ダイズ栽培条件下のメヒシバ個体群の乾物分配率および比葉面積の推移と発育ステージとの関係 : ダイズ単植群落と比較して

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To construct a growth and cornpetition model of D. adscendens and soybean, we analysed the temporal changes in the dry matter partitioning ratio and specific leaf area (SLA) of both species as a function of the developmental stage (DVS) of each species. The data of this study were obtained from field experiments in which the D. adscendens community was cultivated in mixed stand with soybean (cv.Enrei) at various sowing dates or planting densities of soybean for four consecutive years as compared with the "Enrei" soybean community in pure stand (Table 1). Developmental stage (DVS) of both species was deduced from the DVS model (Formulas (1) and (2)). In D. adscendens, DVS was 0 at the onset of emergence, 1 at heading and 2 at ripening. In soybean, DVS was 0 at the onset of sowing, 1 at flowering and 2 at ripening. DVS of both species which was predicted using previous models and data (Fig. 1, 2 and Formulas (1)〜(7)) showed a good fit to the values observed in field experiments (Table 2). In both species, the dry matter partitioning ratios for each plant organ changed with the developmental stage (DVS) and they were not appreciably affected by other factors, such as, year of experiment, sowing date and planting density (Fig. 4). Therefore, it appeared that the temporal in the dry matter partitioning ratio of both species could be represented using the Table function in which DVS is an independent variable and the dry matter partitioning ratios are dependent variables (Formulas (8), (9) and Table 3). In the pure stand soybean, the SLA changed with the DVS and was not appreciably affected by other factors. However in D. adscendens under soybean culture conditions, the temporal changes in SLA were affected by the DVS and also by the shading of soybean leaves. Then, it was considered that to represent the degree of shading by the soybean leaves by Q = (plant height of soybean/plant height of D. adscendens) × (LAI of soybean) and to adjust the data using Q of each DVS, the temporal changes in SLA of D. adscendens in mixed stand with soybean could be represented by the Table function in which DVS is the independent variable and SLA the dependent variable (Tables 4, 5 and Fig. 5).
日本雑草学会の論文
1990-07-27

ダイズ栽培条件下のメヒシバ個体群の乾物分配率および比葉面積の推移と発育ステージとの関係 : ダイズ単植群落と比較して

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