摘要
为研究有机肥施用对废弃矿区饲料桑(Morus alba)根系形态的影响,探明根系形态与地上部分生长的关系。以饲料桑‘粤桑11号’(‘Yuesang No.11’)为试验材料,设置6个处理组,包括1个对照组,化肥(CK);5个试验组,沼液(T_(1))、牛粪(T_(2))、牛粪+沼液(T_(3))、蚯蚓粪(T_(4))和蚯蚓粪+沼液(T_(5)),测定各组饲料桑的产量、株高、相对生长速率和根系生长指标。结果表明:1)与CK相比,施用有机肥各组饲料桑鲜草产量显著提高(P<0.05),其中T5处理下,年鲜草产量最高,为21.49 t·hm^(-2);除沼液处理外,其余4组有机肥组株高相对生长速率均较CK组显著增加(P<0.05)。2)与CK相比,施用有机肥组饲料桑根长、根尖数和0~0.5 mm径级根长、0~0.5 mm径级根尖数显著增加(P<0.05),其中T_(5)处理下根长和0~0.5 mm径级根系最长,分别为CK的5.2倍和14.5倍;各有机肥处理组饲料桑分支数、交叉数和根表面积、根体积均显著增加(P<0.05)。3)与CK相比,施用有机肥组的比根长增加5.7%~115.9%;T_(2)、T_(3)、T_(4)和T_(5)组比根表面积分别增加4.1%、7.0%、38.7%和49.6%,有机肥组较CK组根系拓扑指数更趋向近于1。4)相关性分析发现,鲜草产量与比根长、比根表面积极显著正相关(P<0.01),与根长、根尖、拓扑指数和土壤氨态氮含量显著正相关(P<0.05)。综上,在废弃矿区中施用有机肥能够促进饲料桑根系生长和形态发育,且根系形态和土壤氨态氮含量影响地上部分生长,其中蚯蚓粪+沼液组合施肥对废弃矿区饲料桑生长促进效果最佳。
In this study,we aimed at investigating how organic fertilizer application could impact the root morphology of Morus alba in abandoned mining areas and examining the correlation between root morphology and growth.We used M.alba‘Yuesang No.11’as experimental material and established six treatment(i.e.,a control and five experimental)groups.We treated the control group with chemical fertilizer(CK),while the experimental groups with biogas slurry(T_(1)),cattle manure(T_(2)),cattle manure+biogas slurry(T_(3)),earthworm casts(T_(4)),and earthworm casts+biogas slurry(T_(5)).We measured M.alba yield,plant height relative growth rate,and root growth index in each group.We obtained the following results.First,compared to CK,the M.alba yield significantly increased in each organic fertilizer-treated group(P<0.05).The annual yield was the highest(21.49 t·ha^(-1))in the T5 group,and the plant height relative growth rate significantly increased in all the organic fertilizer-treated groups except for but T_(1)(P<0.05).Second,compared to CK,the root tip lengths and numbers as well as the root numbers with 0~0.5 mm diameter,significantly increased in the organic fertilizer group(P<0.05).We observed the highest root length and number with diameters of 0~0.5 mm in the T_(5) group,being 5.2 and 14.5 times higher than those in the fertilizer treatment group,respectively.The M.alba fork and cross numbers as well as root areas and volumes increased significantly(P<0.05)in all organic fertilizer-treated groups.Third,compared to CK,the specific root length of the organic fertilizer-treated groups increased by 5.7%~115.9%,and the specific root areas in the T_(2),T_(3),T_(4),and T_(5) groups increased by 4.1%,7.0%,38.7%,and 49.6%,respectively.Furthermore,the root topological indices of the organic fertilizer-treated groups were closer to 1 than that of the CK group.Finally,our correlation analysis unraveled a positive correlation between fresh grass yield and specific root length,specific root area(P<0.01),root length,root tip,topological index,and soil ammonium nitrogen content(P<0.05).In conclusion,organic fertilizer application in abandoned mining areas could enhance M.alba root growth and morphological development.Root morphology and soil ammonium nitrogen content affected the growth of above-ground parts.Finally,M.alba growth was the most enhanced by earthworm casts and biogas slurry application in abandoned mining areas.
作者
邱静芸
连海
陈荣强
雷小文
欧翔
钟云平
吴丽娟
张强
QIU Jingyun;LIAN Hai;CHEN Rongqiang;LEI Xiaowen;OU Xiang;ZHONG Yunping;WU Lijuan;ZHANG Qiang(Ganzhou Animal Husbandry and Fishery Institute,Ganzhou 341401,Jiangxi,China)
出处
《草业科学》
CAS
CSCD
北大核心
2024年第6期1336-1346,共11页
Pratacultural Science
基金
中央引导地方科技发展资金项目(20221ZDF03017)
江西省高层次高技能领军人才培养工程项目(赣人社发【2022】34号)
赣州市苏区之光人才计划项目(赣市才字【2023】10号)。
关键词
饲料桑
稀土废弃矿
蚯蚓粪
牛粪
根系生长
根系构型
Morus alba
abandoned rare earth mining areas
earthworm casts
cattle manure
root growth
root conformation