红壤丘陵山区人为活动对植被恢复影响研究

利用在湘南丘陵山区的2个长期定位试验，研究该地区自然植被恢复的情况。结果表明：频繁刈割不仅使植物的生物量逐年下降，植物种类减少，特别是抑制木本植物的生长。对该地区植被自然恢复过程中的白茅草问题进行的针对性研究证明，施肥可使白茅草过度繁殖而死亡。频繁刈割地力不断耗竭，白茅草生物量锐减，特别是在施氮肥的条件下生长最差。

Studyon Effects of Human Activities on Rehabilitation of Vegetation on Red Soils in Hilly Areas

Based on the two long term experiments on red soil in hilly areas in the southern part of Hunan Province, a study on the rehabilitation of natural vegetation in this area has been carried out. The results showed that when the vegetation were cut frequently, not only the biomass and the component species of the vegetation decreased year by year, but the growth of shrub was inhibited, for example, in 1991 in the treatment of annual cutting, the biomass of vegetation decreased from 90.2kg/plot to 45.0kg/plot. The species of the vegetation decreased from 15 to 4. And the proportion of the xylophyta biomass also decreased from 17% to 0.9%. As for Imparata cylindrica var. major , during the process of restoration of natural vegetation, the soil fertility deteriorated and the biomass of this herb decreased sharply, especially in the condition of application of N fertilizer, the situation of growth was worst.