Biodiv Sci ›› 2016, Vol. 24 ›› Issue (3): 332-340.DOI: 10.17520/biods.2015288

• Orginal Article • Previous Articles     Next Articles

Insect community diversity in transgenic Bt cotton in saline and dry soils

Junyu Luo, Shuai Zhang, Xiangzhen Zhu, Chunyi Wang, Limin Lü, Chunhua Li, Jinjie Cui*()   

  1. Institute of Cotton Research of Chinese Academy of Agricultural Sciences /State Key Laboratory of Cotton Biology, Anyang, Henan 455000
  • Received:2015-10-22 Accepted:2016-01-10 Online:2016-03-20 Published:2016-04-05
  • Contact: Cui Jinjie

Abstract:

Cotton is one kind of economic crop that can tolerate high drought and salinity, and it has been planted increasingly in coastal saline alkaline soils and dry soils since China’s Yellow River and the Yangtze River cotton area dropped due to soil salinization and drought. In this paper, using no-transgenic cotton (CCRI 49 cotton) as control, insect community diversity in transgenic Bt cotton (CCRI 79 cotton) fields planted in coastal alkaline soils of Dongying City, Shandong Province and mildly saline and semi dry soils of Zaoqiang County, Hebei Province were investigated in 2013 and 2014. Results showed that, in the two case of spray and no-spray, the total number of individuals of insect communities and pest sub-communities in transgenic Bt cotton fields were lower than those in non-transgenic cotton, and these insect communities and pest sub-communities differed significantly. The insect diversity index and evenness index (of the insect community and pest sub-community) were higher in transgenic Bt cotton fields than those in non-transgenic cotton, but the dominant concentration index was lower than that of non-transgenic cotton. Under spraying, the total number of individuals within the insect community, pest sub-community and enemy sub-community were lower than those not sprayed fields for both transgenic Bt cotton and non-transgenic cotton. The diversity index and evenness index were lower in sprayed fields than those in no-spraying fields, but the dominant index was higher in the no-spraying cotton fields; however there were no significant difference between the sprayed and no-spraying cotton fields for both transgenic and no-transgenic cottons. Nevertherless there was lower biodiversity and simpler ecosystem than non-saline-dry soils.

Key words: saline alkaline soil, dry soil, transgenic Bt cotton, insect community