Hunan Meteorological Research Institute

Changsha, China

Hunan Meteorological Research Institute

Changsha, China

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Huang W.,Hunan Meteorological Research Institute | Huang W.,China Agricultural University | Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Atmospheric Physics | And 6 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2014

This study was based on daily precipitation data from standard meteorological stations in the 15 provinces (municipalities, or autonomous regions) in southern China. We adopted continuous days without available precipitation (Dnp) as drought index, also improved the critical values of available precipitation and drought classification standard during the data process, then calculated drought index values for crop (spring sowing-summer harvesting crop, spring sowing-autumn harvesting crop, summer sowing-autumn harvesting crop, and overwintering crop) during the most recent 50 years (from 1959 to 2009) in southern China. We analyzed the spatial distribution characteristics and inter-annual variation of crop drought frequency and crop drought duration days. In addition, we introduced daily drought frequency to study dynamic change of crop drought during the growing period. The results showed: spring sowing-summer harvesting crop drought occurred sometimes in the west of Southwest China and part of Huaibei Area during spring; spring sowing-autumn harvesting crop drought often affected the middle and lower reaches of Yangtze River, as well as the northeast of South China and the east of Southwest China during summer and autumn; summer sowing-autumn harvesting crop drought often occurred in the middle and lower reaches of Yangtze River during autumn, as well as the east and north of South China; overwintering crop drought took place in the north of Yangtze River and South China during autumn and spring, especially drought occurred frequently in the west of Southwest China during autumn to next spring. Generally, the distribution of drought duration days without available precipitation was basically consistent with the distribution of drought frequency, which meant drought lasted relatively longer in drought-prone area. The characteristics of drought change trend in southern China showed that: spring sowing-summer harvesting crop drought showed a decreasing trend in covering area as well as a reducing trend in intensity; spring sowing-autumn harvesting crop drought showed a slightly increasing trend in covering area yet a slightly reducing trend in intensity; summer sowing-autumn harvesting crop drought showed a significantly increasing trend in covering area and a slightly increasing trend in intensity with an exception of the Southwest China showing a reducing trend in intensity; overwintering crop drought showed a relatively more significantly increasing trend in covering area and an reducing trend in intensity with an exception of South China showing a increasing trend in intensity. From the perspective of daily drought frequency, early spring in the south and west of South China as well as the north of Yangtze River, together with spring in the west of Southwest China, showed a relatively higher drought frequency, hence affected spring sowing crops; midsummer drought in July and August in the middle and lower reaches of Yangtze River, autumn drought in September and October in South China, together with midsummer and autumn drought in the east of Southwest China mainly affected autumn harvesting crops; overwintering crop showed a relatively higher drought frequency in the whole study area, and the main drought period was in autumn and wintering period, however, early spring in the north of Yangtze River, as well as the south of South China, and Southwest China showed a relatively higher drought frequency.


Li Y.,China Agricultural University | Li Y.,Guizhou Key Laboratory of Mountainous Climate and Resources | Yang X.,China Agricultural University | Ye Q.,China Agricultural University | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

Based on ground observation data from 91 meteorology stations during 1961-2007 and phenology data of single cropping rice and double cropping rice from 63 agrometeorology experimental stations during 1981-2006 well spread over the middle and lower reaches of the Yangtze river, using the U.S. Department of Agriculture Soil Conservation method and some methods recommended by Food and Agriculture Organization, the effective precipitation and rice water requirement were calculated and water use efficiency(WUE) of the supply irrigation(Is) for the double cropping rice and single cropping rice were analyzed. The results indicated that in study area, effective precipitation of the early season rice and single cropping rice were increasing, but the late season rice decreased along with global climate changes in study period. The early season rice, late season rice and single cropping rice water requirement showed a downward trend, and water requirement of single cropping rice and late season rice significant reduced. The supply irrigation water requirement of single cropping rice was less 125 mm than double cropping rice, but water use efficiency of double cropping rice was higher than that of single cropping rice at the study area. So from the perspective of WUE increasing, it is preferable to plant double cropping rice in the middle and lower reaches of the Yangtze river.


