摘要
通过麦冬盆栽试验,控制土壤水分(10%、30%、70%、100%,W/W),对麦冬生长特性、土壤碳氮磷生态化学计量特征、磷素形态以及磷酸酶活性等进行测定,并分析各测定参数之间的相关性.结果表明,随着水分含量的增加麦冬种植土壤总有机碳、全氮呈降低趋势,但是全磷含量呈上升趋势,土壤磷素各形态占比对水分梯度响应差异性不明显;土壤C/N、C/P、N/P 分别为 8.79～10.46、15.95～18.68和1.53～2.15,对水分梯度响应特性不同,均属于弱变异;30%水分处理土壤碱性磷酸酶活性显著高于其他 3 种水分处理(P<0.05),可以直接利用磷比例为52.76%,略高于其他水分组;在30%水分组中,麦冬生物量、总根长、叶片全磷含量显著高于其他处理组(P<0.05),根面积、叶绿素含量略高于70%水分组(P>0.05)且显著高于10%和100%水分组(P<0.05),100%水分组麦冬生长被显著抑制.30%水分梯度利于麦冬改善土壤质量,提高麦冬对土壤碳氮磷的利用,增加土壤对氮素的累积,利于其生长.
Abstract
The experimental water gradient(10%,30%,70%,100%,W/W)was controlled by the potted plant test,and the growth charac-teristics of Ophiopogon japonicus,and the soil carbon(C),nitrogen(N)and phosphorus(P)ecological stoichiometry,phosphorus forms and phosphatase activity were measured,and the correlation relationships between different measurement parameters were analyzed.The results showed that with the soil moisture content increasing,the total organic carbon and total nitrogen decreased in the soil,while total phosphorus increased,and the phosphorusformshad no significant correlation with the soil moisture content.The C/N,C/P,N/P were 8.79-10.46,15.95-18.68 and 1.53-2.15,respectively,and their response characteristics to water gradient,belong to weak variants,were variant.The soil alkaline phosphatase activity under 30%water treatment was significantly higher than that under other groups(P<0.05),and the propor-tion of directly available phosphorus was 52.76%,which was higher than other water groups.The biomass,total root length and total phos-phorus in the leaf of Ophiopogon japonicus under 30%water treatment were significantly higher than other treatment groups(P<0.05).The root area and chlorophyll content were slightly higher than those in the 70%water group(P>0.05)and significantly higher than those in the 10%and 100%water group(P<0.05),and the growth of Ophiopogon japonicus was inhibited under 100%water gradient.30%water gradient was conductive to improving soil quality and the utilization of soil carbon,nitrogen and phosphorus,increasing soil nitrogen accumulation and conductive to Ophiopogon japonicus growth.
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