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Farming system-induced variability of some soil properties in a sub-humid zone of Ghana

机译：农业系统对加纳半湿润地区某些土壤性质的变异性

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摘要

This study assessed the effects of different farming systems, namely woodlot (WL), alley farming (AL), conventional tillage (CT) and natural fallow (NF) on the variability of organic carbon (OC) content and mean weight diameter (MWD) of a degraded Ferric Acrisol in the sub-humid zone of Ghana. The soils under woodlot accumulated the highest amount of organic carbon (18.6 g kg−1) with the least spatial variability apparently due to the greater additions of litter and minimum tillage. The conventionally tilled soil had the least OC content (13.1 g kg−1). Similar to the OC content, the woodlot soils also had the highest aggregate stability (MWD = 1.78 mm) and the least spatial variability. The stability of soil aggregates under the farming systems was greatly influenced by OC content; there was a good correlation between OC and MWD (r > 0.62**). Correlograms showed that OC and MWD are space dependent. The correlation length for OC under the different farming systems followed the order WL > NF > AL > CT, indicating that WL ensured a greater uniform distribution soil organic matter. The spatial distribution in MWD followed the same trend observed for OC. The MWD in the other farming systems was poorly related from point to point with shorter k-values, suggesting lack of uniformity due to low accumulation of OC. Generally, the woodlot system appeared to be a better, low-input restorer of soil productivity.
机译：这项研究评估了不同耕作制度的影响，即林地（WL），小巷耕作（AL），常规耕作（CT）和自然休耕（NF）对有机碳（OC）含量和平均体重直径（MWD）变异性的影响加纳半湿润地区降解的铁酸甲crisol。林地下的土壤积累了最多的有机碳（18.6 g kg-1 ），而空间变异性最小，这显然是由于增加了凋落物和最小耕作。传统耕作的土壤中OC含量最低（13.1 g kg-1 ）。与OC含量相似，林地土壤也具有最高的聚集体稳定性（MWD = 1.78 mm）和最小的空间变异性。耕作制度下土壤团聚体的稳定性受OC含量的影响很大。 OC和MWD之间有很好的相关性（r> 0.62 ** ）。相关图显示OC和MWD与空间有关。不同耕作制度下OC的相关长度遵循WL> NF> AL> CT的顺序，表明WL确保了更大的土壤有机质均匀分布。 MWD中的空间分布遵循与OC相同的趋势。在其他耕作系统中，MWD之间的k值较短，点与点之间的关联性较差，这表明由于OC积累低，导致缺乏统一性。通常，林地系统似乎是一种更好的，低投入的土壤生产力的恢复者。

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