当前位置: X-MOL 学术Soil Tillage Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Changes in N supply pathways under different long-term fertilization regimes in Northeast China
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2020-03-18 , DOI: 10.1016/j.still.2020.104609
Qiang Ma , Shuailin Li , Zhiqiang Xu , Shaobo Fan , Zhuqing Xia , Changrui Zhou , Mengmeng Zhu , Wantai Yu

Different long-term fertilization regimes probably influence N supplying capacity and N cycling processes in soils. However, the effects of fertilization regimes on the pathways of N retention and supply and the impacts of these pathways on crop N uptake remain undocumented. In this study, the contributions of different pathways to N retention and supply were investigated on the basis of a long-term experiment that began in 1990, including six treatments: no fertilizer (CK), recycled manure (M), N and P fertilizers (NP), P and K fertilizers (PK), N, P and K fertilizers (NPK), and NPK fertilizers with recycled manure (NPKM). In the maize growth season, soil microbial mineralization–immobilization turnover (MIT) was the primary driving force of N transformation under treatments without synthetic N. Conversely, NH4+ fixation and release by soil clay minerals prominently regulate N retention and supply under treatments with synthetic N. In general, soil microbial biomass N (SMBN) mineralization and fixed NH4+ release accounted for 51 % of the variation in crop N uptake and the contribution of the latter to crop N uptake was 2-fold greater than that of the former. The synchrony between crop N uptake and fixed NH4+release was higher than that between crop N uptake and SMBN mineralization. Therefore, the fixed NH4+ pool was important in synthetic N regulation at a short or medium temporal scale, especially for soils with high 2:1 clay mineral content. By contrast, MIT dominated N cycling at a long temporal scale. Clarification of the pathways of N retention and supply can provide helpful implications for optimizing N fertilizer management and enhancing the synchrony between crop N demand and soil N supply.



中文翻译:

东北地区不同长期施肥制度下氮素供应途径的变化

不同的长期施肥制度可能会影响土壤中的氮素供应能力和氮素循环过程。但是,施肥方式对氮素保持和供应途径的影响以及这些途径对作物氮素吸收的影响仍然没有记载。在这项研究中,以1990年开始的长期试验为基础,研究了不同途径对氮素保持和供应的贡献,包括六种处理方法:不施肥(CK),循环肥料(M),氮肥和磷肥(NP),P和K肥料(PK),N,P和K肥料(NPK)以及带再生肥料的NPK肥料(NPKM)。在玉米生长期,土壤微生物矿化-固定化转化率(MIT)是无合成氮处理下氮转化的主要驱动力。相反,NH 4在合成氮处理下,土壤黏土矿物对+的固定和释放能显着调节氮的保持和供应。通常,土壤微生物生物量氮(SMBN)矿化和固定的NH 4 +占作物吸收氮和氮的变化的51%。后者对作物吸收氮的贡献是前者的2倍。作物吸收氮与固定NH 4 +释放之间的同步性高于作物吸收氮与SMBN矿化之间的同步性。因此,固定NH 4 +在短期或中期的时间尺度上,碳库对于合成氮的调控非常重要,特别是对于粘土矿物含量为2:1的土壤。相比之下,MIT在较长的时间尺度上主导着N循环。氮素保留和供应途径的阐明可为优化氮肥管理和增强作物氮素需求与土壤氮素供应之间的同步性提供有益的启示。

更新日期:2020-03-18
down
wechat
bug