沿江丘陵区海拔高度与采矿活动对土壤碱解氮含量的影响

目的]探讨丘陵海拔变化和采矿活动对沿江丘陵区荻港镇土壤碱解氮含量的的影响。方法]在对样区样点土壤碱解氮含量分布特征研究的基础上,比较随海拔高度变化和采矿活动的进行所带来的在不同样带土壤碱解氮含量的变化。结果]随海拔的升高,土壤碱解氮含量降低,并且不同土地利用方式下土壤碱解氮含量存在很大的差异,沿江丘陵区原生土壤碱解氮呈Ⅱ级水平,被开采和废弃的矿区却为Ⅴ级水平。结论]不同土地利用方式下植被覆盖率与丘陵区土壤养分含量呈正相关。

Effects of Altitude and Mining Activities on Alkali-hydrolyzable Nitrogen Content in Low Hill Lands along Yangtze River

Objective]The effects of hills elevation changes and mining activities on soil nitrogen content of the alkali-hydrolyzable nitrogen in hilly area of Digang Town were studied.Method] The distribution of nitrogen was studied in the sample area.Soil alkali-hydrolyzable nitrogen brought by altitude change and mining activities were contrasted.Result] With the increase of the altitude,soil alkali-hydrolyzable nitrogen content decreased.Under different land utilization,the contents of soil alkali-hydrolyzable nitrogen had big difference.Alkali-hydronitrogen in native soil along hilly area reached Ⅱlevel,and that in mined and abandoned mines reached Ⅴ level.Conclusion]Under different land utilization,there was a positive relationship between alkali-hydrolyzable nitrogen content and vegetation coverage in hilly area.