Nitrogen addition and mowing affect microbial nitrogen transformations in a C4 grassland in northern China
文献类型：SCI/SSCI论文
| 作者 | Wang C.; Butterbach-Bahl, K.; He, N.; Wang, Q.; Xing, X.; Han, X. |
| 发表日期 | 2015 |
| 关键词 | sub-arctic meadow terrestrial ecosystems soil-microorganisms tallgrass prairie n-mineralization biomass removal climate-change elevated co2 responses fertilization |
| 英文摘要 | Microbial nitrogen (N) transformations play a key role in regulating N cycling in grassland ecosystems. However, there is still little information on how management of semi-arid grassland such as mowing and/or N fertilizer application affects microbial activity and N transformations. In a field experiment in northern China, N was added at a rate of 10 g N m(-2) year(-1) as NH4NO3 to mown and unmown plots (4 x 4 m(2)) and in situ rates of net ammonification (R-amm), nitrification (R-nit) and mineralization (R-min) were followed at monthly intervals for the vegetation growth periods in the years 2006-2009. In addition, we also measured soil microbial biomass carbon (MBC) and nitrogen (MBN), microbial respiration (MR) and peak above-ground biomass in August of each measurement year. Driven by the pronounced inter-annual variability of rainfall, all the properties investigated varied markedly across years. Nevertheless, we were able to demonstrate that over the 4 years N addition significantly stimulated R-nit, R-min and MBN, on average, by 288, 149 and 11.6%, respectively. However, N addition decreased MBC significantly as well as the ratio of MBC:MBN by, on average, 10 and 23%, respectively, whereas an effect of N addition on MR could not be demonstrated. Mowing decreased MBN, MR and qCO(2) significantly by 9, 28 and 24%, respectively, but no effects were found on microbial net N transformation rates and MBC. N addition and mowing interactively affected R-amm and R-min, and MBN, MBC:MBN. In summary, our results indicate a positive effect of N addition but a negative effect of mowing on microbial N transformation in this C4 grassland in northern China. |
| 出处 | European Journal of Soil Science |
| 卷 | 66 |
| 期 | 3 |
| 页 | 485-495 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1351-0754 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38920]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang C.,Butterbach-Bahl, K.,He, N.,et al. Nitrogen addition and mowing affect microbial nitrogen transformations in a C4 grassland in northern China. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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