Wetland degradation in the Yellow River delta region occurs due to petroleum development

increasing human activities

and environmental changes. In order to understand the wetland degradation processes，sampling and survey on plant community were conducted by selecting the typical wetland plots. Meanw bile

soil features including organic matter

nutrient s

and physiological characters

as well as some soil enzyme activities were analyzed. Results showed that the plant succession was form Imperata cylindrica

to Suaeda glauca

to Tamardx chdnensds

to barren land. Consequently

soil organic matter content was decreased by 81.0%

67.4%

and 59. 5%

respectively

when form Imperatacyldndrdca was compared with the other 3 forms. For total N

the percentages were 61.1%

59. 6%

and 41.2%and for effective P

19.5%

7.9%

and 4.7%

respectively. The soil enzyme activities such as urease and invertase fell as well

while soil salinity rose during vegetation succession. It is concluded that plant community succession interacts with soil property change. Soil salinization speeds up flora succession reversely

while plant community suc-cession in adverse environment also has a certain effect on soil features. In the process

soil moisture and sa-unity movement are the key factors.