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首页> 美国卫生研究院文献>PLoS Clinical Trials >Linkages between straw decomposition rate and the change in microbial fractions and extracellular enzyme activities in soils under different long-term fertilization treatments
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Linkages between straw decomposition rate and the change in microbial fractions and extracellular enzyme activities in soils under different long-term fertilization treatments

机译：长期不同施肥条件下秸秆分解速率与土壤微生物组成和细胞外酶活性变化之间的联系

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In order to study the linkages between straw decomposition rate and the change in soil biological properties after straw addition to different fertilized soils, we collected soils from three long-term fertilization treatments (no-fertilizer, CK; nitrogen, phosphorus, and potassium fertilizers, NPK; NPK plus straw (S), NPKS), and incubated maize straw with these soils at 25°C for 75 days. The average straw carbon dioxide (CO2) emission rate in the CK+straw (S), NPK+S, and NPKS+S treatments was 0.58±0.51, 0.66±0.53, and 0.74±0.58 μg C g−1soil h−1, respectively. The average increase in the contents of fungi, bacteria, and Actinomycetes under straw addition treatments than the control soils (CK, NPK, and NPKS, respectively) changed in the order of CK+S≤NPK+S <NPKS+S, while bacteria and Actinomycetes peaked later in the CK+SthanNPK+S and NPKS+S treatments. Bacterial abundance unchanged, Actinomycetes abundance decreased, but fungal abundance significantly increased in soils after straw addition. The average increase in the activities of β-glucosidase (BG), β-D-cellobiosidase (CB), and β-xylosidase (XYL) differed as: CK+S<NPK+S ≤ NPKS+S, and the highest activities and increments of them occurred later in the CK+S than NPK+S and NPKS+S treatments. Straw CO2 emission rate was poorly correlated with changes in the contents of microbial fractions across all straw addition treatments, but it was significant positively correlated with the increased activities of BG, CB, and XYL under the NPK+S and NPKS+S treatments. Our results indicated that chemical fertilization and straw return soils differently increased straw decomposition because of the different increases in microbial fractions and soil enzyme activities when compared to the no-fertilizer soil, and the decomposition process was more closely correlated with C-obtaining enzymes than microbial fractions.
机译：为了研究秸秆分解速率和秸秆添加到不同肥料后土壤生物学特性变化之间的联系，我们从三种长期施肥方法（无肥料，CK，氮，磷和钾肥， NPK； NPK加稻草（S），NPKS），然后将玉米秸秆与这些土壤在25°C下孵育75天。 CK +稻草（S），NPK + S和NPKS + S处理的平均秸秆二氧化碳（CO2）排放率为0.58±0.51、0.66±0.53和0.74±0.58μgC g < / sup>土壤h -1 。与对照土壤相比，秸秆添加处理下真菌，细菌和放线菌的平均增加量分别为对照土壤（CK，NPK和NPKS），其变化顺序为CK +S≤NPK+ S

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