Abstract
The rubber tree physiological and ecological process quantitatively described by using mathematical method is an important means to the analysis of rubber tree growth process and mechanism. The study on growth simulation model of rubber tree will lay the foundation for the application of rubber tree cultivation intelligent decision system. A Richards equation was formulated to describe the height and stem diameter growth dynamics of the annual rubber seedlings. An area correlation analysis was done according to the closeness of the observed parameters to the dynamic curve on the gray system composed of the seedling growth increment and the meteorological factors including aerial temperature, precipitation and solar radiation hours that influence upon the seedling growth. The results showed that rubber seedling response fitted the Richards equation quite well. The growth increment displayed a distinct alternation of slow—fast—slow— fast—slow rhythm. The growth course of the seedlings might be partitioned into three periods of time by the sequential clustering analysis, namely pre-growing, fast-growing, late-growing stage. The tray correlation analysis revealed that air temperature had the most significant influence while precipitation had the least impact on height growth of the rubber seedlings. In conclusion, the air temperature had the most significant influence while solar radiation hours had the least impact on stem diameter growth of the rubber seedlings.
Highlights
Height growth and diameter growth is an important part in vegetative growth of crops, the growth of the pros and cons is directly related to crop growth and yield quality
The vegetative growth of rubber tree (Hevea brasiliensis) mainly includes the stem diameter and the height growth, which is main index to measure the rubber tree growth, forest uniformity, whether rubber trees reach the standard for open tapping, and an important basis for rubber production technology and economic management [1]
Studying on dynamic and related model of rubber tree growth, some scholars have carried out some research work; rubber tree girth growth model was respectively established, and Richards model was considered good for simulating rubber tree growth [6] [7]
Summary
Height growth and diameter growth is an important part in vegetative growth of crops, the growth of the pros and cons is directly related to crop growth and yield quality. The vegetative growth of rubber tree (Hevea brasiliensis) mainly includes the stem diameter and the height growth, which is main index to measure the rubber tree growth, forest uniformity, whether rubber trees reach the standard for open tapping, and an important basis for rubber production technology and economic management [1]. Mathematical model between the per area yield of dry rubber and rubber tapping tree was established [10]. Rubber seedlings period of high growth and diameter growth dynamic rhythm still have little understanding; cultivating robust seedling is the foundation of rubber seedling production. Study on growth regularity of seasonal variation of rubber seedling will help to deepen understand rubber saplings growth rhythm, and provide the reference basis for field cultivation and management measures to carry out the scientific seedling. The results will produce reference for the rubber tree seedling cultivation and production
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