Author:
Xu Aiyun,Wang Xing,Wang Xiaojia,Xu Dongmei,Cao Bing
Abstract
Nitrogen (N) is an essential macronutrient for plant development and growth, and increased N deposition is affecting the diversity and productivity of plants. The objective of this study was to explore the growth response of Agropyron mongolicum Keng to N addition and to determine whether N-induced changes in soil-available nutrients have indirect impacts on the biomass of A. mongolicum via the regulation of root morphological traits and NUE. We conducted a pot experiment subjecting A. mongolicum to five N addition levels (0, 0.8, 1.6, 2.4, and 4.0 g N m−2 yr−1) under greenhouse conditions. N was provided through urea [CO(NH2)2] delivered with two equal applications and added at the seeding and tillering stages. The results showed that the total biomass response of A. mongolicum to increasing N addition appeared unimodal-shaped with an N saturation threshold at 3.20 g N m−2 yr−1. The total biomass was significantly and positively correlated with the root surface area (RSA), volume (RV), length (RL), forks number (RF), N-uptake efficiency (NUpE), and N-utilization efficiency (NUtE) (p < 0.05). N-induced changes in soil-available nutrients had an indirect impact on the total biomass of A. mongolicum via the regulation of root morphological traits and NUE.
Funder
Top Discipline Construction Project of Pratacultural Science
Subject
Agronomy and Crop Science
Cited by
1 articles.
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