| 1. | The ability to adjust osmosis is : m . baccata > p . ussuriensis > a . ginnala > p . davidiana
山荆子和山梨渗透调节能力最强，茶条槭次之，山桃最弱。 |
| 2. | The improving degree of root proportion and root to shoot ratio is : a . ginnala > p . ussuriensis > p . davidiana > m . baccata
茶条槭在干旱胁迫下，根比重、根茎比增加幅度最大，山梨、山桃次之，山荆子最小。 |
| 3. | The photosynthesis of p . davidiana is the most tolerant to drought stress , p . ussuriensis and m . baccata are at second place , a
山桃光合作用对水分亏缺的忍耐性最强，山梨、山荆子居中，茶条槭光合作用对水分亏缺的忍耐性最差。 |
| 4. | The ability to maintain turgor and adjust osmosis is : m . baccata > p . ussuriensis > p . davidiana > a . ginnala . the ability of tolerating dehydration is : m
山荆子细胞忍耐脱水能力最强，山桃、山梨次之，茶条槭忍耐脱水能力最差。 |
| 5. | Under drought conditions , the decreasing degree of transpiration rate and the conduction of stoma is a . ginnala > m . baccata > p . ussuriensis > p . davidiana
在干旱胁迫条件下，茶条槭蒸腾速率和气孔导度降低幅度最大，山荆子、山梨次之，山桃最小。 |
| 6. | P . ussuriensis , p . davidiana and a . ginnala can adjust osmosis by improving the proportion of bound water , m . baccata adjust osmosis by decreasing the volume of cell and increasing content of solute
山梨、山桃、茶条槭能通过提高束缚水比例来实现渗透调节，山荆子通过细胞体积减小和增加溶质含量来实现渗透调节。 |
| 7. | Ginnala is the least tolerant to drought stress . p . davidiana ' s water use efficiency has increasing trend , but the other three species have decreasing trends . ( 4 ) the a . ginnala ' s leaves are sensitive to drought , but the others are not
四树种中只有山桃水分利用效率随土壤含水量的降低呈增长趋势； ( 4 )茶条槭叶片对水分变化敏感，在干旱胁迫下，叶片发生明显增厚现象，单株叶面积显著减少，其它三个树种的叶片不易被水分因子所影响。 |
| 8. | Ginnala ' s leaf becomes thicker and its leaf area of a plant decrease . the specific leaf area under drought conditions is : a . ginnala > p . davidiana > m . baccata > p . ussuriensis . ( 5 ) un der drought conditions , all of the four species have the abilities to adapting drought environment by increasing root biomass
茶条槭在干旱胁迫下比叶面积最高，山桃、山荆子次之，山梨最低； ( 5 )在水分胁迫下，四树种均能通过显著增加根量分配来适应干旱。 |
| 9. | The ability of maintaining maximum turgor and turgor is p . ussuriensis > m . baccata > a . ginnala > p . davidiana . the ability of maintaining turgor arose by elastic cell wall is a . ginnala > p . davidiana > p . ussuriensis > m . baccata . ( 3 ) with the decrease of soil moisture content , net photosynthetic rate of these four species and transpiration rate have the tendency of decreasing
茶条槭、山桃由细胞壁弹性所反映的保持膨压能力强，山梨、山荆子由细胞壁弹性所反映的保持膨压能力弱； ( 3 )随土壤含水量的降低，四树种净光合速率、蒸腾速率均呈降低趋势。 |
