黑河中游不同土地覆被类型土壤呼吸及对水热因子的响应

发布时间：2018-05-16 12:17

  本文选题：黑河中游 + 土地覆被　； 参考：《中国沙漠》2017年05期

【摘要】：以黑河中游6种典型土地覆被类型(百年灌溉农田、新垦灌溉农田、人工杨树林、人工樟子松林、人工梭梭灌木林和天然荒漠草地)为研究对象,对土壤呼吸及其对土壤含水量和土壤温度的响应进行测定。结果表明:灌溉农田的土壤呼吸速率显著大于人工樟子松林地和杨树林地,人工林地显著大于荒漠草地和梭梭灌木林地。6种土地覆被类型土壤呼吸速率与土壤温度显著正相关性,Q10值1.14~1.31,表明该地区土壤呼吸速率对土壤温度的敏感性低于世界平均水平;土壤呼吸速率与土壤含水量呈显著的指数关系。这表明6种土地覆被类型的土壤呼吸特征存在显著差异,且不同土地覆被类型的土壤呼吸特征与水热因子关系密切,以人类活动为主导的土地覆被变化深刻影响着荒漠绿洲生态系统水土气生的相互作用。
[Abstract]:Six typical land cover types (100 years irrigated farmland, newly cultivated irrigated farmland, artificial poplar forest, artificial Pinus sylvestris forest, artificial Haloxylon ammodendron shrub and natural desert grassland) in the middle reaches of Heihe River were studied. Soil respiration and its response to soil water content and soil temperature were measured. The results showed that the soil respiration rate of irrigated farmland was significantly higher than that of artificial Pinus sylvestris forest and poplar forest land. There was a significant positive correlation between soil respiration rate and soil temperature in artificial forest land than in desert grassland and Haloxylon ammodendron shrub, indicating that the sensitivity of soil respiration rate to soil temperature was lower than that of the world average. There was a significant exponential relationship between soil respiration rate and soil moisture content. This indicated that there were significant differences in soil respiration characteristics among six land cover types, and the soil respiration characteristics of different land cover types were closely related to water and heat factors. Land cover change, which is dominated by human activities, has a profound impact on the interaction between soil and water and gas generation in the desert and oasis ecosystem.
【作者单位】： 甘肃省科学技术情报研究所;中国科学院寒区旱区环境与工程研究所;兰州石化职业技术学院;
【基金】：国家自然科学基金项目(71363003,41201248,41471210) 中国科学院西部之光博士项目(Y529881001)
【分类号】：S154
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本文编号：1896776