Investigation of natural regeneration of Shisham reservery in Khuzistan provience

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Background and objectives: In past years the lack of accurate understanding of exist resource and use of uncontrol and illegal led to many valuable natural resources are being destroyed completely abolished or placed in such a way that exploitation They consistently unavailable,so that stable use of them is not possible. Undoubtedly, natural forest reserves in Khuzestan province, which is one of the valuable natural resources of the country are also not been spared. One of the major tree species in these forests were destroyed critically endangered species is Shisham ) Dalbegia sisso(.The purpose of this investigation, study and evaluation of regeneration and seeds germination in site of Dalbegia sisso.
Materials and methods: In order to investigate the natural regeneration of Dalbergia sisso reservery, the natural regeneration in 30 micro plots (3*3 m) was investigated randomly. So the qualitative and quantitative properties of seedling were measured and investigated respectly. Also in order to investigate the condition of seed germination of Shisham trees, the seeds were collected from the mature trees and from the ground floor, as wet seeds and dry seeds respectively, and sent to Khazar laboratory of seed. The physical properties of seeds such as germination capacity, viability percent and suitable treatments for seeds germination were determined in the laboratory. For comparison of different treatments, the ANOVA and Tukey test were used.
Results: The results showed that the highest rate of natural regeneration on the floor height more than 100 cm and a height of less than 25 cm is the lowest in class. The study of natural regeneration in Shisam natural reserves showed the regeneration in reservery was only the root sucker. Shishama qualitative study showed that the highest percentage of natural regeneration of trees in floor height of less than 25 cm and the lowest percentage in more than 100 cm height classes respectively. Seed test results indicated that if the seeds are sown in cold water immediately and without treatment, after three weeks with an important loss of viability 7 percent. Moreover, if the dry seeds are sown in cold water immediately and without treatment, after three weeks of treatment lowest viability and eight days in the cold water would be the highest viability.
Conclusion: The quantitive and qualitative investigation of natural regeneration showed that the maximum of qualitative percent were seen in height class of below 25 and the minimum of qualitative percent were seen in height class of above 100 cm. The results of seeds germination tests and viability showed that seeds Shishman cold water without treatment with the lowest percentage of seed viability (5%) and the treatment of cold water for 8 days had the highest viability (39%).