The publication of this Handbook was supported by the Russian Federation

И
экол
 = ΔδЦ
 (6.2)  (6.2)
where:  Δδ  –  biodiversity  change  of   non-ameliorated  and  ameliorated  lands;  Δδ  =  δ1 – δ2. 
Biodiversity levels of  different agricultural lands are specified in Table 6.2.1.

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Soil salinity manаgement manual | Part I.Soil salinity management in the Eurasian Region 
Table 6.2.1. Relative levels of biodiversity of different agricultural lands, %
Forests, meadows, marshes
Forest belts
Orchards
Hay meadows and 
pastures
Cropland
100
49
23
60
10
Note: The biodiversity values are corrected with reference to the land productivity [2]
Financial investments into land amelioration are predetermined by the possibilities for the use of  
advanced and ecologically safe technologies and equipment. The NPV value is suitable for various 
assessments, but does not give information on the ecological stability of  agricultural landscapes.
An  objective  assessment  of   the  ecological  benefits  and  cost  effectiveness  of   land  amelioration 
measures should involve an additional parameter that characterizes the ecological stability of  
irrigated agricultural landscapes [2, 3]. The ecological stability can be evaluated by the use of  the 
following equation:
 (6.3)
 the coefficient of  ecological stability of  a natural floodplain ecosystem, unit fractions; fi – relative 
areas of  biotic and abiotic elements of  the ecosystem , %; К1 – coefficient characterizing the relative 
ecological significance of  ecosystem elements, unit fractions; К2 – coefficient of  ge o morphologi 
cal stabil ity of  f  loo d plain relief К2 = 0.7; ω – the total area of  floodplain, ω = 100 %.
Relative ecological significance coefficients are presented in Table 6.2.2.