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首页> 外文期刊>American journal of applied sciences >Effects of Land Use Practices on the Organic Carbon Content, Cation Exchange Capacity and Aggregate Stability of Soils in the Catchment Zones | Science Publications
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Effects of Land Use Practices on the Organic Carbon Content, Cation Exchange Capacity and Aggregate Stability of Soils in the Catchment Zones | Science Publications

机译：土地利用方式对集水区土壤有机碳含量，阳离子交换能力和集聚稳定性的影响科学出版物

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> Problem statement: Land use practice leads to changes in the physico-chemical properties of soils, such as Soil Organic Carbon (SOC), Cation Exchange Capacity (CEC) and Soil Aggregate Stability (SAS) that cause soil erosion. Approach: Merek catchment, Iran suffers from land degradation due to poor land use practice. A study was carried out with the objectives: (i) to determine soil nutrient status in different agro-ecological zones in Merek catchment; and (ii) to evaluate the influence of land use practices on SOC, CEC and SAS. Results: It was found that soil texture was silty and clay, while soil reaction was alkaline (pH was 7.75). The respective amount of carbonates was 32 and 36% in the top-soil and sub-soil respectively, indicating high level of alkalinity in the soils of the study area. The mean SAS of the surface soil layer for agriculture, rangeland and forest was 53, 61 and 64%, respectively with its mean in the topsoil of agriculture is significantly lower (P≤0.05) than the other zones. SOC level in the agriculture, rangeland and forest were 1.35, 1.56, 2.14 % in the topsoil and 1.03, 1.33 and 1.45%, in the subsoil of the respective areas. The results of t-test and ANOVA analyses showed that SOC means are significantly different from each other within soil depth and among agro-ecological zones. The CEC in the agriculture, rangeland and forest areas were 25.8, 24.6 and 35.1 cmolckg-1 for the top-soil and 31.1, 26.8 and 26.9 cmolckg-1 in the sub-soil, respectively. All the above changes are due to the negative effects of agricultural activities. Conclusion: Improper tillage practice (up-down the slope), conversion of the rangeland and forest to rain-fed areas, crop residue burning, over grazing and forest clearance contribute to reduction in SOC and SAS in the Merek catchment, Iran.
机译： > 问题陈述：土地使用实践导致土壤理化特性的变化，例如土壤有机碳（SOC），阳离子交换容量（CEC）和土壤聚集体导致土壤侵蚀的稳定性（SAS）。 方法：默里克流域，伊朗因不良土地使用习惯而遭受土地退化。进行了一项研究，其目标是：（i）确定梅雷克流域不同农业生态区的土壤养分状况; （ii）评估土地使用方式对SOC，CEC和SAS的影响。 结果：发现土壤质地为粉质和黏土，而土壤反应为碱性（pH为7.75）。表层土壤和下层土壤的碳酸盐含量分别为32％和36％，表明研究区域土壤的碱度较高。农业，牧场和森林的表层土壤平均SAS分别为53％，61％和64％，其在农业表层土壤中的平均SAS显着低于其他地区（P≤0.05）。农业，牧场和森林的SOC水平在表层土壤中分别为1.35％，1.56％，2.14％，在下层土壤中分别为1.03％，1.33％和1.45％。 t检验和ANOVA分析的结果表明，土壤深度和农业生态区之间的SOC均值显着不同。农业，牧场和森林地区的表层土壤CEC值分别为25.8、24.6和35.1 cmol c kg -1 ，最高土壤为31.1、26.8和26.9 cmol c kg -1 分别位于子土壤中。上述所有变化都是由于农业活动的负面影响。 结论：不正确的耕作方式（坡度上下），牧场和森林向雨养地区的转化，作物残渣燃烧，过度放牧和森林砍伐，都导致了土壤中SOC和SAS的降低。伊朗梅雷克流域。

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