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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2017年54 No.5

Application of principal component analysis to evaluation of the stability of rice paddy ecosystems
Author of the article:CHEN Hong-Fan1, 2** LAN Bo1 LIANG Yu-Yong1 YANG Ying-Qing1*** LI Xiang-Min1
Author's Workplace:1. Research Institute of Plant Protection, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China; 2. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Words:paddy field, arthropod community structural characteristic index, variance analysis, principal components analysis, stability
Abstract:

 [Objectives]  To evaluate the control of insect pests in different rice ecosystems. [Methods]  Analysis of variance (ANOVA) and principal component analysis of the structural characteristic index of arthropod communities using different sampling methods in organic and non-organic paddy fields was conducted for two consecutive years using SAS software. [Results]  The ANOVA results show that, of four arthropod community structural characteristic indices, only the number of species was significantly different over two consecutive years in organic and non-organic paddy fields. The results of principal component analysis indicate that the contribution ratio of the first principal component to the arthropod community structural characteristic index (obtained using yellow board traps and suction sampling) in organic paddy fields reached 74.12% and 77.69%, respectively in the first year, greater than the corresponding values of 67.18% and 56.24% in non-organic paddy fields. In the second year, the contribution ratio of the first principal component to the arthropod community structural characteristic index reached 77.20% and 75.93% respectively, which were also greater than the corresponding values of 55.17% and 71.15% values in non-organic paddy fields. [Conclusion]  The contribution ratio of the first principal component to the arthropod community structural characteristic index could be used as an index of the effectiveness of pest control in organic and non-organic paddy fields. Combining this with the species diversity index allows evaluation of levels of resistance in paddy field ecosystems. 

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