恢复干扰技术对盐碱化草地植被与土壤碳排放的影响

Effect of Restoration Interference Techniques on Vegetation and Soil carbon Discharge of Saline-alkali Grassland

针对松嫩平原盐碱化草地生态退化现状,研究运用不同干扰程度的围栏封育、震动深松、浅翻轻耙、施肥(沼气化废弃物)和人工草地等草地植被恢复技术进行生态恢复,通过监测结果表明各种恢复技术对盐碱化草地植被恢复具有明显促进作用,植被盖度、高度和生产力大幅度提高。同时,人为扰动改善了土壤结构,植被凋落物增加,导致土壤呼吸作用加强,CO2排放通量增加,但由于植被碳固定的增加率远高于土壤CO2排放通量增加率,因此,生态恢复技术的实施增强了盐碱化草地碳"汇"功能,并且随着生态恢复技术中人为干扰强度的增加,这种增加趋势更加明显。

In this paper,aiming at current saline-alkali grassland degeneration situation in Songnen plain,the application of different interference level of grassland vegetation restoration techniques such as fencing,deep loosening,shallow-plowing,fertilizing（biogas chemical waste）and artificial grass in ecological restoration were studied,the monitoring results showed that,various restoration techniques had pronounced promoter actions on saline-alkali grassland vegetation restoration,and greatly improved the coverage,height,and productivity of vegetation.At the same time,human disturbance had improved soil structure,and increased vegetation litter,leading to the enhancement of soil respiration and increase in CO2 discharge flux.However,due to the increment rate of vegetation carbon fixation amount was much higher than the increment rate of soil CO2 discharge flux,the implementation of ecological restoration techniques enhanced carbon ＂sink＂function of saline-alkali grassland,and with the increasing intensity of human disturbance in ecological restoration techniques,this increasing trend was even more evident.