农田景观格局对南疆枣园传粉昆虫群落多样性的影响

[目的]明确新疆南疆地区农田景观格局对枣园传粉昆虫群落多样性的影响.[方法]2019和2020年在新疆阿克苏地区共选取29个试验站点,通过陷阱诱集法获取中心枣园内传粉昆虫多样性数据,调查中心枣园周围半径2 000 m范围内土地使用信息,建立枣园传粉昆虫群落指数与景观变量之间的线性混合模型,使用基于赤池信息准则的多模型推...

Effects of landscape pattern on the community diversity of insect pollinators in jujube orchards in southern Xinjiang,northwestern China

【Aim】To elucidate the effects of landscape pattern on the community diversity of insect pollinators in jujube orchard in southern Xinjiang, northwestern China.【Methods】A total of 29 sites were selected in Aksu, Xinjiang in 2019 and 2020, the diversity data of insect pollinators in focal jujube orchards were obtained by pan traps, and land use information within a radius of 2 000 m around focal jujube orchards was investigated. We built the linear mixed models with landscape variables and insect pollinator community index to elucidate the effect of landscape variables on insect pollinator community index in jujube orchard using multi-model inference technology based on Akaikes’ information criterion. 【Results】The proportion of other orchards (apple, walnut, pear, etc.) and semi-nature habitats (hedgerow, fallow, etc.) surrounding jujube orchards in southern Xinjiang in 2019 and 2020 were significantly negatively correlated with the abundance of insect pollinators in jujube orchards, across four scales (500, 1 000, 1 500 and 2 000 m). At the scales of 500 and 1 000 m, there was a positive correlation between the proportion of secondary crops (wheat etc.) and the species richness of insect pollinators in jujube orchards. The species richness of insect pollinators increased with edge density within the 1 000 m buffer. Landscape variables had no significant effect on the community diversity of insect pollinators in jujube orchards. 【Conclusion】 In southern Xinjiang, the abundance of insect pollinators in the jujube orchard is mainly affected by the dilution effect of the proportion of other fruit trees and semi-nature habitats, while the proportion of secondary crops can promote the increase of pollinator species richness. It is confirmed that the farmland landscape pattern can significantly affect the population of insect pollinators in Desert Oasis Agro-ecosystem in Xinjiang, which provides a scientific basis for the conservation of insect pollinators and the improvement of their pollination service function in southern Xinjiang.