Effects of Drought Stress on the Growth Biomass and C,N,and P Stoichiometric Characteristics of Fraxinus malacophylla Seedlings
[Objective]Our aim is to investigate the adaptability of F.malacophylla seedling to various drought environments by examining the impacts of different degrees of drought stress on the growth,bio-mass distribution patterns,as well as the accumulation and distribution of carbon(C),nitrogen(N)and phosphorus(P)in different organs of F.malacophylla seedlings.[Method]We used 1-year-old of F.malacophylla seedlings as experimental materials and established four drought treatments,including con-trol(CK),mild drought stress(LS),moderate drought stress(MS),and severe drought stress(SS).The growth,biomass,and C,N and P contents in various organs of the F.malacophylla seedlings were measured to investigate the effects of drought stress on their biomass allocation patterns and the stoichio-metric characteristics of C,N and P.[Result]The growth in height and ground diameter of F.mala-cophylla seedlings significantly decreased(P<0.05)with increasing drought stress.Additionally,the bio-mass of leaves,stems,and roots,along with the total biomass,and the proportion of biomass of leaves,stems,and roots,as well as the root-to-crown ratio,decreased with increasing drought stress.Similarly,the contents of C,N and P of F.malacophylla seedlings exhibited a decreasing trend with with drought stress.However,the C to N ratio of various organs and the C to P ratio of leaves and roots in the F.mala-cophylla seedlings exhibit a trend of initially decreasing,followed by increasing with the increase of drought stress.The N to P ratio of each organ in the F.malacophylla seedlings was lower than 14,sug-gesting that growth was primarily limited by N.[Conclusion]These findings indicate that the biomass and C,N and P stoichiometric characteristics of F.malacophylla seedlings respond differently to drought stress.Drought stress negatively impacts the growth and the accumulation of C,N and P in F.mala-cophylla seedlings,leading to a greater allocation of biomass underground.
NETL
NSTL
万方数据
维普
