干旱沙区典型人工植被群落下土壤剖面CO2浓度变化特征及其驱动因子

doi:10.7522/j.issn.1000-694X.2013.00290

摘要/Abstract

摘要： 对人工固沙植被区柠条（Caragana korshinskii）群落和油蒿（Caragana korshinskii）群落下不同深度的土壤气体采样，主要研究和讨论了不同类型人工植被区下土壤CO₂浓度的变化特征及土壤温度和土壤水分对其的影响。结果表明：柠条和油蒿群落0~80 cm处的土壤空气CO₂浓度随着土壤深度的增加而增加，并且在0~40 cm，油蒿群落下的土壤CO₂浓度值大于柠条，而在40 cm以下则相反。其平均值分别为1 229.3 μmol·mol^-1和1 242.7 μmol·mol^-1，大于同一深度流沙下土壤CO₂浓度值978.9 μmol·mol^-1。土壤水分与二者的土壤CO₂浓度变化趋势在年际尺度上具有一致性，浅层40 cm内油蒿群落下的土壤CO₂浓度和土壤水分含量的相关性明显大于柠条和流沙。而在40 cm以下，则表现为柠条>油蒿>流沙。土壤温度对土壤CO₂浓度的影响程度一般为流沙>油蒿>柠条，特别是流沙，在表层达到了极显著的水平，之后随着土壤深度的增加而降低。而土壤温度对油蒿和柠条样地土壤CO₂浓度的影响较为复杂，呈现出先增加后减小的趋势。在年际尺度上，土壤水分含量是不同植被群落下土壤剖面CO₂浓度的关键限制因子，而在日尺度上，土壤温度则为主要限制因子。据粗略估计，在0~80 cm内，柠条和油蒿根系呼吸所占的比例约为30.7%和33.3%。

关键词: 干旱沙区, 人工植被群落, 土壤CO₂浓度, 驱动因子

Abstract: Soil gas sample at different depths under different plant communities in the sand-fixing vegetation zones were obtained, and then the CO₂ concentration in certain soil profiles and the impact of soil temperature and soil moisture on CO₂ concentration were analyzed. The results showed that, Soil CO₂ concentration under the Caragana korshinskii and Artemisia ordosica communities in the 0-80 cm soil layer increased with depth, the average value was 1 229.3 μmol·mol^-1 and 1 242.7 μmol mol^-1, respectively, which was larger than that in the same depth of mobile sand dunes (978.9 μmol·mol^-1). The soil CO₂concentration under Artemisia ordosica community was more than the Caragana korshinskii community at 0-40 cm, but the direction was the opposite below 40 cm. Soil moisture and the soil CO₂ concentration under different plant communities had consistency in the interannual timescale, soil CO₂ concentration under the Artemisia ordosica plant community and the soil moisture content had the more significant relationship than the Caragana korshinskii community and sand at 0-40 cm soil depth, but under 40 cm, the order was Caragana korshinskii>Artemisia ordosica>sand. The influence of soil temperature to soil CO₂ concentration was generally sand>Artemisia ordosica>Caragana korshinskii, especially in the surface layer, there was a significant correlation under the sand soil profile, and then decreased with soil depth. Soil temperature on soil CO₂ concentration under the Caragana korshinskii and Artemisia ordosica communities was more complex, correlation analysis had showed that the correlation was smaller at 0-10 cm, and then rose at 10-40cm, but began to decrease in the 40-80 cm. In annual time scales, the soil moisture content was the key limiting factor of soil profile CO₂ concentrations under different vegetation types, but in the daily time scale, the soil temperature was the main limiting factor. Furthermore, the root respiratory proportion of Caragana korshinskii and Artemisia ordosica communities was approximately 30.7% and 33.3%, respectively, at 0-80 cm from our study.

Key words: arid desert, sand-fixing vegetation zones, soil CO₂ concentration, driving factors

中图分类号:

S152.6

黄磊, 张志山, 胡宜刚, 杨昊天. 干旱沙区典型人工植被群落下土壤剖面CO₂浓度变化特征及其驱动因子[J]. 中国沙漠, 2014, 34(1): 125-132.

Huang Lei, Zhang Zhishan, Hu Yigang, Yang Haotian. Soil CO₂ Concentration under Different Types of Plant Communities and the Driving Factors in Arid Desert Area[J]. JOURNAL OF DESERT RESEARCH, 2014, 34(1): 125-132.

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干旱沙区典型人工植被群落下土壤剖面CO₂浓度变化特征及其驱动因子

Soil CO₂ Concentration under Different Types of Plant Communities and the Driving Factors in Arid Desert Area

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