| Comparing the model forms estimating generalised diameter-height relationships in Tecomella undulata plantations in hot arid region of India |
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| 引用本文： | Vindhya Prasad Tewari. Comparing the model forms estimating generalised diameter-height relationships in Tecomella undulata plantations in hot arid region of India[J]. 林业研究, 2007, 18(4): 255-260. DOI: 10.1007/s11676-007-0052-6 |
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| 作者姓名： | Vindhya Prasad Tewari |
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| 作者单位： | Forest Management Unit, Silviculture Division, P.O. Krishi Mandi, New Pali Road, Arid Forest Research institute, Jodhpur 342005, india |
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| 摘 要： | Four generalised diameter-height equations were developed and compared for pure and even-aged stands of Tecomella undulata in hot arid region of Rajasthan State in India. The data used to fit the equations consisted of 1 540 diameter-height observations collected from the plots laid out in uniformly stocked stands of varying age and density. The performance of four equations was tested by non-linear least squares regression and evaluated using different statistical criteria. Finally, these equations, with the same values of coefficients ob- tained during the fitting phase, were validated by an independent data set consisting of 854 diameter-height observations. Overall, equation （4） （Hui and Gadow function） was found to perform best for both the fitting data set as well as validation data set.
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| 关 键 词： | 沙漠地带 印度 种植物 高度 树直径 |
| 文章编号： | 1007/s11676-007-0052-6 |
| 收稿时间： | 2007-05-08 |
| 修稿时间： | 2007-07-08 |
Comparing the model forms estimating generalised diameter-height relationships in Tecomella undulata plantations in hot arid region of India |
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| Vindhya Prasad Tewari. Comparing the model forms estimating generalised diameter-height relationships in Tecomella undulata plantations in hot arid region of India[J]. Journal of Forestry Research, 2007, 18(4): 255-260. DOI: 10.1007/s11676-007-0052-6 |
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| Authors: | Vindhya Prasad Tewari |
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| Affiliation: | (1) Forest Management Unit, Silviculture Division, Arid Forest Research Institute, P.O. Krishi Mandi, New Pali Road, Jodhpur, 342005, India |
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| Abstract: | Four generalised diameter-height equations were developed and compared for pure and even-aged stands of Tecomella undulata in hot arid region of Rajasthan State in India. The data used to fit the equations consisted of 1 540 diameter-height observations collected from the plots laid out in uniformly stocked stands of varying age and density. The performance of four equations was tested by non-linear least squares regression and evaluated using different statistical criteria. Finally, these equations, with the same values of coefficients obtained during the fitting phase, were validated by an independent data set consisting of 854 diameter-height observations. Overall, equation (4) (Hui and Gadow function) was found to perform best for both the fitting data set as well as validation data set. Biography: Vindhya Prasad Tewari (1960–), in the Forest Management Unit, Silviculture Division, P.O. Krishi Mandi, New Pali Road, Arid Forest Research Institute, Jodhpur 342005, India |
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| Keywords: | Generalised height-diameter equations T. undulata Model evaluation & validation Hot desert India |
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