loading page

Bidirectional nitrogen transfer, nodulation, and growth in an intercropping system of Eucalyptus and Dalbergia odorifera
  • +4
  • Xianyu Yao,
  • Uromi Goodale,
  • Mei Yang,
  • Liangning Liao,
  • Sufang Yu,
  • Shengqiang Wang,
  • Shaoming Ye
Xianyu Yao

Corresponding Author:[email protected]

Author Profile
Uromi Goodale
Guangxi University
Author Profile
Mei Yang
Guangxi University
Author Profile
Liangning Liao
Guangxi University
Author Profile
Sufang Yu
Guangxi University
Author Profile
Shengqiang Wang
Guangxi University
Author Profile
Shaoming Ye
Author Profile

Abstract

We measured bidirectional N transfer and quantified the amount of transferred N between Eucalyptus urophylla × grandis (Eucalyptus) and Dalbergia odorifera (Dalbergia), to determine whether the facilitation process from N transfer could improve Eucalyptus productivity and nodulation of Dalbergia. A 15N leaf-labeling study was conducted by using a pot experiment with Dalbergia and , and 15N was traced in the labeled species as well as in neighboring trees at 90, 135 and 180 days after labeling. Bidirectional N occurred between Eucalyptus and Dalbergia, the amount of net transferred N was 21.8–127.0 mg plant-1 N from Dalbergia to Eucalyptus, which was equal to 1.5–21.2 % of the total N accumulated in Eucalyptus plants to increase the biomass of Eucalyptus. The results also showed that the nodule number of Dalbergia increased by 19.4–107.4 % in the intercropping system and further improved its N2-fixation. The concentration of soil nitrogen, especially the concentration of N-NH4+, was a major factor affecting N transfer in this system. This study indicated that the advantage in Eucalyptus and legume intercrops relates to ‘complementary N use’, which provide a significant amount of N required for Eucalyptus productivity, and maintain ecological sustainability.