| The research and analysis of the composition of Plant functional types and the changes in Plant adaptation strategies with vegetation restoration during vegetation restoration are helpful to understand the distribution and utilization of resources and adaptation to the environment during the growth process of plants,it is of great significance for studying the response of plants to the environment and the adaptive mechanism.In recent years,due to regional climate change and the implementation of important strategies such as One Belt and One Road,the economic activities,infrastructure construction,population growth and development of tourism resources in this region have caused great threats and burdens to the wetland ecological environment in the lower reaches of Tumen River.Wetlands in this region are facing a series of ecological environmental issues such as atrophy,increased fragmentation,and reduced biological diversity.In this study,Space-time substitution method was used to select different restoration ages in the lower reaches of Tumen River for reclaimed wetlands and natural wetlands.This study is based on the plant community that has been naturally recovered from the wetlands and has been growing well in the wetlands.It is based on the functional traits of wetland plants and fine roots.According to the C-S-R strategy,using the numerical taxonomy method,the surveyed species in different recovery stages were divided into different functional forms,explore the differences in traits and Plant adaptation strategies between functional types,the composition of the plant functional types and the adaptation rules of Plant adaptation strategies with different rehabilitation age and different restoration stages in the lower reach of Tumen River were analyzed.The main results are as follows.(1)Changes of edatope in Wetland Vegetation succession with different rehabilitation age in the lower reaches of the Tumen River.The study conducted one-way analysis of variance on the wetland vegetation cover,soil moisture,and soil nutrient of different rehabilitation age in the lower reach of the Tumen River.During the restoration of the wetland vegetation of different rehabilitation ages in the lower reaches of the Tumen River,in addition to soil moisture.,soil pH,and soil organic matter,the soil total nitrogen,total phosphorus,soil available nitrogen and Soil Available Phosphorus are all show a tendency of increasing volatility with the increase of rehabilitation age.(2)Analysis on Distribution and Relevance of Plant Functional Traits in Different Rehabilitation Age Wetland Plants in lower reaches of the Tumen River.The study performed descriptive statistics on 12 plant functional traits values of wetlands of different rehabilitation ages.The difference between the maximum and minimum values of the functional traits is a minimum of 4 times and the maximum difference is 2868 times.This shows that the 12 plant functional traits at the lower reach of the Tumen River level in different rehabilitation age wetland species have significant changes,demonstrate sensitivity of plant functional traits to changes in vegetation restoration processes.Therefore,plant functional traits can reflect the main ecological processes in the process of vegetation restoration.The Pelason correlation analysis was used to analyze the Relativity of 12 plant functional traits in wetland plants of different restoration ages in the lower reaches of the Tumen River,the results show that there are relevance among the 12 plant functional traits of different rehabilitation age wetland plants in the lower reaches of the Tumen River.(3)Different rehabilitation age wetland plant functional types in lower reaches of the Tumen River and adaptive strategy.Multiple comparisons between the Cluster Analysis tree and the analysis of variance show that different wetland plants in the lower reaches of Tumen River can be divided into four different functional types.According to the C-S-R strategy,PFTS1 is more prone to "stress-disturbing",PFTS2 is more likely to "stress a competitive" PFTS3 is more "competitive",and PFTS4 is more likely to "stress a patient".(4)changes in the number of different functional species and adaptive strategies of different functional species in the downstream of tumen river.Through different fixed number of year of the recovery in the lower reaches of tumen river wetland plant functional analysis of the species as a percentage of the total number of community,and the use of stepwise regression model of the lower reaches of tumen river wetland restoration in different recovery phase values of the dominant species of plant functional traits and soil nutrient and moisture analysis show that with the extension of natural recovery time,the soil nutrient content increased,while the wetland plant each other for resources gradually fierce competition,the lower reaches of tumen river wetland plant adaptation to the environment policy changed,PFT2 "stresses a competitive" species were eliminated due to poor endurance,PFT1 "stress interference type" part of the poor toughness of species were eliminated,but the defense force and stress tolerance species continue to occupy the dominant position,now appeared on nutrient and moisture absorption rate higher competitiveness is very strong PFT3 "competitive" strong PFT4 species and resistance to stress a patient "stress" type of species,but with the extension of grain for wetland natural recovery time,the content of nitrogen and phosphorus in the soil is limited,in the competition PFT4 a patient "stress" in resources of species and nutrient competition but PFT1 "stress interference type" with PFT3 "competitive" species,eventually phased out due to phosphorus stress,the lower reaches of tumen river wetland plant adaptation to the environment policy tend to choose the stronger species can efficient use of resources competitiveness,and efficient use of resources and ability to resist stress is strong species instead of poor toughness and resources less competitive species. |
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