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A Research on Mechanism of Decomposition and Reduction of Organic Soil Accompanying Root-matting in Rhizosphere of Reed

芦苇根际结根有机土分解减量机理研究

基本信息

批准号：
13680663
负责人：
HARADA Masamitsu
金额：
$ 2.37万
依托单位：
Fukushima National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680663/
关键词：
Rhizosphere of reed Oxidation-reduction potential root-matting Microaerobic environment Organic carbon Standing crops Organic decomposition Oxygen supply Reed Rhizosphere Root-mat Oxidation-reduction potential micro-aerobic conditi

项目摘要

With growth in the rhizosphere of reeds, it has been observed that their rhizomes and roots are spread around in all directions and replace the soil, the root-matting. The mechanism of decomposition and reduction of the organic soil accompanying the root-matting was studied. Four experimental pots in which contained the soil dredged from an eutrophic lake were used, and 30 reeds which budded from a seed were transplanted and were grown in the every pot.The pattern of the increase in a ground part and an underground part of the reeds was able to be expressed using the T/R ratio which is a dry weight ratio of a ground part to an underground part. It was suggested that relevance had quite a few change of this T/R ratio with the pattern of a reduction of the organic carbon in soil.The rise and fall of the organic matter in the reed-bed soil could be expressed with the mass balance model consisted of the organic supply and the bacterial organic decomposition. The organic matter was supplied by exudation into the soil accompanying transportation and storage of the photosynthetic products from a ground part to an underground part, and by release accompanying decomposition of an underground part. Bacterial organic decomposition took place under the aerobic condition in soil even without planting the reeds. However, diffusion-supply from a ground part to the root area with planting the reeds raised a microbial organic decomposition.At older aged reeds, organic reduction was shown to become easy to take place at the time of budding in spring, because that the decomposition stood high rather than supply of organic matter in quality. Moreover, it was suggested the possibility of development of the technique of promoting organic matter decomposition in soil by control of mowing time, while suppressing the organic matter supply from a ground part.

随着芦苇在根际的生长，人们观察到它们的根茎和根向四面八方伸展，并取代土壤，即根垫。研究了根系垫扎过程中有机质土壤的分解还原机理。使用4个试验盆，其中含有从富营养化湖泊中疏浚的土壤，并且从种子发芽的30株芦苇被移植并生长在每个盆中。芦苇的地面部分和地下部分的增加的模式能够使用T/R比来表示，T/R比是地面部分与地下部分的干重比。芦苇床土壤有机质的消长可用有机质供给和微生物有机分解组成的质量平衡模型来描述。有机物质通过伴随光合产物从地面部分向地下部分的运输和储存而渗出到土壤中，以及通过伴随地下部分的分解而释放而供应。在土壤有氧条件下，即使不种植芦苇，细菌有机物的分解也会发生。但是，随着芦苇的种植，从地面向根区的扩散供给增加了微生物的有机分解。在春季萌芽期，由于分解量高，而不是有机质的质量供给，所以在老龄芦苇中，有机物的减少变得容易发生。此外，有人建议，通过控制割草时间，促进土壤中的有机质分解，同时抑制从地面部分的有机质供应的技术开发的可能性。