Multi-year vertical and life cycle impacts of C-N management on soil moisture regimes
Multi-year vertical and life cycle impacts of C-N management on soil moisture regimes
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DOI：
10.1016/j.agwat.2023.108581
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发表时间：
2023-12
影响因子：
6.7
通讯作者：
Jie Zhu;Shanghong Chen;Qingwen Zhang;Xurong Mei
中科院分区：
文献类型：
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作者：
Jie Zhu;Shanghong Chen;Qingwen Zhang;Xurong Mei
了解碳氮管理措施对土壤含水量（SMC）的长期影响对于可持续农业至关重要，特别是在减轻季节性干旱和暴雨限制方面。进行了多年（2014-2018年）现场实验，进行了高频测量并考虑了整个生命周期以及多个垂直层（0-100厘米，间隔20厘米）。试验采用裂区设计，以氮肥（N）投入量（N80%和N60%）为整区因子，碳（C）处理（Corg=有机肥，Cstraw=秸秆覆盖全还田，Cinteg= Corg+ Cstraw）为裂区因子。结果表明，Cinteg处理导致五年平均SMC的最大增加（比Corg高约6.60%），其次是Cstraw处理。此外，与N80%处理相比，N60%处理导致SMC显著更高，在整个生命周期内增加1.71-4.12%。此外，研究还表明，在所有处理中，平均SMC在拔节-抽穗期增加最多，在抽穗-成熟期增加最少。垂直结果表明，与深层（80-100 cm）相比，所有处理的浅层（0-20 cm，20-40 cm）的水分保持效率更高。研究建议采用综合碳氮管理措施，考虑生命周期和垂直层，以优化土壤水分含量。它为优化土壤水分管理策略、缓解季节性干旱、提高用水效率和促进可持续农业实践提供了宝贵的见解。
Understanding the long-term impact of C-N management practices on soil moisture content (SMC) is crucial for sustainable agriculture, particularly in mitigating seasonal droughts and storm rainfall constraints. A multi-year (2014–2018) field experiment was conducted, with high-frequency measurements and consideration of a full life cycle, as well as multiple vertical layers (0–100 cm, with intervals of 20 cm). Treatments were arranged in a split plot design with nitrogen (N) fertilizer input (N80%and N60%) as the whole-plot factor, and Carbon (C) treatments (Corg=organic fertilizer, Cstraw=straw mulching and full returning, Cinteg= Corg+ Cstraw) were considered as the split-plot factor. The results demonstrated the Cintegtreatment resulted in the highest increase in the five-year averaged SMC (approximately 6.60% greater than Corg), followed by the Cstrawtreatment. Additionally, the N60% treatment resulted in significantly higher SMC compared to the N80% treatment, with a range of 1.71–4.12% increase across the life cycle. Furthermore, the research revealed that the average SMC increased the most during the jointing-heading period and the least during the heading-maturity period across all treatments. The vertical results indicated a higher efficiency in water retention within the shallow layers (0–20 cm, 20–40 cm) compared to the deeper layers (80–100 cm) for all treatments. The study recommends adopting integrated C-N management practices, considering life cycle periods and vertical layers, to optimize soil moisture content. It offers valuable insights for optimizing soil moisture management strategies, alleviating seasonal droughts, enhancing water-use efficiency, and fostering sustainable agricultural practices.