Stoichiometric characteristics of leaf,branch and root in Larix gmelinii in response to climate warming based on latitudinal transplantation
Aims Exploring the impact of climate warming on stoichiometric characteristics of trees is of significance for better understanding the response mechanism of trees to climate change.Methods In 2004,we conducted a common garden experiment by transplanting Larix gmelinii trees from four provenances to a common garden near the warm edge of this species'range in the Mao'ershan Ecological Station of China,in order to measure the concentrations of carbon(C),nitrogen(N)and phosphorus(P)in leaves of short branch,leaves of long branch,short branches,long branches,and fine roots at three diameter classes in response to warming.Important findings The C,N,and P concentrations in leaves of short branch and roots of all diameter classes,and the N and P concentrations in leaves of old branch significantly differed among provenances.The provenances at high latitude sites were characterized by lower C and N concentrations and higher P concentration compared to those at low latitude sites.Warming treatment significantly increased the C concentration in all organs(except root at 1-2 mm diameter),and also significantly increased the N concentration in leaves,long branches and roots＜1 mm diameter,and the P concentration in all organs(except short and long branches).The effect of warming on C and P concentrations decreased with the increasing warming,but increased for N concentration.The C∶N,C∶P and N∶P in all organs(except short and long branches)significantly varied with provenances.The provenances at high latitude sites had higher C∶N and lower C∶P and N∶P compared to those at low latitude sites.Warming treatment significantly decreased the C∶N,C∶P and N∶P in all organs except short and long branches.In summary,the stoichiometric characteristics had evident geographical variations in resource acquisition organs of leaves and roots of L.gmelinii.Warming treatment mainly alleviated the constraints on the demand for N and P in leaves and roots,and simultaneously reduced the C sequestration efficiency of N and P.The impact of climate warming on the stoichiometric characteristics of C and P elements decreased as the increasing warming,except N element.
NETL
NSTL
万方数据
