文献类型：期刊文献

中文题名：土壤碳矿化潜力对沙坡头人工固沙植被演变的响应

英文题名：Responses of soil carbon mineralization potential to the succession of artificially sand-binding vegetation in Shapotou region of Tengger desert, North China

作者：周玉燕[1,2] 贾晓红[2,3] 张烜铭[1] 马进琴[1] 陈凤鸣[1] 高艳红[2]

第一作者：周玉燕

机构：[1]甘肃省生产力促进中心;[2]中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站;[3]中国林业科学研究院荒漠化研究所

年份：2013

卷号：32

期号：6

起止页码：1371-1377

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：国家自然科学基金项目(41171077;40801002和40971031)资助

语种：中文

中文关键词：人工固沙区;土壤理化性质;土壤碳矿化潜力

外文关键词：artificially fixed sand area; soil physical and chemical properties; soil carbon mineralization potential

分类号：Q14

摘要：土壤呼吸是土壤有机C矿化分解,释放无机养分的重要生物化学过程。本研究通过实验室培养的方法,分析了沙坡头地区人工固沙区不同固沙年限土壤碳矿化潜力的变化。经过103d的室内培养,土壤CO2-C的释放量表现为55龄>47龄>30龄>24龄>21龄>流动沙丘,在垂直方向上表现为0～5cm>5～10cm>10～20cm。而流沙区土壤碳矿化潜力为10～20cm土层最高。不同固沙年限土壤碳矿化潜力、全氮、有机碳、电导率有明显的差异,均表现为随植被恢复年限的延长而增加,随深度的增加而递减。相关性分析表明,土壤碳矿化潜力与土壤有机碳、总氮、C/N、pH、电导率、温度、土壤水分含量呈极显著相关,土壤各环境因子之间亦呈极显著相关。土壤养分含量随着恢复时间的延长而得到明显的改善,土壤碳矿化潜力与土壤养分状况改善程度一致。人工固沙植被的建立促进了土壤微生物活性,通过潜在的土壤呼吸得到表征。植被恢复和凋落物积累使土壤免遭风蚀,显著增加了土壤有机质的输入,因而显著作用于大气C的固存。
Soil respiration is one of the important biochemical processes related to the mineraliza- tion and decomposition of soil organic matter （SOM） and the release of inorganic nutrients. In this study, an incubation experiment was conducted to study the mineralization potential of SOM in the re-vegetation area with an age sequence in Shapotou region of Ningxia. After 103 days of incubation, the released soil C02-C was in the age sequence of 55 years 〉 47 years 〉 30 years 〉 24 years 〉 21 years 〉 mobile dune. Meanwhile, the released CO2-C decreased along the soil profile 0-5 cm, 5-10 cm, and 10-20 cm in re-vegetation area, but increased along the soil pro- file in moving sand dune. There existed significant differences （P〈0.05） in the soil carbon min- eralization potential, total nitrogen, organic carbon, and electrical conductivity among the age se- quence. All the variables increased with age sequence but decreased with soil depth. Correlation analysis showed that the soil carbon mineralization potential was significantly correlated to the soil organic carbon, total nitrogen, C/N ratio, soil temperature, soil water, pH, and electrical con- ductivity （P〈0.01）, and all the soil variables were significantly correlated each other （P〈 0.01 ）. The soil nutrient contents increased obviously with age sequence, and the improvement of soil nutrient status was in accordance with tial. It was suggested that the establishment the enhancement of soil carbon mineralization poten- of artificial vegetation promoted the activities of soil microbes, which was implied by the soil respiration, whereas the vegetation recovery and litter accumulation mitigated soil wind erosion, increased SOM input, and contributed to C sequestration.