宁夏南部山区春小麦生产潜力计算模型

宁夏南部山区春小麦生产潜力计算模型

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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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Method-focused categoriesData-perspectiveGeostatistical analysis
Method-focused categoriesProcess-perspectiveHuman-activity calculation

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Chinese {{currentDetailLanguage}} Chinese

宁夏南部山区春小麦生产潜力计算模型

(1) 宁夏南部山区春小麦光温生产潜力y(Q,T)的计算:

时:

           时:

              

式中,CL=0.5,是叶面积订正系数;CN=0.6,是作物干物质生产量校正系数;CH=0.46,是当地春小麦的收获系数;G=120d,是是作物生长期天数;ym是在一定气候条件下作物干物质生产率,是温度和作物种类的函数。Y0yc分别为全阴天和全晴天时的作物总干物质生产量。F是白天中云的覆盖率,由下式计算:

                    

式中,Rse为晴天最大入射短波辐射Q是实测入射短波辐射,考虑到宁南山区地形复杂且海拔较高(都在1500m以上),故对Q的推算采用了能进行海拔高度订正的理想辐射Qm作为初始值,用周围的银川,兰州等8辐射站的辐射资料建立方程:n是实测日照时数;N是一天内可能的日照时数,,ω是日末时角,δ是太阳赤纬,i是某一天在一年中的序号(i=1,2,…,365)Qm可由下式决定:

                   

式中,QdQi分别是理想直接辐射和理想散射辐射;是大气上界波长为λ的太阳辐射;m是大气光学质量;是波长为λ的O3透明系数;是波长为λ的不含O3的空气透明系数;ΔCCO2O2吸收的订正值,I0是太阳常数;a,b是待定系数,式中,有关辐射项的单位都转化成蒸发当量(mm)(1mm247)。

(2) 宁夏南部春小麦气候生产潜力y(Q,T,W)的计算:

  Doorenbos模型求算作物气候生产潜力过程如下:

  春小麦需水量Em

              

式中,Kc是作物系数;E0是蒸发力,,Δ是气温为t时的饱和水汽压曲线的斜率H是净辐射量,γ是干湿球参数Ea是干燥力

     由于宁南山区海拔都在1500m以上,故式中,对γ做了如下处理:

                    

式中,Cp是空气定压比热P是本站气压(hPa);ε=0.622是水汽分子量与干空气分子量的比值;L是水的汽化潜势P0=1013.3hPa,是海平面气压;Z是海拔高度(m);a=1.273,是气体膨胀系数;t是气温()

      春小麦各生育期实际耗水量Er的计算:

      当生育期降水量P加前期土壤有效水分含量Ws减去地表径流量f大于需水量Em时,Er=Em,同时土壤有剩余水分储存;当时,

      春小麦候潜力的计算:

                  

式中,In是春小麦最后剩余阶段的产量指数。

参考文献:

    乃至,李军,赵新平等:春小麦生产潜力与持续发展――以宁夏南部山区为例。自然资源学报,1997,123

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How to Cite

《资源环境数学模型手册》 (2018). 宁夏南部山区春小麦生产潜力计算模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/6710c3a5-f307-4627-b26d-0003c9af7a95
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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 : 
2020-11-01
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