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首页> 外文期刊>European Journal of Agronomy >Response of giant reed (Arundo donax L.) to nitrogen fertilization and soil water availability in semi-arid Mediterranean environment
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Response of giant reed (Arundo donax L.) to nitrogen fertilization and soil water availability in semi-arid Mediterranean environment

机译：地中海半干旱环境下巨型芦苇对氮肥和土壤水分的响应

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摘要

The aim of the present work was to evaluate the effect of soil water availability and nitrogen fertilization on yield, water use efficiency and agronomic nitrogen use efficiency of giant reed (Arundo donax L) over four-year field experiment. After the year of establishment, three levels for each factor were studied in the following three years: 10 (irrigation only during the year of establishment), I-1 (50% ETm restitution) and I-2 (100% ETm restitution); N-0 (0 kg N ha(-1)), N-1 (60 kg N ha(-1)) and N-2 (120 kg N ha(-1)). Irrigation and nitrogen effects resulted significant for stem height and leaf area index (LAI) before senescence, while no differences were observed for stem density and LAI at harvest. Aboveground biomass dry matter (DM) yield increased following the year of establishment in all irrigation and N fertilization treatments. It was always the highest in I2N2 (18.3, 28.8 and 28.9 t DM ha(-1) at second, third and fourth year growing season, respectively). The lowest values were observed in I0N0 (11.0, 13.4 and 12.9 t DM ha(-1), respectively). Water use efficiency (WUE) was significantly higher in the most stressed irrigation treatment (I-0), decreasing in the intermediate (I-1) and further in the highest irrigation treatment (I-2). N fertilization lead to greater values of WUE in all irrigation treatment. The effect of N fertilization on agronomic nitrogen use efficiency (NUE) was significant only at the first and second growing season. Giant reed was able to uptake water at 160-180 cm soil depth when irrigation was applied, while up to 140-160 cm under water stress condition. Giant reed appeared to be particularly suited to semi-arid Mediterranean environments, showing high yields even in absence of agro-input supply
机译：本工作的目的是在四年的田间试验中，评估土壤水分供应和氮肥对巨型芦苇（Arundo donax L）的产量，水分利用效率和农艺氮利用效率的影响。在建立年份之后，在接下来的三年中研究了每种因子的三个级别：10（仅在建立年份灌溉），I-1（50％ETm归还）和I-2（100％ETm归还）; N-0（0 kg N ha（-1）），N-1（60 kg N ha（-1））和N-2（120 kg N ha（-1））。灌溉和施氮对衰老前的茎高和叶面积指数（LAI）产生显着影响，而收获时茎密度和LAI均未观察到差异。在所有灌溉和施氮处理措施建立之后，地上生物量干物质（DM）产量均增加。它始终是I2N2中最高的（分别在第二，第三和第四年生长期分别为18.3、28.8和28.9 t DM ha（-1））。在I0N0中观察到最低值（分别为11.0、13.4和12.9 t DM ha（-1））。在压力最大的灌溉处理（I-0）中，水分利用效率（WUE）显着较高，在中间（I-1）降低，而在最高灌溉处理（I-2）中进一步降低。在所有灌溉处理中，氮肥会导致更高的WUE值。氮肥对农艺氮利用效率（NUE）的影响仅在第一个和第二个生长季节才有意义。进行灌溉时，巨型芦苇能够吸收土壤深度为160-180 cm的水分，而在水分胁迫条件下，其最大吸收量为140-160 cm。巨型芦苇似乎特别适合于半干旱的地中海环境，即使在没有农业投入物供应的情况下也显示出高产量

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