Based on the ecological niche theory, the population compositions and dynamics, time niche of planthoppers and main predatory arthropods were investigated in three experimental treatment plots: chemical fertilizer utilization plot, riceduck integrated cultivation plot and no chemical pesticides/fertilizer application plot, and grey relational grade analysis was conducted in the meanwhile. The results indicated that differences in individual numbers, temporal variation characteristics, temporal niche breadth and overlap index for rice planthoppers and the main predatory arthropods varied to various degrees among the three treatment plots. The number of rice planthoppers in its peak stage as well as the total individual number of the main predatory arthropods decreased. Compared with the chemical fertilizer utilization plot and the control plot, the ratio of natural enemy to rice planthoppers in the riceduck integrated cultivation plot decreased by 1.72% and 26.14%， respectively. Ecological niche breadths for predatory arthropods except Coccinellidae in the riceduck integrated cultivation plot were 2.14%-35.77% lower than those in the chemical fertilizer utilization plot, niche overlap indexes for most of the predatory arthropods, for instance, Tetragnathidae and Staphylinid, Araneidae and Coccinellidae increased concurrently. However, the number of the rice planthopper in the riceduck integrated cultivation plot were 23.70% lower than that in the chemical fertilizer utilization plot, owing to the greater effects of synchronization following performance and the enhanced pest controlling potentialities of Coccinellidae and Theridiidae, which were somewhat mitigated the influences caused by the reduction in the number of predatory arthropods and the weakened rice planthopper control capability. Grey correlation degrees between the main predatory arthropods and the rice planthopper in different rice cropping patterns or groups of predatory arthropods were differentiated. Coccinellidae, Lycosidae and Theridiidae had greater influences on rice planthopper in the riceduck integrated cultivation plot.
QIN Zhong , ZHANG Jiaen* , ZHANG Jin , LUO Shiming
. Relationship Among Rice Planthoppers and Main Predatory Arthropods in RiceDuck Integrated Cultivation System[J]. Chinese Journal OF Rice Science, 2012
, 26(4)
: 457
-466
.
DOI: 10.3969/j.issn.10017216.2012.04.011
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