Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.apsoil.2017.10.030 |
Distribution and utilization of nitrogen on moderately and heavily grazed temperate desert steppe using the N-15 tracing technique | |
Jiao, Ting1; Wu, Jianping2,3; Zhao, Shengguo2; Li, Yajuan1; Zhao, Guiqin1; Lei, Zhaomin2 | |
通讯作者 | Zhao, Guiqin |
来源期刊 | APPLIED SOIL ECOLOGY
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ISSN | 0929-1393 |
EISSN | 1873-0272 |
出版年 | 2018 |
卷号 | 124页码:69-74 |
英文摘要 | Due to overgrazing, grasslands in northern China have been severely degraded since 1980s. Grassland biomass and plant populations decreased dramatically. Application of fertilizer is a common technique for pasture management in many countries, however, it has not been widely used on China grasslands. Nitrogen (N) is an important productivity driver in grassland ecosystems, but its transportation, allocation and utilization in temperate desert steppe remained unclear. In this study, a sequential nitrogen addition experiment was conducted on a farm in southwestern Jingtai County, Gansu Province, in the transition zone between Loess Plateau and Tengger Desert. Two different grassland plots with moderate grazing (MG) and heavy grazing (HG) were fenced in 2008. N (NH4NO3) was applied at the rate of: 12.25 g N.m(-2), 24.5 g N.m(-2), 36.75 g N.m(-2) and 49 g N m(-2), respectively. To determine the amount and distribution of nitrogen applied to the grassland, the N-15 tracer technique was adopted. The results demonstrated that the recovery rates of N-15 ranged from 3.8% to 11.7% in the plants. The nitrogen recovery amount from both shoots and roots increased significantly (P < 0.05), while the recovery rate decreased gradually with increasing nitrogen application. The N-15 recovery from shoots under HG was much less than from MG. In one growing season, only 18.2%-8.0% of labeled N-15 was derived from fertilizer, so soil nitrogen is still the main source absorbed and utilized by plants. As much as 50.4%-84.4% labeled N-15 remained in soil, which was evenly distributed throughout 0-20 cm soil layer, and significantly increased with nitrogen application rates. The nitrogen remained in the top soil (0-10 cm) pool was much less than that of 10-20 cm layer (P < 0.05). The nitrogen loss amounts and rates were significantly different among N treatments, which indicated that there was an increasing trend in N loss with increasing N application rates. Loss/recovery analysis showed that 12.25 g N.m(-2) was the recommended application rate. This work is expected to provide the lowest risk/return ratio and produce both economic and environmental benefits for the degraded grassland in Gansu and analogus regions in China. |
英文关键词 | N-15 tracing technique Nitrogen fertilizer utilization rate Distribution of nitrogen Temperate desert steppe Degenerate grassland |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000428331000009 |
WOS关键词 | MASS-BALANCE ; FERTILIZER ; SOIL ; POLLUTION |
WOS类目 | Soil Science |
WOS研究方向 | Agriculture |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/207657 |
作者单位 | 1.Gansu Agr Univ, Coll Grassland Sci, Key Lab Grassland Ecosyst, Lanzhou, Gansu, Peoples R China; 2.Gansu Agr Univ, Coll Anim Sci & Technol, Lanzhou 730070, Gansu, Peoples R China; 3.Gansu Acad Agr Sci, Anim Husb Pasture & Green Agr Inst, Lanzhou 730070, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Jiao, Ting,Wu, Jianping,Zhao, Shengguo,et al. Distribution and utilization of nitrogen on moderately and heavily grazed temperate desert steppe using the N-15 tracing technique[J],2018,124:69-74. |
APA | Jiao, Ting,Wu, Jianping,Zhao, Shengguo,Li, Yajuan,Zhao, Guiqin,&Lei, Zhaomin.(2018).Distribution and utilization of nitrogen on moderately and heavily grazed temperate desert steppe using the N-15 tracing technique.APPLIED SOIL ECOLOGY,124,69-74. |
MLA | Jiao, Ting,et al."Distribution and utilization of nitrogen on moderately and heavily grazed temperate desert steppe using the N-15 tracing technique".APPLIED SOIL ECOLOGY 124(2018):69-74. |
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