Study On The Classification And Structure Analysis Of Land Types In Laiyuan County

Under the background of the construction of ecological civilization,the functions of production,life and ecology of the land has gradually become a hot issue in current academy world.The ecological function of land has a great impact on maintaining the normal operation of the ecological system,but at present there are still some phenomena of improper use of the land resources during the studying process of ecological functions.The root cause is that the limitation of the classification system and evaluation system of the land use cannot present the whole natural functions contained in the land completely.As a result,we must rediscover the land based on the most fundamental natural ecological characteristics.Moreover,the natural classification of land has become the fundamental way in today's development in that the classification is the important way to know and investigate things.In view of this,this paper takes Laiyuan County as the research area,referring to the land grading and classification standards at home and abroad and combining with the special differentiation regularity of the research area to construct the classification system of the land types.We also analyze the individual construction and ingredient construction of each land type under different ecological system and investigate the quantitative construction characteristics,spatial distribution characteristics and ecological characteristics as well as propose the development directions of the representative land types.The results of the study are as follows:(1)The land natural type classification system was constructed and land types were classified in Laiyuan county.According to the grading and classification standards of land at home and abroad,we construct the classification system of the land types.Combining the specific land differentiation regularity in the research area,we adopt the second land classification system and choose the the landform type,the vegetation group and the soil type to divide Laiyuan County into 78 types of land types which are named the "vegetation-soil-geomorphology" of continuous naming method.For example,hygrophilous mixed needle-width forest,coarse scattered leached cinnamon soil,low undulating and low mountain area with erosion.(2)From the two perspectives of individual structure and composition structure,the land type structure of different land ecosystems in Laiyuan county is analyzed.The individual construction characteristics of each ecological system in Laiyuan County are representative for the spatial construction and quantitative construction.There are vertical differences in the overall spatial structure of different land ecosystems,but there are still differences in local structure.In the farmland ecosystem,the concentric circular structure,the symmetrical structure and the strip as the branch extension structure are presented.In the forest ecosystem,the central part of the forest ecosystem is arranged with the band structure.The semi arc distribution is presented in the shrub ecosystem,and the aggregated distribution is presented in the grass ecosystem..There is also a difference in the quantity structure.In the farmland ecosystem,the loess shaped calcareous brown soil accumulation basin is the main land type,and its area reaches up to 10233.94hm2.In the forest ecosystem,the largest area is the hygrophilous broadleaved deciduous forest,limy brunisolic soil,low undulating and middle mountain area with erosion,in which diversity is present in land classification.In the shrub ecosystem,there are the dominant types of land in the basin,the valley and the low mountain ladder,which are the hygrophilous deciduous shrub,coarse scattered brown soil accumulation basin;the xeromorphy deciduous shrub,acid coarse bone soil,and the low undulating and low mountain area with erosion and the hygrophilous deciduous shrub and ludicrous soil valley.On the middle mountain ladder,the distribution of land types is diversified,mainly covered by the hygrophilous broadleaved deciduous forest,limy brunisolic soil,low undulating and middle mountain area with erosion.In the grass system,the basin and the vally are the absolutely dominant land types,which are hygrophilous grass,loessial and calcareous brown soil accumulation basin and hygrophilous grass,sandy loamy and flood alluvial brown soil valley.There are characteristics of diversity on the low and middle mountain ladders,mainly covered by the land types of xeromorphy grass,coarse scattered brown soil,low undulating and low mountain area with erosion and the hygrophilous grass,limy brunisolic soil,low undulating and middle mountain area with erosion.The ingredient construction characteristics are classified mainly by recognizing the ingredient construction characteristics on 78 land types in the research area to analyze the ecological element construction characteristics in each land type.(3)We propose the land ecology developing direction for Laiyuan County's typical land types,mainly including the land types suitable for agricultural development: the hygrophilous deciduous shrub,loessial and calcareous brown soil accumulation basin and the hygrophilous grass,loessial and calcareous brown soil accumulation basin.The land types suitable for forestry development are the xeromorphy deciduous shrub,coarse scattered leached cinnamon soil,low undulating and low mountain area with erosion;the hygrophilous deciduous shrub,coarse scattered brown soil accumulation basin;the hygrophilous grass,coarse scattered leached cinnamon soil,low undulating and low mountain area with erosion and the xeromorphy grass,coarse scattered leached cinnamon soil,low undulating and low mountain area with erosion.The land types unsuitable for agricultural development are 6 types in total: the crop limy brunisolic soil,low undulating and middle mountain area with erosion.In summary,this study is based on the construction of land classification system.Theindividual structure and composition structure of land types in various land ecosystems are explored,and the development direction of typical land types is put forward,which provide important theoretical and practical significance for the ecological construction,ecological planning,and local conditions for the distribution of agricultural,forestry and animal husbandry production and development of mountain resources.