تغییرپذیری مکانی عملکرد دانه گندم و ویژگی‌های خاک در کشت‌زارهای دیم منطقه نیمه‌خشک در جنوب استان زنجان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشیار گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان

2 دانشجوی دکتری علوم خاک، گروه علوم خاک، دانشکده کشاورزی، دانشگاه زنجان

3 استادیار مرکز پژوهش‌های کشاورزی زنجان، زنجان

4 کارشناس مرکز پژوهش‌های کشاورزی زنجان، زنجان

چکیده

به­منظور پهنه­بندی عملکرد دانه گندم، روش­های کریجینگ معمولی، کوکریجینگ و رگرسیون-کریجینگ مورد استفاده قرار گرفت. برای این منظور 298 کشتزار‌ دیم گندم با فواصل 59/0 کیلومتر از هم در شهرستان خدابنده واقع در جنوب استان زنجان در سال 1393 انتخاب شد. عملکرد دانه گندم دیم در کشت‌زارها با استفاده از پلات مربعی مورد اندازه‌گیری قرار گرفت. از هر کشتزار دو نمونه خاک سطحی جمع­آوری شد. ویژگی‌های فیزیکی و شیمیایی خاک شامل شن، سیلت و رس، رطوبت گل اشباع، ماده آلی، واکنش خاک، هدایت الکتریکی، کربنات کلسیم معادل، ازت کل، فسفر قابل دسترس و پتاسیم قابل دسترس خاک در آزمایشگاه اندازه‌گیری شدند. داده های خاک برای ارزیابی مدل­های زمین آماری و بررسی نقش ویژگی­های خاک در تعیین عملکرد دانه گندم در کشتزارها به­کار رفتند. از بین کل داده‌های مورد بررسی، 238 داده برای ارائه مدل­های زمین‌آماری و 60 داده برای ارزیابی مدل­های مذکور مورد استفاده قرار گرفتند. نتایج نشان داد که روش کوکریجینگ عملکرد گندم دیم را در نقاط جدید با دقت بیش‌تری )74/0 =R2، 95/118=RMSE) نسبت به دو روش کریجینگ معمولی )74/0 =R2، 87/127=RMSE) و رگرسیون- کریجینگ )26/0 =R2، 84/198=RMSE) برآورد می‌کند. ازت کل خاک به عنوان یک متغیر کمکی در روش کوکریجینگ برای تعیین تغییرات مکانی عملکرد دانه گندم بکار رفت. به‌طور کلی این پژوهش نشان داد با آگاهی از تغییرات مکانی ازت کل خاک می‌توان تغییرات مکانی عملکرد گندم را کمی نمود و آن را به­صورت نقشه زمین‌آماری برای اهداف مدیریتی به کار گرفت.
 

کلیدواژه‌ها


عنوان مقاله [English]

Spatial Variability of Wheat Grain Yield and Soil Properties in Semi-Arid Rainfed Croplands in South of Zanjan Province

نویسندگان [English]

  • AR Vaezi 1
  • F Babaei 2
  • M Taheri 3
  • M Abbasi 4
1 Assoc. Prof., Dept. of Soil Science, Faculty of Agriculture, University of Zanjan, Iran
2 Ph.D. Student, Dept. of Soil Science, Faculty of Agriculture, University of Zanjan, Iran
3 Assis. Prof., Zanjan Agricultural Research Center, Zanjan, Iran
4 Senior Expert of Zanjan Agricultural Research Center, Zanjan, Iran
چکیده [English]

For zoning of wheat grain yield, simple kriging, cokriging and regression- kriging methods were evaluated. For this purpose, in 2014, 298 rainfed wheat fields with distances of 0.59 km from each other were selected at the Khodabandeh county located in the south of Zanjan province. Wheat grain yield of the rainfed lands was measured using the quadrant plots in the field. Soil samples were collected from the surface soil (0-30 cm) of the fields at two replicates. Physical and chemical properties of soil including sand, silt, clay, moisture, organic matter, pH, EC, calcium carbonate equivalent, total nitrogen, available phosphorus and plant-available potassium were measured. Soil data were used to assess the geostatistical models and evaluate the soil characteristics roles on wheat grain yield over the fields. Out of total data, 238 data were used to develop geostatistical models and 60 data were applied to test the models. Results showed that cokriging estimated wheat grain yield in new locations more accurate (R2= 0.74, RMSE= 118.95) than the simple kriging (R2= 0.74, RMSE= 127.87) and regression- kriging (R2= 0.26, RMSE= 198.84). Soil total nitrogen was used as auxiliary variable in cokriging method to determine the spatial variation of wheat grain yield. In addition, according to the results by understanding the spatial variation of the soil total nitrogen spatial grain yield variation can be quantified and used as geostatistical map for management scopes.

کلیدواژه‌ها [English]

  • Cokriging
  • Kriging
  • Principal component analysis
  • Regression-Kriging
 
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