. Check-list of the species of fishes known from the Philippine Archipelago. Fishes. SOIL MOISTURE 265 given soil at different depths. This is apparently due to the fact that the dense covering of vegetation prevents the surface soil from drying out at a much more rapid rate than the deeper layers. The average percentages for four-week periods at a depth of 20 centimeters in the parang and in the dipterocarp and midmountain forests are plotted in fig. 14. In this curve Periods of four weeks ending— Jon3l MayttJuneZOJuly 18 Aug. 15 OctIO QecSJanZ. &
. Check-list of the species of fishes known from the Philippine Archipelago. Fishes. SOIL MOISTURE 265 given soil at different depths. This is apparently due to the fact that the dense covering of vegetation prevents the surface soil from drying out at a much more rapid rate than the deeper layers. The average percentages for four-week periods at a depth of 20 centimeters in the parang and in the dipterocarp and midmountain forests are plotted in fig. 14. In this curve Periods of four weeks ending— Jon3l MayttJuneZOJuly 18 Aug. 15 OctIO QecSJanZ. &30 Fig. 14. Average weekly percentage of soil moisture on Mount Maquiling at a depth of 20 centimeters at different altitudes. the wilting coefficient of the soil in the dipterocarp forest is shown as a straight line. The wilting coefficient of only one soil has been plotted, as the coefficients for the soils in the dip- terocarp and midmountain forests are exactly the same and that for the parang is only per cent lower than that of the other two. So slight a difference is within the limits of error indi- cated by the different values obtained by the use of the two methods employed in calculating the coefficient. For conven- ience in comparison, the wilting coefficient for the soil of the dipterocarp forest may, therefore, be considered the same as that for the other two Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jordan, David Starr, 1851-1931; Richardson, Robert Earl, 1877- joint author. Manila, Bureau of printing
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfishes, bookyear1910
