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首页> 外文期刊>International journal of soil science >Soil organic matter status changes with cultivation of overgrazed pastures in semi-dry west central Iran.
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Soil organic matter status changes with cultivation of overgrazed pastures in semi-dry west central Iran.

机译：伊朗中西部半干旱地区，土壤有机质状况随着过度放牧牧场的种植而变化。

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The native intensively grazed and degraded pastures in dry areas are initially low in soil organic matter content. Therefore, frequently cultivation and conversion of these lands to croplands might have a positive influence on soil properties including soil organic matter. This study was conducted to determine the impacts of cultivation of overgrazed pasture on selected soil organic matter components in Javanmardi Plain, west central Iran. Total Organic Carbon (TOC), Particulate Organic Carbon (POC) compounds, total nitrogen and carbohydrate fractions were measured. Two sites including a pasture overgrazed by sheep in adjacent with one pasture converted to wheat fields for more than 23 years were used. Soil samples were taken from 0-5 and 5-15 cm depths in each site. Land use change resulted in significant (p<0.05) increases in TOC, POC, total nitrogen and carbohydrates contents in both depths. In most cases, the amounts of TOC in macroaggregates (0.25-2 mm) were significantly higher than those of microaggregates (0.05-0.25 mm) and large portion of TOC was stored in the macroaggregates. Cultivation of overgrazed pasture considerably increased the percentage of POC/TOC, reflecting more plant residue inputs under plantation. Although, land use change considerably increased TOC and carbohydrate amounts of intact soil, in most cases positive impact of land use change on storage of TOC and carbohydrate in aggregates were not (p>0.05) significant.
机译：干旱地区原生放牧和退化的牧场最初土壤有机质含量较低。因此，这些土地的频繁耕种和耕作可能会对包括土壤有机质在内的土壤特性产生积极影响。进行这项研究是为了确定过度放牧的牧场对伊朗中西部爪哇海岸平原某些土壤有机质组成部分的影响。测量了总有机碳（TOC），颗粒有机碳（POC）化合物，总氮和碳水化合物馏分。使用了两个地点，其中包括被绵羊过度放牧的牧场，以及一个牧场被改建为麦田超过23年的牧场。在每个位置的0-5和5-15 cm深度处采集土壤样品。土地用途的变化导致两个深度的TOC，POC，总氮和碳水化合物含量显着（p <0.05）增加。在大多数情况下，大骨料中的TOC含量（0.25-2 mm）显着高于微骨料中的TOC含量（0.05-0.25 mm），并且大部分TOC被储存在大骨料中。过度放牧的牧场的种植大大增加了POC / TOC的百分比，反映了种植下更多的植物残渣投入。尽管土地利用变化显着增加了完整土壤的TOC和碳水化合物含量，但在大多数情况下，土地利用变化对聚集物中TOC和碳水化合物存储的积极影响并不显着（p> 0.05）。

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