围栏封育在呼伦贝尔沙化草地植被恢复中的作用

 为给沙化草地植被恢复提供理论依据,在内蒙古呼伦贝尔沙化草地,通过测定围封不同年限(1、4、7年)沙化草地群落的特征值,并与未围封地段作对照,就围栏封育对沙化草地植被特征的影响进行了深入分析,结果表明:对沙化草地实施围栏封育,群落组成发生了规律性变化,随着围封年限的增加,退化指示植物所占比例逐渐降低,建群种及一些适口性较好的优良牧草所占比例逐渐增加,另外,围栏封育还可使草地植被盖度、平均高度、草群密度、地上生物量和土壤草根含量大幅度增加。

Effects of enclosure on vegetations recovery in desertified grassland in Hulunbeir

In order to supply theoretical basis for closure on vegetation characteristics in desertified vegetation recovery of desertified grassland, the effects of engrassland have been deeply analyzed by measuring characteristics values of desertified grassland communities which are enclosed for 1 year, 4 years and 7 years in Hulunbeir desertified grassland and contrasting with the unenclosed. The results show that community composition has varied regularly after enclosure and the proportion of indicator plant of deteriorated grassland has gradually decreased and the proportion of constructive species and some better palatable species has increased with the enclosing time increasing. In addition, enclosure can greatly increase vegetation coverage, mean height, grass community density, ground biomass and soil turf contents on desertified grassland.