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青海省植被净初级生产力的模拟研究

DOI: 10.3969/j.issn.1001-7410.2011.01.22, PP. 180-188

Keywords: 净初级生产力,遥感,光能利用率模型,时空变化,青海省

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Abstract:

遥感技术根据植被光谱特征可以有效地估算植被的净初级生产力(NPP)。利用遥感数据估算植被NPP,是近10年来NPP的模型研究和估算方法最为突出的特点。文章借鉴了CASA,GLO-PEM,VPM等光能利用率NPP模型的优点,同时充分考虑了研究区域其植被光能利用率和环境因素的典型特点,建立了针对研究区域基于光能利用率原理的植被净初级生产力遥感估算模型。在此基础上,模拟了青海省2006年逐月植被NPP,较深入地分析了NPP的空间分布和季相变化特征。研究结果表明,2006年青海省植被净初级生产力介于0~422gC/m2/a之间,平均值为151gC/m2/a;青海省NPP空间分布规律总体上呈由西北向东南地区递增的趋势;NPP在不同植被类型中的差异相当明显,单位面积平均NPP最高的为阔叶林(314gC/m2/a),最低的为稀疏灌丛(101gC/m2/a);青海省NPP随季节的推移变化显著,NPP的积累期主要发生在水热搭配较好的4~9月份,7月植被平均NPP达到最大值(43gC/m2)。

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