Physical and Chemical Properties of Soils under Contrasting Land Use Systems in Derived Savannah Agro-Ecological Zone of South-eastern Nigeria

The Amazon region has a great diversity of landscapes such as forests galleries, natural fields (“Cerrados Amazônicos”), dense forest, these environments made possible the formation of a broad class of soils over time. The aim of this study was to evaluate the physical and chemical properties of soils in different physiographic environments in southern Amazonas, Brazil. Three areas of representative physiographies were selected, all of them in natural conditions: natural field / forest and floodplain / dry land transitions, and corrugated relief areas. Soil samples were collected in layers of 0.0 to 0.20 and 0.80-1.0 m. From the samples collected the following physical analyzes were performed: particle size, bulk density, particle density, total porosity and saturated hydraulic conductivity; and chemical: exchangeable calcium, magnesium, aluminum and potassium available, phosphorus, potential acidity, pH and organic carbon. Based on the results of chemical analysis were calculated the sum of bases and base saturation. The results were submitted to multivariate statistics analysis, at the discretion of the principal component analysis (PCA). From the results it is clear that different physiographic environments studied influence the formation of different soil classes, featuring the diversity of Amazonian soils. The PCA allowed the distinction and formation of different similarity groups, thus enabling to relate the physical and chemical properties with the physiographic formation in which they are inserted.

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The Effect of Slope Position and Land Use on Some Soil Physical and Chemical Properties in Koohrang Area of Chaharmahal and Bakhtiari Province

Journal of Water and Soil Science ◽

10.47176/jwss.24.1.40741 ◽

2020 ◽

Vol 24 (1) ◽

Keyword(s):

Land Use ◽

Chemical Properties ◽

Slope Position ◽

Physical And Chemical Properties ◽

Physical And Chemical ◽

And Chemical Properties

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Variation of soil nutrients and bacterial community diversity of different land utilization types in Yangtze River Basin, Chongqing Municipality

PeerJ ◽

10.7717/peerj.9386 ◽

2020 ◽

Vol 8 ◽

pp. e9386

Author(s):

Yanlin Li ◽

Chunmei Zeng ◽

Meijun Long

Keyword(s):

Land Use ◽

River Basin ◽

Yangtze River ◽

Yangtze River Basin ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Chongqing Municipality ◽

Land Use Types ◽

Physical And Chemical ◽

And Chemical Properties

The diversity and community distribution of soil bacteria in different land use types in Yangtze River Basin, Chongqing Municipality were studied by using Illumina MiSeq analysis methods. Soil physical and chemical properties were determined, and correlation analyses were performed to identify the key factors affecting bacterial numbers and α-diversity in these soils. The results showed that the soil physical and chemical properties of different land use types decrease in the order: mixed forest (M2) > pure forest (P1) > grassland (G3) > bare land (B4). There were significant differences in bacterial diversity and communities of different land use types. The diversity of different land use types showed the same sequence with the soil physical and chemical properties. The abundance and diversity of bacterial in M2 and P1 soils was significantly higher than that in G3 and B4 soils. At phylum level, G3 and B4 soils were rich in only Proteobacteria and Actinobacteria, whereas M2 and P1 soils were rich in Proteobacteria, Actinobacteria and Firmicutes. At genus level, Faecalibacterium and Agathobacter were the most abundant populations in M2 soil and were not found in other soils. Pearson correlation analysis showed that soil moisture content, pH, AN, AP, AK and soil enzyme activity were significantly related to bacterial numbers, diversity and community distribution.

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