Nitrogen application increases soil microbial carbon fixation and maize productivity on the semiarid Loess Plateau,Plant and Soil

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Nitrogen application increases soil microbial carbon fixation and maize productivity on the semiarid Loess Plateau
Plant and Soil ( IF 3.9 ) Pub Date : 2022-04-29 , DOI: 10.1007/s11104-022-05457-7
Jinbin Wang _{1,

2} , Junhong Xie _{1,

2} , Lingling Li _{1,

2} , Zhuzhu Luo _{1,

3} , Renzhi Zhang _{1,

3} , Yuji Jiang ₄

Affiliation

Background and aims

Soil autotrophic microorganisms and plant primary production play crucial roles in soil carbon (C) cycling. However, the information remains limited to whether and how nitrogen (N) application influences the contribution of soil microbial C fixation to the soil organic C (SOC) pool.

Methods

We investigated the effects of soil autotrophic bacterial communities on SOC storage and maize yield. A field experiment was conducted with four application rates of urea on the semiarid Loess Plateau, N application at 0 kg ha^− 1 (N0), 100 kg ha^− 1 (N1), 200 kg ha^− 1 (N2), and 300 kg ha^− 1 (N3), respectively.

Results

Our results showed that SOC storage and maize yield were significantly increased by N application, but no significant SOC storage difference between N2 and N3 treatments, no further yield increase beyond 200 N kg ha^− 1 application was observed. N application significantly impacted soil Calvin-Benson-Bassham (CBB) (cbbL) gene-carrying bacterial communities via changing soil pH, nitrate N, and soil water content. The diversity of soil autotrophic bacterial communities decreased with increasing rate of N application. We detected a high abundance of the autotrophic bacterial dominant genera Xanthobacter, Bradyrhizobium, Aminobacter, and Nitrosospira. The co-occurrence network of autotrophic bacteria contained four distinct modules. Structural equation modeling further indicated that the autotrophic bacterial communities had positive relationships with SOC storage and maize yield.

Conclusions

Taken together, our results highlighted that N application stimulated the activity of soil autotrophic bacterial communities, contributing to an increase in SOC. The increase of SOC under N fertilization can stabilize soil fertility for maize production.

中文翻译：

施氮提高半干旱黄土高原土壤微生物固碳和玉米生产力

背景和目标

土壤自养微生物和植物初级生产在土壤碳 (C) 循环中起着至关重要的作用。然而，关于施氮 (N) 是否以及如何影响土壤微生物固碳对土壤有机碳 (SOC) 库的贡献的信息仍然有限。

方法

我们研究了土壤自养细菌群落对 SOC 储存和玉米产量的影响。在半干旱黄土高原上进行了四种尿素施用量的田间试验，施氮量为 0 kg ha ^{- 1} (N0)、100 kg ha ^{- 1} (N1)、200 kg ha ^{- 1} (N2) 和 300 kg ha ^{- 1} (N3)，分别。

结果

我们的研究结果表明，施氮显着增加了 SOC 储存和玉米产量，但 N2 和 N3 处理之间没有显着的 SOC 储存差异，没有观察到超过 200 N kg ha ^{- 1的施用量进一步增加产量。}N 施用通过改变土壤 pH 值、硝酸盐 N 和土壤含水量显着影响土壤 Calvin-Benson-Bassham (CBB) ( cbbL ) 基因携带细菌群落。土壤自养细菌群落的多样性随着施氮量的增加而降低。我们检测到高丰度的自养细菌优势属黄杆菌属、慢生根瘤菌属、氨杆菌属和亚硝化螺旋菌属. 自养细菌的共现网络包含四个不同的模块。结构方程模型进一步表明，自养细菌群落与 SOC 储存和玉米产量呈正相关。