放牧对赖草草地土壤呼吸日、季动态的影响

doi:10.11983/CBB15064

植物学报 ›› 2015, Vol. 50 ›› Issue (5): 605-613.DOI: 10.11983/CBB15064

放牧对赖草草地土壤呼吸日、季动态的影响

朱慧森¹, 李刚¹, 董宽虎¹, 赵祥^1,^*(), 高文俊¹, 任国华¹, 米佳²

¹山西农业大学动物科技学院, 太谷 030801
²山西大学黄土高原研究所, 太原 030006

收稿日期:2015-04-22 接受日期:2015-06-18 出版日期:2015-09-01 发布日期:2015-10-09
通讯作者: 赵祥
作者简介:
? 共同第一作者
基金资助:
中国科学院战略性先导科技专项(No;XDA05050403)和山西省科技攻关(No.20140311013-3)

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

Huisen Zhu¹, Gang Li¹, Kuanhu Dong¹, Xiang Zhao^1*, Wenjun Gao¹, Guohua Ren¹, Jia Mi²

¹College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801, Chin
²Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China

Received:2015-04-22 Accepted:2015-06-18 Online:2015-09-01 Published:2015-10-09
Contact: Zhao Xiang
About author:
? These authors contributed equally to this paper

摘要/Abstract

摘要： 土壤呼吸是土壤碳向大气排放的关键过程, 受土地利用变化的强烈影响。利用LI-840a静态箱法, 对放牧利用下赖草(Leymus secalinus)草地土壤呼吸速率日、季动态进行为期2年(2012-2013)的观测, 并分析其与大气、土壤温度和土壤含水量的相关性, 旨在为合理利用赖草草地提供依据。结果表明, 赖草草地土壤呼吸日、季动态均呈单峰型变化, 一天中的最高值出现在午间13点, 凌晨4点最低, 在生长季初的5-6月和生长季末的9月较低, 在生长旺盛期7-8月较高。放牧降低了土壤呼吸速率, 但并不改变土壤呼吸速率的变化趋势。土壤呼吸速率日变化与大气温度呈显著相关(P<0.05), 季节变化主要受0-10 cm土壤温度的调控。围封和放牧草地土壤呼吸速率可以分别用下列方程拟合: R_s=1.040 8e^0.086^T^s(R²=0.91, P<0.01); R_s=1.016e^{0.075 2}^T^s(R²=0.95, P<0.01)。经综合分析得出如下结论: 温度是影响赖草草地土壤呼吸速率的主要因素, 放牧通过改变土壤表层温度而降低土壤呼吸速率。

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.

朱慧森, 李刚, 董宽虎, 赵祥, 高文俊, 任国华, 米佳. 放牧对赖草草地土壤呼吸日、季动态的影响. 植物学报, 2015, 50(5): 605-613.

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. Chinese Bulletin of Botany, 2015, 50(5): 605-613.

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链接本文: https://www.chinbullbotany.com/CN/10.11983/CBB15064

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

图/表 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

图2 放牧与围封赖草草地土壤呼吸速率的季节动态不同小写字母表示同一时期不同草地利用方式下差异显著(P<0.05)。

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.

图3 放牧与围封赖草草地大气温度的季节动态不同小写字母表示同一时期不同草地利用方式下差异显著(P<0.05)。

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.

图4 放牧与围封赖草草地0-10 cm土壤温度的季节动态不同小写字母表示同一时期不同草地利用方式下差异显著(P<0.05)。

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.

图5 放牧与围封赖草草地0-10 cm土壤含水量的季节动态不同小写字母表示同一时期不同草地利用方式下差异显著(P<0.05)。

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.

表1 赖草草地土壤呼吸速率日变化与温度的相关性

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

图6 赖草草地土壤呼吸速率季节变化与温度和含水量的关系 (A) 围封样地土壤呼吸速率与大气温度的关系; (B) 放牧样地土壤呼吸速率与大气温度的关系; (C) 围封样地土壤呼吸速率与0-10 cm土壤温度的关系; (D) 放牧样地土壤呼吸速率与0-10 cm土壤温度的关系; (E) 围封样地土壤呼吸速率与0-10 cm土壤体积含水量的关系; (F) 放牧样地土壤呼吸速率与0-10 cm土壤体积含水量的关系

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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放牧对赖草草地土壤呼吸日、季动态的影响

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

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