内蒙古农牧交错区不同土地利用方式下土壤呼吸速率及其温度敏感性变化

doi:10.3724/SP.J.1258.2011.00167

摘要/Abstract

摘要：

2009年8-10月, 采用动态气室法观测了内蒙古农牧交错区多伦县农田、弃耕和围封3种土地利用方式下, 土壤呼吸速率从6:00到18:00的变化规律, 分析了不同深度的土壤温度与土壤含水量对土壤呼吸速率的控制作用。结果表明, 空间尺度上, 不同土地利用方式的土壤呼吸速率由高到低依次为: 农田>弃耕>围封; 时间尺度上, 土壤呼吸速率在6:00-18:00的变化趋势为单峰曲线, 在12:00-15:00达到峰值, 随后降低, 在18:00基本恢复到6:00左右的呼吸水平, 同时, 土壤呼吸速率在9、10月显著降低。利用Van’t Hoff指数模型研究不同深度土壤温度对土壤呼吸速率的影响发现, 10-15 cm深度的土壤温度对土壤呼吸速率的影响最为显著, 其中, 土壤呼吸温度敏感性由高到低分别为: 农田>围封>弃耕。相反, 由于8-10月土壤含水量变化较小, 故土壤含水量与土壤呼吸速率间的相关性不显著, 土壤含水量不能解释该时段土壤呼吸速率的变化。

关键词: Q₁₀, 土壤呼吸速率, 土壤温度, 土壤含水量

Abstract:

Aims Our objectives are to compare soil respiration rate and its temperature sensitivity at different land use types and discuss soil respiration response to soil temperature (T_s) and soil water content at different soil depths.
Methods Periodic measurements of soil respiration rates (R_s) were made during August-October 2009 with a LI-8100 portable automated soil CO₂ flux system in three agro-pastoral ecotone land use types: cropland, abandoned cultivated land and grazing enclosure. Soil temperature and soil water content at 0-5, 5-10 and 10-15 cm depths were measured simultaneous adjacent to the soil collar.
Important findings R_s is significantly different among the three land use types and greatest in cropland. R_s exhibited a unimodal curve during 6:00-18:00, with a maximum during 12:00-15:00. R_s decreased with T_s, so R_s was significantly higher in August than in September and October. With the Van’t Hoff model, we concluded there is a positive, exponential relationship between measured T_s and R_s. In addition, temperature sensitivity of soil respiration (Q₁₀), which is derived from the Van’t Hoff model, was largest in cropland. In contrast, R_s was negatively related to soil water content in different soil depths at the sites.

Key words: Q₁₀, soil respiration rate, soil temperature, soil water content

马骏, 唐海萍. 内蒙古农牧交错区不同土地利用方式下土壤呼吸速率及其温度敏感性变化. 植物生态学报, 2011, 35(2): 167-175. DOI: 10.3724/SP.J.1258.2011.00167

MA Jun, TANG Hai-Ping. Variations of soil respiration rate and its temperature sensitivity among different land use types in the agro-pastoral ecotone of Inner Mongolia. Chinese Journal of Plant Ecology, 2011, 35(2): 167-175. DOI: 10.3724/SP.J.1258.2011.00167

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2011.00167

https://www.plant-ecology.com/CN/Y2011/V35/I2/167

图/表 7

表1 样地描述

Table 1 Description of study sites

重要因子 Important factors	农田样地 Cropland plot	弃耕样地 Abandoned cultivated plot	围封样地 Grazing enclosure plot
地理位置 Geographical position	42°02′19.9″ N 116°16′49.2″ E	42°02′19.9″ N 116°16′53.2″ E	42°02′23.4″ N 116°17′9.4″ E
植被组成 Vegetation composition	小麦 Triticum aestivum 荞麦 Fagopyrum tataricum	冰草 Agropyron cristatum 冷蒿 Artemisia frigida	克氏针茅 Stipa krylovii 冷蒿 Artemisia frigida
土壤容重 Soil bulk density (g·cm^-3)	1.34	1.50	1.46
土壤有机质 Soil organic matter (%)	1.63	2.83	2.31
土地利用历史 Land-use history	1 year	9 years	10 years

图1 农田、弃耕与围封样地土壤呼吸速率的变化(平均值±标准误差)。

Fig. 1 Variations of soil respiration rates in cropland, abandoned cultivated and grazing enclosure plots (mean ± SE).

图2 不同深度的土壤温度(平均值±标准误差)。

Fig. 2 Soil temperatures at different soil depths (mean ± SE).

图3 农田、弃耕与围封样地土壤呼吸速率的比较(平均值±标准误差)。

Fig. 3 Comparisons of soil respiration rates among cropland, abandoned cultivated and grazing enclosure plots (mean ± SE).

图4 不同深度土壤温度与土壤呼吸速率之间的关系。**, 相关性达到极显著水平(p < 0.01)。

Fig. 4 Relationships between soil respiration rate and soil temperature at different soil depths. **, correlation is significant at the 0.01 level.

图5 农田、弃耕、围封样地中不同土壤深度的Q10值(平均值±标准误差)。

Fig. 5 Q10 at different soil depths at cropland, abandoned cultivated and grazing enclosure plots (mean ± SE).

表2 不同深度土壤含水量与土壤呼吸速率的关系

Table 2 Relationships between soil respiration rates and soil water content at different soil depths

	土壤深度 Soil depth (cm)	方程 Equation	R2	p
农田样地 Cropland plot	0-5	y = 0.519 7e^{2.092 5}^x	0.028 9	p > 0.05
	5-10	y = 0.409 6e^{3.495 4}^x	0.095 9	p > 0.05
	10-15	y = 0.446 6e^{3.049 2}^x	0.104 5	p > 0.05
弃耕样地 Abandoned cultivated plot	0-5	y = 1.029 4e^-15.000^x	0.505 8	p > 0.05
	5-10	y = 0.401 0e^{7.800 8}^x	0.051 8	p > 0.05
	10-15	y = 0.198 5e^26.016^x	0.292 6	p > 0.05
围封样地 Grazing enclosure plot	0-5	y = 0.362 6e^{6.371 3}^x	0.065 5	p > 0.05
	5-10	y = 0.376 4e^{6.597 6}^x	0.017 2	p > 0.05
	10-15	y = 0.298 7e^12.059^x	0.143 3	p > 0.05

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