探索肯尼亚Laikipia牧场开放放牧系统中土壤特性的分布

IF 1.9 4区 农林科学 Q3 ENVIRONMENTAL SCIENCES Arid Land Research and Management Pub Date : 2022-02-15 DOI:10.1080/15324982.2022.2039976
H. Kamiri, Daisy Mutuku, J. Ndufa, Stephen M. Kiama
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引用次数: 0

摘要

肯尼亚的Laikipia牧场是最具生产力的生态系统之一,但人们担心传统的自由放牧制度可能会加速土壤和植被的退化。本文研究了莱基皮亚县伊尔莫提奥克牧场以开放或自由放牧为主的放牧区土壤性质的分布,并对3种生境(树木、草地和裸地)的土壤化学性质和粒径分布进行了研究。我们重点研究了生境类型和坡位对土壤性质沿剖面分布的影响。每个样带在0-10、10-20、20-30和30-40 cm 4个深度采集土壤样品。土壤性质的分布主要受坡位和生境类型的影响,碳、全氮和全磷含量随土层深度的增加而逐渐减少。乔木生境土壤有机碳含量较高,禾草生境土壤全磷含量略低于乔木生境。草木生境下坡脚土壤全氮含量最高,分别为0.81 ~ 2.17 g/kg和1.26 ~ 2.50 g/kg。砂为主要粒度,占50 ~ 88%;该研究表明,草地土壤肥力的差异是由植被覆盖和山坡位置造成的,这对未来农牧利用决策尤为重要。
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Exploring the distribution of soil properties across an open-grazed pastoral system in Laikipia rangelands, Kenya
Abstract Laikipia rangelands in Kenya are among the most productive ecosystems but there is concern that the traditional free grazing regimes may accelerate soil and vegetation deterioration. We investigated the distribution of soil properties in the rangelands of Ilmotiok ranch in Laikipia County where grazing is predominantly open or free and examined selected soil chemical properties and particle size distribution in three types of habitats (tree, grass and bare ground) along four transects, placed diagonally across hillslope positions. We focused our study on the hypotheses that habitat types and hillslope position had an effect on soil properties distribution along the profile. Along each identified transect, soil samples were collected at four depths 0–10, 10–20, 20–30 and 30–40 cm. Distribution of soil properties mainly carbon, total nitrogen and phosphorus were influenced by hillslope position and habitat type and their contents decreased gradually with soil depth. Soil organic carbon content was high in tree habitats while in grass habitats average total phosphorus content in the profiles was slightly lower than in tree habitats. Total soil nitrogen was highest in the footslope in the tree and grass habitat and ranged between 0.81−2.17 g/kg and 1.26−2.50 g/kg, respectively. Sand was the dominant grain size fraction which accounted for 50−88%. This study demonstrated that there are soil fertility differences in the rangelands caused by vegetation cover and hillslope positions which are particularly important for future agro-pastoral use decisions.
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来源期刊
Arid Land Research and Management
Arid Land Research and Management 环境科学-环境科学
CiteScore
3.80
自引率
7.10%
发文量
23
审稿时长
9 months
期刊介绍: Arid Land Research and Management, a cooperating journal of the International Union of Soil Sciences , is a common outlet and a valuable source of information for fundamental and applied research on soils affected by aridity. This journal covers land ecology, including flora and fauna, as well as soil chemistry, biology, physics, and other edaphic aspects. The journal emphasizes recovery of degraded lands and practical, appropriate uses of soils. Reports of biotechnological applications to land use and recovery are included. Full papers and short notes, as well as review articles and book and meeting reviews are published.
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