...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nutrient Cycling in Agroecosystems >Simulating the effect of long-term fertilization on maize yield and soil C/N dynamics in northeastern China using DSSAT and CENTURY-based soil model
【24h】

Simulating the effect of long-term fertilization on maize yield and soil C/N dynamics in northeastern China using DSSAT and CENTURY-based soil model

机译：利用DSSAT和基于CENTURY的土壤模型模拟长期施肥对东北地区玉米产量和土壤碳氮动态的影响

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

Simulation models are being regarded as an important tool to simulate crop growth, soil nutrient dynamics and soil carbon sequestration and fast use of the embedded knowledge of crop-soil processes. The Decision Support Systems for Agrotechnology Transfer (DSSAT) model was used to simulate long-term continuous maize growth from 1990 to 2007 in Gongzhuling, Northeast China. Three levels of N treatments were simulated, including: (1) no N (N0), (2) 165 kg N ha−1 from synthetic fertilizer (N165) and (3) 50 kg N ha−1 from synthetic fertilizer plus 115 kg N ha−1 from farmyard manure (N165M). Both measured and simulated results showed that the maize yield was significantly lower in the N0 treatment. The measured maize yield was higher in N165M than N165 treatments after 2003. The maize yield was also affected by the weather, especially during drought years. The simulated soil organic C (SOC) content was in good agreement with the measured data in the 0–30 cm depth for all treatments. The SOC density in the 0–30 cm depth decreased by 4,393 kg C ha−1 (18 %) in the N0 treatment and 4,186 kg C ha−1 (17 %) in the N165 treatment, while it increased by 13,628 kg C ha−1 (54 %) in the N165M treatment during 1990–2007, indicating that the combination of inorganic fertilizer and organic manure improved soil quality after 27 years of organic amendment from 1980. Soil mineral N levels were significantly higher in the N165 treatment just before planting (averaged 289 kg N ha−1), associated with more soil N leaching during the growing seasons (24–155 kg N ha−1) in some wet years, while soil mineral N levels were much lower in both the N0 (averaged 52 kg N ha−1) and N165M treatments (averaged 54 kg N ha−1) associated with less N leaching (<10 kg N ha−1) compared with the N165 treatment. This indicated that the use of farmyard manure increased the soil organic matter and immobilized mineral N. The model results further indicated that complete crop residue removal from the field after harvest was a main reason for the decline of the SOC in the N165 treatment, suggesting that crop residue should be left on the soil to maintain the SOC balance and promote sustainable agriculture. Thus, we conclude that the DSSAT CENTURY-based module is a useful tool to simulate soil nitrogen dynamics and predict soil organic carbon sequestration in long-term field conditions.
机译：模拟模型被认为是模拟作物生长，土壤养分动态和土壤碳固存以及快速利用作物土壤过程的嵌入式知识的重要工具。利用农业技术转移决策支持系统（DSSAT）模型来模拟1990年至2007年中国东北公主岭的玉米长期连续增长。模拟了三个水平的氮素处理，包括：（1）无氮（N0），（2）合成肥料（N165）165千克N ha-1和（3）合成肥料+ 115千克50千克Nha-1农田肥料中的Nha-1（N165M）。测量和模拟结果均表明，在N0处理下，玉米单产显着降低。在2003年之后，N165M测得的玉米单产高于N165处理。玉米的单产还受到天气的影响，尤其是在干旱年份。所有处理的模拟土壤有机碳（SOC）含量与0-30 cm深度的实测数据吻合良好。在N0处理中，0-30 cm深度的SOC密度降低了4,393 kg C ha-1（18％），在N165处理中的SOC密度降低了4,186 kg C ha-1（17％），但增加了13,628 kg C ha在1990-2007年间，N165M处理的结果为-1（54％），这表明从1980年起经过27年的有机改良后，无机肥料和有机肥料的结合改善了土壤质量。种植（平均289 kg N·ha-1），在某些湿润年份的生长季节（24–155 kg N·ha-1）与更多的土壤N淋失相关，而两个N0的土壤矿质氮水平都低得多（平均52公斤N ha-1）和N165M处理（平均54公斤N ha-1）与N165处理相比具有更少的氮浸出（<10公斤N ha-1）。这表明使用农家肥增加了土壤有机质和固定化的矿质氮。模型结果进一步表明，收获后田间彻底清除农作物残余物是N165处理SOC下降的主要原因，这表明作物残渣应留在土壤上，以保持有机碳平衡并促进可持续农业。因此，我们得出结论，基于DSSAT CENTURY的模块是模拟土壤氮动态并预测长期田间条件下土壤有机碳固存的有用工具。

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