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Quantification of the sources of soluble organic N ( SON ) from new litter or indigenous soil in a typical subtropical forest
Author(s) -
Ding Xianqing,
Chang Yue,
Hou Hongbo,
Peng Peiqin,
Xiang Wenhua
Publication year - 2021
Publication title -
land degradation and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.403
H-Index - 81
eISSN - 1099-145X
pISSN - 1085-3278
DOI - 10.1002/ldr.3909
Subject(s) - litter , plant litter , soil carbon , subtropics , chemistry , tropical and subtropical moist broadleaf forests , nitrogen , environmental science , zoology , agronomy , soil water , ecosystem , ecology , biology , soil science , organic chemistry
Decomposition of forest litter plays a major role in nitrogen (N) dynamics in soil. However, the effect of new litter on indigenous soil N and its contribution to soil N in natural forest remains unknown. An in situ soil column experiment was conducted and 15 N labelled litter was added to decompose for 14 months to examine the effect of litter retention on soil N dynamics in a typical subtropical forest. Litter removal in the soil column was used as a control. The results showed that litter removal caused a continuous decrease in concentration of soil soluble organic N (SON) in the first 5 months (August in 2018‐January in 2019), and SON concentration went up in the eighth month. Litter retention accelerated the reduction of soil SON concentration in the first 2 months, and SON concentration maintained a high value after that period. Soil NH 4 + ‐N derived from litter was nitrified rapidly, and the newly formed NO 3 − ‐N was quickly immobilized or lost. Only 1.8% of soil SON came from litter N and 98.2% from indigenous soil N under the decomposition of labelled litter. Litter provided N to form new soil SON continuously, however, only a small part of SON was relatively stable. Soil SON and total N (TN) are formed after long‐term litter accumulation and decomposition, and litter retention plays an important role in soil N dynamics.