نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه شهید مدنی آذربایجان

2 دانشگاه شهید مدنی اذربایجان

چکیده

آگاهی در مورد توزیع مکانی ویژگی­های خاک نقش مهمی در سیستم رشد و عملکرد محصول در بخش کشاورزی دارد. در این راستا جهت افزایش دقت در توزیع مکانی pHخاک، الگوریتم ژنتیک در ترکیب برآوردهای رگرسیون خطی، برنامه­ریزی بیان ژن (GEP) و زمین­آمار (درون­یابی کریجینگ) در مناطقی از استان آذربایجان­شرقی (شهرستان­های بناب، عجب­شیر و مراغه) مورد استفاده قرار گرفت. مدل نیم­تغییرنمایخطی در درون­یابی کریجینگ دارای کمترین مقدار خطااست. برنامه­ریزی بیان ژن و رگرسیون خطی به­ترتیب در برآورد توزیع مکانیpHخاک، کمترین و بیشترین مقدارخطا را دارند،میزان کاهشمیانگین مربع خطا، خطای جذر میانگین مربعات، خطای جذر میانگین مربعات نسبیاز رگرسیون خطی به زمین­آمار بهترتیب 67/47،58/27 و 47/26 درصد و میزان کاهششاخص پراکندگی و میانگین درصد خطای مطلق تعدیل شده از رگرسیون خطی به برنامه­ریزی بیان ژن به­ترتیب 8/23 و 03/37 درصد است.روش ترکیبیبا استفاده از الگوریتم ژنتیک نسبت به سه نوع مدل­سازی، خطای برآورد توزیع مکانی pHخاک را کاهش می­دهد­،به­عنوان نمونه میزان کاهشمیانگین مربع خطا، خطای جذر میانگین مربعات، خطای جذر میانگین مربعات نسبیاز مدلبرنامه­ریزی بیان ژن به روش ترکیبی به­ترتیب برابر با 33/23،76/11­ و 10 درصد است. برآوردهای pHبا روش ترکیبی در محدوده قلیایی می­باشد که با مقادیر اندازه­گیری شدههم­خوانی دارد. کمینه و بیشینه مقدار قدر مطلق اختلاف بین مقادیر اندازه­­­گیری و تخمینی در نقاط مورد­بررسی به­ترتیب در بناب(09/0) و عجب­شیر (25/0)می­باشد.معیار میانگین درصد خطای مطلق در روش ترکیبی در محدوده قابل­قبول از نظر عملکرد است و این مسئله کارایی روش مورد­استفاده را در برآورد توزیع مکانی پ­هاشخاک نشان می­دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Genetic Algorithm Application for Soil pHSpatial Distribution Estimation with Geostatistics and Gene Expression ProgrammingCombination

نویسندگان [English]

  • Reza Ahadi 2
  • Fatemeh Seyyed Milani 1

1

2 Azarbaijan Shahid Madani University

چکیده [English]

Awareness about spatial distribution of soil properties plays an important role in the system of crop growth and yield in the agricultural field. In this regard, genetic algorithm was used to increase the accuracy in spatial distribution of soil pHwhich combines the estimates of linear regression, gene expression programming (GEP) and geostatistics (kriging interpolation) with data related to some parts of East Azerbaijan province (Bonab,Maragheh and Ajabshir). The linear model of kriging interpolation had the minimum error. Gene expression programming and linear regression had the lowest and highest error for soil pH spatial distribution estimation, respectively, for example the mean square error, root mean square error, relative root mean square errordecreasing from linear regression to geostatistics was 47.67%,27.58%, 26.47% and scatter index and adopted mean absolute percentage error decreasing from linear regression to GEP was 23.8% and 37.03%, respectively. The use of genetic algorithm in combination method reduced the error of spatial distribution compared to the tree types of models, for example mean square error, root mean square error, relative root mean square errordecreasing from GEP to combination method was 23.33%, 11.76%,10%, respectively. The estimates of soil pH with combination method are in the alkaline range, which is consistent with the obtained data.  The minimum and maximum value of the absolute difference between measured and estimated data were at point in Bonab (0.09) and Ajabshir(0.25), respectively. The mean absolute percentage error of combination method was in acceptable range and this shows the efficiency of combination method for soil pH spatial distribution estimation.

کلیدواژه‌ها [English]

  • Spatial distribution
  • Genetic algorithm
  • Gene expression programming
  • Geostatstic
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