The effects of row distance on clone reproduction of Poa pratensis var. anceps cv.Qinghai

To determine the clone reproduction characteristics, the rhizome of 3 years Poa pratensis var. anceps cv. Qinghai was cut to 0(CK),30, 40, 50, 60 and 70cm as row distance treatments. The results indicated that P. pratensis var. anceps cv.Qinghai could produce seeds in the first years of clone production, the row distance treatment had significant effect on its growing characteristic and aboveground and underground biomass and seeds yield（P0.05）. Maturity of plants in 30-70 cm row distances was 2-6 days delayed contrasted to CK. The plant height, tiller number, leaf number and leaf areas in each row distances were lower than that in CK from regenerating to booting stage (P0.05). The rhizome length, number of rhizome tiller buds, the increase of aboveground and underground biomass of row treatments were lower than that of CK (P0.05) from booting stage to maturity, and then increased quickly and seed yield reached the highest (383.6 kg/hm2) at 50 cm row distances, the lowest value (233.0 kg/hm2) was obtained at 30 cm row distances. Thus, 50cm row distance was optimum for the clone planting of P. pratensis var. anceps cv. Qinghai.