Dynamics of plant nutrient uptake as affected by biopore-associated root growth in arable subsoil
Dynamics of plant nutrient uptake as affected by biopore-associated root growth in arable subsoil
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DOI：
10.1007/s11104-016-3150-4
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发表时间：
2017-06-01
期刊：
影响因子：
4.9
通讯作者：
Koepke, Ulrich
中科院分区：
文献类型：
--
作者：
Han, Eusun;Kautz, Timo;Koepke, Ulrich
土壤生物孔有利于耕地底土中的根系生长，从而提高资源获取潜力。我们的目的是考虑不同的生物孔径类别、根系特征和作物生长参数，确定土壤生物孔与两种冬季作物在田间条件下的动态关系。具有优势主根系统的菊苣和具有有限主根系统的高羊茅作为前茬作物连续两年种植。在45 cm土深处测量直径大于2 mm和小于2 mm的土壤生物孔密度。对大麦和油菜根进行了破坏性取样调查。在整个生长季节测定了以下作物的芽生物量产量、养分吸收和最终产量。在菊苣（23％）或高羊茅（20％）预作后观察到较大或小型双孔菌的比例分别较高。菊苣后后续作物的平均根直径和根干质量比高羊茅高 11% 和 15%。与高羊茅-大麦处理相比，在开花期菊苣-大麦处理积累的钾多了10%。在果实发育阶段，与菊苣相比，高羊茅后双低油菜籽的磷吸收量更高（7%）。我们的结果表明，土壤生物孔改变导致的底土异质化与植物根系生长和作物整体性能相关。然而，其影响取决于生物孔径类别、根部特征和作物种类。未来必须开发能够量化生物孔-根-芽过程的直接方法、对土壤圈的详细研究、用于检测响应生物孔系统的遗传变异的根表型分析。
Soil biopores facilitate root growth in arable subsoil, thus improve resource acquisition potential. We aimed at determining the dynamic relationship between soil biopores and performance of two winter crops in field condition considering different biopore size classes, root characteristics and crop growth parameters.Chicory with dominant taproot system and tall fescue with limited taproots were grown for two consecutive years as precrops. Density of soil biopores larger than 2 mm and smaller than 2 mm in diameter was measured at 45 cm of soil depth. Destructive samplings were carried out for investigation on following barley and canola roots. Shoot biomass production, nutrient uptake and final yield of the following crops were determined throughout the growth seasons.Higher shares of large or small-sized bipoores were observed after chicory (23 %) or tall fescue (20 %) precrops, respectively. On average root diameter and root dry mass of following crops were greater by 11 and 15 % after chicory than tall fescue. At anthesis chicory-barley treatment accumulated 10 % more K in comparison to tall fescue-barley treatment. P uptake of canola was greater (7 %) after tall fescue compared with chicory at the stage of fruit development.Our results suggest that the subsoil heterogenization by altered soil biopores hold relevance for plant root growth and overall crop performance. However, the effects depended on biopore size classes, root characteristics and crop species. Development of direct methods that can quantify biopore-root-shoot processes, detailed investigation on drilosphere, root phenotyping for detection of the genetic variation in response to biopore systems have to be followed in the future.