SOIL N2O EMISSION AND ITS RESPONSE TO SIMULATED N DEPOSITION IN THE MAIN FORESTS OF DINGHUSHAN IN SUBTROPICAL CHINA

doi:10.17521/cjpe.2006.0114

Abstract

Abstract:

Background and Aims Most studies of the consequences of enhanced nitrogen deposition on sources and sinks of greenhouse gases have been performed in temperate ecosystems. Little information is available about greenhouse gases and responses to atmospheric nitrogen deposition in subtropical and tropical forests, especially in the forests of China. The objective of this study was to determine soil N₂O emission and its response to simulated N deposition in pine forest (PF), pine-broadleaf mixed forest (MF), and monsoon evergreen broadleaf forest (MEBF) of Dinghushan in subtropical China.

Methods Four N addition treatments (in three replicates) were established in MEBF: Control, Low N (50 kg N·hm^-2·a^-1), Medium N (100 kg N·hm^-2·a^-1) and High N (150 kg N·hm^-2·a^-1), and three treatments were established in MF and PF (Control, Low N and Medium N).

Key Results The effects of nitrogen addition on soil N₂O emission differed by forest type. In MF, no significant differences were found among the three treatments after 3 months. In PF, however, soil N₂O emission rate was significantly higher in Medium plots than that in Low or Control plots, which exhibited no significant difference. In MEBF, soil N₂O emission rate was highest in High N plots and significantly higher in Medium plots than in Low or Control plots, which exhibited no significant difference.

Conclusions This study suggests that nitrogen addition significantly stimulated soil N₂O emission rates in both MEBF and PF, and its effect generally increased with the levels of nitrogen addition, but there was no such significant effect in MF.

Key words: N deposition, N₂O emission response, Subtropical forest, China

MO Jiang-Ming, FANG Yun-Ting, LIN Er-Da, LI Yu-E. SOIL N₂O EMISSION AND ITS RESPONSE TO SIMULATED N DEPOSITION IN THE MAIN FORESTS OF DINGHUSHAN IN SUBTROPICAL CHINA[J]. Chin J Plant Ecol, 2006, 30(6): 901-910.

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Figures/Tables 6

Table 1 Soil properties in pine, mixed and monsoon evergreen broadleaf forests of Dinghushan in subtropical China (mean, SE in parenthesis)*

森林类型 Forest type	土层深 Soil depth (cm)	有机质 Organic matter (%)	全氮 Total N (%)	碳氮比 C/N	pH	容重 Bulk density (g·cm^-3)	含水量 Moisture content (%)
马尾松林 PF	0~20	2.73 (0.17)	0.09 (0.01)	16.79 (0.94)	4.03 (0.02)	1.41 (0.04)	24.90 (1.10)
混交林 MF	0~20	3.45 (0.35)	0.10 (0.01)	18.90 (0.97)	3.86 (0.02)	1.30 (0.04)	25.97 (0.91)
季风林 MEBF	0~20	5.35 (0.58)	0.19 (0.01)	15.91 (0.86)	3.79 (0.06)	1.21 (0.03)	38.57 (1.19)

Fig.1 Comparisons of soil pH values, ammonium and nitrate conce-ntrations in different nitrogen treatments of pine (PF), pine-broadleaf mixed (MF) and monsoon evergreen broadleaf (MEBF) forests in subtropical China (n=12) Different letter means significantly different among treatments with the same forest and among forests within the same treatment at p=0.05 level

Fig.2 Changes of soil N2O emission of control plots with time in pine (PF), pine-broadleaf mixed (MF) and monsoon evergreen broadleaf (MEBF) forests in Dinghushan of subtropical China measured in October 2003

Fig.3 Dynamic of soil N2O emission of pine (PF), pine-broadleaf mixed (MF) and monsoon evergreen broadleaf (MEBF) forests in Dinghushan of subtropical China during the period of 1999 to 2002

Fig.4 Relationship of soil N2O emssion and soil temperature in pine (PF), pine-broadleaf mixed (MF) and monsoon evergreen broadleaf (MEBF) forests of subtropical China during the period of 2000 to 2001

Fig.5 Comparison of soil N2O emission in different nitrogen treatments of pine (PF), pine-broadleaf mixed (MF) and monsoon evergreen broadleaf (MEBF) forests in subtropical China (n=18) Different letter means significantly different among treatments with the same forest at p=0.05 level

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SOIL N₂O EMISSION AND ITS RESPONSE TO SIMULATED N DEPOSITION IN THE MAIN FORESTS OF DINGHUSHAN IN SUBTROPICAL CHINA

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