In allusion to water pollution of the Xiquan Lake wetland in Liaohe river basin, the three nitrogen adsorption rules were studied through the adsorption experiments of soil-plants over 3-nitrogen in Xiquan lake. The goal to protect the safety of the Xiquan lake reserve groundwater sources was attained. The native soil and the aboriginal plants named Typha orientalis Presls were used through the study and the contamination adsorption rules of the soil-plants system were analyzed and summed up

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... ough testing the removal rate of ammonia nitrogen,nitrate nitrogen nitrite nitrogen by the soil-plants. The average adsorption and degradation coefficient of the growing period and non-growing period were calculated by the first order reaction ratio equation. The research obtained that it was an adsorption capacity that the soil-plants absorbed contaminations, the adsorption reaction finished when reaching saturation--a dynamic equilibrium established between the adsorption and desorption. To some extent, soil and plants play a N buffering container role. The adsorption and degradation coefficient of the growing and non-growing periods are 5.64l/d and 4.05l/d respectively. The adsorption features of soil and plants to nitrogen were deeply researched and revealed, so as to the wetlands ecosystem was understood properly and play the ecological function role fully.