封育对羊草草地土壤碳矿化激发效应和温度敏感性的影响

doi:10.3724/SP.J.1258.2012.01226

植物生态学报 ›› 2012, Vol. 36 ›› Issue (12): 1226-1236.DOI: 10.3724/SP.J.1258.2012.01226

封育对羊草草地土壤碳矿化激发效应和温度敏感性的影响

代景忠¹^,², 卫智军¹, 何念鹏²^,^*(), 王若梦³, 温学华², 张云海⁴, 赵小宁², 于贵瑞²

^1. 内蒙古农业大学生态环境学院, 呼和浩特 010019
^2. 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101
^3. 山西农业大学动物科技学院, 山西太谷 030801
^4. 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093

收稿日期:2012-07-31 接受日期:2012-09-03 出版日期:2012-07-31 发布日期:2012-11-28
通讯作者: 何念鹏
作者简介:* (E-mail: henp@igsnrr.ac.cn)

Effect of grazing enclosure on the priming effect and temperature sensitivity of soil C mineralization in Leymus chinensis grasslands, Inner Mongolia, China

DAI Jing-Zhong¹^,², WEI Zhi-Jun¹, HE Nian-Peng²^,^*(), WANG Ruo-Meng³, WEN Xue-Hua², ZHANG Yun-Hai⁴, ZHAO Xiao-Ning², YU Gui-Rui²

^1. College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Hohhot 010019, China
^2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
^3. College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, China
^4. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

Received:2012-07-31 Accepted:2012-09-03 Online:2012-07-31 Published:2012-11-28
Contact: HE Nian-Peng

摘要/Abstract

摘要：

土壤碳矿化(或土壤异养呼吸)的温度敏感性和激发效应是深入揭示土壤呼吸控制机理及其对未来气候变化响应与适应的重要研究方向。该文以自由放牧(FG0)、封育11年(FG11)、封育31年(FG31)的羊草(Leymus chinensis)草地为研究对象, 通过0、5、10、15、20、25 ℃培养, 探讨了封育对羊草草地土壤碳矿化激发效应和温度敏感性的影响。结果表明: 封育年限、添加葡萄糖、培养温度和培养时间对土壤碳矿化速率均具有显著的影响, 不同因素间存在显著的交互效应(p < 0.000 1)。FG0的羊草草地土壤碳矿化累积量显著高于FG11和FG31的, 在添加葡萄糖处理下也呈现相同的趋势。长期封育降低了羊草草地土壤碳矿化的激发效应。在添加葡萄糖后, 培养前7天的土壤碳矿化的激发效应随温度增加而增加, 增加2.28-9.01倍; 在整个56天培养期间, 激发效应介于2.21-5.10倍, 最高值出现在10或15 ℃。土壤碳矿化速率可用经典的指数方程来表示, FG0草地的土壤碳矿化的温度敏感性指数(Q₁₀)大于长期封育草地(FG11和FG31); 与未添加处理相比, 添加葡萄糖显著增加了土壤碳矿化速率的温度敏感性, 即在添加葡萄糖后土壤微生物呼吸受温度的影响更大。长期封育会降低羊草草地土壤的碳矿化速率、温度敏感性和激发效应, 从而降低土壤碳周转速率和释放速率, 使内蒙古地区长期封育草地仍然具有碳固持能力。

关键词: 碳固持, 封育, 草地, 土地利用方式, 激发效应, Q₁₀, 温度敏感性

Abstract:

Aims The temperature sensitivity and priming effect of soil respiration, or soil carbon (C) mineralization, have been important topics for global change ecology in recent decades. They can provide new evidence on the controlling mechanisms of soil respiration in future climate change. Our objective was to investigate the effect of grazing enclosure on the priming effect and temperature sensitivity of soil C mineralization in grasslands. Methods We selected three Leymus chinensis grasslands subjected to different grazing-exclusion durations in Inner Mongolia, i.e., grazing-free grassland (FG0), 11-year fenced grassland (FG11), and 31-year fenced grassland (FG31). We incubated the soils at 0, 5, 10, 15, 20, 25 °C, respectively. Important findings Enclosure duration, glucose addition, incubation temperatures and incubation time all had significant impact on soil C mineralization rate, and there were significant interaction effects among these factors (p < 0.000 1). The cumulative emission of soil C mineralization was significantly higher in FG0 than in FG11 and FG31, and showed the same trend after glucose addition. Long-term enclosure decreased the priming effect of soil C mineralization in L. chinensis grasslands. After glucose addition, the priming effect of soil C mineralization was about 2.28-9.01 times and increased with increasing temperature in 7-day incubation. In 56-day incubation, the priming effect was in the range of 2.21-5.10, with the highest value at 10 or 15 °C. The temperature sensitivity of soil C mineralization can be well depicted by classical exponential equations, and the temperature sensitivity index (Q₁₀) of soil C mineralization was higher in FG0 than in FG11 and FG31. Glucose addition significantly increased Q₁₀, which indicated that soil microbial respiration under glucose addition was more affected by temperature. In conclusion, long-term enclosure reduced soil C mineralization rates, temperature sensitivity and priming effect in Inner Mongolian grasslands, which indicated that these long-term fenced grasslands have the capacity to further sequester CO₂ from the atmosphere.

