化除宿营法建立人工草地研究

Study on establishing pasture with phytocide and sheep night penning

化除宿营法建植人工草地产草量高,建植第2年最高干物质产量达到23 270 kg/hm2。化除宿营法与化除免耕法建立人工草地在建植当年没有显著差异,但第2年化除宿营法比化除免耕法增产7 353 kg/hm2(P<0.01)。在草地建植当年和第2年,施肥对地上生物量没有明显影响。化除宿营法建立人工草地宿营强度达到4羊夜即可,第2年平均干物质产量达15 483 kg/hm2。在无人为干预的情况下,蒿类等不可食杂草迅速侵入,土壤肥力越高,扩散速度越快;不可食杂草比例超过50%后,草地基本没有利用价值,地上生物量也不再急剧下降。

Yields on establishing pasture were best with phytocide and sheep night penning. Aboveground blomass （dry） was 23 270 kg/hm^2 on the best experimental treatment in the second year. Herbage yield on phytotide and sheep night penning pasture was increased by 7 353 kg/hm^2 （P〈0.01） compared with phytocide tillage only pasture in the second year, but the difference was not significant in the first year. Effect of fertilization on ahoveground biomass was not significant in either the first or second year. Four sheep nights penning was better and pasture dry mass yield attained 15 483 kg/hm^2 in the second year. Inedible weeds （e. g. Arternisia） invade swiftly if weeds are not controlled and where the soil was more fertile, the rate of spread of Artemisia was quicker. Aboveground biomass fell swiftly when animals did not forage on pasture and when the inedible weed rate was above 50%.