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Lanzhou University (2019)

Nutrient Resorption of Plants in Different Habitats of Desert Ecosystems in Arid Regions

於婷;

Titre : Nutrient Resorption of Plants in Different Habitats of Desert Ecosystems in Arid Regions

Auteur : 於婷;

Grade : Master’s Theses 2019

Université : Lanzhou University

Résumé partiel
Nutrient resorption is one of the most important survival strategies to deset plants,which is vital to the composition and stability of plant community,and nutrient cycle of ecosystem.Most of the previous studies about nutrient resorption of plants have focused on grassland,forest and field ecosystem,while the studies in the desert ecosystems are still limited.Moreover,no pulications have studied the relationship between nutrient resorption and water use efficiency to date.Exploring the plant nutrient resorption in desert ecosystem will not only benefit to understanding plant nutrient use strategies under abiotic stresses but also provide a basis for plant protection in this area.In order to explore the relationship between nutrient resorption and ecological adaptability of desert plants,we studied the characteristics of water use efficiency and resorption efficiency in the community level and individual level of three key nutrients including nitrogen(N),phosphorus(P)and potassium(K).Influence of various factors on the resorption efficiency for C3 plants in individual level in different habitats such as desert,gravel desert and saline meadow of Minqin County.The main results are shown below :(1)The average resorption efficiency of N,P,K were 57.63%,56.89%and48.73%,all of them were significantly lower than the global averages.The average stable carbon isotope abundance(δ13C)of C3 plants was-25.04‰,which were significantly higher than the global averages,while C4 plants was-14.13‰.It means that harsh conditions have no effects on the nutrient resorption efficiency of plants in desert environments,but enhance their water use efficiency.(2)There were differences in N,P,K resorption efficiency andδ13C of plant leaves at community level in different habitats.The results of nutrient resorption efficiency for N and P showed:saline meadow>gravel desert>desert,while that of K was:saline meadow>desert>gravel desert.δ13C:gravel desert>desert>saline meadow,and there is significant difference among three habitats.All sites studied could be divided into saline and non-saline habitats by analysing the soil properties,resorption efficiency of N,P,K andδ13C in community level.All the above results suggested that the selection and filterability of sepcific habitat for nutrient resorption efficiency and water use efficiency.(3)Nutrient resorption efficiency andδ13C in different community are determined by the edificator.The result of nutrient resorption efficiency showed that N(64.57%)and K resorption efficiency(53.49%)in Form.Reaumuria songarica were the highest,and the P resorption efficiency in Form.Kalidium foliatum is the highest(53.49%),while resorption efficiency of P and K in Form.Oxytropis aci-phylla was the lowest.Forδ13C,it was the lowest(-26.49‰)

Mots clés : Arid area; different habitats; desert plants; nutrient resorption; δ13C;

Présentation (CNKI)

Page publiée le 19 novembre 2019