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基于改进的CASA模型模拟锡林郭勒草原植被净初级生产力

杨勇1,2,李兰花2,王保林2,宋向阳2,刘爱军2**,王明玖1**   

  1. 1内蒙古农业大学生态环境学院, 呼和浩特 010019; 2内蒙古自治区草原勘察规划院, 呼和浩特 010051)
  • 出版日期:2015-08-10 发布日期:2015-08-10

Simulation of net primary productivity by a satellite data-driven improved CASA model in Xilingol grassland.

YANG Yong1, LI Lan-hua2, WANG Bao-lin2, SONG Xiang-yang2, LIU Ai-jun2**, WANG Ming-jiu1**   

  1. (1College of Ecology and Environmental Science, Inner Mongolia Agricultural University, Huhhot 010019, China; 2Inner Mongolia Institute of Grassland Survey and Planning, Huhhot 010051, China)
  • Online:2015-08-10 Published:2015-08-10

摘要:

本研究在原来CASA模型的基础上,对模型参数最大光能利用率和水分胁迫系数的算法进行了改进,利用改进后的CASA模型模拟了2010年内蒙古锡林郭勒盟草原植被净初级生产力(NPP),并用地面实测样方数据对改进后的模型进行精度验证。结果表明:改进的CASA模型可应用于内蒙古草原小尺度植被NPP的估测,模拟NPP值与地面实测值之间的相关性达到显著水平(R2=0.829,P<0.05);2010年内蒙古锡林郭勒盟草原植被生长季(4—10月)NPP为284.64 g C·m-2·a-1,不同地区年均NPP相差较大,东北部东乌珠穆沁旗草原NPP高达411.11 g C·m-2·a-1,而西北部的二连浩特市草原NPP仅为158.87 g C·m-2·a-1;整体上,锡林郭勒盟草原的NPP由东向西逐步递减,这与该区域水热条件限制基本一致;由于降水量的时滞效应,该年度内NPP出现两次峰值;2010年锡林郭勒境内草原NPP集中分布在250~350 g C·m-2·a-1,草甸草原的NPP最大,典型草原次之,荒漠草原最小。

 

关键词: 星康吉鳗, 食物组成, 崂山湾, 摄食生态, 营养生态位, 食物网

Abstract: We improved the parameters of the maximum solar energy utilization efficiency and water stress coefficient algorithm of the original CASA model. The improved CASA model was verified by simulating the net primary productivity (NPP) of Xilingol grassland in 2010. Our results show that the improved CASA model could estimate small scale vegetation NPP in Inner Mongolia grassland, with significant correlation between simulated NPP and observed data (R2=0.829, P<0.05). On average, NPP in growing season (AprilOctober) of Xilingol grassland in 2010 was 284.64 g C·m-2·a-1. NPP was considerably different among different regions. For example, NPP was up to 411.11 g C·m-2·a-1 in Ujimqin grassland and 158.87 g C·m-2·a-1 in Erenhot City grassland. Consistent to the trend of regional water and heat variation, NPP of Xilingol grassland decreased from east to west. There were two peaks in the temporal pattern of NPP due to lag effect of precipitation. NPP in 2010 varied among different grassland types and was mostly in the range of 250-350 g C·m-2·a-1, in which the NPP of meadow steppes was the highest, followed by typical steppes, while NPP of desert steppes was the lowest.

Key words: food web, Lao-shan Bay., Conger myriaster, diet composition, feeding ecology, trophic niche