بررسی اثر تغییر اقلیم برکیفیت انگور بی دانه سفید (مطالعه موردی: ایستگاه هواشناسی کشاورزی گلمکان)

از اثرات عمده تغییر اقلیم، تاثیر آن بر کیفیت محصولات کشاورزی می‌باشد و انگور یکی از محصولات باغی استراتژیک کشاورزی می‌باشد. مقادیر دما و بارش روزانه ایستگاه گلمکان براساس مدل hadcm3 در دوره پایه (2005-1987) و آینده نزدیک (2050-2020) تحت سناریوهای  rcp8.5وrcp4.5 با استفاده از روش ﻋﺎﻣﻞ ﺗﻐﻴﻴﺮ، ریزمقیاس شدند سپس با استفاده از سه سری داده‌های پایه هواشناسی، ریزمقیاس نمایی و کیفیت مشاهداتی انگور، کیفیت انگور برای آینده با بکارگیری شبکه عصبی پرسپترون در matlab 2019a ﺷﺒﯿﻪ ﺳﺎزی شده است. مدل اقلیمی، اﻓﺰاﯾﺶ دﻣﺎ و ﮐﺎﻫﺶ ﺑﺎرﻧﺪﮔﯽ در آینده را تحت سناریوهایrcp8.5  وrcp4.5 نسبت ﺑﻪ دوره ﭘﺎﯾﻪ نشان داد. دﻣﺎی حداکثر به ترتیب 2، 3 و 2.7 درجه سانتی گراد افزایش و دﻣﺎی حداقل به ترتیب 2.9 و1.8 درجه سانتی گراد افزایش و ﺑﺎرش به ترتیب49 و30 درصد کاهش را دارد. هر یک از متغیرهای مستقل دمای کمینه، بیشینه، و بارش با هر یک از متغیرهای وابسته سن درخت، قند، وزن خوشه، اندازه خوشه، طول میوه، عرض میوه، اسیدیته، ph و tss رابطه معناداری را بر پایه آزمون پیرسون نشان می‌دهند. تحت هر دو سناریو وزن خوشه، اندازه خوشه، طول میوه، عرض میوه، قند، ph، tss بریکس، اسیدیته و وزن حبه به صورت کاهشی پیش بینی می‌شود. در rcp8.5 میزان تغییرات بیشتر از rcp4.5 می‌باشد. در خصوصیات رنگ آبمیوه، رنگ گوشت، طعم میوه، انبارداری، بازارپسندی و حمل و نقل در دو سناریو بدون تغییر است. آزمون t-test تغییر در متغیرهای ph، قند، اسیدیته، وزن خوشه، طول میوه و طول در عرض خوشه در دو سناریو معنادار بوده است. متغیرهای وزن حبه و عرض میوه در دو سناریو 4.5 و 8.5، اندازه خوشه سناریو 8.5 و طول در عرض حبه سناریوی 4.5 فاقد تغییرات معنی داری است. نتایج نشان می‌دهد، دراثر افزایش دما و کاهش بارندگی در اقلیم آتی، برخی متغیرهای کیفت انگور در آینده با روند کاهش معنی داری مواجه خواهند شد.

Investigating the Effect of Climate Change on the Quality of White Seedless Grapes (Case Study: Golmakan Agricultural Weather Station)

Iintroduction The purpose of this articleCheck it outThe effects are wider on temperature and rainfall parameters AlsoIf any of these islamic parameters qualifyGrapesWhite seed in Golmkan area of Khorasan Razavi. One of the major effects of climate change is its impact on the quality of agricultural products. Grapes are also one of the strategic agricultural horticultural products.And the semiarid climate of Iran is highly vulnerable to future climate change, so it is an appropriate and lowcost alternative to this type of study to achieve grape crop responses to climate change by developing modeling techniques.Golmakan, a city of Golbahar section of Chenaran city in Razavi Khorasan province, 45 kilometers from Mashhad, covers an area of 2000 thousand hectares and is 1176 meters in height at 36, 29 and 59.17 meters in height. According to the Cold Desert dry climate, the climate is also classified as Cold Dry by climate. Materials andmethods Currently the customer is producing equipment for the threephase circulation converter of the AirOcean Circuit.What are the rules (provided by mathematical relations).Headcm3 model, designed and studied in the country by Ngelis and the Hadley Center Institute.And 360 days suitable for RCP8.5 and RCP4.5 scenarios.Daily temperature and precipitation values based on Hadcm3 models in baseline and future under RCP4.5, RCP8.5 scenarios. in a more complete way, the DownscalingWith the use of the change factor approach for Golmakan region, were scaled And using station data, scaled Downscaling to baseline quality by Perceptron Neural Network in A2019 Content for the Future.Multilayer neural network approach was used in this study. Multilayer neural networks have three input, middle and output segments. The middle layer corresponds to constraints. The first layer is removed from the middle section, extra data or out of the dataset; in the second layer, the data is normalized using operational definition.After defining variables and intermediate layers, the quality data is input to the neural network through the input layer and after performing the middle layer corrections, using the function definition, they exit the neural network output layer.This output consists of two parts: the first part teaching (or learning) and the second part exam. In this study, 70% of the data were used in the training section and 30% in the default test section. Pearson correlation test and Spearman and Chisquare tests were used to assess the relationship between each of these variables.In both sections, there was a significant relationship between the quality variables and the quantitative variables.Therefore, descriptive tests were used to assess the relationship between each of these variables.These tests included the Pearson correlation test and Spearman and Chisquare tests.After knowing the positive relationship between grape quality variables and basic meteorological data, the simulation process continues. Results and Discussion Climate models increasing temperature and decreasing rainfIn the future under RCP4.5, RCP8.5 scenarios Shows the ratio to the baseline period.The maximum temperature increased by 3.9 and 4.7 ° C, respectively, while the minimum temperature increased by 3.8 and 4.4 ° C, respectively, and the rainfall decreased by 0.3 and 0.8%, respectively.Pearson test showed a significant relationship between the variables.That is, each of the independent variables included min, max temperature, and precipitation Each of the dependent variables represented tree age, sugar content, panicle weight, panicle size, fruit length, fruit width, acidity, pH and TSS. Both scenarios represented panicle weight, panicle size, fruit length, fruit width, sugar, HP, TSS, Brix, acidity and weight of berries. It is predicted to decrease.In RCP8.5, the change rate is greater than in RCP4.5. Features: Juice color, meat color, fruit flavor, warehousing, marketability and transportation are unchanged in two scenarios.Ttest for most variables: pH, sugar, acidity, panicle weight, fruit length and panicle length were significant in two scenarios.In the variables of berry weight and fruit width in two scenarios 4.5 and 8.5, cluster size of scenario 8.5 and length in berry scenario 4.5 were not significant. Conclusion The results show that as a result of rising temperatures and decreasing rainfall in the future climate, some components of grape quality will change in the future.Such studies provide the opportunity for agricultural managers and practitioners in the relevant agencies to take appropriate measures, such as the proper location of gardens, to determine appropriate and appropriate future climate patterns to mitigate the potential adverse effects of new methods and practices. Provide adaptation to new and changing climate conditions Key words: Climate Change, Model HadCM3, RCP5,White Grape, Network Neural