High morphological and physiological plasticity of wheat roots is conducive to higher competitive ability of wheat than maize in intercropping systems
High morphological and physiological plasticity of wheat roots is conducive to higher competitive ability of wheat than maize in intercropping systems
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小麦根系高度的形态和生理可塑性有利于小麦在间作系统中比玉米具有更高的竞争能力
DOI：
10.1007/s11104-015-2654-7
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发表时间：
2015-12-01
期刊：
影响因子：
4.9
通讯作者：
Li, Long
中科院分区：
文献类型：
--
作者：
Liu, Yi-Xiang;Zhang, Wei-Ping;Li, Long
很少有研究涉及根系生理可塑性对种间相互作用的影响。为研究小麦/玉米间作条件下小麦和玉米根系的可塑性及其对施氮水平和相邻物种的响应，在小麦/玉米间作条件下，采用螺旋钻法对小麦和玉米根系进行了3次取样。结果表明，间作小麦和玉米根系的根长密度（根长密度）随施氮水平的增加而增加，根长密度（根长密度）随施氮水平的增加而增加，根长密度（根长密度）随施氮水平的增加而增加，根长密度（根长密度）随施氮水平的增加而增加。间作玉米的根系分布对施氮水平的敏感性较低。此外，本发明还提供了一种方法，小麦有54.5%（38-69天）-375%（0-37 d）间作玉米比单作玉米单位根长吸氮速率（NH_4 ~+）高，但间作玉米比单作玉米低58.3（0-37天）在相同的施氮量下，玉米的氮素利用率与单作玉米的氮素利用率相近。我们的研究结果表明，地下资源有利于RLD的可塑性，侧根分布对土壤N的响应，以及邻近物种的N吸收效率。
Few studies have addressed the effects of root physiological plasticity on interspecific interactions. The present study aimed to investigate the plasticity of wheat and maize roots and their responses to nitrogen (N) application rates and neighboring species in wheat/maize intercropping.The roots of wheat and maize were sampled three times by auger after about 90 days of co-growth in the intercropping treatment with five levels of N application and sole crops at one N application rate.Intercropped wheat altered its root length density (RLD) and lateral root distribution with different N application regimes, while lateral root distribution of intercropped maize was less sensitive to N application regimes. In addition, wheat had a 54.5 % (38-69 days) -375 % (0-37 days) higher N uptake rate per unit root length (NURl) when intercropped with maize compared with sole cropping but intercropped maize had either 58.3 % lower (0-37 days) or similar NURl than did sole cropped maize at the same N application rate.Our findings suggest that the competitive ability of the plant species for underground resources is conducive to plasticities in RLD, lateral root distribution in response to soil N, and N uptake efficiency to neighboring species.