内蒙古典型草原主要物种-土壤互反馈初探

发布时间：2018-03-14 20:13

本文选题：典型草原　切入点：放牧强度　出处：《草地学报》2016年06期 　论文类型：期刊论文

【摘要】：过度放牧不仅导致草地生产力下降,还会引起植物群落结构的改变,这可能与土壤理化性状和土壤生物组成的变化有关。探索土壤和植物的互反馈现象,对理解草原生态系统的稳定性具有重要意义。本研究选择内蒙古锡林郭勒草原相邻地块中度和过度放牧样地的2种土壤,在灭菌和不灭菌条件下,分别种植中度放牧样地优势物种大针茅(Stipagrandis)和过度放牧样地优势物种冷蒿(Artemisia frigida)2块样地共有物种冰草(Agropyron cristatum)和隐子草(Cleistogenes squarrosa),测定了植物生物量和水分利用效率。结果表明,中度放牧样地优势物种大针茅表现出显著的负反馈作用,而过度放牧样地优势物种冷蒿,则表现出显著的正反馈作用。与不灭菌处理相比,灭菌后,4个物种地上部生物量与水分利用效率都有增加趋势,其中冰草和隐子草生物量和水分利用效率增加显著。
[Abstract]:Overgrazing not only leads to the decrease of grassland productivity, but also to the change of plant community structure, which may be related to the changes of soil physical and chemical properties and soil biological composition. It is of great significance to understand the stability of grassland ecosystem. In this study, two kinds of soils were selected from the adjacent plots of Xilinguole grassland, Inner Mongolia, under the condition of sterilizing and non-sterilizing. The dominant species Stipagrandisis) and the dominant species Artemisia frigida)2 (Artemisia frigida)2) and Cleistogenes squarrosaa were planted in moderate grazing plots and overgrazing plots, respectively. The results showed that the plant biomass and water use efficiency (Wue) of Artemisia frigida)2 were determined. Stipa grandis, the dominant species in moderate grazing plots, showed significant negative feedback, while Artemisia annua, the dominant species in overgrazing land, showed significant positive feedback. After sterilization, the aboveground biomass and water use efficiency (Wue) of the four species increased, and the biomass and water use efficiency (Wue) of the two species increased significantly.
【作者单位】：中国农业大学资源与环境学院;
【基金】：国家自然科学基金项目(41071207)资助
【分类号】：S812

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