مقايسه روشهاي مختلف برآورد توليد در چند گونه مهم بوته اي (مطالعه موردي مراتع استان يزد و اصفهان )

Cooperation of different yield stimation methods for some important shrub plants (The case study in Yazd and Isfahan provinces)

In the present study four methods for shrub production measurment were compared namely: Adelaide technique, Double sampling with usage of cover percentage for 20 and 25 percent direct sampling and clipping and weighing method. The result of clipping and weighing method was considered as index. Their Accuracy and time consumption were compared. For this purpose four species including Artemisia sieberi, Eurotia ceratoides, Salsola rigida and Aellenia subaphylla were selected. The result showed that the best method for all shrubs (except Aellenia subaphylla) was double sampling with 20% direct sampling. The Adelaide technique can be an accurate method for Aellenia subaphylla, because this plant is big in height with sparse distribution of twigs and branches. Therefore using cover information in the double sampling method is recommended as the best method for shrub production measurement.