatment. The length of the longest ramification, the number of ramification, biomass of overground and underground showed the best values in N1 treatment, in contrast with controls and other nitrogen treatments.3) In the three weeks experiment of moisture control, we concluded that proline content increased significantly, the soluble sugar content did not appear marked difference in S. Sarmentosum Bunge with increasing gradient of moisture control. In the first two weeks, membrane permeability did not change siginificantly, but increased significantly in the third week. With the data, we concluded that S. Sarmentosum Bunge planted in the 3cm soil depth would grow better in summer, with irrigating less than two weeks.