Huang W.-H.,Hunan Meteorological Research Institute | Sui Y.,China Agricultural University | Yang X.-G.,China Agricultural University | Dai S.-W.,University of Nebraska - Lincoln | Li M.-S.,Chinese Academy of Agricultural Sciences
Ying yong sheng tai xue bao = The journal of applied ecology / Zhongguo sheng tai xue xue hui, Zhongguo ke xue yuan Shenyang ying yong sheng tai yan jiu suo zhu ban | Year: 2013

Zoning seasonal drought based on the study of drought characteristics can provide theoretical basis for formulating drought mitigation plans and improving disaster reduction technologies in different arid zones under global climate change. Based on the National standard of meteorological drought indices and agricultural drought indices and the 1959-2008 meteorological data from 268 meteorological stations in southern China, this paper analyzed the climatic background and distribution characteristics of seasonal drought in southern China, and made a three-level division of seasonal drought in this region by the methods of combining comprehensive factors and main factors, stepwise screening indices, comprehensive disaster analysis, and clustering analysis. The first-level division was with the annual aridity index and seasonal aridity index as the main indices and with the precipitation during entire year and main crop growing season as the auxiliary indices, dividing the southern China into four primary zones, including semi-arid zone, sub-humid zone, humid zone, and super-humid zone. On this basis, the four primary zones were subdivided into nine second-level zones, including one semi-arid area-temperate-cold semi-arid hilly area in Sichuan-Yunnan Plateau, three sub-humid areas of warm sub-humid area in the north of the Yangtze River, warm-tropical sub-humid area in South China, and temperate-cold sub-humid plateau area in Southwest China, three humid areas of temperate-tropical humid area in the Yangtze River Basin, warm-tropical humid area in South China, and warm humid hilly area in Southwest China, and two super-humid areas of warm-tropical super-humid area in South China and temperate-cold super-humid hilly area in the south of the Yangtze River and Southwest China. According to the frequency and intensity of multiple drought indices, the second-level zones were further divided into 29 third-level zones. The distribution of each seasonal drought zone was illustrated, and the zonal drought characteristics and their impacts on the agricultural production were assessed. Accordingly, the drought prevention measures were proposed.


Huang W.,China Agricultural University | Huang W.,Hunan Meteorological Research Institute | Yang X.,China Agricultural University | Li M.,Chinese Academy of Agricultural Sciences | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

Seasonal droughts have frequently taken place in the south of China in recent years, resulting of a serious impact on agricultural production. Therefore, analyzing the evolution characteristics and occurring rules are important to provide theory evidence for instituting policies about disaster prevention and mitigation under global climate change. Using standardized precipitation index (SPI) to describe drought, with precipitation data from weather stations in 15 provinces in the south of China, monthly drought indices in the recent 58yrs (from 1951 to 2008) were calculated, annual and seasonal change in station proportion of drought frequency were analyzed, which is the ratio of stations with drought occurring to overall stations, and the same for drought intensity. The results showed that drought in the south of China had increased with different magnitudes in the study period. Drought has become more serious in spring and autumn, though it's the opposite in summer and winter. In the different zones of the study region, drought changes in the middle and lower reaches of Yangtze River, in Southwest China and in South China, were similar to the whole study region. Under the background of climate change, the drought change was bad for agricultural production. Comparing with other drought indices, SPI can catch basic features of the annual variations characteristics of seasonal drought in the south of China.


Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Physics | Huang W.-H.,China Agricultural University | Huang W.-H.,Hunan Meteorological Research Institute | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2013

Based on the 1959-2008 meteorological data from 249 meteorological stations in southern China, and by using crop water deficit index (CWDI) as the agricultural drought index, this paper calculated the drought frequency and drought stations ratio in this region, and analyzed the spatiotemporal distribution characteristics of drought for spring maize and summer maize during their growth periods. As for the spatial pattern of drought frequency, the drought for spring maize was more severe in the north of Huaihe River, northern Yunnan, and southern South China, but was lighter in the other regions. Except that the drought for summer maize at its late developmental stage was more severe in the middle-lower reaches of Yangtze River, northern South China, and eastern Southwest China, the drought for summer maize at its other developmental stages within southern China was lighter. As for the variation trend of drought intensity and drought area, the drought intensity of spring maize from its seven-leaf stage to jointing stage in the middle-lower reaches of Yangtze River increased obviously, while the drought intensity and drought area of the spring maize from its late spinning stage to milky maturity stage presented a decreasing trend. The drought of summer maize from its late jointing stage to tasseling stage and from late spinning stage to milky maturity stage all showed a decreasing trend. In Southwest China, the drought intensity and drought area for spring maize and summer maize had no clear trend. From the viewpoint of the inter-annual and decadal variability of drought intensity and drought area, there was a larger variation for the summer maize in the middle-lower reaches of Yangtze River, but less difference in Southwest China.


