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应用热脉冲技术测定了 3种不同砧木 (分别是 M9,MM1 0 6,Hashabi砧木 ) ,其冠层结构不同的果园 (分别是 M9,MM1 0 6,Hashabi果园 )苹果树的水分利用量 (汁液流量 )。结果表明 ,M9果园的水分利用比 MM1 0 6和 Hashabi果园低 ,并且 3种不同砧木苹果园测定的水分利用量与根据 A皿的灌溉量相关性差。矮化砧木 M9果园的冠层传导度最低 ,这与用气孔计测定照光叶的传导度低相符 ,因此它可能受到水分胁迫的影响。由于 M9果园是足量灌溉的 ,因此 ,M9果园苹果树任何水分胁迫可能不是灌溉不够 ,而是水分在茎或根内运输时阻力较高之故。
The heat-pulse technique was used to determine the water use of apple trees (M9, MM1 0 6, Hashabi rootstocks) and their orchard with different canopy structures (M9, MM1 0 6 and Hashabi orchards, respectively) flow). The results showed that the water use efficiency of M9 orchards was lower than that of MM1 0 6 and Hashabi orchards, and the correlation between the water use measured by apple orchards of 3 different rootstocks and the irrigation amount of A9 was poor. The dwarfing rootstock M9 orchard has the lowest canopy conductivity, which is consistent with the low conductivity measured by the stomata for illuminating leaves and therefore it may be affected by water stress. Because the M9 orchard is sufficiently irrigated, any water stress on apple trees in M9 orchards may not be inadequate for irrigation, but rather the resistance to water transport in stems or roots is high.