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本文系在海南岛尖峰岭半落叶季雨林带,对泛行的“刀耕火种”制进行对比观测阶段总结的一部分。根据三年观测结果,对地表迳流水的化学特征、变化规律以及森林和烧垦措施的影响等,作了初步的分析,论证了毁林开荒加剧了迳流水化学侵蚀的事实,为热带地区森林和土地资源的合理利用提供了参考依据。海南岛尖峰岭半落叶季雨林“刀耕火种”的生态后果,经过1979—1981年三年耕垦的对比观测,以地表迳流而言,“刀耕火种”地(简称林外)年平均迳流量为半落叶季雨林地(简称林内)的26倍;泥沙流失量为林地的588倍。随水土流失而产生的化学迁移和损失,相当明显。本文拟就此将三年的观测资料作一总结。
This paper is based on the semi-deciduous monsoon forest in Jianfengling, Hainan Island, and summarizes the comparative observation stage of Pan-line slash-and-burn farming system. Based on the three-year observation results, the chemical characteristics of the surface water flow, the changing rules and the impact of the forest and land reclamation measures were analyzed. The results show that the deforestation and wasteland aggravate the fact that the chemical erosion of the water flow is serious. And the rational use of land resources provide a reference. In the semi-deciduous rainforests of Jianfengling, Hainan Island, the ecological consequences of “slash-and-burn” were compared. After three years of land reclamation from 1979 to 1981, the annual mean 迳 flow in the “slash-and-burn” Deciduous monsoon forest (referred to as the forest) 26 times; sediment loss of 588 times the woodland. Chemical migration and loss caused by soil erosion are quite obvious. This article intends to make a summary of three years of observation data.