亏损量 meaning in English

defect
deficient number

And the precipitation decrease progressively and evaporation capacity greater and greater in mu us region . and the results indicate that it is more outstanding of the relationship between the moisture deficit and the current desertization situation and degree of aggravating of the main counties in this area
研究表明，本地区主要旗县水分亏损量与区域的沙漠化现状及加重程度的关系密切，水分亏损量大的地区，不仅沙漠化程度重，而且加重趋势明显。