周山森林公园不同林木生长对土壤氮的动态影响

在河南洛阳周山森林公园,2009年不同时期对紫叶李(Prunus cerasifera Ehrhart)和塔柏(Sabina chinensis)不同立地林地土壤全氮含量进行了测定,结果表明:紫叶李林地土壤中全氮的含量高于塔柏林地含量,无论平地坡地皆是如此。在不同月份或季节,前者全氮的含量高于后者,且波动幅度较后者大。同时土壤中全氮含量也受地形的影响,平地的全氮含量高于坡地。不同深度,0~10cm土层,平地和坡地的差距最大,随着土层深度的增加,差距逐渐缩小,20~30cm土层,已无明显差异。总体来看,紫叶李平地和坡地土壤氮元素的含量变化要比塔柏平地和坡地土壤氮元素含量变化显著。

Dynamic effect of different tree species on soil nitrogen in Zhoushan forest park

In different seasons at Zhoushan Forest Park of Luoyang,Henan Province,total nitrogen content of soil on two different woodlands of Purple Leaf Plum（Prunus cerasifera Ehrhart）and Taber（Sabina chinensis）had been studied.Results showed that：total nitrogen of Purple Soil is higher than total nitrogen of Tabe soil,regardless of different terrain.In different months or seasons,total nitrogen content of the former is higher than the latter,and the volatility is greater than the latter.Simultaneously total nitrogen in soil is also affected by topography,and total nitrogen content of flat is higher than slope,In the 0-10cm soil layer,the largest gap between the plains and slopes.with the increase of soil depth,the gap is gradually narrowing,And in the 20-30cm soil layer,it has no significant difference.Overall,plains and slopes of Plum of nitrogen content in soil changes more significantly than plains and slopes of Taber of nitrogen content in soil.In addition,tree growth is closely related to precipitation,temperature and other climatic factors,so they also reflect the seasonal changes in the difference of total nitrogen content in the soil.The results show that：the lowest total nitrogen content of soil in summer,autumn,winter and spring up.Finally,along with the increase of depth,two trees of total nitrogen in the soil is Gradually decreased.Dynamic effects of different tree species on soil nitrogen is mainly in 0-20cm soil layer.To sum up：different trees on soil nitrogen uptake and utilization are different,and are also closely related to seasons and different location.