Soil organic carbon distribution in relation to land use and its storage in a small watershed of the Loess Plateau, China

Fang, Xuan; Xue, Zhijing; Li, Bicheng; An, Shaoshan

doi:10.1016/j.catena.2011.07.012

Cited by 162 publications

(83 citation statements)

References 28 publications

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“…The mean annual precipitation and temperature are 433.8 mm and 6.5 C (1970-2001), respectively. The soil, characterized by deep loess-paleosol deposits, is easily eroded due to its weak cohesion and high infiltrability (Fang et al, 2012). The water table is below 50 m, so the stocks of soil water available to plants are recharged only by rainwater.…”

Section: Study Area and Site Selectionmentioning

confidence: 99%

Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Wang

Shao

Zhang

et al. 2015

Ecological Engineering

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A B S T R A C TThe natural environments in the semiarid regions of the Chinese Loess Plateau (CLP) are fragile due to the serious soil erosion and the weak ecological services of the plants. To ascertain and then evaluate a sustainable land-use pattern in these regions, we selected six typical land-use patterns (i.e., a farmland, a natural grassland, a homogeneous shrubland (S), a mix of shrubland and cultivated grassland (S-Alf), a mix of shrubland and orchard (S-O) and a mix of shrubland and grassland (S-G)) on the plateau and then measured the soil water, related soil properties and plant root indices to a depth of 1800 cm. We also measured the aboveground net primary productivities (ANPPs). The mean soil water content (SWC) within the 0-1800 cm profile was significantly highest (15.2%) in farmland, followed by grassland (11.4%) and S-Alf (8.0%). The available water (AW), the ratio between AW and AW capacity, and the thickness of the dried soil layers also demonstrated that farmland had the best conditions of soil water, followed by grassland and shrubland. The aboveground biomasses of grassland in both non-growing (140 g m À2 ) and growing (370 g m À2 ) seasons were significantly higher than those of shrublands. The ANPPs of the grassland (2.0 g m À2 d À1 ) demonstrated a similar trend. The patterns of land use (including the mixtures of different plant species) greatly affected the patterns of vertical distribution and quantities of soil water within the 1800-cm profile. The data for the soil-water regime and the ANPP further indicated that grassland would be an optimal use of the land for these semiarid regions. This information should be useful to the ecological scientists and policy makers for developing strategies for the sustainable management of vegetation on the CLP and possibly other water-limited regions around the world.

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Section: Study Area and Site Selectionmentioning

confidence: 99%

Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Wang

Shao

Zhang

et al. 2015

Ecological Engineering

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“…In fact, organic matter in these various forms (e.g., labile fractions, humus) plays a role in several biogeochemical processes with a direct impact on plant-soil interactions [6][7][8][9]. Furthermore, organic compounds found in soil allow relatively stable reservoirs to be formed that limit CO 2 losses to the atmosphere [10,11]. Soil organic carbon content can vary based on edaphic and morphosedimentological conditions, in particular in riverbanks with different hydrological, sedimentological and topographical conditions [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Impacts of Floods on Organic Carbon Concentrations in Alluvial Soils along Hydrological Gradients Using a Digital Elevation Model (DEM)

Saint-Laurent

Paradis

Drouin

et al. 2016

Water

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This study examines the spatial distribution of the organic carbon found in alluvial soils affected by successive floods. In flood zones, very little is known of the processes associated with the development of soils subjected to frequent flooding, in particular with respect to the accumulation of litter and organic carbon concentrations. The aim of this study is to better understand the distribution of organic carbon based on various hydrological gradients associated with flood recurrence. A digital elevation model was developed from LIDAR data to assess the microtopography of the site, and further delineate floodplains and no-flood zones. Various soil properties were considered in addition to organic carbon, such as pH, soil bulk density, litter, drainage, and topographic levels (elevation). The results show that the soils in the frequent-flood zones (FFz, recurrence of 0-20 years) have significantly less total organic carbon than the soils in the no-flood zones (NFz) and the moderate flood zones (MFz,. Average values obtained for the surface horizons (0-20 cm) vary by 1.74%˘0.85% (FFz), 3.34%˘1.09% (MFz) and 3.54%˘1.77% (NFz), respectively. The absence of ground litter in the frequent flood zones helps decrease the input of organic matter in the surface horizons and progressively results in soil depletion.

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“…The coefficient of variation (CV) is a useful statistic for comparing the degree of variation from one data series to another, even if the means are drastically different from one to another. The coefficient of variation (CV) that is less than 10% indicates a low variability, 10%-90% has a moderate variability, and CV greater than 90% shows high variability (Fang et al, 2012). In this study, the CV of the available soil P varied from 37.3 to 76.5 % which indicated that the studied soil samples had moderate variability of the available P in all studied sites.…”

Section: Descriptive Statisticsmentioning

confidence: 55%

Assessment and Spatial Variability Mapping of Soil Available Phos-phorus and Potassium of Coarse-textured Soils in New Valley, Egypt Using Geostatistical Technique

2017

AJAS

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Assessment and understanding of soil available phosphorus (P) and potassium (K) content distribution is an important part of deciding whether or not the fertilization is appropriate or even necessary for a soil. So, the main objective of this study is to evaluate and map the spatial variability of the available soil P and K using the geostatistical technique. Georeferencing surface soil samples (0-25 cm) were collected from four sites representing course-textured soils in ElKharga and El-Dakhla oases. Ordinary Kriging (OK) technique was applied for the spatial interpolation of available soil P and K contents. The spatial distribution of available P and K was analyzed and mapped by Arc GIS (version 10.2.2). The results showed that concentrations of the available soil P and K ranged from 0.35 to 85.02 mg/kg and from 11 to 6204 mg/kg, respectively. The nugget-to-sill ratio suggested a strong spatial dependence for both available soil P and K in all sites of the study area, indicating that the available soil P and K were mainly controlled by intrinsic factors. The interpolation models varied for both P and K as well as from site to another site across the study area. Cross-validation proved that the chosen models were the best fitted semivariogram models to map spatial distribution of the available soil P and K. The produced maps of spatial distributions for soil P and K availability were characterized by high accuracy. So, site specific management can be planned and considered to be applied for this study area. Also, these maps can facilitate and help in making decisions for choose appropriate fertilization policies for these soils as well as to avoid adding fertilizers for sites which do not need to be fertilized. Our results confirmed that the integration of statistics, geostatistics and GIS provides a powerful tool to assess, describe and map the spatial variability of the available soil phosphorus and potassium. As well as to develop high resolution maps that may aid variable rate management (e.g. fertilization).

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Soil organic carbon distribution in relation to land use and its storage in a small watershed of the Loess Plateau, China

Cited by 162 publications

References 28 publications

Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Impacts of Floods on Organic Carbon Concentrations in Alluvial Soils along Hydrological Gradients Using a Digital Elevation Model (DEM)

Assessment and Spatial Variability Mapping of Soil Available Phos-phorus and Potassium of Coarse-textured Soils in New Valley, Egypt Using Geostatistical Technique

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