盐化草甸植被净初级生产力模型

盐化草甸植被净初级生产力模型

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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 categoriesIntegrated-perspectiveGlobal scale

Model Description

Chinese {{currentDetailLanguage}} Chinese

盐化草甸植被净初级生产力模型

 

  1

 

 

式中,化草甸植被净初级生产力为可能蒸散(mm);h为地下水埋深(m);地下水蒸发的极限深度(m)。

 

对模型(1)进行关于地下水埋深h变化的灵敏度分析,以检验盐化草甸植被NPP对地下水埋深变化的反应。设为灵敏度指数,则:

 

  2

 

 

 

计算可能蒸散的公式:

  3

 

 

 

式中,

 

 

 

 

 

 

 

式中,为晴天总辐射为气温为时的饱和水汽压曲线斜率为气温为时的黑体辐射;为地表对长波辐射的吸收率;:干湿球温度表常数;为净辐射;为空气干燥项,与风速和空气饱和差有关;为温度为时的空气饱和水汽压为温度为时的平均水汽压为日照百分率;为实际日照百分率,为下垫面反射率;:地表风速为海拔高度;为海拔高度为是的气压

 

全球变化造成的气温升高,将使地表的能量收支平衡发生变化,由于是计算可能蒸散的关键项,因此它的变化将影响到。设:

 

   4

 

 

式中,为总辐射;为地表反射率;为长波有效辐射。

 

如果考虑到温度升高对的影响,而对空气干燥的影响则是改变空气饱和水汽压,则有:

   5

 

 

   6

 

 

  7

 

 

同理:

   8

 

 

将(5~8)式带入(3),便可取出全球变化造成温度升高后可能蒸散的改变量,从而可得:

 

 

 

式中,为全球变化后的可能蒸散(mm)。

 

参考文献

张宏:极端干旱气候下盐化草甸植被净初级生产力对全球变化的响应。自然资源学报,2001,163

How to Cite

《资源环境数学模型手册》 (2018). 盐化草甸植被净初级生产力模型, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/3a76dc15-c788-44af-8a2e-5f4563dc5f16
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Contributor

Initial contribute: 2018-12-04

Co-contributor(s)

Authorship

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

History

Last modifier : 
YY
Last modify time : 
2020-10-27
Modify times : 
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