| The important commodity grain base of Heilongjiang Province in China has changed obviously in the past 20 years,especially under different terrain conditions,the dynamic change and degree of change of agricultural landscape pattern vary greatly.This paper is based on the classification data of land cover in Heilongjiang Province in2000,2010 and 2018,the dominant degree of utilization of elevation data and topographic data in Heilongjiang Province,the index of landscape pattern,overlap degree and dynamic degree.The changes of agricultural landscape dominated by cultivated land and including water and woodland were analyzed.The conclusions are as follows:(1)Heilongjiang Province is mainly divided into plain,platform,hilly,small undulating mountain and medium undulating mountain.The plain is mainly distributed in Qiqihar,Daqing,Jiamusi,Hegang,Suihua and other southwest Heilongjiang regions.The platform is mainly distributed in Heihe City,Suihua City,Harbin and other southeast,mainly distributed in Daxing'anling area,Mudanjiang City and other central areas.(2)The spatial and temporal distribution of agricultural landscape under different topographic characteristics.Agricultural landscape mainly studies cultivated land,woodland and water area.Among them,the agricultural landscape with cultivated land and water area is mainly distributed in plain and platform area,the hilly area is less,and the mountainous area is almost no.The main agricultural landscape of forest land is mainly distributed in hilly,medium and small undulating mountainous areas,and the plain and platform areas are less.From 2000 to 2018,the main change types of agricultural landscape in plain area were changed from woodland,water area to cultivated land,platform area from cultivated land to grassland,hilly area from woodland to unused land,and small undulating mountain area from woodland to grassland.(3)The spatial pattern analysis of agricultural landscape shows that the number and area of patches in hilly and mountainous areas are very small,and the distribution is uneven,and the degree of landscape fragmentation is high.The forest land is less distributed and scattered in the plain platform area,and the landscape in the hilly and mountainous area is relatively complete.Therefore,the degree of landscape fragmentation of the forest land landscape is in the plain,the platform is serious,and it is lower in the hilly and mountainous area.The landscape of cultivated land and water area is the dominant landscape in plain area,and the in mountainous areas.Cultivated land,woodland in hilly areas the most complex landscape,more difficult to use.Forestland landscape is difficult to use in plain and platform area,forestland landscape is difficult to use in plain,platform area is more complex forestland landscape is difficult to use,mountain area forestland landscape shape is more regular,easy to use,woodland land use efficiency increases.The area of water area in plain area has been reduced,the landscape shape tends to be complex,and the utilization ratio is reduced.The landscape of cultivated land in hilly area is more complex,difficult to use,and the stability is low.Forest land waters are in plain,platform,hilly area landscape is more complex,low stability,The landscape stability of mountain area is high.(4)Analysis of the degree of change of agricultural landscape.The change of plain area under five terrain in Heilongjiang area is remarkable,followed by hilly area.The annual change rate of the three agricultural landscapes in plain area is large,the number and area of patches in hilly and mountainous areas are very small,and the distribution is uneven,the area of cultivated land in plain area increases,the area of woodland In addition to the slight increase in the middle undulating mountains,the forest land is in a reduced state. |
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