Soil Respiration Dynamics and Influencing Factors in Typical Steppe of Inner Mongolia under Long-term Nitrogen Addition

doi:10.5814/j.issn.1674-764X.2019.02.006

Abstract

Abstract:

We investigated soil respiration (Rs) dynamics and influencing factors under different nitrogen (N) addition levels (0, 2, 4, 8, 16, 32 g m^-2 yr^-1) on typical grassland plots in Inner Mongolia. We measured soil respiration, temperature, moisture and nutrients. We found that N addition did not change dynamic characteristics of Rs; daily and seasonal dynamics followed a single peak curve. N addition reduced Rs during the growing season. Rs under N2, N4, N8, N16 and N32 treatments decreased by 24.00%, 21.93%, 23.49%, 30.78% and 28.20% in the growing season, respectively, compared to the N0 treatment. However, Rs in the non-growing season was not different across treatments. Rs was significantly positively correlated with soil temperature and moisture and these two factors accounted for 72%-97% and 74%-82% of variation in Rs, respectively. The soil respiration temperature sensitivity (Q₁₀) was between 2.27 and 4.16 and N addition reduced Q₁₀ except in the N8 treatment.

Key words: soil respiration, nitrogen addition, soil temperature and moisture, soil nutrients, typical grassland

DU Wei,WU Shanmei,NIE Cheng,LI Yue,SHAO Rui,LIU Yinghui,SUN Nan. Soil Respiration Dynamics and Influencing Factors in Typical Steppe of Inner Mongolia under Long-term Nitrogen Addition[J]. Journal of Resources and Ecology, 2019, 10(2): 155-162.

Figures/Tables 8

Fig. 1 Daily dynamic curve of soil temperature and moisture in different months (mean ± SE)

Fig. 2 Seasonal dynamic curve of soil temperature and moisture (mean ± SE)

Fig. 3 Daily soil respiration rate in different months under different nitrogen additions (mean ± SE)

Fig. 4 Seasonal dynamic curve of soil respiration rate (mean ± SE)Note: * indicates a significant difference between at least two nitrogen addition treatments during the month.

Fig. 5 Dynamic soil respiration rate during the growing and non- growing seasons under different N addition levels (mean ± SE)Note: Different uppercase letters indicate significant differences in different nitrogen addition treatments during the growing season and lowercase letters for the non-growing season.

Table 1 Function fitting of soil respiration (Rs) and soil temperature and moisture

N addition (g m^-2 yr^-1)	Rs and soil temperature				Rs and soil moisture
N addition (g m^-2 yr^-1)	Formula	R²	P	Q₁₀	Formula	R²	P
0	Rs = 0.2245e^0.1417^T	0.97	<0.01	4.13	Rs = 0.014M^1.646	0.76	<0.01
2	Rs = 0.3851e^0.0945^T	0.75	<0.05	2.57	Rs = 0.017M^1.499	0.80	<0.01
4	Rs = 0.2385e^0.1250^T	0.96	<0.01	3.49	Rs = 0.013M^1.600	0.75	<0.01
8	Rs = 0.1736e^0.1425^T	0.95	<0.01	4.16	Rs = 0.015M^1.535	0.75	<0.01
16	Rs = 0.4146e^0.0819^T	0.72	<0.05	2.27	Rs = 0.013M^1.560	0.82	<0.01
32	Rs = 0.3644e^0.0927^T	0.77	<0.05	2.53	Rs = 0.014M^1.530	0.74	<0.01

Table 2 Pearson correlation between soil nutrients and soil respiration (Rs)

	DOC	MBC	NH₄⁺-N	NO₃^--N	TON	pH
Rs (August 2016)	-0.079	0.604**	-0.582*	-0.483*	0.088	0.615**
Rs (December 2016)	0.378	-0.076	0.390	0.149	-0.226	-0.154

Table 3 Pearson correlation between nitrogen (N) addition and soil nutrients

	N addition (August 2016)	N addition (December 2016)
DOC	0.207	0.613**
MBC	-0.676**	-0.841***
NH₄⁺-N	0.700**	0.753***
NO₃^--N	0.743***	0.656**
TON	-0.011	-0.335
pH	-0.962***	-0.951***

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