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出苗-拔节期是玉米营养生长的主要阶段,研究出苗-拔节期干旱对玉米生物量的影响至关重要。利用2013-2015年山东夏津、河北固城和山西运城三个试验点夏玉米大田控水试验资料,研究了华北夏玉米出苗-拔节期重度干旱(T1,土壤湿度<40%),轻度干旱(T2,土壤湿度40~60%)及正常状态(CK,土壤湿度>60%)对玉米生物量的影响。结果表明:(1)出苗-拔节期不同程度的干旱对于夏玉米各生物量指标具有不同程度的影响,总体表现为重度干旱(T1)>轻度干旱(T2)>正常状态(CK);(2)叶、茎、根对出苗-拔节期干旱的响应不同,叶、茎、根的鲜重的敏感性高于干重;茎对干旱的敏感性最大,其次为叶,根最小;(3)出苗-拔节期不同程度干旱使生物量指标损失率不同。T1与CK相比,损失率平均为60%,T2与CK相比,损失率平均为46%。
The emergence-jointing stage is the main stage of corn vegetative growth. It is very important to study the effect of emergent-jointing drought on corn biomass. Using summer maize field control experiment data from 2013 to 2015 in Xiajin, Hebei and Gucheng, Yuncheng, we studied the effects of severe drought (T1, soil moisture <40%), mild drought (T2, soil moisture 40-60%) and normal state (CK, soil moisture> 60%) on the biomass of maize. The results showed that: (1) Different degrees of drought during emergence and jointing stages had different degrees of impact on the biomass of summer maize. The overall performance was severe drought (T1)> mild drought (T2)> normal state (CK) 2) The responses of leaves, stems and roots to emergence-jointing drought were different. The fresh weight of leaves, stems and roots were more sensitive than dry weight. The stems were the most sensitive to drought, followed by leaves and roots. ) Emergence - different degrees of drought at jointing stage so that the biomass loss rate indicators. T1 compared with CK, the average loss rate of 60%, T2 and CK, the average loss rate of 46%.