Nitrogen is the most limiting nutrient for ecosystems. The natural abundance of δN (N/N) can efficiently indicate ecosystem nitrogen cycling processes. We investigated the interannual variations in natural abundance of δN in soil-plant system and soil net nitrogen mineralization in a meadow steppe of Inner Mongolia. Results across the four sampling years (2017-2020) showed that the content of soil NO-N (9.83-14.79 mg·kg) was significantly higher than that of NH-N (3.92-5.00 mg·kg) and that δN value of soil NH (13.3‰-18.3‰) was significantly higher than that of NO(3.76‰-6.14‰). The δN value of soil NO was negatively correlated with soil NO content. The δN value of soil NH was relatively higher in the dry years, while the δN value of soil NO significantly decreased in the wetter and drier years. Soil net mineralization and ammonification rates were significantly higher in the dry years than that of the wet years, while soil nitrification rates showed no correlation with annual precipitation. The δN values of plants were not related to that of soils, but nega-tively correlated with plant nitrogen content. Both δN values and nitrogen contents were significantly and positively correlated between the leguminous and non-leguminous plants, suggesting that legume could facilitate nitrogen uptake of non-leguminous plants. These results could provide supporting data for nitrogen cycling and their responses to changes in precipitation in grassland soil-plant systems.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.13287/j.1001-9332.202208.016 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Promoting nitrogen conversion in aerobic biotransformation of swine slurry with the co-application of manganese sulfate and biochar.
J Environ Manage
April 2024
College of Natural Resources and Environment, Northwest A&F University (NWAFU), Yangling, Shaanxi, 712100, China; College of Natural Resources and Environment, NWAFU-AU Microcampus, Yangling, Shaanxi, 712100, China; Key Laboratory of Low-carbon Green Agriculture in Northwestern China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi, 712100, China. Electronic address:
This study aimed to explore the co-application of MnSO (Mn) and biochar (BC) in nitrogen conversion during the composting process. A 70-day aerobic composting was conducted using swine slurry, supplemented with different levels of Mn (0, 0.25%, and 0.
View Article and Find Full Text PDFwith Nitrogen-Fixing Function Facilitates Nitrogen Recovery in Reclaimed Coal Mining Soils.
Microorganisms
December 2023
College of Resources and Environment, Shanxi Agricultural University, Taigu County, Jinzhong 030801, China.
Coal mining has caused significant soil nitrogen loss in mining areas, limiting reclamation and reuse in agriculture. This article studies the effects of organic fertilizer, inorganic fertilizer, and the combined application of with the ability of nitrogen fixation on soil nitrogen accumulation and composition in the reclamation area of the Tunlan Coal Mine from 2016 to 2022 under the conditions of equal nitrogen application, providing a scientific basis for microbial fertilization and the rapid increase in nitrogen content in the reclaimed soil of mining areas. The results showed that as the reclamation time increased, the nitrogen content and the composition and structure of the soil treated with fertilization rapidly evolved toward normal farmland soil.
View Article and Find Full Text PDF[Effects of Biochar Application on Soil Organic Nitrogen Component and Active Nitrogen in Plantations After Five Years in Northern Guangxi].
Huan Jing Ke Xue
November 2023
Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, College of Life Sciences, Guangxi Normal University, Guilin 541006, China.
The objective of this study was to research the characteristics of fractions of organic nitrogen and active nitrogen and their relationship under different biochar applications and to provide a basis for the preparation and practical application of biochar from forest wastes. In a long-term positioning test of biochar application from 2017, six different treatments were selected:0(CK), 0.5%(T1), 1%(T2), 2%(T3), 4%(T4), and 6%(T5).
View Article and Find Full Text PDFAn antibiotic from an uncultured bacterium binds to an immutable target.
Cell
September 2023
NMR Spectroscopy, Department of Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, the Netherlands. Electronic address:
Antimicrobial resistance is a leading mortality factor worldwide. Here, we report the discovery of clovibactin, an antibiotic isolated from uncultured soil bacteria. Clovibactin efficiently kills drug-resistant Gram-positive bacterial pathogens without detectable resistance.
View Article and Find Full Text PDFThe six-year biochar retention interacted with fertilizer addition alters the soil organic nitrogen supply capacity in bulk and rhizosphere soil.
J Environ Manage
July 2023
Agronomy College, Shenyang Agricultural University, Shenyang, 110866, China; Key Laboratory of Biochar and Soil Improvement, Ministry of Agriculture and Rural Affairs, PR China, Shenyang, 110866, China.
Nitrogen fractions in soil, like organic nitrogen, mineral nitrogen, and free amino acids, are sensitive pointers to the soil nitrogen pools involved in nutrient cycling. As a potential improvement measure, biochar might improve soil fertility and nutrient availability. However, few studies have focused on the long-term effects of biochar retention on the soil nitrogen supply capacity of bulk and rhizosphere soil in brown earth.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!