Yield model and yield table construction in Albizia (Albizia lebbeck (L.) under Western Agro Climatic Zone of Tamil Nadu, Southern India

Abstract

The woody legume, Albizia lebbeck, is native to tropical Asia, Africa and Northern Australia. Owing to its multi utility, it is widely planted as block plantation and in boundary across community lands. A field study was conducted by measuring biometric value of trees, viz., height, diameter at every 2 meters height using tree telescope. Besides biometric attributes, age was assessed in order to correlate the age-wise yield. The study was carried out in western agro-climatic zone of Tamil Nadu in different age classes of trees, viz., 1–5 years, 6–10 years, 11–15 years, 16–20 years, 21–25 years, 26–30 years and 31–35 years. The uniqueness of the present study is that, the yield model construction for Albizia was done for standard stem timber (Volume at diameter 20 cm overbark) and standard stem small wood (Volume between diameter limits of 20cm and 5cm both measured overbark). After computing the data and subjected for multiple linear regression analysis, the model was constructed, so as to develop yield table accurately for Albizia without the help of form factor. The study result developed two exclusive yield models namely standard stem timber yield model for Albizia was Y= (-1.212) + (-0.012* Age) + (6.506*Diameter) and standard stem small wood was Y= (-0.945) + (-0.045*Age) + (2.769*Diameter) + (0.262* No. of Branches). The prominence of the present study is that yield table computation for Albizia is possible accurately without destructive analysis and the cumbersome process of developing form factor.

Growth biometry of Farm grown teak (Tectona grandis Linn. F) in high rainfall zone of Tamil Nadu

“…The biometric parameters namely tree height and DBH (Diameter at breast height) were estimated for the above indicated age-classes in both boundary and block plantation of Teak. DBH of teak trees were measured at a standard height 1.37 m height of trees were measured from the ground level to the leading terminal tip using Laser Distance Meter (Ravi et al, 2019, Raviperumal et al, 2018 [11,12] , The volume of farm grown teak was estimated using the formula of Chaturvedi and Khanna (1982) and the results are expressed in cubic meter (m 3 ).…”

Yield model and yield table construction in Albizia (Albizia lebbeck (L.) under the western agro-climatic zone of Tamil Nadu, Southern India

“…This bene t is not frequently used when building yield tables for forestry crops. Some of the yield model prediction in farm grown trees was addressed in Azadirachta indica (Raviperumal et al 2017), Ailanthus excelsa (Ravi et al 2019), Ailanthus excelsa (Balasubramanian 2019), Tectona grandis (Suresh krishnan 2017) etc. A full grasp of the model's structure and the interactions between its components is necessary for model evaluation, which should cover all of the model's assumptions and components (Soares et al 1995).…”