Dynamic impact of vertical stratification in a tea plantation on predation pressure by natural enemies
Author of the article:DENG Zi-Liang1, 2** XIONG Yang-Fei2 LI Hui-Hui2, 3 ZHAO Zhi-Tian2 LIN Chang-Jin2 SUN Yue2, 3
Author's Workplace:1. Anxi College of Tea Science, Fujian Agriculture and Forestry University, Anxi 362406, China; 2. State Key Laboratory of Agricultural and Forestry Biosecurity, College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 3. College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Key Words:artificial prey; biological control; vertical heterogeneity; seasonal dynamics; attack rate; ecosystem service
Abstract:
[Aim] This study
aimed to evaluate the effect of vertical stratification, seasonal variations, and temporal dynamics on predation pressure exerted by
natural enemies in a tea plantation, and to elucidate the real-time dynamics and regulatory
mechanisms of biological control functions within the tea agro-ecosystem. [Methods] From
January 2021 to June 2022, artificial prey were systematically employed to monitor predation events by natural enemies across three vertical stratification (canopy, midstory, and ground) in a tea plantation. Spatial, seasonal, and temporal patterns of predation
pressure were analyzed. [Results] A total of 40 608 artificial prey were
deployed, among which 2 362 valid predation events were recorded. Arthropods,
birds, and mammals accounted for 96.02%, 2.92%, and 1.06% of all predation events, respectively. Regarding vertical stratification, both total predation
rate and arthropod predation rate were significantly higher on the
ground level than in the tea canopy (P < 0.001) and midstory (P < 0.001). Predation rate in the
tea canopy was also significantly higher than in the midstory (P < 0.001). Birds exhibited the highest predation rate in the tea canopy. Seasonal dynamics
showed that total and arthropod predation rates
were significantly higher in summer and autumn than in spring (P < 0.05) and winter (P < 0.01), with arthropod
predation rate was higher in autumn than in summer. Bird predation rate was most
active in winter than in other seasons. Temporally, total and arthropod predation
rates increased initially and then declined between
January 2021 and February 2022, peaking in
September 2021 and dropping to the lowest level in February 2022, followed by a
slight recovery in May 2022. Throughout the period from January 2021 to
January 2022, predation rates on the ground remained
consistently and significantly higher than those in the canopy (P < 0.001) and midstory (P < 0.001). [Conclusion] Predation pressure by natural enemies in
a tea plantation displays pronounced spatiotemporal heterogeneity, driven
mainly by vertical stratification, season, and time. These findings provide a theoretical
foundation for refining conservation biological control strategies and
promoting ecologically oriented management practices in tea plantations.