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Accueil du site → Doctorat → Chine → 2013 → Effects of Warming and Precipitation on Spring Wheat in the Semi-arid Region, and Response of Crop Layout on Regional Climate Change

Gansu Agricultural University (2013)

Effects of Warming and Precipitation on Spring Wheat in the Semi-arid Region, and Response of Crop Layout on Regional Climate Change

王鹤龄; Wang He Ling

Titre : Effects of Warming and Precipitation on Spring Wheat in the Semi-arid Region, and Response of Crop Layout on Regional Climate Change

Auteur : 王鹤龄; Wang He Ling

Grade : Doctoral Dissertation 2013

Université : Gansu Agricultural University

Résumé partiel
The regulations of spring wheat (TriticumaestivumL)response to precipitation changing andtemperature increasing were studied in this thesis based on field experiments and a long sequenceagro-meteorological datain semi-arid rainfed farming regions. Meanwhile, the impact of climatechanging on growing, developing and layout of main crops in Gansu Province were analyzed.The main results were as followed:Emergence rate of spring wheat increased significantly with temperature increasing in thesemi-arid regions. The stages of vegetative growing and reproductive growing of spring wheatdecreased significantly with the precipitationdecreasing. The stages of springwheat were putforward with the global climate warming, and stages of cotton, except the stage of cessationgrowing. The periods of wintering stage-green stage, milky ripe stage-maturity stage and wholegrowing stage of spring wheat were shorten. The periods of sowing stage-five-leaf stage, five-leafstage-budding stage, spinning stage-cessation growing stage and whole growing stage of cottonwere prolonged.Effects of temperature increasing and precipitation changing on height of spring wheat werenot significant at the jointing stage, but were significant at the filling stage. The cooperationeffects of precipitation decreasing and temperature increasingon aboveground dry matter ofspring wheat were negative, and precipitation increasing could alleviate this negative effect. Theunderground dry matter of spring wheat increased and then decreased with temperatureincreasing.The Pn of spring wheat leaves increased when temperature increased about1degree, but not2-3degree. Meanwhile, hot and drought conditions were not good for photosynthesis duringthejointing stage.The interactions of temperature increasing and precipitation decreasing restrainedthe photosynthesis of spring wheat during late stages. And also temperature increasing restrainedthe photosynthesis, but precipitation increasing increased photosynthesis. The stomataon leaveswas main factor for the decline photosynthetic of spring wheat during jointing stage, but not thestomata after the filling stage. The water use efficiency (WUE) of spring wheat decreased withthe temperature increasing during the jointing stage, and effects was obvious as the precipitationdecreasing, but not obvious when precipitation increasing or unchanging. WUE decreased withthe temperatureincreasingwhen precipitation decreased about20%. WUE increased at first and then decreased with the temperatureincreasingwhen precipitation increasing or unchanging. Andinflection point temperatures were1℃and2℃, respectively.The potential maximal photochemical efficiency (Fv/Fm), the actual photochemicalquantum efficiency (ΦPSII), photochemical quenching (qP) and electron transport rate (ETR)decreased in logarithmic function withthe temperature increasing. And effects were obvious asthe precipitation decreasing. NPQ increased at first and then decreased with thetemperatureincreasing, and the inflection point temperature was2℃. Precipitation had notsignificantly effects on fluorescence parameters. So it can be concluded that response of wheat tothe precipitationwas not sensitive as the precipitationdecreased about20%duringthe temperaturechanged about0-3°C.With the temperature increasing, the proline (Pro) contentand soluble protein contentofspring wheat leaves increased, but the soluble sugar contentdecreased. At the sametemperature,the Procontentincreased with the precipitation increasing, but the soluble sugarcontentand soluble protein content decreased. The SOD activity of spring wheat leaves decreasedwith the temperature increasing under the conditions of precipitationincreasing or unchanging.The SOD activity of spring wheat leaves increased at first and then decreased with thetemperature increasing under the conditions of precipitationincreasing, and the inflection pointtemperature was1℃, but SOD activity decreased all times. The malondialdeyde (MDA) contentand the relative permeability of the plasma membrane (RC) of spring wheat increased withthetemperature increasing.The cooperation effects of precipitation decreasing and temperature increasingabout3℃ondecrease of number of grain of spring wheat were significant. And effects of precipitationdecreasing on grain weight of spring wheat were important under condition of the temperatureincreasing. The rate of sterility spike of spring wheat increased with the temperature increasing inquadratic

Mots clés : Climate changing; temperature increasing; precipitationchanging; spring wheat; winter wheat; potato; maize;

Présentation (CNKI)

Page publiée le 2 septembre 2014, mise à jour le 30 septembre 2017