波动性生态脆弱带的特征

THE NATURE OF THE FLUCTUATING ECOTONE

波动性生态脆弱带是生态脆弱带的基本类型之一，跃变性是波动性的实质，降水的高变率与人类活动的保守性、稳定性的尖锐矛盾是形成脆弱的主要原因。牧草、粮食的放大性是对降水波动性的进一步体现，波动性是对农林牧土地利用结构，经济水平，人口超载状况的综合反映，是度量脆弱度的实用指标之一。

The Fluctuating is a major type of the Ecotone as Boundary Ecotone. Jump change is its nature. The fluctuating of land productive forces is a scientific and practical index to weakness. High abruptness of climate change and conservatism of Man make up main contradiction between Man land relation and basic cause for the weak. The amplification which means that the change for yield of grass and food is much larger than that of rain sharpens.