覆盖秸秆对梨树几项水分生理指标的影响

1997～ 1998年对梨园覆盖秸秆后的土壤含水量和叶片几项水分生理指标进行了测定。结果表明 ,秸秆覆盖后 ,能明显增加梨园不同土层的含水量 ,其中表层土含水量增加最多。这种效应在覆盖两年后及干旱季节表现更加明显。秸秆覆盖后 ,明显提高了叶片的水势、相对含水量、饱和渗透势和膨压消失点的渗透势 ,增大了细胞最大体积弹性模量

Effect of Straw Mulching on Water Physiological Parameters of Pear

Soil water contents and some leaf water physiological parameters in straw mulched and unmulched pear orchards were determined during 1997～1998.The results showed that the soil water contents in different layers in the mulched orchard were higher than those in unmulched orchard, and that especially the topsoil had much higher water content, which became more obvious when mulching for two years and in drying seasons. The leaf water potential, relative water content, osmotic potentials at full tougor and when losing tougor potential, and volumetric elastic modulus at full tougor of the covered trees were all higher than those of the check plants.