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首页> 外文期刊>Soil & Tillage Research >Soil aggregation, and total and particulate organic matter following conversion of native forests to continuous cultivation in Ethiopia.
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Soil aggregation, and total and particulate organic matter following conversion of native forests to continuous cultivation in Ethiopia.

机译:在埃塞俄比亚将原生林转为连续种植后,土壤聚集以及总有机物和颗粒有机物。

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摘要

Conversion of native forests to cultivation is usually accompanied by a decline in soil organic carbon (SOC) and nutrients, and deterioration of soil structure. The objectives of this study were: (i) to assess the effect of cultivation on soil aggregation and aggregate stability and (ii) to determine the effect of cultivation on total SOM, and the quantity and quality of POM in a Rhodic Nitisol at Munesa, in southeastern Ethiopia. Samples were collected from a cropland cultivated for 26 years and an adjacent natural forest. After cultivation, the proportion of water-stable macroaggregates was significantly reduced from >70% in the natural forest soil to 50% in the cultivated soil, being more pronounced in the >1 mm size aggregates. Cultivation also induced significant losses of OC and N both in bulk soil and water-stable aggregates. The amounts of free light fraction (free LF) C and N were more affected by cultivation than the amounts of intraparticulate organic matter (iPOM) C and N. The effect of cultivation was more pronounced on macroaggregate associated total and particulate organic matter than on microaggregate-associated fractions. The losses of POM C and N due to cultivation were highest in comparison to the total aggregate and whole soil OC and N suggesting that POM constitutes a more sensitive SOM fraction to the effects of cultivation. Soil aggregate stability and SOM could be used as indicators to apply the more appropriate management practices for increasing soil sustainability or productivity..
机译:原生林向耕作的转化通常伴随着土壤有机碳(SOC)和养分含量的下降,以及土壤结构的恶化。这项研究的目的是:(i)评估耕作对土壤聚集和骨料稳定性的影响,以及(ii)确定耕种对Munesa的Rhodic Nitisol中总SOM的影响以及POM的数量和质量,在埃塞俄比亚东南部。从耕种26年的农田和附近的天然林中收集样品。种植后,水稳性大骨料的比例从天然森林土壤中的> 70%显着降低到耕地中的50%,在> 1毫米大小的骨料中尤为明显。耕种还会导致散装土壤和水稳性团聚体中的OC和N大量流失。游离光分数(游离LF)的碳和氮的量比颗粒内有机物(iPOM)的碳和氮的量受栽培的影响更大。栽培对大骨料相关总有机物和颗粒有机物的影响比对微骨料的影响更大。相关分数。与总骨料和整个土壤中的OC和N相比,耕作造成的POM C和N损失最高,这表明POM构成了对耕作效果更为敏感的SOM组分。土壤骨料的稳定性和SOM可以用作指标,以应用更合适的管理方法来提高土壤的可持续性或生产力。

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