Effect of ecological restoration techniques on vegetation and soil CO2 discharge of Songnen saline-alkali grassland, China

Z. Yan, Yingnan Liu, H. Ni, Z. Zeng, Yuxin Men
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引用次数: 1

Abstract

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, reseeding 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.
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松嫩盐碱草地生态恢复技术对植被和土壤CO2排放的影响
本文针对松嫩平原盐碱草地退化现状,研究了围栏、深松、浅耕、补种、人造草等不同干扰程度的草地植被恢复技术在生态恢复中的应用,监测结果表明,各种恢复技术对盐碱草地植被恢复有明显的促进作用,盖度有较大提高;植被的高度和生产力。同时,人为干扰改善了土壤结构,增加了植被凋落物,导致土壤呼吸增强,CO2排放通量增加。然而,由于植被固碳量的增量速率远高于土壤CO2排放通量的增量速率,生态恢复技术的实施增强了盐碱草地的碳“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。
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