高超,赵玥,赵燕东.基于微环境参数集的茎干水分变化规律与估算模型研究[J].农业机械学报,2017,48(12):292-298.
GAO Chao,ZHAO Yue,ZHAO Yandong.Variation Rule and Estimation Model of Stem Water Content Based on Micro-environment Parameter Set[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(12):292-298.
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基于微环境参数集的茎干水分变化规律与估算模型研究   [下载全文]
Variation Rule and Estimation Model of Stem Water Content Based on Micro-environment Parameter Set   [Download Pdf][in English]
投稿时间:2017-04-11  
DOI:10.6041/j.issn.1000-1298.2017.12.035
中文关键词:  杨树  茎干水分  微环境参数集  主成分分析法  斜椭圆模型
基金项目:国家自然科学基金项目(31371537)、北京市科技计划项目(Z161100000916012)和北京市共建专项
作者单位
高超 北京林业大学 
赵玥 北京林业大学 
赵燕东 北京林业大学 
中文摘要:以杨树为研究对象,通过分析茎干水分与微环境参数集的变化关系,提出了茎干水分的估算模型。采用主成分分析法选取微环境参数集的最大主成分PC1作为特征变量,解决了微环境参数集之间的共线性问题,并在保留98.89%的原始数据信息的同时,达到了数据降维的目的,从而降低了模型复杂度。以PC1作为输入变量,茎干水分作为输出变量,基于两者的周期性变化规律建立了茎干水分与PC1的斜椭圆模型。在微环境状况相近的6个晴天,该模型的平均误差小于0.05%,均方根误差小于0.06%,决定系数大于0.94,能够较好地依据微环境参数集估算出实时的茎干含水率。但是由于植株个体存在形态指标上的差异,不同植株茎干水分与PC1的斜椭圆模型的预估参数也会存在差异,针对不同季节和气象环境需要分别建立茎干水分的估算模型。
GAO Chao  ZHAO Yue  ZHAO Y  ong
Beijing Forestry University,Beijing Forestry University and Beijing Forestry University
Key Words:poplar tree  stem water content  micro-environment parameter set  principal component analysis method  oblique ellipse model
Abstract:Stem water content is an important parameter for evaluating plant physiological water conditions. Poplar trees were selected as research objects. The estimation model of stem water content was proposed by analyzing the variation relationship between stem water content and micro-environment parameter set. Considering the multi-collinearity between micro-environment parameter set, the maximum principal component PC1 of micro-environment parameter set was chosen as a feature variable via principal component analysis. The feature variable retained 98.89% of the original data information. In addition, the complexity of model was simplified by reducing the data dimension. PC1 as the input variable and stem water content as the output variable, the oblique ellipse model between the two was established. In six sunny days with similar micro-environment, the mean error of the model was less than 0.05%, root mean square error of the model was less than 0.06%, and decision coefficient of the model was greater than 0.94. The oblique ellipse model can precisely estimate real-time stem water content, but because of the differences in morphological indexes of poplar trees, the estimated parameters of different oblique ellipse models between stem water content and PC1 were different. Moreover, the estimation model of stem water content should be respectively established according to different seasons and weather environment.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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