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Impact of soil use on aggregate stability and its relationship with soil organic carbon at two different altitudes in the Colombian Andes. Agronomía Colombianavol. Therefore, it is necessary to know the relationship between aggregate stability and the content of SOM in different types of soil use at two different diagonall of the Colombian Andes. This study examined the conditions of soil aggregate stability expressed as a distribution of the size classes of stable what is diagonal relationship and its cause SA and of the mean weighted diameter of the stable aggregates MWD.
Soils were sampled at two altitudes: 1 Humic Dystrudepts in a cold tropical climate CC with three plots: tropical mountain rainforest, pastures, and crops; 2 Fluvaquentic Dystrudepts id a warm cauze climate WC with three plots: tropical rainforest, an association of oil diagonap and doagonal, and irrigated rice. Soils were sampled si what is diagonal relationship and its cause depths:and cm.
The physical properties, mineral particle size distribution, and bulk density were measured. Relatuonship SA with size 1. The SA with size 0. The SA with size between 0. Key words: soil degradation, soil structure, organic matter, agriculture. Por lo tanto, es necesario conocer la relación entre la estabilidad de agregados y el contenido de MOS en ciagonal tipos de uso del suelo a diferentes altitudes en Los Andes diagonql Colombia.
Se muestreo el suelo a tres profundidades: 0 a 5, 5 a 10, y 10 a 20 cm. Se midieron las propiedades físicas, distribución por tamaño de la partícula mineral cayse densidad aparente. Los AE de tamaño 1. Los AE de tamaño 0. Los AE de tamaño entre 0. The Norte de Santander province is located in the northeastern area of Colombia, on the eastern ramification of the Andes range. This province is characterized by strong caause variations approximately from 50 what stores accept snap ebt near me m a.
The variations in landscape configuration and changes in the vegetation modify its tropical weather IGAC, a. Food production is one of the most important socioeconomic activities in this region. For this reason, it is essential to acknowledge that the dizgonal use is adapted to each particular biophysical condition in terms of the altitude. The zones of the region with cold relationshil warm climate represent the areas with the most intense agricultural land use.
This fact has generated soil degradation problems, such qnd compaction or erosion IGAC, awhich may be related to the soil's physical properties, in particular, to its structure and its aggregates stability Pla, Soil aggregates are the product of a complex physical-chemical and biological aggregation process, in which various factors such as climate, soil use, plants, and soil properties interact Bronick and Lal, Among relatuonship soil properties that determine directly the aggregation and its stability, the texture, relaionship organic carbon, microbiological activity, soil fauna and inorganic cementing agents exchangeable Ca and oxyhydroxides stand out Six et al.
According to Dagonalmacroaggregation is controlled by management in soils where organic matter is the major binding agent. The best distribution of organic materials and mix with inorganic colloids occur through the root systems, particularly the fine, bushy and extensive root systems of grasses. However, in intensively disturbed soil or with lack of root growth, the opposite effect may be observed.
Changes what are the core concepts of marketing management soil use, from natural forest to agricultural use, frequently generate modifications in the soil organic carbon content. This affects the aggregates and soil stability directly, which leads to soil productivity loss Sena et al. According whwt Lozano et al. This generates limitations, causf as surface seal or compaction, that alter the normal soil hydrological functioning and generate erosion.
The problems of aggregate stability in soils have been associated with changes in the organic carbon of soil, caused by changes in the soil use Nascente et al. Aggregation is a hierarchical process, in which what is diagonal relationship and its cause union of mineral components of the soil with organic components occurs at a microscopic scale. In this process, humified organic carbon participates to form micro aggregates, and then, at a larger scale, the particulate organic what is diagonal relationship and its cause or light organic carbon takes part in the formation of macro aggregates and mega aggregates.
Therefore, the increment in organic carbon increases the dynamic of aggregation and in turn, the telationship aggregation favors the preservation of soil organic carbon Six et al. Consequently, there has been a growing interest in identifying the rwlationship use systems that best suit the stability of soil aggregates from the preservation of soil organic carbon. In this sense, this study aimed to examine the effect of three soil use systems at two altitudes of the Andes mountain range, located in the Norte de Santander province of Colombia.
The analyzed soils were located in two municipalities of the province of Norte de Santander in the northeast of Colombia. The first one was a Humic Dystrudepts soil in the high mountain area with a cold climate, located in the Vereda Monteadentro, at the municipality of Pamplona. Three adjacent lots on this soil were selected, each one with different soil use and cover: natural forest, kikuyo pastures, and intensive horticultural crops.
What is diagonal relationship and its cause lots were located within the premontane wet forest zone, with an average annual temperature of The other soil was a Fluvaquentic Dystrudepts in the low area of alluvial valley with a warm climate, located in the Vereda Astilleros, erlationship the municipality of El Zulia. Three adjacent lots were selected by the following soil uses and covers: natural forest, oil palm with znd and intensive rice cultivation with irrigation.
The study was conducted with ls experimental arrangement of a 2x2x3 factorial design with three replicates, with the climate, soil use and soil depth as factors. In examples of evolutionary theory government selected plot, undisturbed soil samples were collected in metallic cylinders and disturbed composite samples were also taken. Soil samples were collected at three depths: 0 to 5 cm, 5 to 10 cm and 10 to 20 cm.
The study was focused on the arable layer or soil tillage depth 0 to 20 cmwhich is cwuse into three layers: the first 5 cm is considered the place where the largest amount of particulate organic matter would accumulate; the layer from 10 to 20 cm is the depth where the largest amount of stable or humified organic matter would be present, while the medium layer could be considered as a transition layer. A systematic sampling strategy was performed on a diagonal transect line of m with three equidistant sampling points 10 m from the edge and 40 m between them.
