C,N,P Stoichiometry Of Plants And Soil In The Wetland Of Yellow River Delta

Suaeda Heteroptera community, Suaeda community, Tamarix community,salty aquatic Reed, freshwater Reed community in the Wetland and Weed community of Yellow River Delta were selected as the investigative object. There were mainly two parts of experiment in this research:Collecting plant and soil samples and Analysis of indoor test. Using statistics and GPS positioning method, we analyzed several issues as followed:(1)The correlation of C,N,P of dominant species and characteristics of ecologicalstoichiometry in different plant organs.(2)The C assimilation capacity and utilization of element of plant were low in this area. As the succession process C content increased slightly. C content of leaf was higher than stem and root that was adapt to the function of plant.(3)Soil organic C, total N content and available nitrogen and phosphorus were in low level. Coefficient of variation of soil C, total N and available P were larger while that of total P NH4+-N and NO3--N were less. Nutrient contents were decreased with profile depth.(4)Soil C:N, C:P and N:P were in the same change trend and were low. With profile depth soil C:N, C:P and N:P became low. C:P and N:P were reduced. Soil nutrient was stable in the Wetland of Yellow River Delta.(5)Analysis showed that N was the limited nutrient element.(6)Soil C:N, C:P and N:P were closely related with water-soluble eight major ions in the soil, especially for Na+, Cl" and Ca2+. Salt ions and pH values had a significant effect on soil C:N, C:P and N:P.