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首页> 外文期刊>日本作物學會紀事 >Studies on Weed Vegetation in Non-cultivated Paddy Fields : I. The vegetation of non-cultivated paddy fields in the north-western parts of Fukuoka prefecture
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Studies on Weed Vegetation in Non-cultivated Paddy Fields : I. The vegetation of non-cultivated paddy fields in the north-western parts of Fukuoka prefecture

机译：非栽培稻田植物植被研究：I。福冈县西北部北部稻田植被

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To make clear the weed vegetation of paddy fields left off cultivation on account of government paddy acreage-control policy, the investigation were carried out in autumn of 1975. The 25 surveyed plots were located at the north-western parts of Fukuoka prefecture. Coverage and height of plants in their paddy fields were measured and Summed Dominance Ratio (SDR2), which was proposed by NUMATA, was calculated from those two factors. All the species appeared were classified into the following four plant groups from their habitat type: that is, A; perennials in lowlands, B; annuals in lowlands, C; perennials in uplands and D; annuals in uplands. And then, the relations between the SDR2 of these plant groups and the difference of soil moisture, and years of fallow were compared with each vegetation. Results are as follow. 1. At the beginning one or two years after left off cultivation, species number and SDR2 of annuals were dominative. With increase of years of fallow, species no. and SDR2 of perennials became dominative. 2. In the former case, the dominant species were annuals such as Aster subulatus, Aeschynomene indica, Panicum bisulcatum, Echinochloa spp., Leptochloa chinensis, Digitaria adscendens and so on. In the latter case, they were perennials such as Aliscanthus sinensis and Solidago altissima under upland condition, or Isachne globosa, Phragmites communis, Leersia japonica and Paspalum distichum under lowland condition. 3. The vegetation consisting of four groups were largely affected by the difference of soil moisture and years of fallow. The vegetation of paddy fields left off cultivation for many years were mostly composed by the specics of C group under upland condition and by the species of A group under lowland one. On the other hand, that of paddy fields left off cultivation for few years were composed by the species of D group under upland condition and by the species of B group under lowland one, although the relationships were not so clear as in the former. 4. The increase of number of species and SDR2 of perennials were controlled by means of managing methods such as plowing, cutting of weeds and herbicide application. The repressive effects of management against weeds varied depending on the kind of managements and the characteristics of weed species.
机译：为了清除稻田的杂草植被，留下政府稻谷种植面积控制政策培养，调查是在1975年秋天进行的调查。25个受访地块位于福冈县西北部。测量其稻田中植物的覆盖率和植物高度，并通过NUMA提出的总结占优势比（SDR2）从这两个因素计算。似乎所有物种都被分类为以下四个植物组的栖息地类型：即a;低地的多年生植物，B;低地，C;高地和D的多年生植物;高地的年度。然后，将这些植物组的SDR2与土壤水分差异以及多年的休耕之间的关系。结果如下。 1.在剩余培养后的一年或两年后，物种数量和每年的SDR2都是统治性的。随着年多年的休耕，物种没有。常年的SDR2成为统治。 2.在前一种情况下，显性物种是年度的年度，如紫苑亚血清菌，Aeschynomene indica，Panicum busulcatum，echinochloa spp，leptochloa chinensis，digitaria adscendens等。在后一种情况下，他们是贫旧的贫民窟，如旱地条件下的aliscanthus sinensis和solidago altissima，或在低地条件下的芦苇术术，芦荟japonica和paspalum distichum。 3.由四组组成的植被主要受土壤水分和多年休耕差异的影响。稻田的植被留下了多年的培养大多是由高地条件下的C组的样本和低地群体的物种组成。另一方面，稻田留下栽培几年的耕种是由高地条件下的D组种类和低地的B组种类组成，尽管关系并不是那么清楚。 4.通过管理方法，诸如犁，切割杂草和除草剂应用等方法来控制多年生单位数量和SDR2的增加。管理对杂草的抑制作用根据管理的那种和杂草物种的特征而变化。

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