| The characteristics of C,N,P and stoichiometry of organisms and their environment can reveal the laws of interaction between different elements in plant growth,which is one of the important research methods in the field of ecology.In this paper,the natural secondary forests of Phoebe bournei in different stages of the Mingyueshan Forest Farm in Jiangxi Province were studied.The renewal stages ?,?,? and ? were the initial,early,middle and late stages of renewal.By comparing and analyzing the contents of C,N and P in soils,fine roots and leaves in different months,and their measurement ratios,the C,N,P stoichiometry,seasonal changes,and soil-fine root-leaf were studied.Correlation between C,N,P stoichiometric characteristics.In order to provide a theoretical basis for the restoration,reconstruction and management of natural forest resources.The main results are as follows:(1)The annual average C and N and P stoichiometry of the natural secondary forest soils of Phoebe bournei were 13.15,1.27,0.38 g·Kg-1 and 10.09,39.19 and 3.67,respectively.The organic C and N contents in different stages were ?>.?>?>?,P is?>?>?>?,the decomposition rate of organic matter and the ability of mineralization to release P are ?>?>?>?;the content of organic C and N in different soil layers is on the soil profile.The"inverted pyramid" graphic features are presented,while the P content presents the "cylinder" graphic feature;in the seasonal dynamics,the lowest values of soil organic C,N,and P in the four update stages appear in July;two-way analysis of variance is obtained.The surface season of the surface soil is greater than the renewal stage,while the deep soil is the opposite.(2)The contents of C,N and P in fine roots of different update stages were not much different.The annual average values were 532.89,8.54 and 0.87g·Kg-1 respectively.There was no significant difference in organic C in each update stage,and the total N content was significantly higher in stage ?.In the other three stages(p<0.05),the total P content update stage ? was significantly higher than the other three stages(p<0.05),and the N:P ratio update stage IV was significantly lower than the other three stages(p<0.05);In the seasonal dynamics,the highest value of fine root organic C in stages ? and ? appeared in January,while the highest value of fine root organic C in the renewed stage ? and ? appeared in October,and the total N and total P content of fine roots were in the season.There was no significant difference in the dynamic update phase.Through the correlation analysis,the fine roots of the four finer stages showed a significant negative correlation between all N and C:N(p<0.01),and the performance of N:P was positive.Correlation;all P and C:P,N:P showed a negative correlation.(3)The average annual and stoichiometric ratios of C,N and P of fine roots of Phoebe boumei were 532.89,8.54,0.87 g·Kg-1 and 65.01,660.21 and 10.56,respectively.There was no significant difference in C content in each update stage,which showed that the update stage ?>?I>?>?;the total N content showed the update stage ?>?>?>?,and the total P content showed the update stage ?>?>?>?.In the different seasons,the C content of stage ? and ? was the highest in January,while the stage ? and ? were the highest in October;there was no obvious seasonal change in all N;the whole P update stage ? and ? showed the highest value in April,update stage ? And ? showed the highest in January and October respectively;C:N ratio stage ?,?,? showed the maximum in July,stage ? appeared in October;C:P and N:P ratio stage ? and ? in 7 The month shows the maximum and Phases ? and ? show the maximum in October.(4)There was a significant positive correlation between soil organic C and leaf C in the renewal stage ?(p<0.01);soil total N was significantly positively correlated with the total P of the stage ? and ? in the regeneration stage(p<0.01),and the leaf N:P The performance was significantly negatively correlated(p<0.01);the correlation between soil P element and fine root renewal stage ? and ? content and ecological stoichiometry was significant,and organic C showed significant positive correlation with fine root renewal stage ? and ? all N.(p<0.05). |
PDF Full Text Request