Dissertation > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology

The Effects of Light on the Nutrient Absorption and Partitioning of Abies Holophylla Seedlings

Author LiuLiFang
Tutor XuChengYang
School Beijing Forestry University
Course Forest cultivation
Keywords Abies holophylla Seedling light nutrient absorption nutrientassignement nutrient utilization
CLC S718.5
Type Master's thesis
Year 2012
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Abies (Abies holophylla Maxim), also known as white pine is a cold-temperate broad-leaved Korean pine forest in Northeast Jianqun species, is also one of the top-associated species. Due to the long-term high-intensity harvesting, excellent natural the Abies resources will carry the amount of a sharp decline in how to update measures to restore its resources for the production urgent to solve the problem. Therefore, the natural regeneration of Abies seedlings materials, typical sample survey methods to update the individual on the ground from the light environment on Abies, underground part growth, nutrient content and nutrient use efficiency point of view to carry out research.The results of this study show that:(1) Abies natural regeneration of seedlings grow in the crown under the most productive, the appropriate shade is conducive to the growth of Abies seedlings; However, the the Abies update the requirements of the individual light conditions increased with increasing age;(2) Different light environment on the spatial heterogeneity of soil organic matter content and soil nutrient was not obvious differences in soil nutrient spatial heterogeneity is mainly due to the spatial level of the soil caused;(3) In different light conditions, the nutrient concentration of the organs of the seedling age of Abies seedlings did not differ significantly, mainly N, P, K and Mg concentrations in the7-8years old is higher than9,10age, while Ca performancethe opposite;(4)Abies saplings on the analysis of the accumulation of nutrients, the overall obtained gap light conditions than the other two light environments there is a high performance single plant of the K and N accumulation than P, Mg and Ca is much higher.and in Abies each organization in the allocation of the elements generally show similar trends, namely:leaf> branch> root, but with the reduction of the accumulation and utilization efficiency instead of increasing. In different light conditions, Abies monoclonal N, P, Ca, Mg, showing a straight linear relationship between efficiency and root to shoot ratio. In addition, soil N, P, K, Ca and Mg content of on Abies nutrient absorption with interaction effects, the nutrients in the soil, the overall table for the highest K content, followed by Mg, N and Ca or less. P; Abies each nutrient use efficiency to the contrary.

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