Comparative Study On Soil Properties In Different Size Forest Gaps In Broad-leaved Pinus Koriensis Forest Of Changbai Mountain

Forest gap is one of wide range interference phenomena in forest landscape pattern. It is the basic space-time dynamic unit in the study of forest population, community and landscape ecology. The generation of gap is the driving force of the maintenance and development of forest ecosystem which has changed the light and water and heat conditions of the forest community's microhabitat, providing places of seedlings updated. The study of gap can be in-depth understanding upgrades and dynamic evolution law of the forest eco-system, and provide a scientific basis for forest management, conservation of forest biological diversity.In this paper, through the comparative study on soil properties in different size forest gaps in broad-leaved Pinus koriensis Forest of Chang Bai Mountain, we analysis the law of different forest gaps in the temperature, moisture content, organic matter, pH value, N, P of the soil. Conclusions are as follows. As the gap area decreases, the soil surface temperature decreases, but in small changes in the deep soil temperature; soil water content increases, and diurnal variation of soil water content with the increase of gap size is firstly become larger then smaller; organic matter content increases in litter layer as the increase of gap size, while in the 0-10cm layer of soil showed a downward trend; soil N, P contents vary widely. The laws of different forest gap were not obvious. The soil spectral analysis gives further validation measurement.Then through the principal component analysis on different soil-gap nature, we find the dominant factors to identify the evolution of soil with gaps from big to small, Conclusions are as follows. Organic matter, soil moisture content in the early stages of development of the gap is very obvious, and in the latter part of the evolution nitrogen plays an important role, followed by P and the pH value. The gradual disappearance of the forest gap of the process of soil properties in general becomes more and more stable, close to feature of closed forest.