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| Research on the threshold effects of the intensity of pesticide use, crop biodiversity and the occurrence acreageof crop diseasesand insect pests |
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| DOI：10.16768/j.issn.1004-874X.2018.09.025 |
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| 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. |
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