Bibliographic Details
| Title: |
Different indicative roles of stable nitrogen isotope in soil N dynamics of tropical leguminous and non-leguminous forests following nutrient addition. |
| Authors: |
Mao, Jinhua1,2,3 (AUTHOR), Mo, Jiangming1,2 (AUTHOR), Zhang, Wei1,2 (AUTHOR), Huang, Juan1,2 (AUTHOR), Mao, Qinggong1,2 (AUTHOR) maoqinggong@scbg.ac.cn, Zheng, Mianhai1,2,4 (AUTHOR) zhengmianhai@scbg.ac.cn |
| Source: |
Plant & Soil. Aug2024, Vol. 501 Issue 1/2, p393-407. 15p. |
| Subject Terms: |
*NITROGEN isotopes, *SOIL dynamics, *STABLE isotopes, *TROPICAL forests, *PHOSPHORUS in soils, *EUCALYPTUS |
| Abstract: |
Aims: Plant and soil nitrogen (N) isotope ratios (δ15N) have been used as indicators of N cycling processes of ecosystems. However, the effects of N and Phosphorus (P) addition on δ15N values and their indicative roles in N-cycling in legume-dominated tropical forests remain poorly understood. Methods: We compared leguminous (Acacia auriculiformis) and non-leguminous (Eucalyptus urophylla) forests in terms of N concentration and δ15N in the leaf–litter–soil continuum under long-term N and P addition. Typical soil N-cycling processes, including rates of mineralization, nitrification, and N loss, were also examined to determine the differences between the corresponding 15N signatures observed in the leguminous and non-leguminous forests. Results: The plants in both tropical forests were found to be 15N-depleted. N addition significantly increased the foliage δ15N in understorey species in the non-leguminous but not the leguminous forest. In both forests, the addition of N resulted in an increase in nitrate (NO3−) leaching and nitrous oxide (N2O) emission. Conversely, P addition led to a decrease in NO3− leaching and N2O emission. Additionally, foliage δ15N was positively correlated with soil N loss rates (N2O emission and NO3− leaching) in the non-leguminous forest but showed no correlation in the leguminous forest. Conclusions: In contrast to the traditional convention derived from non-leguminous forests, our results suggest that foliar 15N isotope signals are not applicable for indicating the soil N dynamic status of leguminous forests. This study highlights the importance of distinguishing legumes from other plant species in terrestrial N-cycling models when incorporating 15N isotope signals. [ABSTRACT FROM AUTHOR] |
|
Copyright of Plant & Soil is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Academic Search Complete |
|
Full text is not displayed to guests. |
Login for full access.
|
