Plant species composition and diversity depending on piospheres and seasonality in the southern rangelands of Kenya
作者机构：Department of Land Resource Management and Agricultural Technology(LARMAT)University of NairobiP.O.Box 29053-00625NairobiKenya
出 版 物：《Ecological Processes》 (生态过程（英文）)
年 卷 期：2017年第6卷第1期
页 面：159-167页
核心收录：
基 金：African Conservation Centre African Drylands Institute for Sustainability International Canopy of Conservation University of Nairobi
主 题：Piosphere Species composition Shannon-Wiener diversity Species richness Rangelands
摘 要：Introduction:Scarcity of water in the rangelands of Kenya has led to the introduction of *** research has however produced contrasting results on the effects of piospheres and seasonality on ShannonWiener’s diversity index,and therefore,this information is still *** this study,the impact of these piospheres on plant species composition,diversity,and richness was ***:Vegetation sampling was done during both the long rains(April)and the dry season(August).Three piosphere types(dam,trough,and a seasonal river)were studied using 0.25 m2 quadrats to sample vegetation at intervals of 20 m along 100-m *** 100-m transects were used per piosphere(north,east,south,and west directions).Shannon-Wiener’s diversity index was used to determine species richness and ***way ANOVA was used to determine if piospheric distance had an effect on species diversity,richness,and evenness using GenStat 15th ***:A total of 22 grasses and 29 forbs were recorded in the study *** most abundant grasses near the piospheres were Eragrostis tenuifolia(12.9%)and Cynodon dactylon(10.6%).*** is an increaser species and was therefore most abundant in areas of severe grazing while *** has been known to be tolerant to *** most abundant forbs were Crotalaria brevidens(37.5%).The Shannon-Wiener diversity index significantly increased(F=25.07,P=0.001)with distance from the three piospheres owing to the high grazing intensity near the piospheres and was significantly different between piospheres,being higher(F=10.05,P=0.001)at 20 m from the river(1.2±0.1)compared to a similar distance from the dam(0.9±0.1)and the trough(0.8±0.2).This was probably because the trough was smaller in size compared to the other piospheres,thereby concentrating more grazing animals per unit area and causing a greater impact on plant ***:The study demonstrated that species diversity,richness,and evenness were low ne
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