水稻根瘤菌在潮湿和干燥交替条件下的发展

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Md. Dhin Islam, Adam H. Price, Paul D. Hallett
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引用次数: 0

摘要

干湿交替灌溉(AWD)可为水稻种植节约大量用水。通过在 AWD 条件下反复润湿和干燥土壤,根圈的孔隙结构可能会比淹水水稻更为突出。这可能会影响根系的生长和资源的捕获,但迄今为止,人们还没有探索过水稻根圈在全天候干旱条件下的物理结构和行为。在一项受控玻璃温室实验中,两种不同质地的土壤被用于分离根瘤,用网眼将根区与块状土壤分开。为了模拟水田,根茎的顶部填满了积水土壤,积水层下面是筛过的土壤层。根区物理性质的测量结合使用了高分辨率 X 射线 CT 成像(孔隙结构)、微型渗透仪(水文)和小型压头(机械)。与连续灌溉(CF)相比,AWD 灌溉下的土壤大孔率高出 46%,孔隙连通性高出 20%。与块状土壤相比,AWD 或 CF 灌溉下的根区土壤具有更大的大孔隙度、吸水率和机械硬度。在根区,AWD 比 CF 增加了约 36% 的吸水率,但不影响机械硬度。我们的研究结果表明,AWD 与水稻根系相互作用,可以通过更稳定、更大和连接更好的孔隙系统促进更有效的水分传输。这项研究的结果还表明,AWD 对土壤物理的改变可以提高水稻生产系统的资源利用率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Rhizosphere development under alternate wetting and drying in puddled paddy rice

Rhizosphere development under alternate wetting and drying in puddled paddy rice

Alternate wetting and drying (AWD) irrigation can save large amounts of water in rice cultivation. By repeatedly wetting and drying the soil under AWD, accentuated pore structure of the rhizosphere compared to flooded rice may occur. This could affect root growth and resource capture, but to date the physical structure and behaviour of the rhizosphere of rice under AWD has not been explored. In a controlled glasshouse experiment, two different textured soils were used in split rhizotrunks to separate a root-zone from bulk soil using mesh. To mimic a paddy field, the top of the rhizotrunk was filled with puddled soil and below the puddled layer there was a sieved soil layer. Root-zone physical properties were measured using a combination of high resolution X-ray CT imaging (pore structure), a miniaturised infiltrometer (hydrological) and a small indenter (mechanical). Soil under AWD irrigation had 46% greater macroporosity and 20% more pore connectivity compared to continuous flooding (CF). Compared to the bulk soil, root-zone soil under AWD or CF had greater macroporosity, water sorptivity and mechanical hardness. In the root-zone, AWD compared to CF increased the rate of water absorption by around 36%, but did not affect mechanical hardness. Our results suggest AWD interacting with rice roots could promote more effective water transmission through a more stable, larger and better-connected pore system. The results of this study also suggest that soil physical changes by AWD could improve the utilization of resources in a rice production system.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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