Effect of Water Gradient on the Ecological Stoichiometry of Soil Carbon,Nitrogen and Phosphorus in Ophiopogon japonicus Plant
The experimental water gradient(10%,30%,70%,100%,W/W)was controlled by the potted plant test,and the growth charac-teristics of Ophiopogon japonicus,and the soil carbon(C),nitrogen(N)and phosphorus(P)ecological stoichiometry,phosphorus forms and phosphatase activity were measured,and the correlation relationships between different measurement parameters were analyzed.The results showed that with the soil moisture content increasing,the total organic carbon and total nitrogen decreased in the soil,while total phosphorus increased,and the phosphorusformshad no significant correlation with the soil moisture content.The C/N,C/P,N/P were 8.79-10.46,15.95-18.68 and 1.53-2.15,respectively,and their response characteristics to water gradient,belong to weak variants,were variant.The soil alkaline phosphatase activity under 30%water treatment was significantly higher than that under other groups(P<0.05),and the propor-tion of directly available phosphorus was 52.76%,which was higher than other water groups.The biomass,total root length and total phos-phorus in the leaf of Ophiopogon japonicus under 30%water treatment were significantly higher than other treatment groups(P<0.05).The root area and chlorophyll content were slightly higher than those in the 70%water group(P>0.05)and significantly higher than those in the 10%and 100%water group(P<0.05),and the growth of Ophiopogon japonicus was inhibited under 100%water gradient.30%water gradient was conductive to improving soil quality and the utilization of soil carbon,nitrogen and phosphorus,increasing soil nitrogen accumulation and conductive to Ophiopogon japonicus growth.
Water gradientSoil carbon,nitrogen and phosphorusEcostoichiometryOphiopogon japonicus
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