保持沙地半固定状况是飞机播种灌草复壮更新的关键措施

THE KEY MEASURE FOR RESTORING AIR-SOWED SHRUBS AND GRASSES——KEEPING SANDY LAND SEMIFIXED

本文主要依据作者在内蒙地区沙地飞播的实践与研究,从植物生长过程与沙地水分关系及沙地表层结皮对沙地水分的不利影响上,论述了保持沙地半固定状况的合理性。

On drift sand and desertified and degraded grazing land in steppe or desert steppe,air sowing,as an effective method for controlling sand and deve- loping pasture, has achieved success. However, serious degeneration occurs in local parts of air-sowed area. The main reasons are two,one is the brea- dcrust on sandy surface that intercepts rainfall so that hinders rain wa- ter to seep into the ground, the other is that the shrubs are so dense as to consump too many water and worsen the sand water condition. The key measure to convert the degraded condition is maintaining the sandy land as semifixed.