锡林河流域草原生物量对环境因子的响应

发布时间：2018-05-12 22:13

  本文选题：生物量 + 环境因子　； 参考：《生态环境学报》2017年06期

【摘要】：锡林河流域是内蒙古典型草原最具代表性的区域,了解植被群落生物量特征及其与环境因子的关系,对于合理利用草地资源,科学制定合理的放牧政策具有重要的指导意义。以锡林河流域草原为研究对象,基于样方调查和实验数据,运用相关分析、通径分析、决策系数分析研究了环境因子对地上生物量、地下生物量以及根冠比的直接与间接影响。结果表明,(1)流域地上生物量、地下生物量、根冠比均值分别为117.60 g?m~(-2)、1 548.69 g?m~(-2)、14.55;变异系数均在50%左右,属于中等变异程度。(2)影响草地地上生物量、地下生物量以及根冠比的环境因子不尽相同,相关分析表明,地上生物量与海拔、生长季降水、生长季平均气温具有显著相关关系(P0.05);地下生物量与海拔、生长季降水、生长季平均气温、年均温、0℃积温、有机碳含量、全氮含量、饱和含水率、田间持水率、干容重呈显著相关关系(P0.05);根冠比与土壤有机碳与全氮含量、0~10 cm层土壤饱和含水率和田间持水率均达到显著相关水平(P0.05)。(3)海拔和4—7月降水对地上生物量具有间接影响,而4—7月平均气温则对其具有直接影响,4—7月平均气温为主要决策变量。(4)4—7月降水量、年平均气温、土壤有机碳含量对地下生物量主要产生直接影响,是控制地下生物量的主要环境因子。
[Abstract]:Xilin River Basin is the most representative region of typical grassland in Inner Mongolia. Understanding the biomass characteristics of vegetation community and its relationship with environmental factors has important guiding significance for rational utilization of grassland resources and scientific formulation of rational grazing policies. The direct and indirect effects of environmental factors on aboveground biomass, underground biomass and root-shoot ratio were studied by correlation analysis, path analysis and decision coefficient analysis based on sample investigation and experimental data. The results showed that the mean values of aboveground biomass, belowground biomass and root-shoot ratio were 117.60 g / m ~ (-1) and 1 548.69 g / m ~ (-1) ~ (2) respectively, and the coefficients of variation were about 50%, belonging to a moderate degree of variation, which affected the aboveground biomass of grassland. The environmental factors of underground biomass and root / shoot ratio are different. Correlation analysis shows that aboveground biomass has a significant correlation with altitude, precipitation in growing season and average temperature in growing season, while underground biomass has significant correlation with altitude and precipitation in growing season. Average temperature of growing season, accumulated temperature of 0 鈩，

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