Impact of nitrogen fertilization on soil respiration and net ecosystem production in maize
Impact of nitrogen fertilization on soil respiration and net ecosystem production in maize
复制标题
氮肥对玉米土壤呼吸和净生态系统产量的影响
DOI：
10.17221/217/2018-pse
复制
发表时间：
2018-01-01
影响因子：
2.4
通讯作者：
Xie, Junhong
中科院分区：
文献类型：
--
作者：
Lamptey, Shirley;Li, Lingling;Xie, Junhong
半干旱地区的农业经常面临氮（N）过度使用、土壤水不足和碳排放量大的挑战，从而威胁到可持续性。通过田间试验研究氮肥水平（N-0 -0、N-100 - 100、N-200 - 200、N-300 - 300 kg N/ha）对土壤水动态、土壤呼吸（Rs）、净生态系统生产（NEP）和生物量产量的影响。与 N-300 和 N-200 土壤相比，零氮土壤的 Rs 分别降低了 23% 和 16%。然而，与 N-0 相比，N-300 下的生物量产量最高，因此与 N-0 相比，净初级生产力增加了 89%，NEP 增加了 101%。与 N-0 相比，N-200 在较小程度上将净初级生产力提高了 69%，将净生态系统生产力提高了 79%。与 N-100 和 N-0 相比，N-300 下的谷物产量最高，因此与 N-0、N-100 和 N-200 处理相比，N-300 下的碳排放效率 (CEE) 分别提高了 53%、39% 和 3%。 200 公斤氮/公顷似乎有潜力用于提高产量和提高 CEE。
Agriculture in the semi-arid is often challenged by overuse of nitrogen (N), inadequate soil water and heavy carbon emissions thereby threatening sustainability. Field experiments were conducted to investigate the effect of nitrogen fertilization levels (N-0 -0, N-100 - 100, N-200 - 200, N-300 - 300 kg N/ha) on soil water dynamics, soil respiration (Rs), net ecosystem production (NEP), and biomass yields. Zero nitrogen soils decreased Rs by 23% and 16% compared to N-300 and N-200 soils, respectively. However, biomass yield was greatest under N-300 compared with N-0, which therefore translated into increased net primary production by 89% and NEP by 101% compared to N-0. To a lesser extent, N-200 increased net primary production by 69% and net ecosystem production by 79% compared to N-0. Grain yields were greatest under N-300 compared with N-100 and N-0, which therefore translated into increased carbon emission efficiency (CEE) by 53, 39 and 3% under N-300 compared to N-0, N-100 and N-200 treatments, respectively. There appears potential for 200 kg N/ha to be used to improve yield and increase CEE.