A Comparison of Random-Systematic methods to Estimate seedling mortality in Aeolian Dust sources

Document Type : Research Paper

Authors

1 Assistant, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran

2 Assistant Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center (AREEO), Ahvaz, Iran

3 Assistant Professor, Rangeland Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran.

10.29252/aridbiom.2021.15269.1822

Abstract

This study was conducted in the aeolian dust sources of the southeast of Ahvaz to determine the best survival method for planted seedlings. Full calipering method (%100 inventory) used for 16.2 hectares planted seedling. Sampling sample-line methods were performed with a fixed number of trees (in intensities of 10 and 13%) and a sample plot with a fixed area in five sampling networks with different dimensions of the sample plot and three intensities of 5, 10, and 13%. Then, a one-sample t-test was used to compare the mean of each method with the percentage of survival in the %100 sampled method at a significance level of %95. According to the results of %100 statistics, the survival rate of seedlings planted in the field was %72.9. The results indicated that the sample-line method with an intensity of 13% (average of 80 holes per sample line) had the closest estimate (71.8%) to the percentage of real survival. Also, the 30×30 m sample plot method with 13% intensity and 70×100 m network dimensions showed the closest estimate (72.1%) to the real survival percentage. Results of the single sample t-test showed that the sample-line method with sampling intensity below 13% was not significantly different from the control. Among the studied methods, only methods E (10% fixed area with 90 ×100 grid dimensions) and G (13% fixed area with 90×100 grid dimensions) differed from the control. The lowest percentage of standard errors belonged to H (13% fixed area with 70×100 grid dimensions) and I (13% fixed area with 35×100 grid dimensions). The lowest percentage of standard errors belonged to H (13% fixed area with 70×100 grid dimensions) and I (13% fixed area with 35×100 grid dimensions). Totally, this study showed, the area sampling method is superior to the sample-line methods estimate the percentage of survival in the planted areas, and in general. It is suggested to use the H method (fixed area 13% with 70×100 grid dimensions) in forestry areas.

Keywords

References

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Journal of Arid Biome
Volume 10, Issue 2
March 2021
Pages 99-111

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