Huang W.-H.,Hunan Meteorological Research Institute | Huang W.-H.,China Agricultural University | Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Atmospheric Physics | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2013

Zoning seasonal drought based on the study of drought characteristics can provide theoretical basis for formulating drought mitigation plans and improving disaster reduction technologies in different arid zones under global climate change. Based on the National standard of meteorological drought indices and agricultural drought indices and the 1959-2008 meteorological data from 268 meteorological stations in southern China, this paper analyzed the climatic background and distribution characteristics of seasonal drought in southern China, and made a three-level division of seasonal drought in this region by the methods of combining comprehensive factors and main factors, stepwise screening indices, comprehensive disaster analysis, and clustering analysis. The first-level division was with the annual aridity index and seasonal aridity index as the main indices and with the precipitation during entire year and main crop growing season as the auxiliary indices, dividing the southern China into four primary zones, including semi-arid zone, sub-humid zone, humid zone, and super-humid zone. On this basis, the four primary zones were subdivided into nine second-level zones, including one semi-arid area-temperate-cold semi-arid hilly area in Sichuan-Yunnan Plateau, three sub-humid areas of warm sub-humid area in the north of the Yangtze River, warm-tropical sub-humid area in South China, and temperate-cold sub-humid plateau area in Southwest China, three humid areas of temperate-tropical humid area in the Yangtze River Basin, warmtropical humid area in South China, and warm humid hilly area in Southwest China, and two superhumid areas of warm-tropical super-humid area in South China and temperate-cold super-humid hilly area in the south of the Yangtze River and Southwest China. According to the frequency and intensity of multiple drought indices, the second-level zones were further divided into 29 third-level zones. The distribution of each seasonal drought zone was illustrated, and the zonal drought characteristics and their impacts on the agricultural production were assessed. Accordingly, the drought prevention measures were proposed.


Wang M.,Sichuan Agricultural University | Wang X.,Meteorological Bureau of Luzhou City | Huang W.,Hunan Meteorological Research Institute | Ma J.,Sichuan Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Southwest of China is an important agricultural area, and seasonal drought is the most common agro-meteorological disaster in this region. Therefore, the study of temporal and spatial distribution of seasonal drought in Southwest of China is important for drought resistance and disaster reduction. In this study, daily precipitation, temperature, sunshine hours, relative humidity, wind speed and vapor pressure of 97 meteorological stations in four provinces (city) in the recent 50 years (from 1959 to 2008) were collected and used to calculate the relative moisture index (M). The spatial distribution of drought frequency and intensity in Southwest of China was analyzed at annual and seasonal time scale, and the annual variation of drought intensity and distribution in the recent 50 years were addressed. The results showed that, drought frequency at annual time scale was higher in the west, and lower in the east, exhibiting pronounced zonation patterns in Southwest of China. The areas with high incidence of drought mainly located at the western Sichuan plateau, the mountainous area in Southwestern Sichuan, and the regions of mountains, plateau and river valley in the northwest and north center of Yunnan. In these areas, drought occurred over twice in every three years, and drought intensities were mainly moderate or severe. The variation of drought frequency was significant between seasons. Drought happened most frequently in winter, followed by spring, autumn and summer. Winter drought was the most severe among the four seasons, followed by spring drought, autumn drought and summer drought. In general, the areas with high drought frequency normally had high drought intensity. In the aspect of annual variation, Southwest of China was getting wetter in recent years. Annual drought intensity was smaller, and drought was less severe in spring and autumn, but more severe in summer and winter over the past 50 years. In the last 10 years, annual drought intensity was obviously higher, and drought was more severe in summer, autumn and winter. This was consistent with the fact of high drought occurrence in Southwest of China over the past few years.


