Arid
DOI10.1016/j.geoderma.2016.03.022
Long-term assessment of soil and water conservation measures (Fanya-juu terraces) on soil organic matter in South Eastern Kenya
Saiz, Gustavo1; Wandera, Fredrick M.2; Pelster, David E.2; Ngetich, Wilson3; Okalebo, John R.3; Rufino, Mariana C.4; Butterbach-Bahl, Klaus1,2
通讯作者Saiz, Gustavo
来源期刊GEODERMA
ISSN0016-7061
EISSN1872-6259
出版年2016
卷号274页码:1-9
英文摘要

A comprehensive assessment of soil organic matter (SOM) dynamics in semi-arid agrosystems implementing soil and water conservation (SWC) measures is still lacking despite their extent, ecological and economic significance. Therefore, we assessed the long-term impact of a commonly used SWC technique (Fanya-juu terracing) on SOM-related properties in South Eastern Kenya. A soil sampling campaign was conducted in a replicated stratified random manner on three land uses that had been continuously managed for over 30 years. Samples were analyzed for organic carbon and nitrogen contents, delta C-13, delta N-15 pH and texture. Compared to sites implementing conventional agriculture, the establishment of SWC structures in this erosion-prone landscape resulted in the recovery of SOM levels comparable to those observed in neighboring semi-natural ecosystems. Sites under conventional agriculture practices contained 20 Mg C ha(-1) (0.85 m), while sites with SWC measures and those hosting semi-natural vegetation stored above a third more. There were significant differences in soil C/N ratios as well as in delta C-13 and delta N-15 values between SWC cultivation practices classified according to the presence or absence of trees. The presence of woody vegetation in sites with SWC structures had a strong impact on the spatial variability of SOM-related properties. There was also a significant negative relationship between delta N-15 values and C/N ratios across the different land uses. Our findings indicate the existence of contrasting SOM dynamics caused by vegetation-related effects, and provide suggestions for enhancing SOM storage in agricultural sites implementing SWC measures. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词Semi-arid ecosystems Soil water conservation Climate-smart agriculture Small household farms Soil organic carbon Stable isotopes
类型Article
语种英语
国家Germany ; Kenya
收录类别SCI-E
WOS记录号WOS:000376543600001
WOS关键词TREE-GRASS INTERACTIONS ; CARBON STOCKS ; PRECIPITATION GRADIENT ; SPATIAL VARIABILITY ; ECOSYSTEM SERVICES ; N2O EMISSIONS ; BULK-DENSITY ; NITROGEN ; PLANT ; VEGETATION
WOS类目Soil Science
WOS研究方向Agriculture
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193192
作者单位1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, D-82467 Garmisch Partenkirchen, Germany;
2.Int Livestock Res Inst, Livestock Syst & Environm, Nairobi 3070900100, Kenya;
3.Univ Eldoret, Dept Soil Sci, POB 1125, Eldoret, Kenya;
4.Ctr Int Forestry Res CIFOR, POB 30677, Nairobi, Kenya
推荐引用方式
GB/T 7714
Saiz, Gustavo,Wandera, Fredrick M.,Pelster, David E.,et al. Long-term assessment of soil and water conservation measures (Fanya-juu terraces) on soil organic matter in South Eastern Kenya[J],2016,274:1-9.
APA Saiz, Gustavo.,Wandera, Fredrick M..,Pelster, David E..,Ngetich, Wilson.,Okalebo, John R..,...&Butterbach-Bahl, Klaus.(2016).Long-term assessment of soil and water conservation measures (Fanya-juu terraces) on soil organic matter in South Eastern Kenya.GEODERMA,274,1-9.
MLA Saiz, Gustavo,et al."Long-term assessment of soil and water conservation measures (Fanya-juu terraces) on soil organic matter in South Eastern Kenya".GEODERMA 274(2016):1-9.
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