Research on the threshold effects of the intensity of pesticide use, crop biodiversity and the occurrence acreage of crop diseasesand insect pests
Journal Title: 广东农业科学 - Year 2018, Vol 45, Issue 9
Abstract
Based on provincial panel data of 30 provinces(cities and autonomous regions)from 2003 to 2013, this paper built two panel threshold models which took the intensity of pesticide use and crop biodiversity as threshold variables and analyzedthe threshold effect of the intensity of pesticide use and crop biodiversity on the occurrence acreage of crop diseases and insect pests. The results showed that the intensity of pesticide use could not only increase the occurrence acreage of crop diseases and insect pests, but also had a significant threshold effect on crop biodiversity. When the crop biodiversity was lower than the threshold value, an extra unit of the intensity of pesticide use would increase 0.8048 units of the occurrence acreage of crop diseases and insect pests; when the crop biodiversity was higher than the threshold value, the impact of the intensity of pesticide use on the occurrence acreage of crop diseases and insect pests would decrease to 0.66 times of its lower threshold value. Crop biodiversity had a significant threshold effect on the occurrence acreage of crop diseases and insect pests, and it was double thresholds: when the intensity of pesticide use was lower than the first threshold value, crop biodiversity had a significantly negative effect on the occurrence acreage of crop diseases and insect pests; when the intensity of pesticide use was between the first and the second threshold values, the effect of crop biodiversity on the occurrence acreage of crop diseases and insect pests was negative but not significant; when the intensity of pesticide use was higher than the second threshold value, the effect of crop biodiversity on the occurrence acreage of crop diseases and insect pests would be more significant than it was lower than the first threshold value. As a result, this paper put forward the following suggestions: controlling the intensity of pesticide use and strengthening the protection of crop biodiversity.
Authors and Affiliations
Wan NIE
Investigation and evaluation on soil fertility of cassava plantations in Guangdong
"Samples of the top soil (0 to 20 cm beneath the ground) from cassava plantations in five demonstration counties (Xingning, Wengyuan, Suixi, Kaiping, and Yunan) of CARS-12 Guangzhou Comprehensive Test Stationb , were sel...
Study on composting effect of excrement and green plant wastes in leisure agricultural park
Excrement and green plant waste were chosen as material in composting experiments to study the influence of bacteria agent and different proportion of excrement and green plant wastes on composting effect. The results sh...
Effects of UVA radiation on cuticle microstructure of Tribolium castaneum
"Ultraviolet A( UVA) is a very important abiotic environmental factor to organisms. Cuticles are always the first line of defense to UV radiation. Changes of cuticle morphology and physiology contributing to UV resista...
Fine mapping of genes based on molecular markers and high-throughput sequencing
The rice spotted leaf mutant Spl34 is a naturally obtained mutant. The mutant Spl34 had been studied in the morphological, physiological and biochemical aspects of the mutant Spl34. The F2 gene localization population wa...
Growth traits from different provenances of Melia azedarach at seedling stage
"In this study,6 growth traits of Melia azedarach seedlings from 10 provenances in China were measured,and the genetic variations of growth traits from different provenances were analyzed. The results showed that varia...