摘要
喀斯特地貌区生态环境脆弱,研究其生态效应可以有效减少区域水土流失,促进生态质量提升。本文以我国典型喀斯特地区贵州省清镇市作为研究区,以2008年、2013年和2018年三期Landsat遥感影像作为数据源,解译生成了研究区土地利用专题图。利用InVEST模型的生物多样性模块和碳储量模块,定量分析了研究区的生境质量和碳储量在2008~2018年的时空变化,探讨了时空变化的原因。结果表明:研究区生境质量在2008~2018年总体呈增加趋势,生境质量平均值由0.679增加到0.710,变化率在4.57%左右,增幅不明显。增长量最大的部分位于研究区的中部和西南部,即为犁倭乡中部、站街镇和红枫湖镇的西南部以及卫城镇的中部。研究区碳储量在2008~2018年总体呈增加趋势,总碳储量范围在0.4536~1.0107kg·m-2,研究年间平均碳储量为0.977kg·m-2;总碳储量在研究年间增加了0.75%,由2008年的133460.7t增加到了2018年的135457.06t。研究区主要坡度集中在6°~15°,碳储量在坡度上呈差异性,平均碳储量在陡坡处最大,为1kg·m-2左右,而总碳储量分布在缓坡处最大,为696061.43t,主要是受研究区地形影响;研究区生境质量随坡度的增加而增加,险坡处最高达到0.81,主要是由于随着坡度增加,人类活动也在不断减少,植被覆盖率不断增加,生境质量也不断提高。
The ecological environment of the karst landform is fragile.Studying its ecological effects can reduce regional soil erosion effectively and promote ecological quality.In this paper,Qingzhen City,GuizhouProvince,is used as a research area in China’s typical karst area.Landsat remote sensing images in 2008,2013 and 2018 are used as data sources to interpret and generate maps of land use in the study area.The InVEST model’s biodiversity module and carbon storage module were used to quantitatively analyze the spatial and temporal changes of habitat quality and carbon storage in the study area from 2008 to 2018,and explore the reasons for space-time changes.The results showed that:The habitat quality of the study area increased from 2008 to2018,and the average habitat quality increased from 0.679 to 0.710.The change rate was about4.57%,and the increase was not obvious.The largest part of the growth is located in the central and southwestern part of the study area,which is the central part of the town of LiWo Town,the Zhanjie town and the southwest of Hongfenghu Town,and the middle of WeiCheng Town.The carbon storage in the study area increased from 2008 to 2018.The total carbon storage ranged from 0.4536 to 1.0107 kg·m-2.The average annual carbon storage during the study period was 0.977 kg·m-2.The total carbon storage was studied.It increased by 0.75%during the year,from 133460.7 tin 2008 to 135457.06 tin 2018.The main slope of the study area is concentrated at 6°~15°.The carbon storage is different in slope.The average carbon storage is the largest at the steep slope,about 1 kg·m-2,and the total carbon storage is the largest at the gentle slope,which is 696061.43 t,mainly affected by the topography of the study area;the habitat quality of the study area increases with the increase of the slope,and the highest slope reaches 0.81,mainly because the human activities are also decreasing with the increase of the slope,the vegetation coverage rate is increasing,and the habitat quality is improved.It is also constantly improving.
作者
闫瑾
YAN Jin(College of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China;Shaanxi Key Laboratory of Land Consolidation,Xi’an 710054,China)
作者简介
闫瑾(1996-),女,陕西宝鸡人,在读硕士,研究方向:生态系统服务权衡,E-mail:704219006@qq.com。
