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Different responses of soil CO 2 and N 2 O emissions to simulated N deposition in forests with divergent N transformation characteristics
Author(s) -
Song Lei,
Zhang Jinbo,
Jin Guangze
Publication year - 2021
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12607
Subject(s) - nitrification , mineralization (soil science) , nitrogen cycle , chemistry , soil water , environmental chemistry , nitrogen , deposition (geology) , ammonium , ammonia , zoology , environmental science , soil science , geology , biology , paleontology , organic chemistry , sediment
Abstract CO 2 and N 2 O are important greenhouse gases that are related to soil mineralization–immobilization turnover and nitrification. To explore the responses of CO 2 and N 2 O emissions to N deposition in forests with different N transformation characteristics, CO 2 and N 2 O fluxes were measured in two NH 4 NO 3 fertilized plots. One plot was in a temperate pine plantation in Heilongjiang Liangshui National Nature Reserve (LS) with slow and minimally coupled mineralization–immobilization turnover and a high nitrification rate. The other plot was in a subtropical bamboo forest in the Fujian Daiyun Mountain National Nature Reserve (DY) in China with rapid and coupled mineralization–immobilization turnover but a low nitrification rate. The results showed that CO 2 emissions in the DY with a high mineralization rate were greater than those in the LS. Cumulative CO 2 emissions were significantly enhanced by N addition in DY, but in LS, they were not affected. The mean N 2 O fluxes in the control were 0.010 and 0.008 mg N m −2 hr −1 for LS and DY, respectively. High N addition stimulated N 2 O emissions in both LS and DY, but the response ratio for N 2 O flux in LS (8.6) was larger than that in DY (2.9). These results suggested that soils with rapid and coupled mineralization–immobilization turnover are beneficial to CO 2 emissions and their positive response to N deposition. A high nitrification rate contributed to high N 2 O emissions and the sensitive response of N 2 O emissions to N deposition.