Liu Changzhong, Zhou Shurong, Wang Gang, Wang Wanxiong
Department of Plant Protection, Gansu Agricultural University, State Key Laboratory of Arid Agroecology, Lanzhou University, Lanzhou.
Ying Yong Sheng Tai Xue Bao. 2002 Aug;13(8):1054-6.
The population dynamics includes quantity dynamics, space dynamics and temporal dynamics. They are interdependent and mutually influential. Fuzzy cluster analysis was carried out with the data of mean densities, indices of patchiness and occupied plot rates of Chorthippus fallax(Zubovsky) on Ganjia High Mountain Grassland in Xia-he County, Gansu Province. The results showed that the population dynamics of this grasshopper could be divided into four distinct periods, i.e., the initial stage of hatching and the last stage of adult, the peak stage of nymph, the initial stage of adult, and the peak stage of first nymph and the adult. The peak period of nymph was in the middle ten days to the last ten days of July. In this period, the eggs were completely hatched, the population was mainly composed of nymphs of 2 and 3 instars, and the population size was related to the numbers and harmful levels of this grasshopper in the same year. Therefore, this period was the key time for population prediction and chemical control.
种群动态包括数量动态、空间动态和时间动态。它们相互依存、相互影响。利用甘肃省夏河县甘加高山草原亚洲小车蝗（Zubovsky）的平均密度、斑块指数和占有率数据进行模糊聚类分析。结果表明，该蝗虫的种群动态可分为四个明显时期，即孵化初期和成虫末期、若虫高峰期、成虫初期、一龄若虫和成虫高峰期。若虫高峰期在7月中旬至下旬。在此期间，卵已全部孵化，种群主要由2龄和3龄若虫组成，种群数量与同年该蝗虫的数量和危害程度有关。因此，这一时期是种群预测和化学防治的关键时期。
