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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。
Six typical land cover types (100-year irrigated farmland, newly irrigated irrigated farmland, artificial poplar forest, artificial Pinus sylvestris var. Mongolica plantation, artificial Haloxylon ammodendron forest and natural desert grassland) were studied in the middle reaches of the Heihe River. Soil respiration, Water and soil temperature responses were measured. The results showed that the soil respiration rate of irrigated farmland was significantly higher than that of artificial Pinus sylvestris var. Mongolica and poplar woodland, and the plantation land was significantly larger than that of desert grassland and Haloxylon ammodendron shrubland. There was a significant positive correlation between soil respiration rate and soil temperature in six land cover types, and the Q10 value was 1.14-1.31, indicating that the sensitivity of soil respiration rate to soil temperature was lower than the world average level. The soil respiration rate and soil water content were significant The exponential relationship. This indicates that there are significant differences in soil respiration characteristics among the six land cover types and that the soil respiration characteristics of different land cover types are closely related to hydrothermal factors. The change of land cover dominated by human activities has a profound impact on the desert oasis ecosystem Water and soil health interactions.