不同沙土配比对盆栽平邑甜茶的生长及^(15)N吸收、利用和损失的影响  

Effects of Different Sand/Soil Ratio on Growth and ^(15)N Absorption,Utilization and Loss of Potted Malus hupenhensis

作　　者：房祥吉[1] 姜远茂[1] 彭福田[1] 魏绍冲[1] 葛顺峰[1] 张大鹏[1] 崔同丽[1] 

机构地区：[1]山东农业大学园艺科学与工程学院,山东农业大学作物生物学国家重点实验室,山东泰安271018

出　　处：《水土保持学报》2011年第4期131-134,共4页Journal of Soil and Water Conservation

基　　金：现代农业产业技术体系建设专项(CARS-28);公益性行业(农业)科研专项(201103003);山东省农业重大应用创新课题(201009)

摘　　要：以当年生盆栽平邑甜茶为试材,应用15N同位素示踪技术研究不同沙土配比(不加沙、沙/(沙+土)=20%、40%、60%、80%、纯沙)对植株的生长及15N吸收、利用和损失的影响。结果表明:不同的沙土配比处理,平邑甜茶植株具有不同的生长状况及氮素吸收、利用和损失。沙土配比20%处理的植株生长量(株高、茎粗和总干重)最大(37.54 cm,3.457 mm和16.20 g),60%处理的全氮和15N吸收量最大,分别为189.31,32.39 mg,20%～60%处理下的生长量与氮素吸收、利用要显著高于不加沙和高沙处理(沙土配比>60%)。各处理的Ndff值和15N分配率均为地上部>地下部,20%～80%处理的植株各部分Ndff值随沙土配比的增大而增大。土壤中15N残留量与土壤沙土配比大小呈负相关,随着沙土配比增大,氮素总损失呈现增大的趋势。平邑甜茶植株生长和养分吸收、利用与土壤质地密切相关,适宜的沙土配比有利于植株的生长和氮素吸收、利用,较高的沙土配比加剧了土壤氮素损失。One-year-old Malus hupehensis grown in a pot were used in the present study to explore the effects of different sand/soil ratio（clay with no sand,sand/soil ratio=20%,40%,60%,80%,pure-sand）on growth and 15 N absorption,utilization,and loss using 15↑N trace technique.Results showed that there were different values of plant growth,15↑N absorption and utilization under different treatments.The value of plant growth（height,stem diameter and total dry weight）was highest（37.54 cm,3.457 mm and 30.46 g） under 20% treatment,while the total nitrogen and 15↑N uptake amount were greatest（189.31 mg and 32.39 mg） under 60% treatment,the value of plant growth and 15↑N absorption and utilization under 20% to 60% treatments were higher than that of clay with no sand and high sediment concentration（sand/soil ratio60%） treatments.The 15↑N Ndff and distribution of aerial part was higher than that of underground portion among different treatments.The Ndff of each part of plant becomes higher with the increases of sand/soil ratio under 20% to 80% treatments.Sand/soil ratio was negatively correlated with the residue level of 15↑N in soil,the loss of 15↑N showed a rising trend along with the increase of sand/soil ratio.The plant growth and nutrient uptake and utilization were closely related to soil texture.The appropriate sand/soil ratio was beneficial to the growth and nitrogen absorption and utilization,while higher ratio aggravated the nitrogen loss in soil.

关 键 词：平邑甜茶 沙土配比 15N 吸收 利用 损失 

分 类 号：S571.1[农业科学—茶叶生产加工]