Soil aggregate size and long-term fertilization effects on the function and community of ammonia oxidizers

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Soil aggregate size and long-term fertilization effects on the function and community of ammonia oxidizers
	Li, Pei-Pei ; Han, Yan-Lai ; He, Ji-Zheng ; Zhang, Shui-Qing ; Zhang, Li-Mei
刊名	GEODERMA
	2019-03-15
卷号	338 页码:107-117
关键词	Combined organic and reduced chemical N fertilization Soil aggregation Net nitrification rate Ammonia-oxidizing bacteria and archaea N conservation
ISSN号	0016-7061
英文摘要	Long-term field fertilization trials have suggested that reduced chemical nitrogen (N) plus organic fertilization can effectively reduce N loss without sacrificing crop yield, while the knowledge of how organic fertilizers regulate soil microorganisms and their function in N transformation are limited. In this study, the response of net nitrification rate and the ammonia-oxidizer community within soil aggregates to long-term combined organic N and reduced chemical N fertilization was evaluated to understand the underlying mechanism of the practice in mitigating soil N loss. The fertilization experiment included an unfertilized control; chemical N fertilizer (N), superphosphate (P) and potassium sulfate (K) fertilizer (NPK); NPK plus straw (NPKS); and NPK plus manure (NPKM). The results showed that the large macro-aggregates mass (> 2 mm) in soil significantly increased from 34.1% in NPK to 47.2% in NPKS (P < 0.05). NPKS and NPKM both had positive effects on soil moisture retention, total N (TN), soil organic carbon (SOC), ammonium (NH4+-N) and nitrate (NO3--N) accumulation, particularly within micro- (< 0.25 mm) and small macro-aggregates. Compared with the NPK treatment, soil net nitrification rate (NNR) and ammonia-oxidizing bacterial (AOB) abundance decreased by 67.1% and 40.7% respectively under NPKS (P < 0.05), and the decrease mainly appeared in large macro-aggregate and micro aggregates. The net nitrification rate was significantly correlated with ammonia-oxidizing archaea (AOA) abundance only in small macro-aggregates (r = 0.642, n = 12, P < 0.05). In contrast, NRR was positively correlated with AOB abundance within small macro- and micro-aggregate size classes (r values ranged from 0.654 to 0.813, P < 0.05). The community structure of AOB varied among different fertilization treatments, while AOA community differentiation was mainly dependent on aggregate size. The shift of the AOA and AOB communities corresponded with high moisture and lower ammonia content in the large macro-aggregates and were potentially responsible for the suppressed nitrification activity in the NPKS treatment. These results indicated that reduced chemical N plus organic fertilization is beneficial for increasing N concentration in large macro-aggregates.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42792]
专题	生态环境研究中心_城市与区域生态国家重点实验室
作者单位	1.Henan Agr Univ, Coll Resource & Environm Sci, Zhengzhou 450002, Henan, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China 3.Henan Acad Agr Sci, Inst Plant Nutr & Environm Resource Sci, Zhengzhou 450002, Henan, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Pei-Pei,Han, Yan-Lai,He, Ji-Zheng,et al. Soil aggregate size and long-term fertilization effects on the function and community of ammonia oxidizers[J]. GEODERMA,2019,338:107-117.
APA	Li, Pei-Pei,Han, Yan-Lai,He, Ji-Zheng,Zhang, Shui-Qing,&Zhang, Li-Mei.(2019).Soil aggregate size and long-term fertilization effects on the function and community of ammonia oxidizers.GEODERMA,338,107-117.
MLA	Li, Pei-Pei,et al."Soil aggregate size and long-term fertilization effects on the function and community of ammonia oxidizers".GEODERMA 338(2019):107-117.