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Synergistic effect of Si and K in improving the growth,ion distribution and partitioning of Lolium perenne *** saline-alkali stress

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Journal of Integrative Agriculture 2021年第6期20卷 1660-1673页

作者： FAN Yuan SHEN Wu-yan pino vanessa CHENG Fang-qin Institute of Resources and Environmental Engineering Shanxi University/State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste ResourcesTaiyuan 030006P.R.China Sydney Institute of Agriculture School of Life and Environmental SciencesThe University of SydneyNSW 2006Australia

The application of Si or K has proven to be beneficial for the growth of plants under saline-alkali stress. However, the synergistic effect of Si and K in improving the growth, ion distribution, and partitioning in Lolium perenne L. under saline-alkali stress remains unclear. In this study, the growth characteristics and ion-selective absorption of ryegrass(Lolium perenne L.) exposed to different levels of saline-alkali stress were evaluated. The growth parameters of ryegrass were significantly improved when Si was applied by itself or coupled with K under low saline-alkali stress. Under a high saline-alkali level, only simultaneous application of Si and K could significantly improve the growth of ryegrass. When Si and K were applied together, the K^(+)/Na^(+) and Ca^(2+)/Na^(+) ratios in root, stem, and leaf of ryegrass were maximally improved as compared to the individual treatments and control. The K^(+) and Ca^(2+) concentrations in the vacuole, cell wall, and organelle of leaf were increased dramatically. This improvement was due to the ability of applied ions to compete with Na^(+), allowing the plant to maintain osmotic potential and leaf water content. The concentration of Na^(+) was significantly reduced when Si and K were applied and mainly concentrated in the soluble fraction and cell wall. The Si concentration in ryegrass increased markedly by the combined application of Si and K, and most of it was accumulated in the cell wall and soluble fraction, which could help in chlorophyll synthesis, reduce membrane injury, and increase water absorption under saline-alkali stress. This study emphasized the advantage of Si and/or K on the growth of plants under different saline-alkaline levels and provided a guide for the production of Si-K fertilizer and its application in saline-alkali soil.

关键词： saline-alkali stress Si K ryegrass plants K+/Na+ compartmentation

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Soil bacterial depth distribution controlled by soil orders and soil forms

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Soil Ecology Letters 2022年第1期4卷 69-77页

作者： Peipei Xue Alex B.McBratney Budiman Minasny Tony O'Donnell vanessa pino Mario Fajardo Wartini Ng Neil Wilson Rosalind Deaker School of Life and Environmental Sciences The University of SydneyNSW 2015Australia Sydney Institute of Agriculture NSW 2006Australia Faculty of Science The University of Western AustraliaWA 6009Australia

Human disturbances to soils can lead to dramatic changes in soil physical,chemical,and biological *** influence of agricultural activities on the bacterial community over different orders of soil and at depth is still not well *** used the concept of genoform and phenoform to investigate the vertical(down to 1 m depth)soil bacterial community structure in paired genosoils(undisturbed forests)and phenosoils(cultivated vineyards)in different soil *** study was conducted in the Hunter Valley area,New South Wales,Australia,where samples were collected from 3 different soil orders(Calcarosol,Chromosol,and Kurosol),and each soil order consists of a pair of genosoil and *** bacterial community structure was analyzed using highthroughput sequencing of 16S *** showed that bacterial-diversity decreased with depth in phenosoils,however,the trend is less obvious in genoform *** diversity was greater in phenosoils than genosoils,but the trend was reversed in ***,cropping not only affected topsoil bacteria community but also decreased its diversity in the *** community in topsoils was influenced by both soil orders and soil forms,however,in subsoils it was more impacted by soil *** Analysis of Principal Coordinates revealed that cropping increased the similarity of bacterial structures of different soil *** study highlighted the strong influence of agricultural activities on soil microbial distribution with depth,which is controlled by soil order.

关键词： Bacterial distribution Soil depth Soil forms/land use Genosoil and phenosoil Soil type/soil order

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