麦蚜和寄生蜂对农业景观格局的响应及其关键景观因子分析
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金资助项目(30860164)


Effects of landscape structure and key landscape factors on aphids-parasitoids- hyper parasitoids populations in wheat fields
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 文章评论
    摘要:

    多样性的农业景观格局通常会导致主要作物害虫及其寄生蜂的种类、数量和动态规律等发生相应的变化。利用并设计了两种尺度的麦田农业景观格局,依据麦蚜种群发生特点,分为迁入、增长与高峰3个时期,论述了不同尺度下农业景观元素对麦蚜及寄生蜂系统的影响,通过逐步回归筛选了不同时期麦蚜及寄生蜂分布的关键景观元素,最后通过CANOCO软件模拟了麦蚜及寄生蜂的分布排序格局。结果表明不同景观因子对麦蚜及寄生蜂种群影响不同,迁入期两种尺度下裸地最有利于两种有翅蚜迁飞入田,塑料大棚对有翅蚜种群入田有抑制作用。增长期草地与林地生境对麦蚜种群增长率促进最大,塑料大棚同样抑制了麦蚜种群增长;但塑料大棚、草地与林地对蚜茧蜂的种群增长有促进作用,非麦类作物生境对蚜茧蜂种群增长抑制作用最大;草地与林地有利于重寄生蜂种群的增长;高峰期裸地比例大的农业景观下麦蚜的最大种群密度较高,草地与林地对蚜茧蜂与重寄生蜂的最大种群密度在某种程度上均有促进作用。两种尺度下的研究结果一致。不同物种的对不同景观元素反应与形态学及其生活史特征有关,且景观结构中特定的植物种类、非作物植物的密度和物候期都可能影响寄生蜂集团的多样性与功能。

    Abstract:

    Studies have shown that multiple agricultural structures could affect the dynamics and distribution of aphids, parasitoids and hyperparasitoid systems. In this article, we designed two spatial scales of agricultural structure and analyzed the affects of different agricultural landscape factors for wheat aphids, parasitoids and hyper parasitoids in two spatial scales in wheat fields in Ningxia Province, P. R. China. Through stepwise regression methods, we screened key landscape factors in two spatial scales that influenced wheat aphids, parasitoids and hyperparasitoids in different population growth periods. We then stimulated distribution and sequence of wheat aphid, parasitoids and hyperparasitoids with CANOCO software. As a result, we were able to study the influence of the landscape matrix and composition of surrounding landscapes on the proliferation of aphids, parasitoids and hyperparasitoids and analyze the dynamics of wheat aphids, parasitoids, hyper parasitoids and seven landscape factors (wheat fields, non-wheat crop fields, grassland, tree lands, bare area, plastic house, and other lands) in 95 fields over a two year periods (2009-2010). The composition and texture of the surrounding landscape were derived from high altitude photographs. Seven landscape variables, aggregated at two spatial scales ranging from 31400 m2 to 125600 m2, were measured from aerial photographs. Regression models incorporating within-field and seven landscape factors accounted for 37%-58% of the variety of aphids, parasitoids and hyperparasitoids in the wheat fields. Result showed a correlation between landscape factors and dynamics and distribution of aphids, parasitoids and hyperparasitoids. In immigration periods, bare areas greatly enhanced the immigration numbers of two wheat aphids while the employment of a plastic greenhouse sharply decreased the immigration number. In growth periods, grasslands and tree lands accelerated the population growth rate of two aphids species. As plastic greenhouse suppressed the population growth rate of aphids, however, plastic greenhouses, grasslands and tree lands accelerated the population growth rate of parasitoids (aphidiidae), which was greatly restrained by non-wheat crop habitat. Grasslands and tree lands accelerated the population growth rate of hyperparasitoids. Thus, we concluded that, in stable periods, the maximum population density was highest in the agricultural landscapes with the greatest percent of bare area. Both grasslands and tree lands increased the maximum population density of parasitoids and hyperparasitoids. The results in two spatial scales were similar. Overall, parasitoids and hyperparasitoids abundance and species diversity increased with increasing bare area in wheat fields and with increasing amounts of non-cultivated lands and increasing patchiness in the surrounding landscape. We attributed the discrepancy between the response of these parasotoids and hyperparasotoids to landscape factors in relation to differences in mophological and life history characteristics. The specific composition of parasitoid and hyperparasitoid assemblaged significantly alters parasitism at different levels of agricultural landscape composition. Future studies should evaluate more plants in landscape, non-crop herbivore densities and allot more time to the impact of agricultural landscapes on diversity and function parasitoid and hyperparasitoid. Major areas of study covered the construction and design of agricultural structure in successive spatial-temporal scale, which enhanced activity and predation of natural enemies in agricultural landscape and suppressed the pest population to the greatest extent.

    参考文献
    相似文献
    引证文献
引用本文

赵紫华,王颖,贺达汉,关晓庆,辛明.麦蚜和寄生蜂对农业景观格局的响应及其关键景观因子分析.生态学报,2012,32(2):472~482

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数: