摘要： 采用盆栽试验,研究了不同生物炭用量(0,1%,5%,10%(w/ w)和不同氮肥水平(0,400,800 kg/hm²)及其交互效应对高粱(Sorghum bicolor (L.)Moench)苗期生长及有关生理特性的影响。结果表明,EC值低的土壤植株生长状况整体要优于EC值高的土壤;1%生物炭对作物生长略优于0处理,而5%和10%生物炭对高粱苗期生长具有抑制作用;不施氮肥与施400 kg/hm²氮肥间无显著差异,800 kg/hm²氮肥水平对植株生长产生抑制效应;生物炭用量、施氮量及其交互效应对2种土壤植株干质量均有显著影响;叶绿素的表现与其生长状况表现基本一致;还原糖含量受生物炭和氮肥影响表现不一;硝酸盐含量与氮肥水平呈显著正相关,与生物炭用量呈负相关。研究表明,低量生物炭(1%)有利于高粱种子发芽和幼苗生长,高量生物炭(5%和10%)和高氮水平(800 kg/hm²)在一定程度上抑制了高粱幼苗的生长;植株硝酸盐含量随生物炭施用量增加而相应减少,随氮肥水平提高而相应增加。

关键词: 生物炭, 氮肥, 高粱, 生理特性

Abstract: A pot experiment was conducted to evaluate the effect of biochar(Produced from corn stover)at application rates of 0,1%,5%,10%(w/w)and different nitrogen levels of 0,400,800 kg/ha and their interactions on early seedling growth and related physiological characteristics of sorghum (Sorghum bicolor (L.)Moench).The experimental results showed that the growth of seedlings in the low EC soil was better than the high EC soil as a whole.1% biochar was superior to the control for the seedling growth;however,5% and 10% biochar had inhibitory effect on sorghum seedling growth.There was no significant difference between two levels of 0,400,800 kg/ha level produced inhibition on the seedling growth.The effects of biochar application rates,N application levels and their interaction on seedling dry weight in both low EC and high EC soils were significant.The trend of influence of different treatments on sorghum seedling chlorophyll was consistent with the sorghum growth parameters change;the influence of different treatments on the plant reducing sugar was mixed.Nitrate content of sorghum was significantly positively related to the level of nitrogen fertilizer and negatively correlated with biochar dosage.This study indicated that low biochar application rate(1%)could stimulate seed germination and early seedling growth,higher biochar application rate(5% and 10%)and higher N application level(800 kg/ha)could inhibit seedling growth.Nitrate content in seedlings was decline with biochar rate increase,and increase with N level enhance.

Key words: Biochar, Nitrogen fertilizer, Sorghum, Physiological characteristics

中图分类号: 

• S156.2