不同修复措施对温性草原植被特征的影响

Effects of different restoration measures on vegetation characteristics of the temperate steppe

试验以温性草原为研究对象,通过实施免耕补播、喷灌补水+免耕补播、保水剂+免耕补播和飞播等4种修复措施,比较天然草原植被特征和土壤理化特性的改良效果,为退化草原保护修复提供参考。结果显示:与项目区外相比,免耕补播、喷灌补水+免耕补播、保水剂+免耕补播和飞播区的植物种数增加,植被平均高度提高2~5 cm,喷灌补水+免耕补播显著提升了植被盖度、地上生物量和土壤含水量(P<0.05)。研究表明,喷灌补水+免耕补播对地上植被特征和土壤涵水能力的修复效果最佳,保水剂+免耕补播次之,水分仍是限制退化草原生态修复效果的主要因素。

The study took temperate steppe as the research object,and compared the improvement effect of vegetation characteristics and soil physicochemical properties of natural grassland through the implementation of four restoration measures,such as no-tillage replenishment,water replenishment by sprinkler irrigation+no-tillage replenishment,water-retaining agent+no-tillage replenishment,and aerial seeding,so as to provide a reference for the protection and restoration of degraded grassland.The results showed as follows:Compared with the outside of the project area,the number of plant species in no-tillage replenishment,water replenishment by sprinkler irrigation+no-tillage replenishment,water-retaining agent+no-tillage replenishment,and aerial seeding areas increased,the average height of vegetation increased by 2~5 cm,and the vegetation coverage,above-ground biomass,and soil water content were significantly increased by swater-retaining agent+no-tillage replenishment(P<0.05).The results showed that water-retaining agent+no-tillage replenishment had the best effect on the restoration of above-ground vegetation characteristics and soil water holding capacity,followed by water-retaining agent+no-tillage replenishment.Water is still the main factor limiting the ecological restoration effect of degraded steppe.