Kang, Yumei

Zhang, Guogang

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Study on Temporal‐Spatial Variability of Climatic Factors and Its Influence on Net Primary Production of Grassland in Inner Mongolia, China Guogang Zhang Kochi University, Japan Yumei Kang Kochi University, Japan Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/8-1/51 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　 瞯 ]919　 瞯Grasslands/Rangelands Resources and Ecology ——— Climate Change and Impact on Grasslands/RangelandsStudy on temporal‐spatial variability of climatic factors and its influence on net primaryproduction of grassland in Inner Mongolia , ChinaZhang Guogang , K ang YumeiFaculty o f A griculture , Kochi University , Kochi , 783‐8502 , Japan , E‐mail :z angguogang＠ 163 .comKey words : climatic factor , net primary production , GIS , water deficit , grasslandIntroduction The climatic factors , especially rainfall in semiarid and arid areas , have overriding effects on grasslandproductivity . The purpose of this study was to identify the relationship among precipitation , temperature , evaporation and netprimary production and then to estimate on effect of climate change on grassland productivity .Materials and methods The meteorological data sets from １９５７ to ２００６ that we used were collected from ４７ weather stations inInner Mongolia . The spatial distribution of climatic factors was analyzed with the Inverse Distance Weighted ( IDW) methodembedded in ARC/ INFO , which was based on GIS . The net primary production was calculated with the Synthetic model ( Zhouet al . , １９９６ ) .Results The mean precipitation of all ４７ stations in both May‐September and the whole year showed slight decreasing lineartrends , but neither was statistically significant ( Figure ２ ) . In contrast to rainfall amount , there was profound and significantincrease in the aspects of the temperature and evapotranspiration characteristics ; the biological temperature has been increasingby ０ . １８ ℃ average per １０ years ( data not shown ) . As a result of the precipitation decreasing and the potentialevapotranspiration increasing , the water deficit has become more and more severe ( Figure ２ ) . Because of climate change , thenet primary production of the grassland ecosystem has been decreasing year by year ( Figure ２ ) . Otherwise , the spatialdistribution of climatic factors showed an extreme imbalance , the distribution of precipitation descended gradually from east towest ( Figure １) , however , that of temperature and evapotranspiration was opposite .Figure 1 Sp atial distribution o f averageannual rain f all in the Inner Mongolia ,１９５７‐２００６ .　 　Figure 2 A verage annual amount o f p recip itation( P) , potential ev apotransp iration ( PEP) , w aterde f icit ( WD ) , grow th period Precip itation(GPP) and net p rimary p roduction ( N PP) .Conclusions The precipitation decreasing , climate warming , evapotranspiration increasing , and the spatial distributionimbalance of climatic factors resulted in the severe water deficit in the Inner Mongolia . This water deficit was the mainlimitating factor of the grassland productivity . The reasons above led to the drastic drop of net primary production of grasslandecosystem in Inner Mongolia in the past ５０ years .ReferenceZhou Guang‐sheng , Zhang Xin‐shi , １９９６ . Study on NPP of natural vegetation in China under global climate change . A ctaphytoecologica sinica , ２０(１ )１１‐１９ .mm (-j~ 550 { precipitaiton(mm) 450 D 0-100mm ..c; D 100-200mm :150 5 is - 200 - 300mm Q - 300-400mm 250 c::'., - >400mm " 0 150 ·p 4 u 511 .§ 8 a. -50 c '" -150 s ·c:: a. -2511 d) z: -350 

Study on Temporal‐Spatial Variability of Climatic Factors and Its Influence on Net Primary Production of Grassland in Inner Mongolia, China

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Study on Temporal‐Spatial Variability of Climatic Factors and Its Influence on Net Primary Production of Grassland in Inner Mongolia, China

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