关键词: 乌鳢, 乌鳢, 嗜水气单胞菌LPS, 抗氧化性能, 免疫功能, 消化功能

Abstract:

Urbanization not only makes land and geographical space a change， but also soil fertility has been a fundamental change.We calculated the membership and weight by using the fuzzy math method, principal component analysis and AHP method. This paper analyzed the temporal-spatialvariability of soil total salt, pH ,nutrient and the soil fertility index in the year of 1998 and 2008 in TEDA. We found that after 10 years of the soil survey in TEDA the soil total salt decreased markedly;soil available nitrogen,available phosphorus and organic matter increased remarkably;pH decreased slightly,available potassium rised slightly,and both change ranges were small; the soil fertility complex index increased significantly. The main reason for time-varying of soil fertility may be "shallow dense" type of underground pipe salt drainage engineering and artificial fertilization of scientific manner; the main reason for spatial variation of soil fertility is related to different sources of new soil and filling the zone in different time when the zone was construction built.