-
Abstract
The winter wheat late frost disaster (WFD) occurs mainly in the Yellow and Huaihe River area, of which
Henan Province covers the most part. Henan is the major area of wheat production in China, but it is
severely hit by the WFD. In this study, we construct a WFD index based on the minimum temperature
and the winter wheat development period (WDP). The WFD degrees and days at 30 agrometeorological
stations in Henan Province during the period of 1981-2004 are calculated. For the large-scale temporal
variation analysis of WFD, the 24-yr WDP observation series is relatively short, so it is expanded by using
the relation between the turning green date of winter wheat and the 5-day running mean temperature and
that between the stem elongation phase and the effective cumulative temperature above a critical value of
2.5 °C. The WFD data are also expanded for the last 50 years and are analyzed by using the empirical
orthogonal function (EOF) and the Morlet wavelet methods. Characteristics in the spatial distribution and
temporal variation of WFD are revealed. The results show that the frequency of WFD is generally high,
exceeding 40% in parts of Henan, and exhibits a rising trend in the period of 19701990. The variation trend
of WFD degrees is similar to that of WFD days, and the areas with higher WFD degrees coincide the areas
with more WFD days. Moreover, the WFD degree has a greater impact on the winter wheat yield than the
WFD days. The areas with high WFD degrees lie in the southeast and southwest of Henan, and the areas
with low WFD degrees lie in the south of the Huaihe River and parts of western Henan. Temporal variations
of the first and second EOF modes of the WFD degree display 16- and quasi-22-yr periodicities, respectively.
The areas of high (low) WFD frequency are distributed in the northern Henan and the southwest border of
Henan (the northeast Henan and the middle part of southwest Henan). The temporal variation of the first
(second) EOF mode of WFD days exhibits a periodicity (periodicities) of quasi-4 yr (quasi-3 and quasi-67
yr).
-
-
Citation
ZHANG Xuefen, ZHENG Youfei, WANG Chunyi, CHEN Huailiang, REN Zhenhe, ZOU Chunhui. 2011: Spatial Distribution and Temporal Variation of the Winter Wheat Late Frost Disaster in Henan, China. Journal of Meteorological Research, 25(2): 249-259. DOI: 10.1007/s13351-011-0031-x
ZHANG Xuefen, ZHENG Youfei, WANG Chunyi, CHEN Huailiang, REN Zhenhe, ZOU Chunhui. 2011: Spatial Distribution and Temporal Variation of the Winter Wheat Late Frost Disaster in Henan, China. Journal of Meteorological Research, 25(2): 249-259. DOI: 10.1007/s13351-011-0031-x
|
ZHANG Xuefen, ZHENG Youfei, WANG Chunyi, CHEN Huailiang, REN Zhenhe, ZOU Chunhui. 2011: Spatial Distribution and Temporal Variation of the Winter Wheat Late Frost Disaster in Henan, China. Journal of Meteorological Research, 25(2): 249-259. DOI: 10.1007/s13351-011-0031-x
ZHANG Xuefen, ZHENG Youfei, WANG Chunyi, CHEN Huailiang, REN Zhenhe, ZOU Chunhui. 2011: Spatial Distribution and Temporal Variation of the Winter Wheat Late Frost Disaster in Henan, China. Journal of Meteorological Research, 25(2): 249-259. DOI: 10.1007/s13351-011-0031-x
|
Export: BibTex EndNote
Article Metrics
Article views:
PDF downloads:
Cited by: