...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Soil Biology & Biochemistry >Effects of repeated fertilizer and cattle slurry applications over 38 years on N dynamics in a temperate grassland soil
【24h】

Effects of repeated fertilizer and cattle slurry applications over 38 years on N dynamics in a temperate grassland soil

机译：38年来反复施肥和牛粪浆对温带草原土壤氮素动态的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effects of repeated synthetic fertilizer or cattle slurry applications at annual rates of 50, 100 or 200 m[super]3 ha[super]-1 yr[super]-1 over a 38 year period were investigated with respect to herbage yield, N uptake and gross soil N dynamics at a permanent grassland site. While synthetic fertilizer had a sustained and constant effect on herbage yield and N uptake, increasing cattle slurry application rates increased the herbage yield and N uptake linearly over the entire observation period. Cattle slurry applications, two and four times the recommended rate (50 m[super]3 ha[super]-1 yr[super]-1, 170 kg N ha[super]-1), increased N uptake by 46 and 78%, respectively after 38 years. To explain the long-term effect, a [super]15N tracing study was carried out to identify the potential change in N dynamics under the various treatments. The analysis model evaluated process-specific rates, such as mineralization, from two organic-N pools, as well as nitrification from NH sub(4[super]+ and organic-N oxidation. Total mineralization was similar in all treatments. However, while in an unfertilized control treatment more than 90% of NH) sub(4)[super]+ production was related to mineralization of recalcitrant organic-N, a shift occurred toward a predominance of mineralization from labile organic-N in the cattle slurry treatments and this proportion increased with the increase in slurry application rate. Furthermore, the oxidation of recalcitrant organic-N shifted from a predominant NH sub(4[super]+ production in the control treatment, toward a predominant NO) sub(3)[super]- production (heterotrophic nitrification) in the cattle slurry treatments. The concomitant increase in heterotrophic nitrification and NH sub(4[super]+ oxidation with increasing cattle slurry application rate was mainly responsible for the increase in net NO) sub(3)[super]- production rate. Thus the increase in N uptake and herbage yield on the cattle slurry treatments could be related to NO sub(3[super]- rather than NH) sub(4)[super]+ production. The [super]15N tracing study was successful in revealing process-specific changes in the N cycle in relationship to long-term repeated amendments.
机译：就牧草产量N而言，研究了在38年间以50、100或200 m3·3 ha·-1 yr·-1的年施用量重复施用化肥或牛粪浆的影响。永久草地场所的土壤吸收和土壤总氮动态。尽管合成肥料对牧草产量和氮素吸收具有持续和恒定的影响，但提高牛粪肥的施用量在整个观察期内线性增加了牧草产量和氮素的吸收。牛粪浆施用量为推荐比例的两倍和四倍（50 m3·3 ha-1·yr-1，170 kg N·ha-1），增加了46％和78％的氮吸收，分别在38年后。为了解释长期效果，进行了一项超15N示踪研究，以确定在各种处理下N动态的潜在变化。该分析模型评估了特定过程的速率，例如来自两个有机氮库的矿化率，以及来自NH sub（4super +）和有机氮氧化的硝化作用，所有处理的总矿化度均相似。在未施肥的对照处理中，超过90％的NH）sub（4）+产量与难处理的有机N的矿化有关，牛粪处理中发生了从不稳定的有机N向主要矿化的转变，并且该比例随着浆料施用率的增加而增加。此外，顽固性有机N的氧化从对照处理中主要的NH亚（4 ^ +）生成物转移到了牛粪浆处理中主要的NO）亚（3）^-过度生成（异养硝化）。 。异养硝化和NH sub（4 ^ +）氧化随牛粪浆施用量的增加而增加的主要原因是净NO）sub（3）^-产生率的增加。因此，在牛粪处理中氮吸收和牧草产量的增加可能与NO sub（3super）而非NHsub（4）super的生产有关。 15N示踪研究成功地揭示了N循环中与长期重复修正有关的过程特定变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号