Huang W.-H.,Hunan Meteorological Research Institute | Huang W.-H.,China Agricultural University | Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Atmospheric Physics | And 4 more authors.
Chinese Journal of Applied Ecology | Year: 2013

To analyze the spatiotemporal characteristics and occurrence regularity of seasonal drought can provide theoretical basis for constituting the countermeasures of drought resistance and drought mitigation under the background of global climate change. Based on the 1959-2008 daily precipitation and atmospheric temperature data collected from the meteorological stations in 15 provinces (municipalities, and autonomous regions) of southern China, and using the percentages of precipitation anomalies (Pa) in the national standard "Meteorological Drought Classification", which were locally modified, the drought indices in southern China in 1959-2008 were calculated, and the spatial distribution characteristics of drought frequency in southern China in each year, each season, and each month, as well as the inter-annual changes of the drought intensity and the proportions of the stations with seasonal drought were analyzed. In the study period, the annual drought risk in southern China was generally low. There existed obvious seasonal differences in the spatial distribution characteristics of the drought. Autumn drought was most frequent and most intensive, mainly occurred in the middle and lower reaches of Yangtze River, South China and in the other major agricultural areas, winter drought was also frequent and intensive, mainly occurred in the west of Southwest China and the South China and other winter crop planting areas, while spring drought and summer drought were relatively less frequent or intensive. Spring drought mostly occurred in the southwest of Southwest China, the south of South China, and Huaibei area etc., and summer drought mostly occurred in the middle and lower reaches of Yangtze River, southeastern coastal area of Fujian, and northeast of Southwest China. The area with drought frequently occurred showed an obvious monthly fluctuation and space transformation, which was decreased with time from November to next May, increased with time from May to November, in the smallest range from April to June, and in the widest range from November to December. The annual drought area showed a slight decrease while the drought intensity should a slight increase, but the situation differed with season, i. e., spring drought area slightly decreased and the drought intensity weakened, summer drought area had an obvious decrease and the drought intensity weakened, autumn drought area increased obviously and the drought intensity increased, while winter drought area decreased and the drought intensity weakened.


Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Physics | Huang W.-H.,China Agricultural University | Huang W.-H.,Hunan Meteorological Research Institute | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2012

In recent years, seasonal drought occurs frequently in southern China, giving severe impact on the production of local wintering crops. Based on the 1959-2009 meteorological data from 268 meteorological stations in southern China, and by using crop water deficit index (CWDI) as agricultural drought index, this paper analyzed the spatiotemporal characteristics of drought for winter wheat and rapeseed. The results showed that in southern China, drought happened more frequently in Southwest China, north Huaihe basin, and parts of South China during the developmental stages of wintering crops. In the mid-lower Yangtze basin, the intensity and extent of drought increased during the mid-late developmental stages of winter wheat, and became much heavier at its later developmental stages. For rapeseed, the intensity and extent of drought increased during the developmental stage before winter and the late developmental stages. In southwest part, the intensity and extent of drought increased significantly during the developmental stage before winter for winter wheat and rapeseed. Since the early 1990s, the intensity and extent of drought in southern China increased during the mid-late developmental stages of wintering crops.


Sui Y.,China Agricultural University | Sui Y.,CAS Institute of Physics | Huang W.-H.,China Agricultural University | Huang W.-H.,Hunan Meteorological Research Institute | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2012

Based on the 1959-2008 precipitation data from 262 meteorological stations in southern China, this paper analyzed the change characteristics of seasonal precipitation trend coefficient, precipitation variability, and annual and decadal precipitation standardized anomalies in this region. In the study period, there was a great difference among the trend of quarter precipitation. In most parts of the region, the precipitation in spring and autumn presented a decreasing trend but that in summer and winter was in adverse; only in southwest part, a slightly different trend was observed. In the whole region, the probability of spring drought decreased, but that of summer drought, autumn drought, and winter drought increased. Spring drought often occurred in south and southwest parts, summer drought and autumn drought often occurred in south part and the middle, lower reaches of Yangtze River, and winter drought expanded from south part to south part and the middle, lower reaches of Yangtze River. The precipitation in spring and autumn was below the normal level after the 1980s, while that in summer and winter was below the normal level before the 1990s, above the normal level in the 1990s, and below the normal level since the 21st century. The decadal change of the seasonal precipitation standardized anomaly in each part of the region was basically consistent, i. e., decreased in autumn and increased in summer and winter.

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