| 玉米根鞘改变土壤粒径及养分有效性 |
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| 引用本文： | MA Wei,LI Xue-Xian,LI Chun-Jian. 玉米根鞘改变土壤粒径及养分有效性[J]. 土壤圈, 2011, 21(4): 483-490 |
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| 作者姓名： | MA Wei LI Xue-Xian LI Chun-Jian |
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| 作者单位： | Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China);Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China);Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China) |
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| 基金项目： | Supported by the National Natural Science Foundation of China (No. 30671237),the Innovative Group Grant of the National Natural Science Foundation of China (No. 30821003); the National Basic Research Program(973 Program) of China (No. 2007CB109302) |
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| 摘 要： | Root exudates,microorganism colonization and soil aggregates together form the rhizosheath,a special cylinder of micro-ecosystem adhering to the root surface.To study how the rhizosheath affects soil structure and nutrient distribution,we analyzed the impact of maize rhizosheath on soil particle size and nutrient availability in pot and field experiments.The results showed that there was a significant size decrease of soil particles in the rhizosheath.Meanwhile,the soil mineral nitrogen in the rhizosheath was significantly higher than that in the rhizosphere or bulk soil at tasseling and maturity stages of maize.The contents of Fe and Mn were also differentially altered in the rhizosheath.Rhizosheath development,indicated by a dry weight ratio of rhizosheath soil to the root,was relatively independent of root development during the whole experimental period.The formation of maize rhizosheath contributed to the modulation of soil particle size and nutrient availability.The subtle local changes of soil physical and chemical properties may have profound influence on soil formation,rhizospheric ecosystem initiation,and mineral nutrient mobilization over the long history of plant evolution and domestication.
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| 关 键 词： | micronutrient mineral nitrogen mucilage rhizosphere root exudates |
Modulation of soil particle size and nutrient availability in the maize rhizosheath |
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| MA Wei,LI Xue-Xian and LI Chun-Jian. Modulation of soil particle size and nutrient availability in the maize rhizosheath[J]. Pedosphere, 2011, 21(4): 483-490 |
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| Authors: | MA Wei LI Xue-Xian LI Chun-Jian |
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| Affiliation: | Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China);Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China);Department of Plant Nutrition, China Agricultural University, Beijing 100193 (China) |
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| Abstract: | Root exudates, microorganism colonization and soil aggregates together form the rhizosheath, a special cylinder of micro-ecosystem adhering to the root surface. To study how the rhizosheath affects soil structure and nutrient distribution, we analyzed the impact of maize rhizosheath on soil particle size and nutrient availability in an experiment with pot and field treatments. The results showed that there was a significant size decrease of soil particles in the rhizosheath. Meanwhile, the soil mineral nitrogen in the rhizosheath was significantly higher than that in the rhizosphere or bulk soil at tasseling and maturity stages of maize. The contents of Fe and Mn were also differentially altered in the rhizosheath. Rhizosheath development, indicated by a dry weight ratio of rhizosheath soil to the root, was relatively independent of root development during the whole experimental period. The formation of maize rhizosheath contributed to the modulation of soil particle size and nutrient availability. The subtle local changes of soil physical and chemical properties may have profound influence on soil formation, rhizospheric ecosystem initiation, and mineral nutrient mobilization over the long history of plant evolution and domestication. |
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| Keywords: | micronutrient mineral nitrogen mucilage rhizosphere root exudates |
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