Assess on Agriculture of Extreme High Temperature and Drought in 2003, Jiangxi Province,China. WEI Li, DU Xiao-Ling, LIU Wen-ying
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1 Assess on Agriculture of Extreme High Temperature and Drought in 2003, Jiangxi Province,China WEI Li, DU Xiao-Ling, LIU Wen-ying Jiangxi Meteorological Bureau, Nanchang ,China Jiangxi Meteorological Observatory, Nanchang ,China Feb.2009
2 Outline Abstract Soil moisture character High temperature intensity and soil moisture Soil water household in cropland Assessment on agriculture Some measures fighting drought Discussion
3 Abstract Based on field observation data during the period of the extreme high temperature and drought in 2003, high temperature intensity, characteristics of the field evapotranspiration and soil moisture are analyzed by optimizing Penman f ormula. Assess on Agriculture of the extreme high temperature and drought is carried.
4 Brief Introduction to Jiangxi Province Jiangxi province is situated in south of China with sub-tropical monsoon climate, distinctive seasons and rich rainfall. Forest coverage of Jiangxi Province is about 60.05%.
5 But for the features with large areas of mountains, rivers, lakes and complex climate conditions, Jiangxi is also a province with frequent and severe natural d isasters,which mainly include rainstorm, fl ood, drought, hail, lightning, heat, frozen, landslide, mud-and-rock flow, plant diseases and insect pests, forest fire,etc.
6 Distribution of annual mean precipitation in Jiangxi Province
7 Distribution of annual mean temperature in Jiangxi Province
8 Distribution annual mean solar radiation in Jiangxi Province
9 Remote Sensing Map of Jiangxi Province Paddy land Vegetation Water Dry land
10 Trend of flood and drought area from 1950 to 2007, Jiangxi From 1990 to 1999,flood area is lager than that of drought. But since 2000,it is opposite. Drought area Flood area
11 Frequency of drought in summer or autumn in Jiangxi Province is 93.2 %
12 In summer 2003, an unprecedented heat wave attracted south of China that l ed to severity drought. It sustains two mo nth hot and drought weather conditions. Comparing to the same period of the history, the influenced areas,the maximum temperature and the continuous days of the disaster set up new records.
13 Located at the heat area, Jiangxi also suffered from e xtreme heat wave and drought which persists until spring in 2004.
14 Several historical records were broke through The day maximum temperature of two-part a third of counties in Jiangxi province exceeded historical record. Day maximum temperature of three-quarter of counties was 40. A number of days with maximum temperature 35 persists 71 days. There are no soaking rain in two months in more than half of the provincial land.
15 Average temperature from July to September in was 28.8,which was 1.8 higher than historical mean value and broke through passed maximum record value (28.3, 1963) since Mean precipitation in three months was only 287m m that was the minimum value in history (301mm, 1 978), but the evaporation at the same period reached 1009mm that is thirdly lied in history record. Depth of dry soil layer reached 8 to 10cm.
16 1.Soil moisture characteritics Soil humidity is continuous lower during drought and high temperature in 2003 because of sparse precipitation and strong evaporation. Soil moisture observation data in depth of 0 to 50cm in Hukou and Nankang counties were analyzed, which were observed two times in each ten days.
17 1.1 Soil weight water amount in each depth. Soil weight water changes in each depth in Nankang and Hukou County. Results shown that soil weight water amount in five depths are continuous lower than 20% from last ten days in June. The minimum value in 0 to 30cm depth in Nankang county appeared in last ten days in July which is respective 10.1%, 11.3%,12.3%(chart 1a),but the minimum value of soil weight water amount in depth 30 to 50cm happened in first ten days in August that is separately 13.1%, 13.8%(chart 1a).
18 Soil weight water changes in each depth in Nankang and Hukou County. In chart 1b,Hukou observation station, the minimum soil weight water amount in each depth layers occurred two times that was 7%,8.1% 11.3%, 12.9%,14.2% in first ten days in August and others 7% 8% 9.9% 11.6% 13.7% in first ten days in November. This results revealed that serious drought in the provincial large area presented in July to August.
19 From June to September in 2003, mean soil weight moisture amount in depth 0 to 50cm was only 16.1% in Hukou and 18.3% in Nankang, which showed that soil drought in North of Jiangxi was relatively severity compare to the South.
20 1.2 Soil relative humidity Relative humidity in depth 0 to 20cm in Nankang station was lower than 60,which appeared from middle ten days in July to first ten days in August,the minimum relative humidity was 48% to 50%.
21 Soil relative humidity from June to September Results showed that there was a time lag of about ten days in the lowerest value in North of Jiangxi to the South.
22 2 High temperature intensity and soil moisture 2.1 Defining high temperature intensity index When day maximum temperature reach 35 or more, the high temperature intensity index (HTI) express as follows when 35.0 Tmax 36.0 K= Tmax 37.0 K= Tmax 38.0 K= Tmax 39.0 K= Tmax 40.0 K=0.5 Tmax 40.0 K=0.6 HTI= ( Tmax K)/N Tmax: day maximum temperature value in a station : total value of Tmax K in all stations in the prefecture.
23 Chart2.Distribution of HTI of the province and eleven pr efectures from June to September in 2003
24 2.2 Characteristics of HTI and soil moisture content Curve in chart 2 and chart 1 showed that the minimum soil moisture content have a time lag about 10 days to peak value of HTI.
