水土流失区马尾松垦复施肥与混交固氮植物措施对比分析

水土流失区马尾松“老头林”采用一般的垦复施肥措施，对促进马尾松生长有显著效果，但施肥作用只能持续3年左右。而采用混交固氮树种杨梅、胡枝子的措施，随着固氮植物固氮能力及生物生长量的增加，土壤养分状况、土壤结构等得到不断改善，马尾松高生长量也在逐步上升，效果十分显著，且作用持久。

Contrast Analysis on the Measures of Masson Pine Reclaim Fertilization & Mixed Nitrogen Fixation Vegetation

The general reclaim fertilization measures in the old forest of soil erosion area has the obvious effect on the growing of masson pine. However, the impact of fertilization will only last for about three years. Whereas, by adopting the measures of mixed planting the nitrogen fixed plants such as Chinese Waxmyrtle and Shrub Lespodeza, the soil nutrient and soil structure are continually improved followed with the increase of nitrogen fixation capacity and bio - growth volume of nitrogen fixed plants, and masson pine growing volume is also increased with obvious impact and supporting functions as well.