Low Nitrogen Retention in Soil and Litter under Conditions without Plants in a Subtropical Pine Plantation

• Main Authors: Yanmei Xiong, Xingliang Xu, Hui Zeng, Huimin Wang, Fusheng Chen, Dali Guo
• Format: Article
• Language: English
• Published: MDPI AG 2015-07-01
• Series: Forests
• Subjects: 15N tracer; added N interaction; N deposition; N addition; priming effect
• Online Access: http://www.mdpi.com/1999-4907/6/7/2387

Soil acts as a major sink for added nitrogen (N) in forests, but it remains unclear about the capacity of soil to immobilize N under conditions without plant roots and whether added N interacts with ecosystem N to affect N retention. We added 15NH415NO3 to in situ soil columns (with leaching) and leaf litter (without leaching) of two tree species in a subtropical Pinus elliottii plantation. Soil and litter were collected three or eight months after N addition to measure concentrations of indigenous and exogenous N. About 70% of exogenous N was retained in soil three months after N addition, of which 65.9% were in inorganic forms. Eight months after N addition, 16.0% of exogenous N was retained in soil and 9.8%–13.6% was immobilized in litter. N addition increased the mineral release and nitrification of soil indigenous N. Loss of litter indigenous N was also increased by N addition. Our results suggest that N deposition on lands with low root activities or low soil carbon (C) contents may lead to increased N output due to low N immobilization. Moreover, the effects of added N on ecosystem indigenous N may decrease the capacity of soil and litter in N retention.