作物光温生产力模型

作物光温生产力模型

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Initial contribute: 2018-12-04

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Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
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Application-focused categoriesNatural-perspectiveLand regions
Application-focused categoriesHuman-perspectiveEconomic activities
Application-focused categoriesIntegrated-perspectiveRegional scale

Model Description

Chinese {{currentDetailLanguage}} Chinese

作物光温生产力模型

(1) 发育阶段模型:

 发育速度(V)的模型:

                    

   

式中,Sdv为发育阶段,设移栽期为0,成熟期为1。对于逐日平均的模拟模型,T为日平均温度;Ld为日长;对于从一再至成熟的模拟,当抽穗以后感光性为0,令Ld=Ld0。据有关研究,水稻抽穗之前,Tmax=40℃,Tmin=12℃;此后分别为41℃和14℃;p,q为参数。

         对于逐日模拟可写为离散形式:

                                 

         模拟结果表明各发育期对应的Sdv是稳定的。

(2) 光合作用,呼吸作用模型:

 净光合作用速率:

                      

式中,Pg是总光合速率;Rd是暗呼吸速率,分别为生长呼吸和维持呼吸两部分与光合作用有关,rg为生长呼吸系数,取值为0.05Rm与植株干重及温度有关。

      维持呼吸强度与温度的关系一般用温度函数Q10表示,即:

                      

式中,Q10=2Q100.0011

      作物的光合作用有最低(Tmin)、适(Top)和最高(Tmax)的三基准点温度。对于光温影响的光合作用模型的一本形式为:

                      

式中,F(T)为温度函数,可表达为

                   

三基准点温度随生育阶段变化,对于杂交水稻,一般Tmin10~12℃,Top24.5~26.5℃,Tmax40~44℃。

(3) 叶面积指数和衰老模型:

 叶面积指数随生育期和干物重变化的同意模型:

            

式中,分别是生育期t时叶面积指数、实际干物质重和标准干物质重;其他为拟合参数;的意义是标准情况下的可能最大叶面积指数。

(4) 干物质转换分配模型和衰老模型:

 光合产物转化为植物干重的转换系数(Fcv)随生育期变化,即:

                 

                   

水稻营养生长期内,根冠比为0.18~0.12,详细表达为,

                           

                                     

           当日地上部的干物质增量:

                   

         植株叶片的衰老表现为蛋白质的降解,叶绿素减少,RNA含量下降,最后原生物质膜的选透性丧失。植物生长曲线的s曲线大体也反映出后期的衰老,可以用方程Gomptertz表述:

                    

式中,W为干物重;t=0时的相对生长率(RGR0);s为经验描述的相对生长率的逐渐降低的参数;RGR的较低在营养生长期可归因于生存竞争,在生殖生长期可归因于衰老,可表达为:;类似的,Pd为考虑衰老后的冠层日干物质增长量,可表达为:

                   

参考文献:

    于强等:作物光温生产力模型及南方水稻适宜生长期的数值分析。自然资源学报,1999,142

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How to Cite

《资源环境数学模型手册》 (2018). 作物光温生产力模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/cc07d05e-bb26-4fe3-ac94-c26c53e68306
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Contributor

Initial contribute: 2018-12-04

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Authorship

Affiliation:  
岳天祥编著
Email:  
yue@lreis.ac.cn
Homepage:  
View
Is authorship not correct? Feedback

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Last modifier : 
wzh
Last modify time : 
2020-11-07
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