Key words: carbon sequestration, enclosure, grassland, land-use type, priming effect, Q₁₀, temperature sensitivity

代景忠, 卫智军, 何念鹏, 王若梦, 温学华, 张云海, 赵小宁, 于贵瑞. 封育对羊草草地土壤碳矿化激发效应和温度敏感性的影响. 植物生态学报, 2012, 36(12): 1226-1236. DOI: 10.3724/SP.J.1258.2012.01226

DAI Jing-Zhong, WEI Zhi-Jun, HE Nian-Peng, WANG Ruo-Meng, WEN Xue-Hua, ZHANG Yun-Hai, ZHAO Xiao-Ning, YU Gui-Rui. Effect of grazing enclosure on the priming effect and temperature sensitivity of soil C mineralization in Leymus chinensis grasslands, Inner Mongolia, China. Chinese Journal of Plant Ecology, 2012, 36(12): 1226-1236. DOI: 10.3724/SP.J.1258.2012.01226

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2012.01226

https://www.plant-ecology.com/CN/Y2012/V36/I12/1226

图/表 8

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	地上生物量 Aboveground biomass (g·m^-2)	地表凋落物 Aboveground litter (g·m^-2)	土壤有机碳 Soil organic carbon (g·kg^-1)	土壤全氮 Soil total nitrogen (g·kg^-1)	土壤全磷 Soil total phosphorus (g·kg^-1)	土壤pH Soil pH
自由放牧草地 (FG0) Grazing-free grassland	60.3 ± 20.6^a	30.5 ± 13.8^a	13.4 ± 0.5^a	1.4 ± 0.1^a	0.22 ± 0.02^a	8.2 ± 0.3^a
封育11年草地 (FG11) 11-year fenced grassland	171.6 ± 9.6^b	82.8 ± 18.3^b	18.2 ± 0.5^b	1.7 ± 0.1^a	0.30 ± 0.01^b	7.7 ± 0.2^b
封育31年草地 (FG31) 31-year fenced grassland	148.3 ± 41.3^b	121.1 ± 32.7^c	18.8 ± 2.2^b	1.4 ± 0.7^a	0.28 ± 0.01^b	7.2 ± 0.3^c
F	23.39	19.46	20.31	0.89	69.64	17.14
p	<0.001	<0.001	<0.001	0.437	<0.001	<0.001

	地上生物量 Aboveground biomass (g·m^-2)	地表凋落物 Aboveground litter (g·m^-2)	土壤有机碳 Soil organic carbon (g·kg^-1)	土壤全氮 Soil total nitrogen (g·kg^-1)	土壤全磷 Soil total phosphorus (g·kg^-1)	土壤pH Soil pH
自由放牧草地 (FG0) Grazing-free grassland	60.3 ± 20.6^a	30.5 ± 13.8^a	13.4 ± 0.5^a	1.4 ± 0.1^a	0.22 ± 0.02^a	8.2 ± 0.3^a
封育11年草地 (FG11) 11-year fenced grassland	171.6 ± 9.6^b	82.8 ± 18.3^b	18.2 ± 0.5^b	1.7 ± 0.1^a	0.30 ± 0.01^b	7.7 ± 0.2^b
封育31年草地 (FG31) 31-year fenced grassland	148.3 ± 41.3^b	121.1 ± 32.7^c	18.8 ± 2.2^b	1.4 ± 0.7^a	0.28 ± 0.01^b	7.2 ± 0.3^c
F	23.39	19.46	20.31	0.89	69.64	17.14
p	<0.001	<0.001	<0.001	0.437	<0.001	<0.001

