涝灾条件下狗尾草对三种草坪草生长的影响

The influence of green bristlegrass on three turfgrass species under unfavorable water condition.

该研究的目的是确立在涝灾环境中草坪除草的策略 .研究结果表明 :早熟禾 (Poaspp .)、黑麦草 (Loliumspp .)和高羊茅 (Fescutaspp .)生长至 9～ 11cm时遭遇涝灾 ,此时 3种草坪草生长高度无论低于或高于或相近于狗尾草 (Setariaviridis(L .)Beauv) ,7d内生长高度继续增长 ,而 7d后植株的生长量也上升 .狗尾草密度在 2 0 0株 /m2以内 ,3种草坪草生长高度增长的幅度随狗尾草密度增加而降低 ;狗尾草密度在 2 0 0株 /m2 左右 ,3种草坪草在涝灾中生长高度增加最小 ,而生长量上升的幅度不及无狗尾草的一半 .以上结果说明 ,狗尾草在可存在密度下对草坪草抵抗恶劣环境无积极意义 .

The study was conducted in weed science section of China Agri. Univ. from 1994 to 1999, in order to get management strategy of green bristlegrass in turf in an unfavorable water condition. The results show that, no matter the height of turf was higher or lower than or as high as that of green bristlegrass, the heights of the three turf (\%Poa\% spp., \%Lolium\% spp., \%Fescuta\% spp.) which were 10?cm or so and their output increased after getting to water less than 100% for 7d. Under the density of 200 plants per square meter for the green bristlegrass, the increase degree of these three turf heights decreased as the density of green bristlegrass increased. With the density of green bristlegrass around 200 plants per square meter, the increase degrees of the three turf heights were the smallest; and these turf's output increase degrees were below half of the weight increase of green bristlegrass. It is concluded that, under the permissible density, the green bristlegrass has no positive effects for the turfgrass to survive in the bad conditions.