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草业学报  2015 

基于构件特征的内蒙古典型草原植物羊草个体地上生物量估算

DOI: 10.11686/cyxb2015053, PP. 211-217

Keywords: 羊草,构件特征,个体地上生物量,典型草原

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Abstract:

生物量是评价草原生态系统生产力的重要指标,草原主要植物个体地上生物量估算模型的建立,可为采用非刈割方法获取较准确的草原地面数据资料提供新方法。通过分析内蒙古典型草原植物羊草的主要构件特征(叶片数、叶长宽积、茎粗、茎高和株高)与其个体地上生物量之间的关系,比较并筛选出能较好预测羊草个体生物量变化的构件指标,采用Minitab软件的回归分析方法,分别利用6月、7月和8月采集的90株和总体270株羊草植物样本,建立羊草不同生长阶段(生长初期、生长旺盛期和生长末期)以及总体样本的个体地上生物量估算方程,并对实测值与模拟值进行t检验分析。结果表明,叶长宽积和株高相对于其他构件信息能够更好地描述羊草个体地上生物量,方程Y=-0.193+0.009X2+0.011X5(X2为叶长宽积,X5为株高,P<0.01,R2=0.854)为最优羊草个体生物量估算模型。

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