人工种草地产量估算模型

人工种草地产量估算模型

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contributed at 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-perspectiveDevelopment activities

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Chinese {{currentDetailLanguage}} Chinese

人工种草地产量估算模型

1)在土壤肥力较高,水分供给充足,耕作管理精细的条件下,最大产量可按下式估算:

 

kg·hm-2·全生育期

 

式中,CH为收获指数,苜蓿第一年形成的干物质有50%在根部,随后各年为10%,因此,CH可取0.9;CT为温度订正系数,全生育期平均温度为5℃时取0,10℃时取0.2,15℃时取0.4,20℃时取0.55,25℃时取0.6,30℃时取0.6,35℃时取0.5;G为生长期,可用5℃初、终日间天数代表;ETmax为日最大蒸散量(mm);ea为饱和水汽压(mb);ed为实际水汽压(mb);y0=Fy0+(1-F)ycF=(Rsc-0.5Rs/0.8Rsc,Rs为实际射入的短波辐射(J·cm-2·d-1),Rsc为晴天射入的短波有效辐射(J·cm-2·d-1),y0为完全阴天情况下的标准作物干物质产量(kg·hm-2·d-1),yc为晴天情况下的标准作物干物质产量(kg·hm-2·d-1);K为苜蓿群体干物质产量经验修正系数,综合资料得到的数学表达式为:

(2)在土壤肥力、耕作管理措施较好,仅靠天然降水条件的旱地最大亩产可按下式计算:

kg·hm-2·全生育期

式中,ET为实际蒸散量(mm),在半干旱到干旱地区,土地平整耕作管理措施较好的耕地,可忽略从地表流走和渗透到耕作层之下的天然降水,这时可用天然降水量近似的代表实际蒸散量;ETmax为日最大蒸散量(mm),可用计算方法得到;KY为产量反应因子。

 

参考文献

候光良、陈沈斌,刘允芬: 宁夏天然草场产量与气候因子关系及人工草地产量估算自然资源学报1989,4(1)

 

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How to Cite

《资源环境数学模型手册》 (2018). 人工种草地产量估算模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/26200856-15fc-40dd-b77b-00a1914c32c9
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Last modifier : 
Zhiyi Zhu
Last modify time : 
2020-12-02
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Contributor(s)

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

History

Last modifier : 
Zhiyi Zhu
Last modify time : 
2020-12-02
Modify times : 
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