{"id":142904,"date":"2020-12-28T20:32:58","date_gmt":"2020-12-28T17:32:58","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/novel-method-to-quantify-decomposition-of-rhizodeposits\/"},"modified":"2020-12-28T20:32:58","modified_gmt":"2020-12-28T17:32:58","slug":"novel-method-to-quantify-decomposition-of-rhizodeposits","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/novel-method-to-quantify-decomposition-of-rhizodeposits\/","title":{"rendered":"#Novel method to quantify decomposition of rhizodeposits"},"content":{"rendered":"

“#Novel method to quantify decomposition of rhizodeposits<\/strong>”<\/p>\n

\n
\n
\n
\"soil\"
\n Credit: CC0 Public Domain
\n <\/figcaption><\/figure>\n<\/div>\n<\/div>\n

Rhizodeposition of labile organic carbon is one of the main pathways linking above- and below-ground biota to affect soil carbon cycling. Rhizodeposition is also a strategic physiological process for plants to cope with environmental stress, such as nutrient deficiency and drought, via the interaction with microbes. Nevertheless, separating decomposition of rhizodeposit carbon from root respiration in intact plant-soil systems has not yet been achieved due to methodological limitations, even though rhizosphere respiration has been intensively investigated.<\/p>\n


\n <\/section>\n

Recently, Prof. Jiang Yong’s Lab from the Institute of App<\/a>lied Ecology of the Chinese Academy of Science<\/a>s (CAS) used a novel approach to separate soil respiration into root respiration, decomposition of rhizodeposit carbon, and decomposition of soil organic carbon (SOC). <\/p>\n

The researchers applied a 13<\/sup>C pulse label to intact plant-soil cores and measured \u03b413<\/sup>C values of the separate components of soil respiration simultaneously (i.e., root respiration, decomposition of rhizodeposit carbon, and decomposition of SOC). Then, two-source isotopic mixing models were used to sequentially separate root respiration and then decomposition of rhizodeposit carbon from total soil respiration rates in planted pots. <\/p>\n

They found that the cumulative rhizodeposit carbon decomposition and root respiration, respectively, accounting for 7-31% and 52-76% of the cumulative soil respiration. <\/p>\n

“The cumulative rhizodeposit carbon decomposition was of a similar magnitude to the cumulative SOC decomposition, indicating that rhizodeposit carbon decomposition is a fundamental process that should not be overlooked in studies of the terrestrial carbon cycle,” said Prof. Jiang. <\/p>\n

Related results entitled “A novel 13<\/sup>C pulse-labeling method to quantify the contribution of rhizodeposits to soil respiration in a grassland exposed to drought and nitrogen addition” has been published online in New Phytologist<\/i> as a methods paper. <\/p>\n

This study was financially supported by the Australian Research Council, the National Natural Science Foundation of China, and the Youth Innovation Promotion Association of CAS.<\/p>\n\n

\n

Research explores the relationship between nitrogen and carbon dioxide in greenhouse gas emissions\n <\/p><\/div>\n

\n
\n More information:<\/strong>
\n Ruzhen Wang et al. A novel 13 C pulse\u2010labelling method to quantify the contribution of rhizodeposits to soil respiration in a grassland exposed to drought and nitrogen addition, New Phytologist<\/i> (2020). DOI: 10.1111\/nph.17118<\/a><\/p><\/div>\n
\n Provided by
\n Chinese Academy of Sciences
\n
\n <\/svg><\/a><\/p><\/div>\n

<\/p>\n

\n

Citation<\/strong>:
\n Novel method to quantify decomposition of rhizodeposits (2020, December 28)
\n retrieved 28 December 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-12-method-quantify-decomposition-rhizodeposits.html<\/p>\n

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n