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    湖北省1990—2021年土地覆盖变化与景观格局演变

    The change of land cover and the evolution of landscape pattern in Hubei Province from 1990 to 2021

    • 摘要:
      研究目的 研究湖北省1990—2021年土地覆盖变化及景观格局变化趋势,科学揭示湖北省土地覆盖变化的影响因素和影响机制,为该区域开展耕地保护及土地利用规划提供数据和理论支撑。
      研究方法 本文以湖北省多年土地覆盖为研究对象,在收集不同自然因素(气温、降雨)、人文因素(人口密度、GDP)基础上,采用景观格局分析等方法,分析湖北省1990—2021年土地覆盖的时空变化特征和影响因素。
      研究表明 (1)湖北省耕地1990—1999年呈现增加趋势,1999—2021年呈现减少趋势。林地1990—2000年呈现减少趋势,2000—2021年呈现增加趋势。灌木、草地、荒地整体呈现减少趋势,水体、不透水面整体呈现增加趋势。(2)耕地转出为林地的面积是5923.93 km2,占耕地转出量的49.82%;林地转出为耕地的面积是7960.43 km2,其占林地转出量的95.98%;不透水面转出为水体的面积为137.49 km2,占不透水面转出面积的82.61%;各地类转化中,林地转为耕地面积及占比均最高。(3)湖北省土地覆盖中湿地破碎度指数较高,林地相对较低;分形维数中荒地较高且呈现上升趋势,湿地较低;景观形状指数中林地较高,荒地较低。耕地动态度为−0.072,林地动态度为−7.5×10−5,灌木动态度为−2.66,草地动态度为−2.47,水体动态度为0.26,荒地动态度为−2.37,不透水面动态度为6.69,湿地动态度为−0.93,不透水面快速增加对其他地类侵占需引起重视。(4)耕地面积与人口密度成正相关,与降雨、气温、GDP成负相关;林地、不透水面面积与人口密度成负相关,与降雨、气温、GDP成正相关;GDP、人口密度对地类面积影响大于降雨、气温,且GDP对不透水面影响最大。
      结论 景观格局分析方法能够反映湖北省土地覆盖面积变化特征,对于土地管理具有指示意义。降雨、气温、人口密度、GDP指标与土地覆盖面积变化存在相关性,能够用于湖北省土地覆盖变化成因分析。

       

      Abstract:
      This paper is the result of geological survey engineering.
      Objective To study the trends of land cover changes and landscape pattern changes in Hubei Province from 1990 to 2021, we scientifically reveal the influencing factors and mechanisms of land cover changes in Hubei Province, and provide data and theoretical support for cultivated land protection and land use planning in this region.
      Methods This paper takes the land cover in Hubei Province over many years as the research object. Based on the collection of different natural factors (temperature, rainfall) and humanistic factors (population density, GDP), Adopt methods such as landscape pattern analysis to analyze the spatio−temporal variation characteristics and influencing factors of land cover in Hubei Province from 1990 to 2021.
      Results (1) The cultivated land in Hubei Province showed an increasing trend from 1990 to 1999 and a decreasing trend from 1999 to 2021. The forest land showed a decreasing trend from 1990 to 2000 and an increasing trend from 2000 to 2021. Shrubs, grasslands, and wasteland generally showed a decreasing trend, while water bodies and impervious surfaces generally showed an increasing trend. (2) The area of cultivated land converted into forest land was 5923.93 km2, accounting for 49.82% of the transferred area of cultivated land. The area of forest land converted into cultivated land was 7960.43 km2, accounting for 95.98% of the transferred area of forest land. The area of impervious surfaces converted into water bodies was 137.49 km2, accounting for 82.61% of the transferred area of impervious surfaces. Among the conversions of various land types, the area and proportion of forest land converted into cultivated land were both the highest. (3) The fragmentation index of wetlands in the land cover of Hubei Province was relatively high, while that of forest land was relatively low. In terms of the fractal dimension, wasteland had a relatively high value and showed an upward trend, while wetlands had a relatively low value. In terms of the landscape shape index, forest land had a relatively high value, while wasteland had a relatively low value. The dynamic degree of cultivated land was −0.072, that of forest land was −7.5×10−5, that of shrubs was −2.66, that of grasslands was −2.47, that of water bodies was 0.26, that of wasteland was −2.37, that of impervious surfaces was 6.69, and that of wetlands was −0.93. The rapid increase of impervious surfaces and their encroachment on other land types need to be paid attention to. (4) The cultivated land area is positively correlated with population density, and negatively correlated with rainfall, temperature and GDP. The area of forest land and impervious surface is negatively correlated with population density, and positively correlated with rainfall, temperature and GDP. GDP and population density have a greater impact on the area of land types than rainfall and temperature, and GDP has the greatest impact on the impervious surface area.
      Conclusions The landscape pattern analysis method can reflect the characteristics of the changes in the land cover area of Hubei Province, and it has indicative significance for land management. The indicators such as rainfall, temperature, population density, and GDP are correlated with the changes in the land cover area of Hubei Province, and they can be used for the analysis of the causes of land cover changes in Hubei Province.

       

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