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[1]DU Bobo,Alatengtuya,BAO Gang,et al.Simulation of Net Primary Productivity of Xilingol Grassland Based on CASA Model[J].Research of Soil and Water Conservation,2021,28(05):293-300.

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Simulation of Net Primary Productivity of Xilingol Grassland Based on CASA Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 293-300 Column: Public date: 2021-08-20

Title:: Simulation of Net Primary Productivity of Xilingol Grassland Based on CASA Model

Author(s):: DU Bobo¹,Alatengtuya^2,3,BAO Gang^2,3,WANG Ning¹,LIN Kejian¹; (1.Institute of Grassland Research of CAAS,Hohhot 010010,China; 2.College of Geographical Science,Inner Mongolia Normal University,Hohhot 010022,China; 3.Inner Mongolia Key Laboratory of Remote Sensing and Geograph Information System,Hohhot 010022,China)

Keywords:: CASA model; Xilingol grasslands; net primary productivity; maximum light use efficiency

CLC:: TP79; P426.68

DOI:: -

Abstract:: With the change of climate,the global ecological environment has changed greatly. Net primary productivity(NPP),as an important index to reflect the ecological quality,has been widely used in the ecological monitoring. In order to investigate the response of NPP to climate change in growing season in Xilingol grassland from 2001 to 2018,the NPP of Xilingol grassland was simulated by CASA model. The results show that,in the past 18 years,the NPP in the grassland of the Xilingol meadow had the significant increase,and the interannual variation of NPP in the four types of vegetation was larger; the difference of NPP was obvious,decreasing from the east to the west,and was agreement with the vegetation type. The temperature and precipitation were the main factors causing NPP space-time variation,and the overall NPP was negatively correlated with the temperature dominant(r=-0.629,p=0.05,N =18),which was positively correlated with the precipitation significance(r =0.913,p< 0.001,N =18). For different vegetation types,the effects of precipitation and temperature on NPP were also different. Meadow grassland and desert grassland were affected by temperature and precipitation,while typical grassland and sandy land vegetation were mainly affected by precipitation,and the correlation with temperature was low and not significant. From the perspective of space,most areas of the whole area were affected by precipitation. The areas affected by temperature mainly concentrated on the desert grassland in the west,the typical grassland in the middle and the grassland in the northeast of the research area.

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Last Update: 2021-08-20