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Selforganizology, 2014, 1(3-4): 143-205
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Article

Interspecific associations of weed species around rice fields in Pearl River Delta, China: A regional survey

WenJun Zhang1,2, Rui Wang1, DanLin Zhang1, Wu Wei1, HaiDong Chen1
1School of Life Sciences, Sun Yat-sen University, Guangzhou, China
2International Academy of Ecology and Environmental Sciences, Hong Kong

Received 18 July 2014;Accepted 15 August 2014;Published online 1 December 2014
IAEES

Abstract
Determination of interspecific associations contributes to understand the assembly and succession of community, a self-organizing process. In present study, point correlation, Spearman rank correlation, and Pearson correlation were used to detect the interspecific (inter-family) associations of weed species (families) using the sampling data (55 samples, each with the size of 2m by 2m) collected around rice fields in Pearl River Delta (Zhuhai, Zhongshan, Dongguan, and Guangzhou), China. The results showed that most of the associations between weed species/families were positive associations. The competition/interference/niche separation between weed species/families was not significant. Combing the conclusion of RPH test, we concluded that the positive associations may largely result from similar requirements to environmental conditions. A lot of pairs of weed species and families with statistically significant interspecific/inter-family associations based on three correlation measures were discovered. Major species and families that determine between-sample variation was detected by using PCA. It is a data type paper. A large number of data were thus given also.

Keywords interspecific associations;weeds;point correlation;Spearman rank correlation;Pearson correlation;PCA;Pearl River Delta.


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