不同放牧方式下荒漠草原植物补偿性生长研究

Study on Plant Compensatory Growth under Different Grazing Ways in Desert Steppe

2005-2006年研究了不同放牧方式下荒漠草原植物赖草（Leymus secalinus）、长芒草（Stipa bungeana）、糙隐子草（Cleistogenes squarrosa）、牛枝子（Lespedeza potanimii）4种主要饲用植物种群的地上净初级生长量。结果发现当放牧强度为0．75只／hm^2绵羊时，荒漠草原植物和主要饲用植物种群在不同放牧方式下表现为不同的补偿性生长，增加轮牧分区有利于超补偿或等补偿生长的发生。补偿性生长受生长季降雨量和植物生物学特点的影响。合理的放牧方式有利于草地生产力的增加，从而有助于草地的持续利用。

Aboveground net primary production of plant and four main forage plant populations named Leymus secalinus , Stipa bungeana , Cleistogenes squarrosa and Lespedeza potanimii were studied under different grazing ways in desert steppe during 2005 and 2006. The results showed that plant and main forage plant populations in desert steppe behaved different compensatory growths under different grazing ways when grazing intensity was 0.75 sheep/hm^2. Increasing blocks of rotational grazing was beneficial to represent over-compensatory or equal-compensatory growth for plant and four main forage plant populations. Plant compensatory growth was influenced by rainfall in growth season and biologic characteristics of plant. Reasonable grazing way would help to increase desert steppe productivity, and would be in favor of constant utilization for desert steppe.