Leymus Chinensis Grassland Soil - Grass - Animal Trace Elements Study

This paper focused on soil-grass-animal of typical Leymus chinense community in the Songnen grassland. Distribution dynamics of trace elements in soil-plant-animal system was completed through field and laboratory experiments during the period from 2002 to 2003. The results were as follows:1. The concentration of total copper in soil was very low, and the content of available copper and the concentration of copper in Leymus chinensis and sheep were normal. Total and available copper had the decreasing trend down the soil profile (except 0-1 cm layer) in all stages of growing season. The available copper had positive correlation with organic matter but the negative correlation with pH.The dynamic of average concentration of total copper showed "V" curve in each month of the growth season, in which the lowest happened in July. The average concentration of available copper was similar to total copper from May to August, but gradually decreased after august. The concentration of copper in organs and litter of liymus chinensis changed prodigiously. The trend on the whole is root>rhizome>stem>leaf> litter. The dynamic of concentration of copper in leaf and stem showed a fluctuant curve of falling. The dynamic of concentration of copper in roots, rhizomes and litter showed "V" curve in stages of growing season.The order of concentration of copper in sheep from high to low was: liver> blood> wool >mutton >bone. The seasonal dynamic of copper in wool from May to October showed tendency like parabola with the highest in August. Moreover, the younger had the higher concentration of copper in wool and the concentration of cooper reduced with the increase of age. The soil of A layer had stronger capacity of enriching available copper. There is high temperature and humid in the period from June to July so that there is high activity of microorganism, which can make the decomposition increased. The average activity of copper was 14.64% with the highest in the June and the lowest in the October. The copper enriched was 11.18 times in roots of Leymuschinensis more than in the soil. The dynamic of enrichment of copper showed "V" curve. The transfer intensity from underground to aboveground of Leymus chinensis was 68.9%. Because copper was utilized repeatedly, the transfer intensity from aboveground to litter of Leymus chinensis was low and just was 58.8%.2. The concentration of total manganese in soil, Leymus chinensis and codetta was scarcity in this area, although the concentration of available manganese in the soil was normal. Content of total and available Mn in the soil profile decreased from up to down in growth season. Available manganese had positive correlation with organic matter while negative correlation with pH. The dynmic of month average concentration of total Mn showed the curve of "V" in the growth season with the lowest happened in July. Dynamics of average concentration of available Mn was similar to that of total Mn from May to August. Average Mn content reduced after August. The manganese content in organs and litter changed prodigiously. The trend on the whole was root>rhizome> litter >leaf> stem. The order of Mn in sheep was bone> wool> liver> blood> mutton. The seasonal dynamic of Mn content in the wood of sheep showed the trend like parabola and the highest happened in September.The concentration of manganese in the sheep population varied individually and had no relationship with age. The soil of A layer had stronger capacity of enriching available manganese. The average activity of manganese was 13.78%. It rise from May to August, and decreased after August, till October it hit lowest. The manganese enriched in roots of Leymus chinensis was only 1.448 times as available manganese in the soil. The average transfer intensity from underground to aboveground of Leymus chinensis was 55.6%. Mn is an element of low transfer intensity in phloem, and is not easy to recycle. Few Mn in litter was transferred to the underground of Leymus chinensis. So the transfer intensity from aboveground to the litter of Leymus...