干旱区生态环境知识资源中心(Arid): Visual soil examination and evaluation in the sub-humid and semi-arid regions of Kenya

Arid

DOI	10.1016/j.still.2021.105135
	Visual soil examination and evaluation in the sub-humid and semi-arid regions of Kenya
	Mutuku, Eunice A.; Vanlauwe, Bernard; Roobroeck, Dries; Boeckx, Pascal; Cornelis, Wim M.
通讯作者	Mutuku, EA (corresponding author), Univ Ghent, Dept Environm, Ghent, Belgium.
来源期刊	SOIL & TILLAGE RESEARCH
ISSN	0167-1987
EISSN	1879-3444
出版年	2021
卷号	213
英文摘要	Soil quality is indicated by the interaction of physical, chemical and biological soil properties. The importance of physical properties, for example soil structure, lies in the fact that they enhance chemical and biological soil functions. Consequently, periodic assessment of structural quality is an important aspect of soil quality management. Quantitative soil properties can be used as indirect indicator parameters for soil structural changes. However, measuring these properties is not applicable, especially for smallholder farmers who cannot afford to pay for laboratory tests. This study contributes to the validation of visual field assessments by comparing the performance of such methods on 'tropical' soils. The study was conducted across two regions with contrasting soil types and land use, in the sub-humid with clay Nitiosl and semi-arid with sandy loam Cambisol locations of Kenya. At both locations, visual methods were tested on soils under cropland and under natural forests (NF). Under the cropland, evaluation sites were selected from researcher and farmer managed sites. Visual scores from visual soil assessment (VSA), visual evaluation of soil structure (VESS) and visual evaluation of soil structure using the core (coreVESS) were correlated with soil physical and chemical properties measured in the laboratory. Under the clay Nitisol, absolute values of Pearson r between VSA scores and laboratory measured soil properties ranged from 0.84 to 0.54, for VESS, they varied between 0.75 and 0.37 while for coreVESS, they ranged from 0.84 to 0.60. For the sandy loam Cambisol, absolute Pearson r values between laboratory measured soil properties and VSA scores ranged from 0.83 to 0.29, the r values were between 0.88 and 0.45 for VESS and between 0.81 and 0.40 for coreVESS. From the obtained correlations, we concluded that the visual methods tested are capable of distinguishing structural quality due to different land use and are therefore suitable for assessing soil structural quality of tropical soils in Africa. Management thresholds were determined using bulk density (BD). The target value for good soil quality (Sq<2) for the Kibugu Nitisol was BD = 0.0012*SOC+0.6476 (r = 0.71; SOC is soil organic carbon), while the trigger and remediation values were 0.93 Mg m- 3 (Sq = 2) and 0.99 Mg m- 3 (Sq = 3), respectively. In the absence of SOC data, the target mean BD for Sq<2 is 0.79 Mg m- 3. For Machang'a Cambisol, the target, trigger and remediation values were 1.48 Mg m- 3 (Sq = 2), 1.56 Mg m- 3 (Sq = 3) and 1.64 Mg m- 3 (Sq = 4), respectively.
英文关键词	Soil quality Soil structure Visual soil evaluation Physical soil properties
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000687316100008
WOS关键词	STRUCTURAL QUALITY ; CONSERVATION AGRICULTURE ; AGGREGATE STABILITY ; PHYSICAL QUALITY ; FIELD ASSESSMENT ; PART I ; INDICATORS ; YIELD ; PRODUCTIVITY ; TILLAGE
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/2XILL650/364696
作者单位	[Mutuku, Eunice A.; Cornelis, Wim M.] Univ Ghent, Dept Environm, Ghent, Belgium; [Vanlauwe, Bernard; Roobroeck, Dries] Int Inst Trop Agr, Dept Nat Resource Management, Nairobi, Kenya; [Boeckx, Pascal] Univ Ghent, Dept Green Chem & Technol, Isotope Biosci Lab ISOFYS, Ghent, Belgium
推荐引用方式 GB/T 7714	Mutuku, Eunice A.,Vanlauwe, Bernard,Roobroeck, Dries,et al. Visual soil examination and evaluation in the sub-humid and semi-arid regions of Kenya[J],2021,213.
APA	Mutuku, Eunice A.,Vanlauwe, Bernard,Roobroeck, Dries,Boeckx, Pascal,&Cornelis, Wim M..(2021).Visual soil examination and evaluation in the sub-humid and semi-arid regions of Kenya.SOIL & TILLAGE RESEARCH,213.
MLA	Mutuku, Eunice A.,et al."Visual soil examination and evaluation in the sub-humid and semi-arid regions of Kenya".SOIL & TILLAGE RESEARCH 213(2021).