筑後川下流域のクリーク雑草「チクゴスズメノヒエ」の生態と防除 : 第1報発生の状況とクリーク環境

概要

論文の詳細を見る
A subspecies of Paspalum distichum L. "Chikugo-suzumenohie" which is distinguished from "Kisyu suzumenohie" by chromozome number (2n=40), iager plant size and hairy leaf sheath, has increased recently in the creeks of Chikugo area. At present its scientific name is not designated. Distribution of Chikugo-suzumenohie in creeks in Chikugo area was investigated in relation to the structure and water quality of creeks. 1. Growing area of Chikugo-suzumenohie was 370ha and its occurring percentage to all creeks was 31%. There was a big difference in the covering amount with Chikugo-suzumenohie among regions and creeks. 2. Covering amount with Chikugo-suzumenohie was different from the structure of creeks and the concentration of nutrient of water. It seemed that the higher the NH_4-N or P_2O_5 concentration were in creek water, the more Chikugo-suzumenohie covered creeks. And the more vigorous Zizania latifolia Turcz. or Phragmites conmunis Trin. grew in the edge of creeks, the less it occurred. 3. The dissolved oxygen level in creek water was remarkably low where the creeks were densely covered with Chikugo-suzumenohie.
日本雑草学会の論文
1982-12-25