Diversity and Population Dynamics of Predatory Natural Enemies in Paddy Field Ridges

doi:10.16409/j.cnki.2095-039x.2023.11.021

Abstract

Abstract: Natural enemy communities in farmland ecosystems have important ecological pest control functions. Due to the influence of crop planting technology and cultivation management measures, the ridge of paddy field with natural grasses has become an ideal shelter for natural enemies. In this study, the Pitfall trap method was used to systematically monitor the community and dynamics of predatory natural enemies in middle rice fields for two consecutive years. The research aimed to comprehensively define the population and diversity patterns of predatory natural enemies in paddy fields. Additionally, the study analyzed the temporal changes of carabid beetles, spiders and R. limnocharis during different periods of middle rice growing season. The results showed that in 2019 and 2020, a total of 1100 carabid beetles belonging to 23 species in 13 genera, 1928 spiders belonging to 9 families, and 1485 frogs of Rana limnocharis were captured. The population dynamics of carabid beetle, spider and rice frog fluctuated during different growth and development stages of the middle rice. The number of individuals, diversity index, uniformity index, and dominance index of Pitfall trap capture in rice at different growth stages varied significantly between years. Spiders showed significant differences in captured populations at different stages of rice growth. In 2019, the number of rice frogs captured in the tillering stage of rice was significantly higher than that in the heading to mature grain stage, and the number of rice frog individuals captured in the stem elongation to booting stage in 2020 was significantly higher than that in the tillering stage. In conclusion, the paddy field ridge system has the function of supporting the diversity of predatory natural enemies and its potential ecological control effect. Therefore, it is recommended that a certain number of grassy ridges and ditches should be appropriately retained in the process of high-standard farmland remediation to achieve the conservation of natural enemies.

Key words: rice, field ridges, predatory natural enemies, diversity, population dynamics

CLC Number:

S476

ZHENG Desong, ZHU Yulin, CHONG Hainan, LAI Qian, WANG Minjie, XIAO Haijun. Diversity and Population Dynamics of Predatory Natural Enemies in Paddy Field Ridges[J]. Chinese Journal of Biological Control, 2024, 40(5): 1000-1008.

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