中国地理科学 ›› 2016, Vol. 26 ›› Issue (2): 270-282.doi: 10.1007/s11769-016-0804-3

• 论文 • 上一篇    

Effects of Drought on Net Primary Productivity: Roles of Temperature, Drought Intensity, and Duration

SUN Binfeng1, ZHAO Hong1, WANG Xiaoke2,3   

  1. 1. Jinan Environmental Research Institute, Jinan 250100, China;
    2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    3. Joint Center for Global Change Studies (JCGCS), Beijing 100875, China
  • 收稿日期:2015-07-08 修回日期:2015-10-16 出版日期:2016-02-27 发布日期:2016-02-25
  • 通讯作者: WANG Xiaoke E-mail:wangxk@rcees.ac.cn
  • 基金资助:

    Under the auspices of Special Issue of National Remote Sensing Survey and Assessment of Eco-Environment Change Between 2000 and 2010 (No. STSN-09-03)

Effects of Drought on Net Primary Productivity: Roles of Temperature, Drought Intensity, and Duration

SUN Binfeng1, ZHAO Hong1, WANG Xiaoke2,3   

  1. 1. Jinan Environmental Research Institute, Jinan 250100, China;
    2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    3. Joint Center for Global Change Studies (JCGCS), Beijing 100875, China
  • Received:2015-07-08 Revised:2015-10-16 Online:2016-02-27 Published:2016-02-25
  • Contact: WANG Xiaoke E-mail:wangxk@rcees.ac.cn
  • Supported by:

    Under the auspices of Special Issue of National Remote Sensing Survey and Assessment of Eco-Environment Change Between 2000 and 2010 (No. STSN-09-03)

摘要:

Northeast China has experienced frequent droughts over the past fifteen years. However, the effects of droughts on net primary productivity (NPP) in Northeast China remain unclear. In this paper, the droughts that occurred in Northeast China between 1999 and 2013 were identified using the Standardized Precipitation Evapotranspiration Index (SPEI). The NPP standardized anomaly index (NPP-SAI) was used to evaluate NPP anomalies. The years of 1999, 2000, 2001, and 2007 were further investigated in order to explore the influence of droughts on NPP at different time scales (3, 6, and 12 months). Based on the NPP-SAI of normal areas, we found droughts overall decreased NPP by 112.06 Tg C between 1999 and 2013. Lower temperatures at the beginning of the growing season could cause declines in NPP by shortening the length of the growing season. Mild drought or short-term drought with higher temperatures might increase NPP, and weak intensity droughts intensified the lag effects of droughts on NPP.

关键词: drought, net primary productivity (NPP), Standardized Precipitation Evapotranspiration Index (SPEI), NPP Standardized anomaly index (NPP-SAI)

Abstract:

Northeast China has experienced frequent droughts over the past fifteen years. However, the effects of droughts on net primary productivity (NPP) in Northeast China remain unclear. In this paper, the droughts that occurred in Northeast China between 1999 and 2013 were identified using the Standardized Precipitation Evapotranspiration Index (SPEI). The NPP standardized anomaly index (NPP-SAI) was used to evaluate NPP anomalies. The years of 1999, 2000, 2001, and 2007 were further investigated in order to explore the influence of droughts on NPP at different time scales (3, 6, and 12 months). Based on the NPP-SAI of normal areas, we found droughts overall decreased NPP by 112.06 Tg C between 1999 and 2013. Lower temperatures at the beginning of the growing season could cause declines in NPP by shortening the length of the growing season. Mild drought or short-term drought with higher temperatures might increase NPP, and weak intensity droughts intensified the lag effects of droughts on NPP.

Key words: drought, net primary productivity (NPP), Standardized Precipitation Evapotranspiration Index (SPEI), NPP Standardized anomaly index (NPP-SAI)