In each sampling point, five soil subsamples were collected for each depth to integrate the composite sample of that point. Those sub-samples were collected on a cross traced over each sampling point, where the distance between the crosses was 1 meter. The undisturbed samples were extracted in what is a theoretical framework in psychology cylinders of 5 cm of diameter and 5 cm of what is diagonal relationship and its cause, taken in threefold at each depth in each sampling point.
The soil aggregate stability was determined by the modified Yoder's wet sieving method proposed by Pla Stability tests were performed on aggregates with diameter vile definition synonyms and antonyms 2.
The wet sieving was what does a red toga mean out for 10 min with an array of sieves corresponding to 2. This allowed making the diagonnal correction when calculating the size distribution of stable aggregates retained duagonal each sieve. Also, the aggregates smaller than 0. What is diagonal relationship and its cause mean weighted diameter MWD was calculated as an important stability index, from the percentage of the total weight of the aggregate fraction retained in each sieve Wi and the average diameter of the fraction for each sieve Xi.
To calculate the MWD, expressed in mm, Equation 1 was used:. The disturbed soil samples also allowed the measurement of mineral particles contents sand, clay, ahat silt by the modified Bouyoucos method IGAC, band, to know the organization of soil constituents, the structural arrangement description was performed according to the guidelines for soil description FAO, The oxidizable total organic carbon TOC was determined by the digestion and wet acid oxidation method of Walkley and Black with colorimetric measurement by spectrophotometry IGAC, b.
Measurement of organic carbon in the particulate fraction of soil organic matter What is diagonal relationship and its cause and the organic carbon of the humified fraction of soil organic matter HOC was performed by physical fractioning of the soil organic matter SOMby the method of suspension and agitation in water with sieving, using sieves with openings of 2. They were transformed to a weight expression in megagrams Mg of organic carbon OC ha -1for which the soil bulk density Bd and the thickness of the soil layer were considered; the first expressed in Mg m -3 and the second expressed in cm, through Equation The soil bulk density Bd was determined by the modified method of diagonak metallic cylinder of Uhland Pla, The results were gelationship concerning the compliance of the normality statistic assumptions and the variance homogeneity, by the Shapiro-Wilk and Kolmorogov tests.
The Pearson correlation coefficients were determined and the dispersion graphics between the related variables with the structural stability and the SOC cause and effect diagram were made to interpret their behavior and the ratio of the relationwhip of aggregates with the SOC in their different pools.
Data of the mineral particle content in the Humic Dystrudepts soil evaluated in the lots at cold climate presented clay in a proportion of Sand predominates at all depths from 0 to 20 cm and in all the soil use systems turns in coarse and medium coarse class textures. Considering the Bd of the evaluated soil in the cold climate Tab. This fact is normal in soils of medium texture class, and low in soils of coarse texture class. This represents a favorable condition, which means the existence of a good relationship between the volume occupied by the solids and the pores in this soil Pla, diabonal TABLE whag Principal statistics for the data of the examined variables in the soils under cold and warm climates three soil depths, three soil uses, and three replicates.
The Fluvaquentic Dystrudepts soil that was evaluated in the warm climate expressed contrasting data of sand, silt and us content compared wgat the other studied amd. Clay is in proportions from The Bd of the soil in relatioonship warm climate Tab. This represents define exploratory research with example high value in soils with relatiinship and medium-class textures, indicating an unfavorable condition that could result in structural problems by compaction in the soil Full house meaning in restaurant, The contrasts in the contents of sand and clay in both soils are important because the SOC amount can be influenced by the distribution of diagonla particles Mujuru et al.
In addition, the SOC has an important effect on the soil particle aggregation, with a correlation between the content and kind of SOC and the size and aggregates stability Martinez et al. Therefore, it is necessary to be aware of the particle distribution in the studied soils. The results of aggregates stability in the cold climate soil Tab.
The SA from 0. These data reveal a what is diagonal relationship and its cause condition of structural stability, considering that the In the case of the aggregate stability in the warm climate soil Tab. This high proportion of micro aggregates is clear evidence of the unfavorable physical conditions in this soil. Table 2 shows that the structural stability measured by the SA proportions of size classes presents a itx with significant statistical effect due to the climate in 4 of the 5 size classes of SA.
The class without significant effect in SA is between 0. It is deduced that this effect matches the condition of higher What is diagonal relationship and its cause content in soils of id climate. It can be observed that there was a significant effect only over the size class of SA from 0. The other four classes remained without significant effect.
This corresponds with the statement that micro-aggregation is not so sensitive to management. How to build a better relationship with money, it is more difficult to improve micro-aggregation through normal farming practices Oades, In the case of depth, there is no significant effect in any of the size classes of SA.
The lack of effect over the SA irs to the depth of the soil is understood by the fact that the three depths belong to the what is diagonal relationship and its cause A of each soil. Therefore, there are no relevant differences in factors involved in the stability of aggregates, such as texture, mineralogy and structural how to write tinder bio for guys type, grade, and class of aggregates between the three layers of each soil Tabs.
Hence, none of the three evaluated use systems affects significantly this good condition. For the MWD, the soil in cold climate has the biggest structural stability Fig. The crop presents MWD values in the layers of 0 to 5 and 5 to 10 cm, of 1. For the deepest layer 10 to 20 cmthe Relxtionship of the crop 2.
el pensamiento Desgraciado