Decreasing Nitrogen Fertilizer Input Had Little Effect on Microbial Communities in Three Types of Soils.
Decreasing Nitrogen Fertilizer Input Had Little Effect on Microbial Communities in Three Types of Soils.
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DOI：
10.1371/journal.pone.0151622
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Zhang B
中科院分区：
文献类型：
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作者：
Yu H;Gao Q;Shao Z;Ying A;Sun Y;Liu J;Mao W;Zhang B
在本研究中，研究了不同施氮量（0、168、240、270和312 kg N ha-1）对3种土壤（粘土、冲积土和沙土）土壤性质、玉米产量和微生物群落的影响。磷脂脂肪酸分析用于表征土壤微生物群落。结果表明，无论施氮量如何，施氮均显著降低了粘土和砂质土壤的微生物生物量。这些减少更可能是由于施氮导致土壤pH值降低，特别是在沙质土壤中。结构方程建模和冗余分析结果支持了这一结论。施氮对土壤微生物群落组成也有显著影响。但随着施氮量的增加，变化差异逐渐消失。我们还观察到，无论施氮量如何，施氮量都能使玉米产量达到相同水平。这表明，农民可以在较低的施氮量（即168 kg N hm -1）下实现玉米高产，同时保持土壤微生物功能。
In this study, we examined the influence of different nitrogen (N) application rates (0, 168, 240, 270 and 312 kg N ha-1) on soil properties, maize (Zea mays L.) yields and microbial communities of three types of soils (clay, alluvial and sandy soils). Phospholipid fatty acid analysis was used to characterize soil microbial communities. Results indicated that N fertilization significantly decreased microbial biomass in both clay and sandy soils regardless of application rate. These decreases were more likely a result of soil pH decreases induced by N fertilization, especially in the sandy soils. This is supported by structural equation modeling and redundancy analysis results. Nitrogen fertilization also led to significant changes in soil microbial community composition. However, the change differences were gradually dismissed with increase in N application rate. We also observed that N fertilization increased maize yields to the same level regardless of application rate. This suggests that farmers could apply N fertilizers at a lower rate (i.e. 168 kg N ha-1), which could achieve high maize yield on one hand while maintain soil microbial functions on the other hand.