Abstract: This paper study evapotranspiration(ET)of typical grassland(Themeda japonica community)using largescalenon-weighing lysimeter and micro-lysimeter in Taihang Mountains .The results showed that the total ET was 730.4mm by large-scale non-weighing lysimeter during entire growing season .But ET of micro-lysimeter was 753.6 mm .Byanalysis between ET and leaf area index(LAI), correlation of ET and LAI is significant at the 0.05 level(2 -tailed)forThemeda japonica community ,The questions of ET and LAI was :ET =31.672LAI -47.424 , R =0.616 。Comparisonwith two measure , correlation of ET of per unit LAI among two measures is significant at the 0.05 level(2 -tailed), questionsof two measures was :ETm=0.803ETl+10.916 ,R =0.854

Key words: Evapotranspiration, Themeda Japonica, Community lysimeter

CLC Number: 

• Q948