	df	F	p
封育时间 Enclosure duration (G)	2	1 299.1	<0.000 1
葡萄糖添加 Glucose addition (A)	1	15 682.9	<0.000 1
培养温度 Incubation temperature (T)	5	1 716.5	<0.000 1
培养时间 Incubation time (I)	14	455.4	<0.000 1
G × A	2	618.3	<0.000 1
G × T	10	131.5	<0.000 1
G × I	28	15.9	<0.000 1
A × T	5	960.3	<0.000 1
A × I	14	383.9	<0.000 1
T × I	70	68.1	<0.000 1
G × A × T	10	59.5	<0.000 1
G × A × I	28	11.6	<0.000 1
G × T × I	140	7.3	<0.000 1
A × T × I	70	55.8	<0.000 1
G × A × T × I	140	6.7	<0.000 1

	df	F	p
封育时间 Enclosure duration (G)	2	1 299.1	<0.000 1
葡萄糖添加 Glucose addition (A)	1	15 682.9	<0.000 1
培养温度 Incubation temperature (T)	5	1 716.5	<0.000 1
培养时间 Incubation time (I)	14	455.4	<0.000 1
G × A	2	618.3	<0.000 1
G × T	10	131.5	<0.000 1
G × I	28	15.9	<0.000 1
A × T	5	960.3	<0.000 1
A × I	14	383.9	<0.000 1
T × I	70	68.1	<0.000 1
G × A × T	10	59.5	<0.000 1
G × A × I	28	11.6	<0.000 1
G × T × I	140	7.3	<0.000 1
A × T × I	70	55.8	<0.000 1
G × A × T × I	140	6.7	<0.000 1

处理 Treatment	基质质量指数 Substrate quality index				Q₁₀
	培养前7天 Duration of 7 days incubation		培养前56天 Duration of 56 days incubation		培养前7天 Duration of 7 days incubation		培养前56天 Duration of 56 days incubation
	F	p	F	p	F	p	F	p
封育 Enclosure (G)	22.7	<0.000 1	123.5	<0.000 1	113.6	<0.000 1	86.2	<0.000 1
葡萄糖添加 Glucose addition (A)	378.8	<0.000 1	2 076.1	<0.000 1	828.3	<0.000 1	101.6	<0.000 1
G × A	4.9	0.020 1	108.3	<0.000 1	17.2	0.000 1	9.2	0.001 8

封育对羊草草地土壤碳矿化激发效应和温度敏感性的影响

Effect of grazing enclosure on the priming effect and temperature sensitivity of soil C mineralization in Leymus chinensis grasslands, Inner Mongolia, China

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		Y = C₀ + A × exp (B × T)
		A	B	R²	Q₁₀
培养前7天 Duration of 7 days incubation
自由放牧草地 Grazing-free grassland (FG0)	CK	52.3 ± 0.9^a	0.052 ± 0.006	0.939	1.682 ± 0.031^a
	GLU	133.9 ± 3.5^b	0.104 ± 0.002	0.938	2.838 ± 0.068^b
封育11年的草地 11-year fenced grassland (FG11)	CK	52.7 ± 1.0^a	0.040 ± 0.002	0.950	1.496 ± 0.025^c
	GLU	118.1 ± 13.6^b	0.083 ± 0.004	0.918	2.296 ± 0.086^d
封育31年的草地 31-year fenced grassland (FG31)	CK	61.2 ± 0.8^a	0.039 ± 0.002	0.943	1.480 ± 0.025^c
	GLU	171.9 ± 14.2^c	0.075 ± 0.001	0.933	2.120 ± 0.017^f
培养前56天 Duration of 56 days incubation
自由放牧草地 Grazing-free grassland (FG0)	CK	374.0 ± 54.6^a	0.055 ± 0.008	0.965	1.742 ± 0.046^a
	GLU	1 421.1 ± 58.4^b	0.065 ± 0.001	0.899	1.918 ± 0.022^b
封育11年的草地 11-year fenced grassland (FG11)	CK	345.1 ± 33.3^a	0.016 ± 0.005	0.692	1.540 ± 0.010^b
	GLU	842.7 ± 37.2^c	0.048 ± 0.001	0.819	1.615 ± 0.023^c
封育31年的草地 31-year fenced grassland (FG31)	CK	396.0 ± 6.7^a	0.038 ± 0.002	0.880	1.527 ± 0.062^b
	GLU	1 026.1 ± 13.5^d	0.052 ± 0.003	0.813	1.675 ± 0.058^ac

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