Diurnal variations of soil evaporation δ18O and factors affecting it in cropland in North China Error analysis of CO2 storage flux in a temperate deciduous broadleaved forest based on different scalar  variables. PHOTOSYNTHETIC CHARACTERISTICS IN LEAVES OF LITCHI CHINENSIS RESPONSES OF PHOTOSYNTHESIS ON WATER STRESS FOR SHRUBS FROM TROPICAL RAIN FOREST AND SUBTROPICAL MONSOON FOREST Recovery of vegetation in subtropical monsoon evergreen broad -leaved forestⅠ.Principle:Response of Photosynthesis of plants on different disturbed forestlands to environmental factors