不同草地恢复措施对高寒草甸植物根系特征的影响

Effects of different range restorations on the root traits of vegetation in the alpine meadow

用根钻法就补播、围栏、施肥及综合处理等不同恢复措施对高寒草甸退化草地植被根系特征(根长密度、比根长和比根面积)的变化进行研究.结果表明:与对照相比,各种草地恢复措施对植物群落根长密度均有显著的促进作用;对植物群落比根长则有不同程度的影响,施肥和综合处理均对草地植物群落比根长有极显著的促进作用,而围栏、补播对植物群落比根长没有显著影响;不同草地恢复措施对比根面积的影响模式与对比根长的相反,围栏、补播、施肥及综合处理措施均使草地植物群落比根面积显著减少.此结果说明,由于各种恢复措施都不同程度地改变了草地土壤中的资源状况,因而使植物群落的根系特征也相应地发生了较大的变化.

By using soil coring method, the effects of different grassland restoration measures, such as resowing, fencing, fertilization and comprehensive treatments, on the root traits of vegetation, including root length density, specific root length and specific root area, were investigated in the alpine meadow. The results suggested that, compared with controls, all kinds of restoration measures promoted root length density significantly. As for specific root lengths, there were different effects. Fertilization and comprehensive treatments had notable effects, while fencing and recowing treatments had no clear effects. The performance of the specific root area, however, showed a different partner. Resowing, fencing, fertilization and comprehensive treatments all had negative effects on the index of the specific root area. These results indicated that as the soil resource is changed by the application of different restoration measures, the root traits of vegetation change accordingly.