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An improved nitrogen difference method for estimating biological nitrogen fixation in legume-based intercropping systems

文献类型： 外文期刊

作者： Yu, Chang-Bing 1 ; Li, Yu-Ying 1 ; Li, Chun-Jie 1 ; Sun, Jian-Hao 2 ; He, X. H. 3 ; Zhang, Fu-Suo 1 ; Li, Long 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China

2.Gansu Acad Agr Sci, Inst Soils & Fertilizers, Lanzhou 730070, Peoples R China

3.Univ Western Australia, Sch Plant Biol, Perth, WA 6009, Australia

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

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收录情况： SCI

摘要： The nitrogen difference method (NDM) for quantifying N fixation, based on the same amount of soil N exploited by N-fixing and non-N-fixing plant, may not be suitable to plants with different root traits. We tested the reliability of NDM in legume-based intercropping systems by two field experiments in Northwest China. In experiment 1, faba bean (Vicia faba), pea (Pisum sativum), and soybean (Glycine max) grew solely or intercropped with maize (Zea mays) with two N application rates (0, 225 kg hap#). The biomass of faba bean, pea, and maize was significantly increased, whereas that of soybean was decreased when intercropped than solely grown. Aggressivity analyses demonstrate greater N competition ability of faba bean and pea, but not soybean, than maize. An improved NDM (INDM) could mitigate these effects: [graphic removed] , where x and 1x are planting area of legume and non-legume in the intercropping system. Compared to traditional NDM (TNDM, [graphic removed] ), %N dfa (N derived from air) by INDM was decreased by 54.3% and 39.8% for faba bean, 44.7% and 5.0% for pea, but increased by 113.5% and 191.0% for soybean at the two N application rates, indicating different %N dfa quantifications between the two methods. In experiment 2, %N dfa of sole or intercropped faba bean was quantified by TNDM, INDM, and p#eN natural abundance method (NA). The %N dfa only by INDM correlated significantly with that from NA. Both interspecific root interactions and N loss affect %N dfa estimation. Our results suggested that INDM could be more suitable than TNDM for quantifying %N dfa of a N-fixing plant in intercropping systems.

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