| In this study,the dominant species of Poyang Lake Wetland,carex cinerascens,was selected as the research object.This paper discussed the dynamic change and distribution characteristics of carex cinerascens'community biomass,the relationships between root and leaves and their features,the relationships between biomass and separate elements as well as the relationships among the main characters by comparing over-ground traits such as the content of carbon?c?,nitrogen?N?and phosphorus?P?in the leaves,biomass,leaf area,specific leaf area,or plant height and subsurface traits,for example,specific root length with different root-system,tissue density,branching ratio,branching intensity or the underground properties of C,N&P.It is of great significance to clarify the allocation and utilization of resources in the growth process of wetland plants,as well as to understand the interrelationship between different plant characteristics.The results are as the following:?1?The above-ground and underground biomass changes of the genus Carex sinensis were 315.56-712.01 g·m-2,1130.56-2075.41 g·m-2,and the seasonal differences were significant?P<0.05?.?2?The range of total C,all N and total P content of the leaves of A.serrata was401.60-445.96 mg·g-1,14.94-34.33 mg·g-1,0.24-3.79 mg·g-1.The range of total C,all N and total P content per unit area was 24.99-31.70 g·m-2,0.93-2.47 g·m-2,0.017-0.272 g·m-2.?3?The range of primary root,secondary root and tertiary root diameter of Aedes genus was 0.17-0.26 mm,0.22-0.40 mm,0.51-0.68 mm,respectively;primary root,secondary root and tertiary The ratio of root to root length is 39.11-445.09 m·g-1,11.65-197.69 m·g-1,4.81-42.54 m·g-1,respectively.Root tissue density is in primary root,secondary root and tertiary root.The range of variation is 0.046-0.833 g·cm-3,0.022-0.968 g·cm-3,0.191-0.703 g·cm-3,and the range of branching ratio of primary root and secondary root is 0.75-3.04 respectively.0.42-4.52;the branching intensity of the first and second roots varies from 9.20 to 27.98/cm-1 and 7.25 to 36.53/cm-1respectively.?4?There was a significant correlation between the total N and total P content in the leaves of A.cinerea?P<0.01?.There was also a significant positive correlation between the total N and the total P content in the underground roots?P<0.01?.There was a significant correlation between the total C content of the leaves and the third-order root tissue density,secondary root branching ratio and branching strength?P<0.05?,and there was no correlation with other root traits?P>0.05?..There was no correlation between the total N content of the leaves and the total N content of the first and second roots,and the root length,tissue density,branching ratio and branching strength of the roots?P>0.05?.There was a very significant positive correlation between the total N content of the roots?P<0.01?.There was no correlation between total P content in leaves and total P content,tissue density,specific root length,branching ratio,branching strength and N:P of different root grades?P>0.05?.?5?There was a significant negative correlation between biomass and total N in leaves?P<0.01?,and there was a significant correlation?P<0.05?with total C content in leaves.Correlation?P>0.05?;there was a significant correlation between aboveground biomass and tertiary root N:P?P<0.05?,no correlation with root length and root tissue density of other roots?P>0.05?.).There was no significant correlation between the biomass of the undergrowth and the total C and P content of the leaves?P>0.05?,but a significant positive correlation with the total N content of the leaves?P<0.01?.There was a significant correlation between roots and root length?P<0.05?,and there was no correlation between root length,root tissue density and N:P of other roots?P>0.05?. |
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