Biomass and quality changes of forages along land use and soil type gradients in the riparian zone of Lake Naivasha, Kenya
Biomass and quality changes of forages along land use and soil type gradients in the riparian zone of Lake Naivasha, Kenya
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肯尼亚奈瓦沙湖河岸地区牧草生物量和质量随土地利用和土壤类型梯度的变化
DOI：
10.1016/j.ecolind.2014.10.013
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发表时间：
2014
影响因子：
6.9
通讯作者：
Südekum
中科院分区：
文献类型：
--
作者：
Changwony;Alvarez;Lanyasunya;C. Dold;M. Becker. M;Südekum
奈瓦沙湖水位的下降逐渐暴露了地表，形成了一个代表1-30年放牧持续时间的时序断面。这种时间序列为研究土地利用持续时间对资源可获得性和资源基础质量的影响提供了一个独特的模型。特别是热带淡水湖河岸带牧草品质变化的研究，至今尚未见报道。采用4×4拉丁方设计(4个时序位置×4个土壤类型)，研究了放牧时间对牧草生物量、粗蛋白含量和能量质量的影响。记录了物种组成，并在2011年2月至8月期间每月对生物量进行采样。利用频域反射仪传感器记录土壤水分。对植被样品进行了干物质、氮和代谢能的分析。土地利用年限的增加有利于物种优势从狼尾草向狼尾草的转变，这与干物质产量的减少和植物含氮量的增加有关。所有测量变量在冲积物上形成的土壤比在湖泊沉积上形成的土壤倾向于更高。增加土壤氮素和重力含水率可促进生物量积累。粗蛋白质产量和代谢能随牧草物候期的不同而变化，到成熟期(牧草结实)时显著下降。连续放牧和土壤水分减少，无论是在降雨量少的时候，还是在距离湖岸更远的时候，都影响到牧草的组成以及牧草的产量和质量。因此，这可能会不同地影响河岸土地作为牧场和放牧动物饲料资源区的适宜性。
The recession of the water level of Lake Naivasha has incrementally exposed land surfaces creating a chronosequential transect representing durations of 1–30 years of exposure to grazing. This chronosequence provides a unique model to study the effects of land use duration on resource availability and resource base quality. Particularly, pasture quality changes in the riparian land of tropical fresh water lakes have so far not been studied. We assessed the effect of the duration of exposure to grazing on the biomass production, crude protein content and energy quality of pastures in a 4 × 4 latin square design (4 chronosequence positions × 4 soil types). Species composition was recorded and biomass was sampled at monthly intervals from February to August 2011. Soil moisture was recorded using frequency domain reflectometry sensors. Vegetation samples were analyzed for dry matter, nitrogen and metabolizable energy. Increased land use duration favored a shift in species dominance fromPennisetum clandestinumtoCynodon plectostachyus, which was associated with a reduction in dry matter yield and increased plant nitrogen content. All measured variables tended to be higher in soils formed on alluvial than in those formed on lacustrine deposits. Increased soil N and gravimetric moisture content stimulated biomass accumulation. The crude protein yield and metabolizable energy changed with phenological stages of the pasture and declined significantly towards maturity (seed setting of grasses). Continuous grazing and reduced soil moisture content, both during low rainfall and increased distance from the lake shore, affected the composition of pasture grasses as well as forage yield and quality. This may thus differentially affect the suitability of the riparian land as pasture ground and feed resource area for grazing animals.
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DOI：
--
发表时间：
2003
期刊：
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DOI：
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2003
期刊：
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