25 3 Soil water household in cropland 3.1 Crop water requirement Refined Penman equation is used to calculate evapotranspiration. Some factors such as solar radiation, efficiency radiation, dry capacity, are confirmed by experience method. Day evapotranspiration calculation method adapted to regional climate was get, which is as follow:
26 ET *[0.8 * ( B0 * ( * U B1* S ) 1.9 * T ) * ( e a e d ) 4 K * ( * e d ) * ( * n N )] ET is the maximum potential evapotranspiration is constant of psychomotor is curve slope of saturation air pressure S is sun irradiation hour, Tk is absolute temperature, ed is actual air pressure U is mean wind speed, n/nis ratio percent of actual irradiation to potential B0\B1 are coefficient between total solar radiation and irritation hour Table one is values of / + / +
27
28 3.2 Spatial distribution and anomaly of crop water requirement
29 3.3 Temporal change of crop water requirement.
30 Chart 5.It is showed that diminishing trend is dominating. Evapotranspiration increased obvious that reached to 727.5mm in 2003, which is the third high value since 1970 s.
31 3.4 Difference of precipitation and evaporation on cropland. The minimum difference value was mm in Jian, and the maximum was mm in Dingnan of Ganzhou. Water deficit reached 200mm or more. Others region is opposite.
32 4 Assessment on agriculture of extreme high temperature and drought in 2003
33 4.1 Assess on grain crop Yield per unit area of single late rice was decreased kg/hm 2,which decreased 599 kg/hm 2 than that in Yield of double late rice was kg/hm 2 that decreased 275 kg/hm 2 than in Total yield of fall season was 9,140,000kg which decreased 960,000kg than that of Total grain yield in 2003 was 1 4,503,000kg which decreased 992,000kg than that in 2002.
34 Paddy land split in Lichuan county
35 Late rice water shortage in Xiajiang county
36 Late rice can cot be plant on schedule, Linchuan county This is a key period to harvest early rice and plant late rice during the end in June to July and abundant water is needed in agriculture.
37 Water levels in rivers and lakes decrease rapidly by the extreme high te mperature and drought. Creeks break off, ponds and reservoirs dry up Water used on agriculture is severe deficiency Drought area increase rapidly at rate of 5 to 6ha and extend to the entire province.
38 Impregnation rate of middle and late rice is only 40% to 60%,which decrease distinctly. Impregnation rate of Jinyou725 only arrived 2 0%. Double rice growth encounters difficulty. It had to form organic matter and weight of grain diminished. Severe drought affects photosynthesis, assimilation of mineral, synthesizing and transportation of matter, which caused increasing of empty rates of grain and decreasing of seeds weight
39 Total drought area 3,000,000ha Light: ha moderate 713,000ha severity 23,200ha Distribution of high temperature and drought on 26,July,2003
40 4.2 Assess on economic crop and fruit. Fruit leaf yellow and rolling Abnormal falling of flower and young fruit. It impact citrus quality, shape and yield, yield decrease 30%. Young citrus trees were damaged, which led to decrease yield in next year.
41 Citrus leaf yellow and rolling in Huichang county,ganzhou,jiangxi Province
42 Assess on cotton. High temperature and severe drought made cottonseed diminishing and seeds weight decreasing, which cause that yield decrease 50% to normal year.
43 Assess on vegetable. Growth and developing of vegetable were embarrassed, which caused flower failing and yield decreasing obviously. High temperature and strong sunlight made leaf dehydrating. Some vegetable appeared dry and death when irrigation condition is not sufficient. Yield and quality were influenced.
44 Bean dry rot
45 White gourd dry rot
46 4.3 Assess on forestry High temperature and severe drought cause high frequency of forest pests and diseases,which led bamboo locust to occur a nd spread.
47 Number of days with high risk of forest fire grade from July in 2003 to February in 2004.
48 Frequency of forest fire happened. For example, Monitoring from remote sensing, there were fifteen times forest fire occurred on in July,2003,Jiangxi.
49 Forest fire,jiujiang,july,2003
50 5. Some measures to fight drought Meteorological department in Jiangxi province provide large amount service information to government and producers such as high temperature and drought monitoring, warning, forecasting and evaluating. Large scale of artificial weather modification were carried to fight drought, decreased fire risk grade, and exterminated forest fire.
51 Artificial Weather Modification
52 6. Discussion The assessment techniques on this extreme disaster are not sufficient to satisfy service. Methods to monitor and predict abnormal high temperature and drought are not objective and quantitative. Practical techniques to abate the extremely disasters are not sufficient.
53 Reference 1.Yixianwang, Influence of Height on in Penman Formula. Meteorological Journal, (4) OuyangHai, Hongliang-Tong, Xuhui-Li, Study on Evaportranspiration in China. Corpus on Dro ught, Publishing Company of Meteorology,Beijing,p42 52, OuyangHai, etc., Agroclimatology. Publishing Company of Meteorology,Beijing,p3 p , Xiaorui-Wangetc., Statistics Methods to Calculate Evaportranspiration and Application on Diagn osing Drought and Flood. Atmosphere Research and Application,p Hong-Tian etc., Study on Drought Dynamic Assessment Index in Sichuan. Meteorology, 24 (4) 11 15, Guodong-Gao, Yurong-Lu, Agroclimatology, Publishing Company of Meteorology, Beijing, p11, 1-50, Xianqun-Xie,Dakang-Zuo,Dengyen-Tang.Farmland Evaportranspiration---Observing and calcul ate. Publishing Company of Meteorology, Beijing, p , Zixi-Zhu,Study on Agriculture Meteorology and Field Evaportranspiration.Meteorology, 22 4, p3 9, 1996.
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