Effect of Grazing on Diurnal and Seasonal Dynamics of Soil Respiration Rate of Leymus secalinus Communities

doi:10.11983/CBB15064

Abstract

Abstract: Soil respiration, as a key process in soil CO₂ emission, is strongly affected by land-use change. To explore the factors affecting carbon cyclic processes of Leymus secalinus communities under grazing, we measured diurnal and seasonal dynamics of soil respiration by the closed static chamber technique (LI-840a) during 2012 and 2013 to provide some basis for the rational use of L. secalinus communities. Furthermore, we analysed the correlation of soil respiration and air temperature, soil temperature, and soil moisture content. Diurnal and seasonal dynamics of soil respiration rate showed a unimodal distribution, with the peak value occurring at about 13:00 and the lowest at 4:00; the peak soil respiration rate appeared in July and August and the lowest in May, June and September. During the growing season, grazing could reduce the soil respiration rate, but the trend in rate did not significantly change. Diurnal dynamics of soil respiration rate was significantly correlated with air temperature. Seasonal dynamics of soil respiration rate was mainly regulated by the temperature of the 0- to 10-cm soil layer. We found an exponential model that could simulate the relationship between soil respiration rate and surface-layer temperature. Using the model, the caculated R_s were 1.040 8e^0.086^T^s (fencing plots) and 1.016e^{0.075 2}^T^s (grazing plots). Temperature was the main factor affecting the soil respiration rate of L. secalinus communities, and grazing could decrease the soil respiration rate by changing the surface layer temperature.

Huisen Zhu, Gang Li, Kuanhu Dong, Xiang Zhao, Wenjun Gao, Guohua Ren, Jia Mi. Effect of Grazing on Diurnal and Seasonal Dynamics of Soil Respiration Rate of Leymus secalinus Communities[J]. Chinese Bulletin of Botany, 2015, 50(5): 605-613.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB15064

https://www.chinbullbotany.com/EN/Y2015/V50/I5/605

Figures/Tables 7

Figure 1 Diurnal dynamics of soil respiration rate in Leymus secalinus communities with grazing and fencing patterns(A) Fencing plots in 2012; (B) Grazing plots in 2012; (C) Fencing plots in 2013; (D) Grazing plots in 2013

Figure 2 Seasonal dynamics of soil respiration rate in Leymus secalinus communities with grazing and fencing patternsDifferent small letters indicate significant difference between difference plots in the same time at 0.05 level.

Figure 3 Seasonal dynamics of air temperature in Leymus secalinus communities with grazing and fencing patternsDifferent small letters indicate significant difference between difference plots in the same time at 0.05 level.

Figure 4 Seasonal dynamics of soil temperature at 0-10 cm depth in Leymus secalinus communities with grazing and fencing patternsDifferent small letters indicate significant difference between difference plots in the same time at 0.05 level.

Figure 5 Seasonal dynamics of soil water content at 0-10 cm depth in Leymus secalinus communities with grazing and fencing patternsDifferent small letters indicate significant difference between difference plots in the same time at 0.05 level.

Table 1 Relativity between diurnal dynamics of soil respiration rate and temperature in Leymus secalinus communities

Year	Time (Month-Day)	Fencing plots						Grazing plots
Year	Time (Month-Day)	Ts	Ta	Regression equation	R²	Q₁₀	Ts	Ta	Regression equation	R²	Q₁₀
2012	5-20	0.370	0.918**	Rs=1.277e^0.042^T^a	0.786	1.52	0.336	0.948**	Rs=1.453e^0.035^T^a	0.883	1.42
	6-19	0.670*	0.924**	Rs=1.353e^0.041^T^a	0.892	1.51	0.858**	0.942**	Rs=1.2536e^0.044^T^a	0.912	1.55
	7-15	0.813**	0.885**	Rs=3.842e^0.021^T^a	0.761	1.23	0.804**	0.902**	Rs=3.048e^0.024^T^a	0.813	1.27
	8-18	0.929**	0.846**	Rs=2.648e^0.028^T^a	0.737	1.32	0.768*	0.973**	Rs=1.792e^0.044^T^a	0.951	1.55
	9-24	0.925**	0.903**	Rs=1.572e^0.044^T^a	0.782	1.73	0.959**	0.918**	Rs=1.132e^0.053^T^a	0.730	1.70
2013	5-14	0.510	0.923**	Rs=0.840e^0.068^T^a	0.882	1.97	0.539	0.941**	Rs=1.065e^0.050^T^a	0.930	1.65
	6-15	0.656*	0.783*	Rs=3.065e^0.024^T^a	0.637	1.27	0.687*	0.858**	Rs=2.114e^0.032^T^a	0.754	1.38
	7-15	0.686*	0.873**	Rs=2.142e^0.042^T^a	0.741	1.52	0.705*	0.890**	Rs=1.257e^0.039^T^a	0.747	1.48
	8-13	0.784*	0.881**	Rs=4.318e^0.019^T^a	0.779	1.21	0.694*	0.921**	Rs=3.737e^0.019^T^a	0.853	1.21
	9-15	0.734*	0.833**	Rs=2.299e^0.020^T^a	0.753	1.22	0.688*	0.814**	Rs=2.088e^0.025^T^a	0.678	1.28

Figure 6 Relationship between seasonal dynamics soil respiration rate and temperature and the content of water in Leymus secalinus communities(A) Relationship between soil respiration rate and air temperature in fencing plots; (B) Relationship between soil respiration rate and air temperature in grazing plots; (C) Relationship between soil respiration rate and soil temperature at 0-10 cm depth in fencing plots; (D) Relationship between soil respiration rate and soil temperature at 0-10 cm depth in grazing plots; (E) Relationship between soil respiration rate and soil water content at the 0-10 cm depth in fencing plots; (F) Relationship between soil respiration rate and soil water content at the 0-10 cm depth in grazing plots

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