| Biological sciences & biotechnology |
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| Blocked quadrat variance analysis for spatial relation of Ectropis oblique hypulina larva and spider natural enemies. |
| Liu Feifei1, Ke Shengbing1, Wang Jianpan1, Bi Shoudong1*, Zou Yunding1, Zhou Xiazhi1, Dang Fenghua1, Xu Jinfeng2, Yu Kun1, Zhao Xuejuan1 |
| (1. School of Science, Anhui Agricultural University, Hefei 230036, China; 2. Plant Protection Station of Qianshan City in Anhui Province, Qianshan 246300, Anhui, China) |
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Abstract The relationships between insect pests and their natural enemies include the quantitative relations of their occurrence, the temporal relationships of their occurrence as well as their spatial distribution patterns. In previous studies, the quantitative relationships between tea pests and their spider natural predators have been researched by grey correlation degree analysis. In addition, the niche overlap index and niche similarity coefficient analysis methods have been used to assess the natural predators of pests, which studied the spatial and temporal relationships of the insect pests and their natural predators. Moreover, the ranges of spatial dependence (RSDs) of natural enemies and insect pests were respectively calculated by the method of geostatistics. Then the RSDs were analyzed using grey correlation degree analysis to systematically investigate the spatial relationships between pests and enemies. Spiders are the major natural enemies of Ectropis oblique hypulina. Therefore, scientifically utilizing and conserving spider natural enemies for integrated insect pest control of tea is necessary, and can provide scientific basis for evaluating the dominant natural enemies of E. oblique hypulina. In this work, the close degree of spatial following relationship between E. oblique hypulina and its natural enemies was examined. And the sampling size of quadrat of E. oblique hypulina in tea garden in Qianshan area, Anhui Province was estimated by blocked quadrat variance analysis, grey relation analysis, aggregated-intensity index method of spatial patterns and ρ index method. The results showed that the most closely followed spider natural enemies of E. oblique hypulina were Misumenops tricuspidatus and Theridion octomaculatum, with correlation degree values of 0.856 8 and 0.788 8, respectively, whilst the less close following relationships were found to be Xysticus ephippiatus and Enoplognatha japonica, with correlation degree values of 0.631 2 and 0.569 8, respectively. Combining the blocked quadrat variance analysis with aggregated-intensity analysis, the results showed the diffusion coefficient C-value of aggregation pattern increased with the increase of basic quadrats when there were 132 basic quadrats in the poly-block. But as for uniform and random pattern, it was continuous decrease. When the numbers of basic quadrat within the poly-block were 2, 4, 6, 8, 16 and 32 as compared with 1, the gathering degree of spatial distribution of E. oblique hypulina and its spider predators was not significant difference. In the most cases, the average λ values of E. oblique hypulina were more than 2, indicating that the gathering was caused by the pest itself. When the λ values were positive, along with the increase of quadrats in the poly-block, the gathering averages were continuously increasing. The smallest scope of individual population aggregation was evaluated by using ρ index of E. oblique hypulina under different sizes of poly-blocks. As a result, the minimum area of individual population aggregation pattern of E. oblique hypulina had one basic quadrat with 1.7 m2 in this study, which provided a scientific basis for determining the size of quadrat on the pests sampling.
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Published: 20 March 2015
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Cite this article:
Liu Feifei, Ke Shengbing, Wang Jianpan, Bi Shoudong, Zou Yunding, Zhou Xiazhi, Dang Fenghua, Xu Jinfeng, Yu Kun, Zhao Xuejuan. Blocked quadrat variance analysis for spatial relation of Ectropis oblique hypulina larva and spider natural enemies.. Journal of Zhejiang University (Agriculture and Life Sciences), 2015, 41(2): 133-146.
URL:
http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2014.09.041 OR http://www.zjujournals.com/agr/Y2015/V41/I2/133
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蜘蛛类天敌与茶尺蠖幼虫空间关系的聚块样方方差分析
用聚块样方方差分析法、灰色关联度分析法、空间格局聚集强度指数法和ρ指数法对安徽省潜山县茶园茶尺蠖及其8种蜘蛛之间的关系进行分析。结果表明：与茶尺蠖空间上跟随关系密切的天敌是三突花蟹蛛（关联度值为0.856 8）和八点球腹蛛（0.788 8），跟随关系较不密切的天敌是鞍形花蟹蛛（0.631 2）和日本球腹蛛（0.569 8）；聚块样方方差分析和聚集强度分析表明，在聚块内有1~32个基本样方时，随着聚块内基本样方数的增多，聚集格局的扩散系数C值不断增大，均匀和随机格局的扩散系数C值不断减小；茶尺蠖及其蜘蛛在聚块基本样方数为2、4、8、16和32时与为1时之间的空间分布聚集程度差异均不显著；茶尺蠖的种群聚集均数λ在多数情况下大于2，聚集是由其本身原因造成的，在种群聚集均数为正值时，随着聚块内基本样方数的增加，种群聚集均数不断增大；用茶尺蠖不同大小聚块的ρ指数判断其聚集时个体群的最小范围表明，茶尺蠖个体群聚集格局的最小面积是聚块中具有1个基本样方，即该文的1.7 m2，这为对该害虫抽样时确定样方大小提供了科学依据。
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