Through using the tools of RS and GIS,the spatial distribution pattern of the climatic resources for agricultural production in the Farming,pastoral Zone in Northern China was analyzed in this paper.Six indices related to the features of the climates resources,including the annual mean daily temperature,mean daily temperature of growing season,cumulated temperature of growing season,precipitation of growing season,annual precipitation,and the sunshine hours,were selected for analyzing the thermal and moisture characteristics of the Zone.Those climatic data were processed by constructing the fuzzy membership function,single and integrated climatic resources,the efficiency index and the utilization coefficient of the climatic resources,and the resources suitability for agricultural production were appraised quantitatively by using the PCA method.The single indices include precipitation index,illumination index and thermal index.Through calculating the single indices,the key,limiting factor is identified.The integrated indices can indicate the interaction of the single indices and the efficient climatic resources and the climatic resources potential of the crops used in the study area.Based on the analysis,the spatial distribution pattern of the indices was further revealed through RS and GIS tools.The preliminary results are as follows:(1)Precipitation is the key limiting factor in the study area,and thus the spatial distribution of the moisture condition orientates towards,humid,moderately humid,moderately dry to dry,from southeast through northwest.(2)The spatial orientation of the climatic resources and the efficiency of the climatic resources are also from southeast to northwest,ranking from good to worse.(3)The utilization coefficient of the climatic resources is not so high,and its spatial distribution pattern shows a gradation of,from southeast to northwest,higher,high,low and lower.Those patterns of spatial distribution are more or less obvious in the middle part of the study area.
CHEN Hai, KANG Muyi, CAO Mingming
. Analysis on the Climatic Resources of the Farming,pastoral Zone in Northern China Based on RS and GIS[J]. JOURNAL OF NATURAL RESOURCES, 2006
, 21(2)
: 204
-209
.
DOI: 10.11849/zrzyxb.2006.02.006