摘要
探究不同生物炭基肥施用量和干旱—复水环境下紫穗槐叶水势响应特征,为紫穗槐的栽培利用提供理论和技术支撑。通过盆栽试验,研究了不同生物炭基肥施用量(750 kg/hm^(2),1500 kg/hm^(2),2250 kg/hm^(2))和不同水分处理[100.00%土壤相对含水量(Soil relative water content),87.84%SRWC,70.00%SRWC,52.16%SRWC,40.00%SRWC]复水后紫穗槐苗木叶水势的响应特征。结果表明:在750 kg/hm^(2)、1500 kg/hm^(2)、2250 kg/hm^(2)生物炭基肥施用量下,随着土壤干旱程度加重,紫穗槐叶水势均呈下降趋势,水分胁迫指数呈上升趋势;40.00%SRWC处理的紫穗槐叶水势下降幅度达到最大,其中2250 kg/hm^(2)施肥量调控15 d干旱历时下40.00%SRWC处理组的叶水势下降幅度最大,相比对照下降了0.67 MPa。随着旱后复水时间的增加,紫穗槐叶水势逐渐恢复,恢复速率与干旱程度、干旱历时密切相关。复水6 d后,除30 d干旱历时下52.16%SRWC和40.00%SRWC处理的紫穗槐叶水势未恢复到对照水平,其余处理组的紫穗槐叶水势总体恢复到对照水平,出现补偿效应和超补偿效应。
To investigate the response characteristics of leaf water potential in Amorpha fruticosa seedlings under drought stress and rewatering,various amounts of biochar-based fertilizer were applied.Pot experiments were conducted in a greenhouse to evaluate the effects of different application rates of biochar-based fertilizer(750 kg/hm^(2),1500 kg/hm^(2) and 2250 kg/hm^(2)),different levels of water stress(100.00%,87.84%,70.00%,52.16%,and 40.00%soil relative water content),and rewatering conditions on leaf water potential in A.fruticosa seedlings.The results revealed that severe drought conditions led to a decrease in leaf water potential and an increase in the water stress index of A.fruticosa seedlings when biochar-based fertilizer was applied at rates of 750 kg/hm^(2),1500 kg/hm^(2) and 2250 kg/hm^(2).Among the treatments,the lowest leaf water potential in seedlings was observed under the 40.00%SRWC treatment.Notably,the application of 2250 kg/hm^(2) of biochar-based fertilizer resulted in a decrease of 0.67 MPa in leaf water potential after 15 days of drought stress.However,the leaf water potential of A.fruticosa seedlings exhibited recovery over time upon rewatering.A strong correlation was found between the severity of drought stress and the duration of the drought.Conversely,after 6 days of rewatering,the leaf water potential of A.fruticosa seedlings subjected to 30 days of drought stress did not fully recover to the control level in the 52.16%and 40.00%SRWC treatments.However,in the case of 15 days of drought stress,the leaf water potential of A.fruticosa seedlings recovered to the control level and even exhibited compensation and super-compensation effects.
作者
冯树林
周婷
王军利
FENG Shu-lin;ZHOU Ting;WANG Jun-li(Xianyang Polytechnic Institute,Xianyang,Shaanxi 712000;Xianyang Academy of Agricultural Sciences,Xianyang,Shaanxi 712000)
出处
《辽宁农业科学》
2024年第5期1-7,共7页
Liaoning Agricultural Sciences
基金
陕西省教育厅一般专项科研计划项目(22JK0609)
咸阳职业技术学院博士科研基金项目(2021BK05)
咸阳职业技术学院“双高计划”专项(2021SGC07)。
关键词
干旱胁迫
生物炭基肥
叶水势
复水
恢复
Drought stress
Biochar-based fertilizer
Leaf water potential
Rewater
Recovery
