论文部分内容阅读
据1989~1991年尤溪县东边村毛竹林定点观测结果表明,毛竹枯梢病在林间流行的时间动态应属于积年流行病害(单循环病害),逐年病菌数量递增和病害在林间扩散的速率是遵循罗辑斯蒂型规律,病株率和感病指数按2.5倍和3.4倍的速率逐年上升,一般4~5年濒临毁灭。病害流行的空间动态属于聚集分布型,发病初期有较明显的发病中心区,子囊孢子呈陡峭的扩散梯度传播,扩散的水平距离5~10m范围。病菌数量按“复利病害”逐年递增,病害在林间迅速扩散,则在初次发现零星病株就应彻底消灭。
According to the fixed observation results of Moso bamboo forest in Dongbian Cun, Youxi County, 1989 ~ 1991, the time dynamics of Moso bamboo shoot blight in the forest should belong to the epidemic disease (single cycle), and the number of bacteria increased year by year and the disease spread in the forest The rate is follow Logistic type law, strain rate and susceptibility index by 2.5 times and 3.4 times the rate of increase year by year, generally 4 to 5 years on the brink of destruction. The spatial dynamics of disease epidemics belonged to the aggregation distribution pattern. In the early stage of the disease, there was a more obvious incidence center, and the ascospores showed a steep diffusion gradient spread with the horizontal distance of 5 ~ 10m. The number of bacteria by “compound disease” increasing year by year, the rapid spread of disease in the forest, then the first discovery of sporadic strains should be completely eliminated.