香根草在红壤丘陵上的应用

本文根据我省香根草试验结果，针对我国南方红壤丘陵水土流失严重、生态环境退化等问题，从香根草适应能力强、生长成篱速度快、生物量大等优势及其显著水土保持、稳定水热状况、改善生态环境、培肥改土效果等方面分析，认为香根草的种植是促进红壤丘陵农业持续发展切实可行的有效措施。

Application of Vetiver Grass in the Hilly Red Soil Region

Soil erosion and soil degradation, which leads to declines in soil fertility and crop yield, is one of the principal obstacles to sustainable agricultural development in the hilly red soil region of southern China. Surveys and studies in Jiangxi province show that vetiver grass contour hedgerows offer one practical technology to address this problem. The results indicate that : 1. Vigorous hedgerows of vetiver grass with their dense root system formed 1 or 2 years after the grass was planted. They constituted a biological soil moisture retention system effective for soil erosion control by fixing soil particles and conserving soil moisture. 2. In fields with a vetiver hedgerow arrangement, in dry and high temperature conditions, air and soil temperature decreased and surface water evaporation decreased while humidity increased. In cold winter adequate temperature could be maintained and frost damage could be minimized as the convection and diffusion of cold air could be buffered by the hedgerows. 3. Large quantities of biomass were generated with the quick tillering of vetiver grass. As a result an increased amount of organic matter accumulated in the soils as a large quantity of vetiver materials, naturally decayed or artificially applied, entered the soil layers. 4. Vetiver grass does not threaten the growth of crop as most weeds do because they develop without rhizomes or creeping stems and do not propagate by seeds. Therefor, they may be planted in orchards and crop fields using appropriate designs and forming sustainable multilayered integrated agricultural systems such as fruit-grass or crop-grass combinations.