Soil physical properties and leaf photosynthetic characteristics in three stands,Betula platyphylla forest,Quercus liaotungensis forest,and Betula platyphylla-Quercus liaotungensis mixed forest,which were located in the secondary zone of Ziwuling Forest of the Loess Plateau,were studied.It was shown that(1) Betula platyphylla-Quercus liaotungensis mixed forest had a remarkably improved soil moisture,the lowest soil bulk density and the highest soil porosity,and was superior over the pure forests,i.e.in the ...
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