科研成果

Hydraulic lift by Juglans regia relates to nutrient status in the intercropped shallow-root crop plant

发布时间:2015-02-13点击率:1242

作者:ShouJia Sun, Ping Meng*, JinSong Zhang, Xianchong Wan, Ning Zheng, Chunxia He

期刊:Plant and soil

发表时间:2014

..页码:374:629–641

摘要:

Aims The objective of our study was to confirm ifhydraulic lift (HL) promotes nutrient uptake in fieldgrownplants in the same way as demonstrated previouslyin pot-grown plants.

Methods We conducted a field experiment in an agroforestrysystem, over an entire growing season thatincluded a dry period and a wet period. We used ashallow-root crop plant, mung bean (Vigna radiata L.),intercropped with walnut (Juglans regia L.) and jujube(Zizyphus jujube Mill.), as an indicator for the presenceof HL and its effects on nutrient uptake. To monitor HL,we artificially applied deuterium isotope to the deeproots of trees.

Results We demonstrated the presence of a naturalnitrogen, phosphorus, and potassium gradient alongthe soil depth, and the occurrence of HL, evidenced by deuterium signature in the shallow soil layers and V. radiata stem, only during the dry season. J. regia and Z. jujube both had deep root systems, but the formerspecies exhibited stronger HL to the shallow soil thanthe latter. Meanwhile, the upper soil layers of J. regiahad significantly higher moisture content, and theintercropped V. radiata had higher nutrient content.

Conclusion HL can facilitate water uptake by V. radiata from the upper soil layers in the field condition duringthe dry season, which relates to nutrient acquisition bythe crop.