高山草原狭翅雏蝗的生物学特性及种群空间分布

Biological characteristics and spatial distribution of Chorthippus dubius population on high mountain grassland .

在甘肃省夏河县甘加高山草原,对狭翅雏蝗的发生期、食量、空间格局及动态进行了系统研究.结果表明,该虫1年发生1代,以卵在土中越冬.翌年5月下旬至6月上旬开始孵化出土,6月中旬至下旬为孵化出土盛期.蝗蝻多数为4龄,少数(约23％)为5龄.整个蝗蝻期为70,45±15.76 d,成虫寿命42.36±13.46 d;取食量随龄期增大而增大,蝗蝻期平均食量为368.3 mg,成虫期平均食量为743.8 mg.狭翅雏蝗在前期低龄蝗蝻阶段为聚集分布,高龄蝗蝻及成虫阶段以均匀分布和随机分布为主.

Based on rearing observations and surveys in Ganjia High-Mountain Grassland, Xiahe County, Gansu Province, the occurrence period, ingestion capacity, spatial pattern, and dynamics of Chorthippus dubius were studied. The results showed that this grasshopper had only one generation in a year. Its eggs wintered in the soil, and in the next year, they began to hatch from the last ten days of May to the first ten days of June. The hatching peak took place from the middle ten days to the last ten days of June. The majority of the nymphs possessed 4 instars, and about 23% of them possessed 5 instars. The developmental duration of the nymphs underwent about 70 days, and the longevity of the adults lasted for 42 days. The ingestion capacity of the nymphs was 368. 3 mg, and that of the adults was 743.8 mg. The spatial pattern of 1-2 instars belonged to an aggregated distribution, and that of 3~5 instars belonged to even and random distribution.