Growth Rhythm and Individual Models of Wine Bamboo Plantation, Oxytenanthera braunii

LI Wei-cheng; WANG Shu-dong; ZHONG Zhe-ke; SHENG Hai-yan; ZHOU Yan

The authors studied the shoot growth rhythm of wine bamboo, Oxytenanthera braunii, which is of great economic importance in Tanzania and has been introduced to China recently. And also, individual-based model was used to delineate and capture the essence of the shoot growth system well enough addressing specific characteristics of parameters about the system. The results showed that the power function could be used to set up the relationship between leaf number and node number, which was the same as branch number after truncating. Compensation effect of mother individuals after transplanting was important for wine bamboo adapting to the semi-arid area in southwest China. The quadratic function could be used to express the relationship between the number of residual nodes with branch and the percentage of branch number contributing to the total number of the individual without truncating which was also shown by the percentage of leaf number. The probability distribution function such as Weibull and Gamma were used to simulate the distribution of branch and leaf number on each culm node after truncating and transplanting with stump. Results indicated that distribution curve was successfully simulated, and Weibull and Gamma functions gave the best answer compared with normal distribution. Repression models based on DBH (diameter at breast height) showed that the fitted curve of power functions was more significant than others except the groups of one-year-old culm and two-years-old branch. The height growth and dynamic germination process of shoots fitted to the sigmoid curve, which could be well described by Logistic equation. And both the processes of different levels were divided into three sub-periods like beginning, flourish and end periods according to the first and second order derivatives of Logistic equation. The shoots germination period lasted about 150 days, which was about from May to October and coincident with the local rain season essentially. The beginning sub-period finished at the 48-51 days, and flourishing sub-period arrived at the 69-72 days, then the germination speed was down and the end sub-period showed at the 90-93 days similarly, following the rules of slow-quick-slow, shoot individuals displayed Logistic growth and showed a significant plastic growth rhythm responding to the local rain season. Height growth of shoot lasted longer at beginning sub-period and spent more time before entering fast growth stage. Meanwhile, the slow growth stage lasted only 12 days. And the shoots in the end sub-period displayed the contrary behavior, which was threatened by the decreasing rainfall and low humidity. There were only two stages for shoots in the flourishing sub-period which was no initial stage and shoots entered the fast growth stage directly. The whole growth period was the shortest. So humidity was the main ecological factor influencing the growth of bamboo shoots. Understanding the advantage of plasticity response and its limits is of critical importance for numerous issues in ecology and evolution for O. braunii.

1. China National Bamboo Research Center, Hangzhou 310012, Zhejiang, China

2. Institute of Environmental Protection Science, Hangzhou City, Hangzhou 310014, Zhejiang, China

Received Date: 2010-09-17

Available Online: 2011-12-13

Abstract: The authors studied the shoot growth rhythm of wine bamboo, Oxytenanthera braunii, which is of great economic importance in Tanzania and has been introduced to China recently. And also, individual-based model was used to delineate and capture the essence of the shoot growth system well enough addressing specific characteristics of parameters about the system. The results showed that the power function could be used to set up the relationship between leaf number and node number, which was the same as branch number after truncating. Compensation effect of mother individuals after transplanting was important for wine bamboo adapting to the semi-arid area in southwest China. The quadratic function could be used to express the relationship between the number of residual nodes with branch and the percentage of branch number contributing to the total number of the individual without truncating which was also shown by the percentage of leaf number. The probability distribution function such as Weibull and Gamma were used to simulate the distribution of branch and leaf number on each culm node after truncating and transplanting with stump. Results indicated that distribution curve was successfully simulated, and Weibull and Gamma functions gave the best answer compared with normal distribution. Repression models based on DBH (diameter at breast height) showed that the fitted curve of power functions was more significant than others except the groups of one-year-old culm and two-years-old branch. The height growth and dynamic germination process of shoots fitted to the sigmoid curve, which could be well described by Logistic equation. And both the processes of different levels were divided into three sub-periods like beginning, flourish and end periods according to the first and second order derivatives of Logistic equation. The shoots germination period lasted about 150 days, which was about from May to October and coincident with the local rain season essentially. The beginning sub-period finished at the 48-51 days, and flourishing sub-period arrived at the 69-72 days, then the germination speed was down and the end sub-period showed at the 90-93 days similarly, following the rules of slow-quick-slow, shoot individuals displayed Logistic growth and showed a significant plastic growth rhythm responding to the local rain season. Height growth of shoot lasted longer at beginning sub-period and spent more time before entering fast growth stage. Meanwhile, the slow growth stage lasted only 12 days. And the shoots in the end sub-period displayed the contrary behavior, which was threatened by the decreasing rainfall and low humidity. There were only two stages for shoots in the flourishing sub-period which was no initial stage and shoots entered the fast growth stage directly. The whole growth period was the shortest. So humidity was the main ecological factor influencing the growth of bamboo shoots. Understanding the advantage of plasticity response and its limits is of critical importance for numerous issues in ecology and evolution for O. braunii.

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Reference (13)

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Growth Rhythm and Individual Models of Wine Bamboo Plantation, Oxytenanthera braunii

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通讯作者: 陈斌, bchen63@163.com

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