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首页> 外文期刊>Waste management & research >Effects of municipal solid waste compost application on the microbial biomass of cultivated and non-cultivated soil in a semi-arid zone
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Effects of municipal solid waste compost application on the microbial biomass of cultivated and non-cultivated soil in a semi-arid zone

机译：城市固体废弃物堆肥施用对半干旱区耕地和非耕地土壤微生物生物量的影响

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The aim of this study was to assess whether soil microbial biomass could be used as an indicator of environmental changes following the application of organic residue (compost of municipal solid waste and farmyard manure) or mineral fertilizers (N and P) into cultivated or uncultivated loam—clayey soil, for three consecutive years. The carbon and nitrogen of the microbial biomass (B_C and B_N) were studied using the fumigation-extraction method. For the two cultivated and uncultivated plots, B_N and B_C were more important in the superficial profile (0-20 cm) than in the deep one (20-40 cm). In the uncultivated soil, we observed a good linear relation between B_C and B_N at the level of upper soil horizon during the wet season with r coefficients of 0.95,0.71 and 0.80 for the consecutive years 2000, 2001 and 2002, respectively. Microbial biomasses C and N increased during the rainy season and decreased during the dry season. Microbial biomass C and N showed the higher content with compost and farmyard manure at 40 tonnes ha~(-1). Moreover, the results showed that at the beginning of the experiment, the microbial biomass was higher in the ploughed wheat-cultivated plot than in the uncultivated one. Microbial biomass C and N in the cultivated plot amended with compost at 40 tonnes ha~(-1) were significantly different in comparison with the soil microbial biomass amended with farmyard manure. The combining of chemical fertilizer with the organic fertilizer, such as compost at 40 or 80 tonnes ha~(-1) and farmyard manure, increased the microbial biomasses C and N after 1 and 2 years. In the cultivated or uncultivated plots the results revealed that the best application rate of the compost was 40 tonnes ha~(-1) and when the compost rate was increased from 40 to 80 tonnes ha~(-1) both B_C and B_N decreased significantly.
机译：这项研究的目的是评估在将有机残留物（城市固体废物和农家粪便的肥料）或矿物肥料（N和P）施用于耕种或未耕种的壤土后，土壤微生物生物量是否可以用作环境变化的指标-黏土，连续三年。使用熏蒸-萃取方法研究了微生物生物量（B_C和B_N）的碳和氮。对于两个耕地和未耕地，B_N和B_C在浅层剖面（0-20厘米）中比在深层剖面（20-40厘米）中更为重要。在未耕作的土壤中，我们观察到在潮湿季节上层土壤水平B_C和B_N之间存在良好的线性关系，连续2000、2001和2002年的r系数分别为0.95、0.71和0.80。微生物生物量C和N在雨季增加，而在旱季减少。堆肥和农家肥中的微生物生物量碳和氮含量较高，为40 t·ha〜（-1）。此外，结果表明，在实验开始时，耕过的小麦耕作地的微生物量高于未耕种的耕地。与堆肥处理后的土壤微生物量相比，40公顷（-1）堆肥处理的耕地微生物量碳，氮显着不同。化肥和有机肥（如40或80吨ha-1（-1）的堆肥）和农家粪肥的结合，增加了1年和2年后微生物的生物量C和N。结果表明，在耕地或未耕地，堆肥的最佳施用量为40吨ha〜（-1）；当堆肥量从40吨ha〜（-1）增加时，B_C和B_N均显着下降。 。

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