根际通气对基质气体、肥力及黄瓜伤流液的影响

为改善根际气体环境，试验采用基质通气栽培方式，研究不同通气方式对基质气体、肥力及黄瓜伤流液的影响。结果表明，基质底部通气和基质上部通气均显著改善根际二氧化碳和氧气体积分数，二氧化碳体积分数比对照降低33.31%～98.02%，氧气体积分数比对照提高2.13%～12.22%。通气处理显著提高基质速效养分质量分数，碱解氮比对照提高12.95%～28.87%，速效磷比对照提高12.02%～20.46%。基质上部通气处理的伤流液流量、电导率值和伤流液氨基酸含量均最高，表明基质上部通气处理根系代谢旺盛，是较理想的基质通气方式。

Effects of rhizosphere aeration on matrix gas, matrix nutrition and xylem sap in cucumber

In order to improve gas environment in rhizosphere, the effects of different patterns of rhizosphere aeration on matrix gas, matrix nutrition and xylem sap in cucumber by matrix-gas-cultivation were investigated. The results showed that concentrations of CO2 and O2 in rhizosphere both upper and lower aeration treatments were significantly improved, compared with CK, CO2 concentrations decreased by 33.31%-98.02%, and O2 concentrations increased by 2.13%-12.22%. Both upper and lower aeration treatments heightened significantly available nutrition contents, compared with CK, alkali-hydrolyzable nitrogen increased by 12.95%-28.87%, available phosphorus increased by 12.02%-20.46%. Electrical conductivity, pH value and amino acids of xylem sap in upper aeration treatment were the highest, which showed a strong root metabolism, so upper aeration pattern was better.