Eliengerasia Godliving Koka , Alfred Kihanju Chitiki , Ismail S․ Selemani , Urs Schaffner , Charles Joseph Kilawe
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引用次数: 0
摘要
推迟放牧制度被视为一种放牧管理策略,有助于提高牧场的生产力和健康水平。然而,东非干旱地区的经验证据有限。本研究调查了延迟放牧制度对坦桑尼亚北部牧场生产力和健康的影响。研究人员在延缓放牧 8 年的牧场中随机选取了 45 个矩形样地(20 × 50 米),对地上植被生物量、植物物种组成和多样性以及土壤有机碳(SOC)进行了评估。作为对照,对邻近的持续放牧管理牧场进行了评估。采用独立 t 检验法进行统计分析,以确定两种放牧制度在植被生物量、SOC、物种丰度和多样性方面的差异。此外,还采用多变量一般线性模型(MvGLM)检验放牧制度是否影响植被组成。结果显示,与连续放牧的牧场相比,延迟放牧的牧场草本生物量、SOC、灌木(胸径≥5厘米和10厘米)和乔木(胸径≥10厘米)的丰富度更高。此外,连续放牧的牧场受到非本地植物物种的入侵更严重,尤其是入侵性杂草糙叶桉和菖蒲。研究结果表明,与连续放牧的牧场相比,在延缓放牧制度下管理的牧场产量更高、更健康。
Effects of Deferred Grazing Regime on Rangeland Productivity and Health: A Case Study of Simanjiro District in Northern Tanzania
Deferred grazing regimes are viewed as a grazing management strategy that can aid in the enhancement of rangeland productivity and health. However, there is limited empirical evidence from drylands of East Africa. This study investigated the effects of deferred grazing regime on rangeland productivity and health in northern Tanzania. Aboveground vegetation biomass, plant species composition and diversity, as well as soil organic carbon (SOC) were assessed in 45 rectangular sample plots (20 × 50 m) which were randomly distributed in a rangeland subjected to deferred grazing for 8 years. For control adjacent rangelands subjected to continuous grazing management were evaluated. Statistical analyses were performed using an independent t-test to discern differences in vegetation biomass, SOC, species abundance and diversity between the two grazing regimes. Additionally, Multivariate General Linear Model (MvGLM) were performed to test if grazing system affected vegetation composition. Results revealed that the herbaceous biomass, SOC, and the richness of shrubs (with a diameter at breast height, or DBH ≥5 cm and <10 cm) and trees (DBH ≥10 cm) were higher in rangeland subjected to deferred grazing, in comparison to the rangeland under continuous grazing regime. Moreover, rangeland under continuous grazing was found to be more heavily invaded by non-native plant species, notably the invasive weeds Prosopis juliflora and Calotropis procera. The findings of this study suggest that rangelands in the study area can be both more productive and healthier when managed under a deferred grazing regime, as compared to continuously grazing rangeland.
期刊介绍:
Rangeland Ecology & Management publishes all topics-including ecology, management, socioeconomic and policy-pertaining to global rangelands. The journal''s mission is to inform academics, ecosystem managers and policy makers of science-based information to promote sound rangeland stewardship. Author submissions are published in five manuscript categories: original research papers, high-profile forum topics, concept syntheses, as well as research and technical notes.
Rangelands represent approximately 50% of the Earth''s land area and provision multiple ecosystem services for large human populations. This expansive and diverse land area functions as coupled human-ecological systems. Knowledge of both social and biophysical system components and their interactions represent the foundation for informed rangeland stewardship. Rangeland Ecology & Management uniquely integrates information from multiple system components to address current and pending challenges confronting global rangelands.