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首页> 外文期刊>Ecosphere >Gross nitrogen transformation rates in semiarid tropical soils under different salinity and vegetation conditions
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Gross nitrogen transformation rates in semiarid tropical soils under different salinity and vegetation conditions

机译：不同盐度和植被条件下半干旱热带土壤的总氮转化率

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摘要

Exacerbated inundations and saltwater intrusions due to sea‐level rise can significantly alter the ecology of low‐lying coastal drylands by affecting their nutrient cycling and productivity. During the present study, controls on production and consumption of nitrogen in soils of semiarid tropical climate with different levels of vegetation–salinity–moisture condition were investigated using~(15)N isotope dilution experiments. For this purpose, soils were collected from five land types including two in salt flat and one each in grassland (GL), wetland (WL), and an agricultural field. Soils with no vegetation, high salinity, and high moisture (salt flats) showed significant decline in gross production of nitrogen (mineralization rate: 0.21?±?0.10?mg N·kg~(?1)·d~(?1); nitrification rate: 0.27?±?0.17?mg N·kg~(?1)·d~(?1)) compared to soils with vegetation, low salinity, and low moisture (GL, WL, and agricultural) (mineralization rate: 2.47?±?1.74?mg N·kg~(?1)·d~(?1); nitrification rate: 1.43?±?1.30?mg N·kg~(?1)·d~(?1)). Backward stepwise regression analysis of the results indicated salinity to be the most important factor controlling nitrogen transformation rates. It is likely that soils undergoing frequent seawater exposure or excessive evaporation may experience slowdown in nitrogen cycling due to salinization leading to reduced nutrient production and consumption. Due to climate change, the areal extent of coastal drylands undergoing such decline in nutrient production is likely to increase, eventually leading to loss of productivity and desertification.
机译：通过影响其营养循环和生产力，由于海平面上升引起的淹没和咸水入侵可能会显着改变低洼沿海旱地的生态。在本研究期间，使用〜（15）n同位素稀释实验，研究了具有不同植被 - 盐度水分状况的半干旱热带气候土壤中生产和消费的对氮的控制。为此目的，土壤从五种土地类型收集，包括两个在盐平的两种土地类型，每个草原（GL），湿地（WL）和农业领域。没有植被，高盐度和高水分（盐平面）的土壤表现出氮总产量的显着下降（矿化率：0.21？±0.10Ω·mg n·kg〜（？1）·d〜（？1）;与植被，低盐度和低水分（GL，WL和农业）的土壤相比，硝化率：0.27？±kg〜（α1）·d〜（？1））（GL，WL和农业）（矿化率： 2.47？±1.74？mg n·kg〜（？1）·d〜（？1）;硝化速率：1.43？±？1.30？mg n·kg〜（？1）·d〜（？1））。向后逐步回归分析结果表明盐度是控制氮转化率最重要的因素。由于盐渍化导致营养产生和消耗降低，可能会频繁发生海水暴露或过度蒸发的土壤可能会经历氮循环的放缓。由于气候变化，沿海旱地的面积范围正在进行这种营养生产下降可能会增加，最终导致生产力和荒漠化丧失。

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