LIU Dan,YU Chenglong.Estimation on Climatic Productivity of Vegetation NPP in Northeastern China Based on MODIS[J].Research of Soil and Water Conservation,2017,24(04):315-323.
基于MODIS的东北三省植被NPP潜在气候生产力估算
- Title:
- Estimation on Climatic Productivity of Vegetation NPP in Northeastern China Based on MODIS
- Keywords:
- NPP; estimation model; climatic productivity; MODIS; Northeastern China
- 分类号:
- Q948
- 摘要:
- 大范围准确的植被生产潜力的估测，可为区域生态建设与保护提供决策支撑。基于MODIS/MCD12Q1数据、MODIS/MOD17A3数据和气象观测数据，在分析2001—2013年东北三省植被单位面积NPP年累积量时空变化的基础上，划分植被类别，构建东北三省植被NPP气候估算模型，并对研究区2013年植被NPP潜在气候生产力进行了估算。结果表明：（1）2001—2013年东北三省植被单位面积NPP年累积平均值（NPP）空间分异明显，变化范围为15～1 000 gC/（m2·a），较高区域在辽宁东南部沿海和长白山东坡，达到800～1 000 gC/（m2·a）；（2）2001—2013年东北三省无显著的年际变化趋势，但其中自然植被NPP的年际波动幅度明显大于人工植被；（3）根据NPP的大小将东北三省植被分成3个类别，在此基础上分析各个植被类别的NPP与温度因子（包括年平均气温、年≥10℃积温、4—10月平均气温和年负积温）、降水因子（包括年降水量和4—10月降水量）、蒸散量因子（包括年蒸散量、4—10月蒸散量）和光照因子（4—10月平均日照时数和4—10月累计日照时数）的相关关系，进而构建NPP气候估测模型，观测值与模拟值结果之间的相关性均达到了极显著水平，RMSE较小，模型的模拟结果比较可靠。（4）2013年东北三省NPP潜在气候生产力值在422～1 100 gC/（m2·a），北部山区的NPP实际值接近于NPP潜在气候生产力值，而南部地区的NPP实际值较NPP潜在气候生产力值相差较大。
- Abstract:
- Net primary productivity (NPP) is a key component of the terrestrial carbon cycle and the accurate estimation on NPP can provide some reference for regional ecological construction and protection. Based on the MODIS data and meteorological data, the spatiotemporal change of annual NPP accumulation per unit area in Northeastern China from 2001 to 2013 was analyzed. Different vegetation cover types were divided and the climatic estimation model of vegetation NPP was constructed. And then we estimated the climatic productivity of vegetation NPP in 2013. The results showed as follows. (1) There were significant differences in average annual NPP accumulation (NPP) per unit area from 2001 to 2013 in Northeastern China. It ranged from 15 gC/(m2·a) to 1 000 gC/(m2·a) and it was especially higher in the coastal area of the southeastern Liaoning Province and on eastern slope of Changbai Mountains, with the value of 800～1 000 gC/(m2·a). (2) The interannual variation of (NPP) had no obvious characteristics. But its variation of natural vegetation was bigger than artificial vegetation. (3) Based on (NPP), the vegetation of Northeastern China was divided into three types and the relationships between NPP of each vegetation type and temperature, precigaipitation, evapotranspiration, and light conditions were analyzed. And then the simulated values were obtained by the climatic estimation model of vegetation NPP. The results showed that there was very significant correlation between the simulated values and the observed values. The climatic estimation model and the simulated results of vegetation NPP were more stable and reliable. (4) The climatic productivity of vegetation NPP of Northeastern China in 2013 was 422～1 100 g C/(m2·a). The simulated values in the northern mountains were closer to the observed ones, but were greatly different in the southern area.
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备注/Memo
收稿日期:2016-07-21;改回日期:2016-08-05。
基金项目:中国气象局沈阳大气环境研究所2016年开放基金课题（2016SYIAE11）；2015年中国气象局气候变化专项（CCSF201512）
通讯作者:于成龙(1973-),男,黑龙江省桦川县人,博士,高级工程师,主要研究方向为生态气象。E-mail:nefuycl@163.com