Plastic Mulch Stimulates Nitrogen Mineralization in Urea-Amended Soils in a Semiarid Environment
Plastic Mulch Stimulates Nitrogen Mineralization in Urea-Amended Soils in a Semiarid Environment
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DOI：
10.2134/agronj14.0538
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发表时间：
2015-05-01
期刊：
影响因子：
2.1
通讯作者：
Li, Feng-Min
中科院分区：
文献类型：
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作者：
Hai, Long;Li, Xiao Gang;Li, Feng-Min
土壤氮矿化是设计适当的氮管理策略的关键，但很少在塑料覆盖农田中进行研究。在有和没有玉米（Zea mays L.）的尿素修正沟垄小区中，我们评估了塑料覆盖对氮矿化的影响。种植在半干旱的雨水灌溉的网站，中国。在覆盖处理中，透明膜覆盖所有土壤表面，在种植处理中，玉米播种在沟中。覆盖增加白天土壤温度在0至15厘米的整个赛季没有玉米，但只有在幼苗和伸长阶段与玉米，相比，没有覆盖。与2011年无覆盖相比，覆盖增加了整个季节的土壤水分，但仅在玉米生长初期。然而，覆盖对土壤水分的影响是独立的玉米在2012年的存在。2011年和2012年，与非覆盖土壤相比，覆盖土壤的氮矿化速率在整个季节都有所增加。到收获时，2011年覆盖土壤中的总氮矿化量平均为112 kg ha（-1），而非覆盖土壤中的固定氮量为54 kg ha（-1）; 2012年，覆盖土壤中的总氮矿化量为348 kg ha（-1），而非覆盖土壤中的总氮矿化量为116 kg ha（-1）。与无玉米相比，玉米增加了抽雄和吐丝期的氮矿化。然而，覆盖对氮矿化速率的影响与玉米的存在无关。我们的结论是，塑料覆盖增加氮矿化尿素修正土壤通过增加土壤温度和水分。
Soil N mineralization is critical for designing appropriate N management strategies, though it has been seldom studied in plastic-mulched croplands. We evaluated plastic mulch effect on N mineralization in urea-amended furrow-ridge plots with and without maize (Zea mays L.) planting at a semiarid rain-fed site, China. Clear film covered all soil surfaces in the mulched treatments and maize was seeded in furrows in the cropped treatments. Mulch increased daytime soil temperature in the 0 to 15 cm throughout the season without maize but only in the seedling and elongation stages with maize, compared with no mulch. Mulch increased soil moisture in the whole season without maize but only in the early growth with maize, compared with no mulch in 2011. However, the mulch influence on soil moisture was independent on the presence of maize in 2012. Compared with non-mulched soils, N mineralization rate increased in mulched soils throughout the season in 2011 and 2012. By harvest, in 2011 total N mineralized averaged 112 kg ha(-1) in mulched soils, contrasting to 54 kg N ha(-1) immobilized in non-mulched soils; in 2012 total N mineralization was 348 kg ha(-1) in mulched soils whereas it was 116 kg ha(-1) in non-mulched soils. Maize increased N mineralization in the tasseling and silking stages compared with no maize. However, the mulch effect on N mineralization rate was independent on the presence of maize. We concluded that plastic mulch increased N mineralization in urea-amended soils by increasing soil temperature and moisture.