『Abstract
　Inorganic nitrogen deposition and leaching in stream water were monitored from January, 2001 to December, 2004 in a subtropical evergreen mixed forest in central-south China. The seasonal concentration and flux of inorganic nitrogen in bulk precipitation and stream water, seasonal mean net retention and stream water, seasonal mean net retention of nitrogen and net flux of H⁺ transformed by nitrogen were estimated and quantified in Shaoshan forest. The research results show that the correlation coefficient of fluxes between bulk precipitation and stream water is significant, with a coefficient 0.916 at the 0.01 level. Mean flux of inorganic nitrogen input are 2.62 g m^-2 a^-1 and 0.516 g m^-2 a^-1 in form of bulk precipitation and dry deposition respectively, and output in stream water is around 0.22 g m^-2 a^-1, which indicates that most of nitrogen input is reserved in the forest. Net retention of nitrogen reaches 2.916 m^-2 a^-1, just higher than other study plots over the world. Along with the translating of nitrogen (NH4⁺ - N and NO3^- - N), H⁺ is imported to the forest ecosystem at the same time. At our study plots, net flux of H⁺ transformed by nitrogen is about 73.57 mmol m^-2 a^-1. The positive value suggests that Shaoshan forest is still a finer buffering system to nitrogen deposition and it is far from nitrogen saturation in spite of the high nitrogen deposition.

Keywords: Concentration; flux; Inorganic nitrogen; Input-output; Saturation』

1 Introduction
2 Materials and methods
　2.1 Research site
　2.2 Sampling design and laboratory analysis
　2.3 Methodology
　2.4 Study tentative
3. Results and discussions
　3.1 Water fluxes and mean pH values in bulk precipitation (BP) and stream water (SW)
　3.2 Seasonal nitrogen concentrations in bulk precipitation and stream water
　3.3 Nitrogen fluxes in bulk precipitation and stream water in Shaoshan forest during 2001-2004
　3.4 Seasonal input-output budgets of inorganic nitrogen and net flux of H⁺ translating by nitrogen in Shaoshan forest
　3.5 Status of nitrogen saturation in Shaoshan forest
4 Conclusions
Acknowledgements
References

Table 3 Comparison of long-term average annhual budgets of inorganic nitrogen (g m^-2 a^-1) and net input of H⁺ (mmol m^-2 a^-1) by nitrogen transferring in Shaoshan forest with others

Country	Area	Years	Budget				ΔH+
			Water (mm)	NH4+ - N	NO3- - N	NH4+ - N + NO3-b - N
China (This study)	Shaoshan	2001-2004	789	1.973	0.943	2.916	73.57
Europaa (NITREX)	Sogndal	1984-1992	46	0.126	0.089	0.215	2.64
	Gardsjon（sの頭に゜、oの頭に¨）	1989-1994	176	0.364	0.714	1.078	-25
	Aber	1991-1994	238	0.616	-0.672	-0.056	92
	Alptal	1994	696	0.812	0.560	1.372	18
	Klosterhede	1991-1994	354	0.910	0.924	1.834	-1
	Solling	1990-1994	344	1.750	-0.364	1.386	151
	Speuld	1990-1994	261	3.444	-7.564	-4.120	786.30
	Ysselsteyn	1990-1994	303	4.494	-5.515	-1.021	714.90
Japaneseb	SG-FC	1987-1993	569	0.100	0.170	0.270	-5
	SG-FS		569	0.110	-0.010	0.100	8.57
	SG-KR1		638	0.300	0.070	0.370	16.43
	SG-KR2		706	0.170	0.250	0.420	-5.72
	SG-RO1		663	0.130	0.170	0.300	-2.86
	SG-RO2		675	0.150	0.180	0.330	-2.14
	SG-RO3		663	0.150	0.170	0.320	-1.43
	SG-RO4		649	0.040	0.250	0.290	-15
	KT-KM2		1043	0.180	0.110	0.290	5
	SG-YT		438	0.210	0.180	0.390	2.14
	SG-SM1		1017	0.420	0.330	0.750	6.43
	SG-AM2		1513	0.430	0.360	0.790	4.29
	IG-TB		842	0.500	-0.720	-0.220	87.14
	GM-OS1		712	＞0.480	-1.050	-0.570	109.29
	GM-OS2		660	＞0.480	-0.790	-0.310	90.72
	HK-TEFD		604	0.180	0.170	0.350	0.72
	HK-TEFC		682	0.090	-0.160	-0.070	17.86
United States	HBc	1992-1993	482	NA	NA	0.664	NA
	BBd,e	1988-1990	492	NA	NA	0.113	NA
	CKf	1985-1986	561	NA	NA	0.630	NA
Budget = input - output, NA no data aBredemeier et al. 1998 bMitchell et al. 1997 cLikens and Bormann 1995 dKahl et al. 1993 eNorton et al. 1994 fStoddard and Murdoch 1991