introducing different flow direction algorithms to map topographic wetness index and soil organic carbon in a loess hillslope of toshan area, golestan province, iran
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Geological controlling soil organic carbon and nitrogen density in a hillslope landscape, semiarid area of Golestan province, Iran
The effects of geological conditionwere assessed on density of Soil Organic Carbon (SOC) and Nitrogen (N)in a sequence of hillslope landscape, derived from different lithology i.e. loess deposit, reworked loess, marl with mixed siltstone and shale, reddish brown clay deposits and older loess in the semiarid area of northern Iran. However, other factors can influence SOC and N density such as la...
متن کاملMapping soil organic matter using the topographic wetness index: A comparative study based on different flow-direction algorithms and kriging methods
Terrain attributes derived from digital elevation models have been used widely for mapping soil organic matter (SOM). Among these attributes, the topographic wetness index (TWI), an index for quantitatively indicating the balance between water accumulation and drainage conditions at the local scale, has been shown to correlate with SOM. However, TWIs used in most studies are calculated using a ...
متن کاملeffect of slope position and aspect on some physical and chemical soil characteristics in a loess hillslope of toshan area, golestan province, iran
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متن کاملA novel multiple flow direction algorithm for computing the topographic wetness index
The topographic wetness index (TWI), frequently used in approximately characterizing the spatial distribution of soil moisture and surface saturation within a watershed, has been widely applied in topography-related geographical processes and hydrological models. However, it is still questionable whether the current algorithms of TWI can adequately model the spatial distribution of topographic ...
متن کاملTopographic Wetness Index Computed Using Multiple Flow Direction Algorithm and Local Maximum Downslope Gradient
Topographic wetness index (TWI) can quantify the control of local topography on hydrological processes and indicate the spatial distribution of soil moisture and surface saturation. The formulation is TWI=ln(a/tanβ), where a is the upslope contributing area per unit contour length and β is the local gradient. Many of the existing flow-direction algorithms for computing a use global partition ex...
متن کاملEffect of a long-term cultivation and crop rotations on organic carbon in loess derived soils of Golestan Province, Northern Iran
The effects of 34 years cultivation on organic carbon content of the loess derived soils were studied in Golestan province, northern Iran. Soil organic carbon (SOC) showed significant decrease in most of cases. The minimum and maximum SOC decreases were 4 and 51.14 Mg C ha-1/30 cm for 34 years. In a few cases there was an increase in SOC up to 16.93 Mg C ha-1/30 cm over the period of 34 years i...
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عنوان ژورنال:
پژوهش های حفاظت آب و خاکجلد ۲۱، شماره ۱، صفحات ۱۴۵-۱۶۲
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