小叶锦鸡儿对牲畜啃食补偿效应的模拟试验研究

Simulated experiment of growth compensation of Caragana microphyllato cattle grazing on sandy land

采用人工模拟和对比研究的方法,研究了沙地天然和人工小叶锦鸡儿被牲畜啃食后,枝条在生长上的反应。结果表明,小叶锦鸡儿对牲畜的啃食具有一定程度的补偿和超补偿能力,当啃食程度较轻时,可促进枝条的生长,增加其可食部分的生物量,即出现超补偿效应;随着啃食强度的增加,其补偿能力逐渐降低;密度较大的人工小叶锦鸡儿对牲畜啃食的补偿能力明显低于天然植株。建立了小叶锦鸡儿补偿效应模型,对补偿效应机制进行了探讨。

Artificial simulation and contrast research methods were used to assess branch growth response to cattle grazing of Caragana microphylla naturally occurring and planted on sandy land. The results showed that C. microphylla had certain levels of compensation and overcompensation abilities with cattle grazing. Light grazing resulted in faster branch growth, increasing its edible biomass. With increase in grazing intensity, its compensation ability gradually declined. The compensation ability of artificially grown C. microphylla with quite high density was much lower than naturally occurring plants. In this paper, compensation response models for grazing of C. microphylla have been given and the compensation response mechanisms discussed.