The Spatial And Temporal Stoichiometry Characteristics Of Machi- Lus Plantation Of Huitong

Ecological stoichiometry of plant and soil is an important indicator of forest ecosystem health. The elements of ecological stoichiometry studies to reveal the availability of nutrients and carbon, nitrogen, phosphorus and other elements of the circulation and balance mechanism has important significance. Huiton g wood strategic reserve Machilus plantation base is a composed of Machilus young Plantation ecosystem in fir plantation forest transformation has not formed. In order to understand and guide the Machilus plantation management. This article in view of soil, Machilus and shrub in the Machilus young forest ecological system, and through the soil, Machilus leaves and shrub grass C, N, P content is determined. Comprehensive analysis of the different position of slope soil and season-al soil, Machilus leaves, shrub grass content and stoichiometric ratio characteristics, to determine the nutrient limiting conditions the Machilus plantation Machilus growth, and reveal the synergistic relationship between the forest soil, Machilus and shrub grass in ecosystem. The following conclusions were drawn through research.(1) The organic C content in soil change with the position of slope for the per-formance of the middle-slope> upper-slope> lower-slope, and the differ-ence between each slope position was significantly. But the change of total N and to-tal P content is not significant. The content changes of total N and organic C is same. The total P content with slope position changes for lower-slope> middle-slope> upper-slope. The C:N and C:P ratio changes with the change of slope with the same of total P content, and the ratio of N:P had no obvious change. With the increase in soil soil organic C, total N and total P content decrease, the Change of organic C and total N content is significantly. The average value of soil N:P is 1.59. The correlation analysis showed N content and N:P ratio in soil were positively cor-related. So N:P is mainly controlled by the total N content, and lower than other studies of the N:P, the experiment shows that Machilus young forest soil N deficien-cy.(2) The soil C, N, P contents in different seasons is significantly. Influence of soil nutrient content by the season, the performance for the winter> autumn > spring> summer. The C:N, C:P, N:P in different seasons showed significant dif-ference. The ratio of C:N and C:P is mainly controlled by the organic C content, and therelationship with the content of total N and total P was not obvious. The P ele- ment in every season were relatively stable, so N:P and N content have the same change.(3) The organic C content of Machilus leaves in different seasons was greater variability, and it’s content was significantly higher than other seasons in April. The variability of the smaller total N content of leaves, the total P content in April and October was significantly lower than that in July. Total P content of leaf variability is very small, the content of total P content in July also have significant differences with the other month. On the basis of Machilus leaf N, P contents and N:P quality than can be inferred from theplant by nutrient limitation status. Because N, P mass ratio is less than 14, plant growth is mainly limited by N.(4) The C, N, P content and C:N, C:P, N:P of shrub have significant difference in different seasons. And shrub aboveground part and underground part in the same season there was a big difference. The C, N, P content and stoichiometric ratio of each part shrub also exists obvious difference in different season. The shrub of aboveground part were negatively significant correlation between total P and C:P, N: P, there was significant positive correlation between N:P and C:P. The underground part of shrub total N was significant negative correlations with C:N, but compared with N:P had significantly positive correlation. The aboveground part of shrub total N was significant negative correlations with C:N, and compared with N:P had signifi-cantly positive correlation.The N:P and total N content were closely related, were af-fected by changes in total N content and change.(5) On soil, Machilus leaves and shrub grass makes the Pearson correlation anal-ysis found that element content of different slope layer soil and each element ratio of Machilus leaves did not change because the slope layer showed a significant correla-tion. It is found that N:P of aboveground part of shrub and the upper-slope portion of the soil had significant positive correlation, also has a significant positive correla-tion with the organic C and total N content in soil middle-slope. The N:P of above-ground part of shrub and the total N content of lower-slope soil significantly positive correlation, also significantly positive correlation with organic C and total P content of upper-slop of soil. The total P content in the soil of middle slope and underground part of shrub of N:P significant positive correlation. The organic C content of Machilus leaves and underground part of shrub of C:N was positively related. The C:N of Machilus leaves and total N content of aboverground part of shrub had sig-nificant positive correlation. There was was significantly positive correlation between the C:P of Machilus leaves with total N and total P content of aboverground part of shrub. The C:P of Machilus leaves with shrub underground part C:N and the abover-ground part of the C:P showed a significant negative correlation. This can be seen, the relationship between competition exists Machilus leaves and shrub N:P, so the shrub growth vigorous growth will restrain the Machilus. In addition, the other did not show a strong correlation, but the overall positive correlationis more than negative correlation.(6) Through comprehensive analysis spatial and temporal characteristics of soil, Machilus leaves and shrub C, N, P content and chemical metrology. We found that N may become a restrictive factor in conjunction with the plant Machilus planta-tion ecosystem growth, and also found in the ecological system of Machilus and shrub grass is in a competitive position. The result of the research has an important signifi-cance for guiding Machilus plantation management and forest sustainable develop-ment, to provide the scientific basis for reasonable utilization of mountain land. Pro-vide the basis for the effective utilization and management of soil nutrients in this re-gion and similar types of this area area. Provide relevant data support for the con-struction of strategic reserve base in the national construction.