| 赵明亮,李艳红,李发东.艾比湖湿地典型植物群落入冬期土壤呼吸日变化特征[J].农业环境科学学报,2015,34(12):2432-2438. |
| 艾比湖湿地典型植物群落入冬期土壤呼吸日变化特征 |
| Diurnal Variation of Soil Respiration in a Typical Plant Community in the Ebinur Lake Wetland During Beginning Winter |
| 投稿时间：2015-05-10 |
| DOI：10.11654/jaes.2015.12.025 |
| 中文关键词: 土壤呼吸 湿地 艾比湖 土壤温度 土壤含水量 入冬期 |
| 英文关键词: soil respiration wetland Ebinur Lake soil temperature soil water content beginning of winter |
| 基金项目:新疆维吾尔自治区重点实验室开放课题(2015KL015);国家自然科学基金项目(41561104);新疆师范大学地理学博士点支撑学科(XJNU-DL-201506) |
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| 中文摘要: |
| 为研究艾比湖湿地典型植物群落下土壤呼吸变化的规律,采用LI-840A土壤碳通量自动测定仪监测了入冬期芦苇(Phragmites australis)和柽柳(Tamarix ramosissima)植物群落下的土壤呼吸过程,结果表明:(1)典型植物群落柽柳和芦苇土壤呼吸速率在入冬期日变化呈现不对称单峰曲线,最大值分别出现在11:00和13:00,最小值都出现在凌晨6:00;(2)全天土壤呼吸平均速率芦苇(0.162 μmol·m-2·s-1)小于柽柳(0.364 μmol·m-2·s-1),但在13:00-17:00时段,芦苇土壤呼吸速率高于柽柳,其余时段相反;芦苇土壤呼吸速率在22:00-10:00左右,柽柳在凌晨4:00-9:00左右均出现负值,表现为碳汇现象,其中芦苇碳吸收高于柽柳;(3)芦苇和柽柳土壤呼吸速率与5 cm处土壤温度存在显着的线性关系,Q10值分别为2.69和2.04,显示出入冬期艾比湖芦苇植物群落土壤呼吸对土壤温度变化的响应更显着;两种植物群落的土壤呼吸与5 cm处土壤水分关系不显着;芦苇和柽柳土壤呼吸速率与近地表气温存在显着的线性关系,Q10值分别为1.89和1.64. |
| 英文摘要: |
| Soil respiration from the surrounding wetland of a lake is a vital component of soil carbon cycle for inland water ecosystems. To date, however, there have been fewer studies on the soil respiration around high salt lakes during beginning of cold winter because of difficulties in field observations. In this study, two intensive field measurements were conducted at a wetland by the Ebinur Lake(82°36'~82°50'E, 44°30'~45°09'N), located at the Xinjiang Uygur Autonomous Region in the Western China, in the early winter of 2014. A soil carbon flux automatic analyzer(LI-840A) was used to measure soil respiration in two typical plant communities, reed(Phragmites australis) and tamarisk(Tamarix ramosissima), in an interval of 2 hours for two whole days. At the same time, soil moisture, soil temperature, air humidity, and air temperature were also observed to understand the controlling factors of soil respiration of local ecosystem. Results showed that the peak of soil respiration occurred at 11:00 and 13:00 for tamarisk and reed, respectively, but the minimum value observed at 6:00 for both plants. The daily average of soil respiration rate was lower for the reed community(0.162 μmol·m-2·s-1) than for the tamarisk community(0.364 μmol·m-2·s-1). However, the soil respiration rate for the reed was greater than that for the tamarisk between 13:00-17:00. Negative soil respiration rates were observed for reed between 22:00-10:00 and for tamarisk between 4:00-9:00, implying carbon sinks during these specific periods. Soil respiration rate was significantly linearly correlated with soil temperature at 5 cm depth and air temperature at 5 cm above ground for both reed and tamarisk. The Q10 values for soil and air temperature were 2.69 and 1.89 for reed and 2.04 and 1.64 for tamarisk, respectively, suggesting that the soil respiration for the reed community had a stronger response to soil temperature change than that for the tamarisk community by the Ebinur Lake in the early winter. Soil respiration rate had no linear correlation with soil water content at 5 cm for reed and tamarisk. |
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