首页|High ecostoichiometric stability and accumulating SiO2 and NO3-as main physiological adaptive mechanisms for reed to adverse environments
High ecostoichiometric stability and accumulating SiO2 and NO3-as main physiological adaptive mechanisms for reed to adverse environments
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High ecostoichiometric stability and accumulating SiO2 and NO3-as main physiological adaptive mechanisms for reed to adverse environments
Previous studies have shown that nutrients accumulation played important roles in resisting to stress resistance of plants.Our study examined the ecostoichiometric internal stability(EIS)of nutrients accumulation and,concomitantly identified the main resistant regulating substances and their contributions to stress resistance of reed(Gramineae)in arid desert areas.Plants(digging method)and soil samples(quartering method))obtained from sand dune(SD),desert steppe(DP),interdune lowland(IL),saline meadow(SM)and wetland(W)habitats were brought back to the lab for nutrients analysis.Results indicated that soil nutrients differed obviously,while reed maintained relatively stable ratios of SiO2∶N,N∶K,and P∶K when the eco-environments changed in different habitats.Furthermore,reed exhibits common adaptive characteristics by mainly accumulating large amounts of SiO2(122.6-174.0 g/kg)and NO3-(166.1-216.6 g/kg),as well as moderate levels of soluble sugar(SS:24.0-55.0 g/kg),which are mainly stored in leaves for stress resistance.The contribution of ions to stress resistance was 80.03％-91.15％(with SiO2 and NO3- accounting for 54.91％-63.10％),whereas the contribution of solutes was only 8.85％-19.97％(with SS contributing to 5.14％-10.91％)in different habitats.These findings suggest that maintaining relatively high EIS,while still accumulating SiO2 and NO3-as main physiological reg-ulators might be an effective strategy for reed to positively respond to adverse habitats,which provide a strong theoretical basis and technical reference for searching useful methods for restoration and reconstruction of the degraded ecosystems in desert oasis regions.
Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Linze Inland River Basin Research Station,Chinese Ecosystem Research Network,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China
Minqin National Studies Station for Desert Steppe Ecosystem,Gansu Desert Control Research Institute,Wuwei,Gansu 733000,China
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