休耕田の植生遷移に関する研究 : 第2報休耕田におけるイネ科のC_3型およびC_4型雑草の生態的分布と土壌水湿との関係

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We reported earlier that the weed vegetation of non-cultivated paddy fields, which had lain waste for years, varied with the difference of soil moisture. On the other hand, there is a well-known fact that higher plants can be divided into major two groups, C_3- and C_4-species, with distinct photosynthetic pathway. Recently, it is also reported that these two groups are dissimilar in their habitat affected by environmental factors such as temperature, precipitation and so on. In this investigation, in order to find out the difference of ecological distribution between C_3- and C_4-weeds according to soil moisture of non-cultivated paddy fields, the authors tried to compare the value of Summed Dominance Ratio (SDR_2) in two weed groups of the Gramineae. The data of SDR_2 used in this paper are the same ones which have been examined in the previous paper. Results are as follows: 1. The distribution of two weed groups within the Gramineae varied with the difference of soil moisture conditions in non-cultivatcd paddy fields, that is, the percentage of SDR_2 in C_3-weeds to total SDR_2 was higher in lowland conditions than in upland ones. However, that of C_4-weeds was in the reverse tendency. This relationship between ecological distribution and soil moisture condition was more apparent in paddy fields of long-year non-cultivation than in those of short-year non-cultivation. (Table 2, 3, 4) 2. It was observed that some species were distinctive in distribution pattern to soil moisture condition. Arthraxon hispidus, Hemarthria sibirica of C_4-species and Panicum bisulcatum of C_3-species showed a more adaptive characteristic to wide range of soil moisture condition than other specics. Echinochloa spp., Leptochloa chinensis and Paspalum distichum showed rather a well-growing characteristic under wet condition than other C_4-species. And in some plots where these particular C_4-species were in more invasive, SDR_2 percentage of C_4-species were higher than that of C_3-species even under lowland condition. 3. The close relation was recognized between the ecological distribution of C_3-,C_4-species to soil moisture condition and their systematical situation judged from the systematics of the Gramineae which was proposed by TATEOKA. (Table 5)
日本作物学会の論文
1977-12-30

休耕田の植生遷移に関する研究 : 第2報休耕田におけるイネ科のC_3型およびC_4型雑草の生態的分布と土壌水湿との関係

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休耕田の植生遷移に関する研究 : 第2報 休耕田におけるイネ科のC_3型およびC_4型雑草の生態的分布と土壌水湿との関係

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休耕田の植生遷移に関する研究 : 第2報休耕田におけるイネ科のC_3型およびC_4型雑草の生態的分布と土壌水湿との関係