The Study On The Short-term Effects Of Nitrogen Deposition On The Different Origin Larix Principis-rupprechtii Forest

In order to determine the effect of nitrogen deposition on different origin Larix principis-rupprechtii forest, the study was conducted in a natural(26a) and plantation(50a) forest of Larix principis-rupprechtii forest. By the whole field and many level understory application methods on two different origins were artificial nitrogen fertilizer test stand by measurement of soil organic carbon and nitrogen nutrient content, forest characteristics and current-year fine root coniferous forest characteristics, investigate the effects of nitrogen deposition on the different origins of larch forest soil, trees roots and needles. The results show that:1) a significant reduction in short-term nitrogen fertilizer nitrogen content of Young Plantation in North China larch soil, and significantly increases the nitrogen content of natural secondary forest in North China larch forest soil; short-term nitrogen fertilization on North Larch Sapling no significant effect on the organic carbon content of soil Plantation while in high nitrogen levels were significantly increased sedimentation of organic carbon content of natural secondary forest in North larch forest soils.2) short-term nitrogen fertilizer promotes different origins total root length under North Korean pine and deciduous root, root surface area, specific root length, root carbon content, increasing the nitrogen content of the root; where low levels of nitrogen deposition significantly increased the total fine root root length, root surface area, root nitrogen content and specific root length; settlement nitrogen levels were significantly increased root carbon content.3) low levels of nitrogen deposition in North China larch young forest plantations reduce the current-year needles plant leaf nitrogen content and leaf carbon content, leaf surface area, leaf length, leaf width and leaf area ratio, and high nitrogen levels increased sedimentation larch Sapling plantation pine needles when the nitrogen content of leaves, leaf carbon content; low levels of nitrogen deposition increases the natural secondary forest plants in North China larch needles when the nitrogen content of leaves, leaf width, and high nitrogen levels were significantly increased settlement in North larch natural secondary forest nitrogen content of plant leaves year needles, leaves the carbon content, root surface area, leaf length and width.