黄土高原不同生长年限植被减水减沙效益整合分析

Meta-analysis on Runoff and Sediment Reductions of Re-vegetation with Different Planting Years on Loess Plateau

[目的]研究不同恢复年限植被减水减沙效益变化特征,为黄土高原地区进一步合理配置林草措施和生态恢复的可持续性研究提供科学依据。[方法]通过文献检索,共收集到18篇相关文献,运用整合分析的方法定量地研究了恢复年限增加对植被减水减沙效益的影响。[结果]4年生以上草地植被和5年生以上林灌植被可以发挥稳定的减水减沙效益,且减沙效益基本保持在80%左右。林地枯落物对植被的减水减沙效益具有一定的促进作用。[结论]受不同恢复阶段限制因素的影响,林草植被减水减沙效益大致可以分为3个阶段:栽植扰动阶段、水土保持阶段、水分限制阶段。

[Objective]To analyze the variation of runoff and sediment reductions of re-vegetation with different planting years in order to provide a scientific basis for allocating measures of grassland rationally further and studying the sustainability of ecological restoration on the Loess Plateau region.[Methods]A meta-analysis was conducted to quantitatively describe the effects of re-vegetation on runoff and sediment reductions by compiling eighteen papers.[Results]The vegetation of grassland planted for more than four years and woods and shrubs planted for more than five years had a stable benefit on runoff and sediment reduction with the increase of age,and the benefit remain at about 80%.Litters on the surface in the forest play an important role in promoting more runoff and sediment reductions.[Conclusion]In regard to the effects of water and sediment reduction of vegetation which were affected by many limiting factors,it can be divided into three stages as following：plant disturbance stage,soil and water conservation and moisture limited stage.