一年生植物功能群对放牧草原生物量和土壤呼吸的影响

发布时间：2018-03-02 17:26

  本文选题：土壤呼吸　切入点：一年生植物功能群　出处：《草业科学》2016年12期 　论文类型：期刊论文

【摘要】：作为草原群落重要层片的一年生植物功能群,在湿润季节和年份高度发育补偿群落生物量、维持放牧草原生态系统稳定,但尚不清楚一年生植物功能群通过这一补偿方式如何补偿群落地上/地下生物量和影响土壤呼吸。基于2012年和2013年内蒙古锡林郭勒大针茅(Stipagrandis)+羊草(Leymus chinensis)典型草原两个放牧强度试验样地群落地上/地下生物量、土壤呼吸及相关环境因子的测定。研究表明,1)一年生植物功能群对群落生产力的补偿作用及生长季土壤呼吸累积量在湿润年份(2012年)均大于干旱年份(2013年);且在中度放牧处理中均显著大于轻度放牧处理(P0.05);2)土壤呼吸与一年生植物功能群地上、地下生物量、土壤5cm温度和土壤0-10cm含水率均具有极显著正相关关系(P0.001)。由此表明,当放牧降低了草原群落多年生功能群生物量时,一年生植物功能群在湿润季节和年份可补偿群落生产力、促进土壤呼吸排放速率,进而影响草原生态系统碳循环过程。
[Abstract]:As an important layer of grassland community, annual plant functional group developed highly in wet season and year to compensate the biomass of the community and maintain the stability of grazing grassland ecosystem. However, it is not clear how the annual plant functional group can compensate the aboveground / underground biomass of the community and affect soil respiration through this compensation. Based on the two typical steppes, Leymus chinensis, Stipagrandises, Xilingol, Inner Mongolia, 2012 and 2013. The aboveground / below-ground biomass of the community in three grazing intensity test plots, Determination of soil respiration and related environmental factors. The results showed that the compensatory effect of annual plant functional group on community productivity and the accumulation of soil respiration in wet year (2012) were higher than that in dry year (2013), and the accumulation of soil respiration in wet year (2012) was higher than that in dry year (2013). Soil respiration and annual plant functional group were significantly higher in moderate grazing than in light grazing. The underground biomass, soil temperature (5cm) and soil moisture content (0-10cm) were significantly positively correlated with P0.0010.The results showed that, when grazing decreased the biomass of perennial functional group of grassland community, The annual plant function group can compensate the community productivity in wet season and year, promote soil respiration emission rate, and then affect the process of carbon cycle in grassland ecosystem.
【作者单位】： 内蒙古大学生命科学学院;内蒙古自治区气象科学研究所;内蒙古自治区锡林浩特国家气候观象台;内蒙古民族大学农学院;
【基金】：国家自然科学基金项目“内蒙古退化草原碳库特征及其形成机理的整合研究”(31160476) 中国气象局气候变化专项项目“气候变化对锡林郭勒典型草原畜牧业的影响及适应技术研究”(CCSF201522)
【分类号】：S812
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