Spatial variability of soil properties under different landuse in Koupendri catchment, Benin

IF 2 Q3 SOIL SCIENCE

Spanish Journal of Soil Science Pub Date : 2020-03-03 DOI:10.3232/SJSS.2020.V10.N1.04

C. Azuka, A. M. Igué

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引用次数: 2

Abstract

The spatial distribution of soil properties especially saturated hydraulic conductivity (Ksat), Bulk density (BD), soil organic carbon (SOC), total nitrogen (TN) and available phosphorus (Avail.P) is fundamental to sustainable management of soil resources. About 291 surface soil (0-20 cm) samples were collected across three land use types (maize-sorghum (MS), rice field and fallow shrub-grassland (FSG) in Koupendri, north-west Benin using a grid sampling of 25 m x 25 m supplemented with samplings at 5 m x 5 m. Data obtained were subjected to classical and spatial statistics, Pearson’s correlation and analysis of variance using GENSTAT. The soil properties showed normal and non-normal distribution, variation was high (75-126.7 %) for Ksat, moderate (29-45 %) for SOC, C/N and Avail.P, and low (7-15) for BD and TN across the land use. Land use had significant (P < 0.05) effect on all the soil properties evaluated except C/N. The highest values of Ksat (151.6 cm/d), SOC (1.26 %), BD (1.79 g/cm3), TN (0.105 %), Avail.P (4.66 ppm) and C/N (12.14) were obtained under the MS cropland whereas porosity was highest (43.7 %) in the rice field. High significant correlation (P < 0.01) was observed among the soil properties irrespective of land use. The correlation length (65-300 m) and nugget effect ratio indicates high variation and strong spatially dependent soil properties. However, TN, BD, Avail.P and C/N were weakly spatially dependent. The variograms were fitted with mostly exponential and spherical models. The interpolation map could help in delineating different management zones and for making good agronomic decisions.

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贝宁库彭德里流域不同土地利用下土壤性质的空间变异性

土壤性质的空间分布，特别是饱和导水率（Ksat）、容重（BD）、土壤有机碳（SOC）、总氮（TN）和有效磷（Avail.P）的空间分布是土壤资源可持续管理的基础。在贝宁西北部的库彭德里，采用25米x 25米的网格采样，辅以5米x 5米的采样，在三种土地利用类型（玉米高粱（MS）、稻田和休耕灌木草地（FSG））采集了约291个表层土壤（0-20厘米）样本。所获得的数据经过经典和空间统计、Pearson相关性和GENSTAT方差分析。土壤性质呈正态和非正态分布，Ksat变化较大（75-126.7%），SOC、C/N和Avail.P变化中等（29-45%），BD和TN变化较小（7-15）。土地利用对除C/N外的所有土壤性质均有显著影响（P<0.05）。Ksat（151.6cm/d）、SOC（1.26%）、BD（1.79g/cm3）、TN（0.105%）、Avail.P（4.66ppm）和C/N（12.14）在MS农田中最高，而孔隙度在稻田中最高（43.7%）。与土地利用无关的土壤性质之间存在高度显著的相关性（P<0.01）。相关性长度（65-300m）和金块效应比表明变化较大，土壤性质具有较强的空间依赖性。TN、BD、Avail.P和C/N的空间依赖性较弱。变异函数主要采用指数和球形模型拟合。插值图可以帮助划定不同的管理区域，并做出良好的农艺决策。

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来源期刊

Spanish Journal of Soil Science SOIL SCIENCE-

CiteScore

2.20

自引率

0.00%

发文量

期刊介绍： The Spanish Journal of Soil Science (SJSS) is a peer-reviewed journal with open access for the publication of Soil Science research, which is published every four months. This publication welcomes works from all parts of the world and different geographic areas. It aims to publish original, innovative, and high-quality scientific papers related to field and laboratory research on all basic and applied aspects of Soil Science. The journal is also interested in interdisciplinary studies linked to soil research, short communications presenting new findings and applications, and invited state of art reviews. The journal focuses on all the different areas of Soil Science represented by the Spanish Society of Soil Science: soil genesis, morphology and micromorphology, physics, chemistry, biology, mineralogy, biochemistry and its functions, classification, survey, and soil information systems; soil fertility and plant nutrition, hydrology and geomorphology; soil evaluation and land use planning; soil protection and conservation; soil degradation and remediation; soil quality; soil-plant relationships; soils and land use change; sustainability of ecosystems; soils and environmental quality; methods of soil analysis; pedometrics; new techniques and soil education. Other fields with growing interest include: digital soil mapping, soil nanotechnology, the modelling of biological and biochemical processes, mechanisms and processes responsible for the mobilization and immobilization of nutrients, organic matter stabilization, biogeochemical nutrient cycles, the influence of climatic change on soil processes and soil-plant relationships, carbon sequestration, and the role of soils in climatic change and ecological and environmental processes.