The role of fine root morphology in nitrogen uptake by riparian plants
The role of fine root morphology in nitrogen uptake by riparian plants
复制标题
细根形态在河岸植物氮吸收中的作用
DOI：
10.1007/s11104-021-05270-8
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发表时间：
2022-01-21
期刊：
影响因子：
4.9
通讯作者：
Zhang, Chao
中科院分区：
文献类型：
--
作者：
Lu, Bianhe;Qian, Jin;Zhang, Chao
在农业流域，沿河道保持的河岸缓冲层降低了农业径流中的氮浓度，从而改善了水质。研究河岸植被在相关过程中的作用，将有助于深入了解河岸带保持土壤氮的机制。方法在太湖流域测量菖蒲、美人蕉和芦苇5种土壤深度（0-15、15-30、30-45、45-60和60-75 cm）下植物氮吸收比例、细根（直径< 1mm）生物量和细根形态。结果氮素吸收最多的土层为0 ~ 15 cm(50.8±1.0、56.0±1.4和37.5±3.2%)；菖蒲,C。分别为籼稻和青豆)。45 ~ 75 cm对p的氮吸收。comis（21.2±2.2%）显著高于a。菖蒲(14.9±0.7%)并且。着指数（9.2±1.5%）（P< 0.05）。结果表明，氮素吸收量与比根表面积（SRA，P< 0.05）和比根长（SRL，P< 0.01）等根系形态特征成正比，但不同树种间关系不同。土壤深度引起的环境因子变化强烈影响了一些根系形态指标（如细根生物量、平均直径(D)）。结论土壤环境因子和植物根系形态共同影响植物对氮的吸收。在河岸恢复项目的植被选择中，应优先选择SRL或SRA较高的植物，因为它们具有较高的氮吸收能力。但需要注意的是，SRL和SRA与植物氮吸收之间的正相关关系可能因植物种类而异。不同物种的优化选择和互补的养分吸收策略可以最大限度地提高不同土壤深度对氮素的吸收和农业径流对氮素的总体去除。
AimIn agricultural basins, riparian buffers maintained along stream channels reduce nitrogen (N) concentrations in agricultural runoff, thereby improving water quality. Investigating the role of riparian vegetation in the related processes will provide insights into the mechanisms by which riparian zones retain soil N.MethodsIn our study, the proportion of plant N uptake, fine root (diameter < 1mm) biomass and fine root morphology at five soil depths (0-15, 15-30, 30-45, 45-60, and 60-75 cm) forAcorus calamus,Canna indicaandPhragmites communiswere measured in Taihu Lake Basin.ResultsThe soil layer from which the majority of N was absorbed was 0-15 cm (50.8±1.0, 56.0±1.4 and 37.5±3.2% forA. calamus,C. indica, and P. communis, respectively). The N uptake from 45 to 75 cm forP. communis(21.2±2.2%) was significantly higher thanA. calamus(14.9±0.7%) andC. indica(9.2±1.5%) (P< 0.05). Our results showed that N uptake was directly proportional to root morphological characteristics such as specific root surface area (SRA,P< 0.05) and specific root length (SRL,P< 0.01), but the relationships varied among species. Changes in environmental factors caused by soil depth strongly influenced some of the root morphological indicators (e.g., fine root biomass, mean diameter (D)).ConclusionsSoil environmental factors and plant root morphology jointly influenced plant N uptake. During vegetation selections of the riparian restoration projects, plants with high SRL or SRA should be given priority due to their expected high capacity in N uptake. But cautions need to be taken as the positive relationships between SRL and SRA and plant N uptake may vary between plant species. Optimal selection of diverse species with complementary nutrient uptake strategies could maximize N uptake at various soil depths and overall N removal from agricultural runoff.