نشریه علمی - پژوهشی مرتع و آبخیزداری
تعیین مناسب ترین شکل و اندازه پلات برای برآورد چند متغیر مرتعی در مراتع نیمه استپی

پژمان طهماسبی؛ عطاالله ابراهیمی؛ نبی الله یارعلی

دوره 65، شماره 2 ، شهریور 1391، ، صفحه 203-216

https://doi.org/10.22059/jrwm.2012.30012

چکیده
  Proper judgement on rangeland state needs appropriate sampling plan and accurately estimation of plant characteristics. Sample shape and size are critical issues in vegetation measurement. Thus, decision on appropriate quadrate shape that enables us to determine several parameters accurately and timely would increase sampling efficiency. Several criterias including accuracy, perimeter/area ratio, spent time for measurement, usability and ease of use as well as three variance and or covariance dependent criterias were used to decide on proper plot size to determine multi-variables of rangelands, ...  بیشتر