Volume 2, Number 3 (3-2014)                   DEEJ 2014, 2(3): 19-28 | Back to browse issues page


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Abstract:  

Biomass is a key factor in dynamics evaluation of ecosystems, biodiversity level and their
stability. Biomass measurement is performed every year to evaluate range ecosystems
(investigating the trend of changes), range management (suitable browsing systems) and cover
assessment in rangelands. As direct biomass measurement is time-consuming, has costs and
destroy rangelands non-destructive methods by modeling can be taken into consideration. On
the other hand, introduction of a suitable non-destructive method for biomass estimation that
has high speed and precision and low sampling costs has been of importance according to wide
areas of range ecosystems in dry parts of Iran, low vegetation cover and sensitivity to
destruction. This study was aimed to estimate the biomass of three range species of Polygonum
salicornioides, Astragalus ebenoides Boiss, and Astragalus coluteopsis Parsa by an ecological
model using a non-destructive method in Sepidan, Iran. The studied species were perennial.
Parameters of mean diameter of canopy cover, perimeter and height were used to determine the
ecological equations to estimate biomass. About 30 samples of each species were selected for
this purpose and measurements were performed in their blooming season. After the
measurement of these parameters for each species in the range, their biomass was determined
by cut-and-weight method and the ecological equations were constructed. The results showed
that the obtained equations were precise enough to estimate biomass due to their correlation
coefficient. Between the parameters of mean diameter of canopy cover, perimeter and height
mean diameter of canopy cover had the highest correlation with biomass. In all three species,
perimeter had the highest correlation after diameter. In general, the results showed that biomass
of each species can be estimated by measuring its mean diameter of canopy cover and using the
obtained equations for the studied species.

Type of Study: Research | Subject: Special
Received: 2013/04/14 | Accepted: 2014/02/9 | Published: 2014/03/6

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