补播对天然割草场植被恢复效果的初步研究

目的]以退化的禾草+杂类草天然割草地为对象,探讨补播对其植被恢复效果的影响.方法]利用常规测定方法对补播天然割草地植被数量特征进行测定与分析.结果]补播豆科牧草后,退化的天然割草地质量得到明显改善,补播当年山地草甸、山地草甸草原草群中豆科牧草的比例分别提高17.14;、13.99;,且随着补播年限的增加,豆科牧草比例呈上升趋势;草地产量和草层高度均出现一定程度的提高,补播当年山地草甸、山地草甸草原草地的草层高度较对照分别提高了36.11;、32.36;,但草地总产量增减幅度不明显(P>0.05),且7月较8月草产量高、增产幅度大,可能与当年水热条件分配相关;补播对割草地原有植被各经济类群产量与高度的影响存在一定的差异性.结论]补播豆科牧草对天山北坡中山带退化天然割草地植被的恢复和草品质的提高均具有促进作用.

Primary Studies on the Resuming Effect of Reseeding on Vegetational Restoration of Natural Grassland

【Objective】In order to prevent the degraded of grasses and forbs natural cutting grassland,the resuming effect of reseeding on vegetation al restoration of natural cutting grassland under reseeding condition was discussed.【Method】Using routine method,the vegetation quantity characteristics of natural cutting grassland were measured and analysed after reseeding.【Result】The quality of degraded natural cutting grassland was significantly improved after reseeding,the proportion of legume forage occupied the total community yield in mountain meadow and meadow steppe was separately improved by 17.14 and 13.99 at the first reseeding year,and the proportion of legume forage increased with the increase of reseeding.There was an improvement on the yield and height of grassland community after reseeding.Compared with the control,the height of grassland community in mountain meadow and meadow steppe was separately increased by 36.11 percent and 32.36 at the first reseeding year,but there was no significant difference of the yield between reseeding grassland and the control(P>0.05),and the yield of reseeding grassland and the range of increasing yield in July were higher than that in August,which was probably correlated with the allocation of the rainfall and temperature.There was a certain discrepancy on the changes of the yield and height of the economic groups under reseeding.【Conclusion】Reseeding of legume had significant function on the resuming vegetation and the improvement of grass quality on degraded natural cutting grassland in the middle section of Northern slope of the Tianshan Mountains.