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降水波动对呼伦贝尔草甸草原初级生产力年际动态影响

吕世海 刘及东 郑志荣 叶生星 常学礼

吕世海, 刘及东, 郑志荣, 叶生星, 常学礼. 降水波动对呼伦贝尔草甸草原初级生产力年际动态影响[J]. 环境科学研究, 2015, 28(4): 550-558.
引用本文: 吕世海, 刘及东, 郑志荣, 叶生星, 常学礼. 降水波动对呼伦贝尔草甸草原初级生产力年际动态影响[J]. 环境科学研究, 2015, 28(4): 550-558.
L Shihai, LIU Jidong, ZHENG Zhirong, YE Shengxing, CHANG Xueli. Effects of the Annual Precipitation Fluctuation on Primary Productivity in Hulunbeier Meadow-Steppe[J]. Research of Environmental Sciences, 2015, 28(4): 550-558.
Citation: L Shihai, LIU Jidong, ZHENG Zhirong, YE Shengxing, CHANG Xueli. Effects of the Annual Precipitation Fluctuation on Primary Productivity in Hulunbeier Meadow-Steppe[J]. Research of Environmental Sciences, 2015, 28(4): 550-558.

降水波动对呼伦贝尔草甸草原初级生产力年际动态影响

基金项目: 国家环境保护公益性行业科研专项(201109025);国家自然科学基金项目(41271193)

Effects of the Annual Precipitation Fluctuation on Primary Productivity in Hulunbeier Meadow-Steppe

  • 摘要: 降水是控制草原植被生产力最关键的因素. 为探明降水量在不同时间尺度上的波动及其对草原植被的响应机制,以呼伦贝尔草甸草原为研究对象,选用反映年际降水量波动的降水集中度和偏离期2个因子,将以地面光谱生物量模型计算获得的草甸草原植被NPP(net primary production,净初级生产力)与不同周期降水量和降水波动因子建立回归模型,分析年际降水量波动对草甸草原植被NPP的影响. 结果表明:①在呼伦贝尔草甸草原区,以年内4—7月为关键期,Pk(关键期累积降水量)对草甸草原植被NPP的影响最大,Cdk(关键期降水集中度)平均值为0.439±0.182,dk(关键期降水偏离期)平均值为31.6 d,变幅为-3.6~94.2 d. ②以Pk和以旬为单位的Cdk、dk构建的草甸草原植被NPP估算模型,y=-52.11+88.957Cdk+0.724dk+0.953Pk,能较好地反映草甸草原植被NPP与降水波动之间的关系,模型估测精度可达91.0%. 因此,在半干旱草原区,利用基于遥感植被反射光谱构建的NPP模型计算草甸草原植被NPP具有较高的可信度,并且与样方调查结果有极高的关联性.

     

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  • 刊出日期:  2015-04-25

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