Dynamic evolution of vegetation and drainages in the Jiuzhaigou valley scenic area before and after the "8 August 2017" earthquake under conditions of travertine habitat conservation and restoration
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摘要: 利用Landsat-8、高分1号、2号等卫星影像,评估九寨沟核心钙华景点及整个景区在“8·8”地震前、后和钙华生境保育修复后植被覆盖度、土壤湿度、森林面积和水系面积的动态变化。结果显示:人工为辅、自然为主的钙华保育修复后钙华核心景点和整个景区的高植被、中低植被、低植被覆盖面积均有了显著增加,裸地生态类型仍存在,但呈逐年减少趋势,中植被覆盖类型较震后和震前减少;保育后第二年,湿润和很湿润面积、总森林面积和水系面积比震前和震后都有大幅增加,高植被覆盖度面积、森林面积和水系面积间存在正相关关系,可能是由于人工干预下原生境快速恢复,提高了植被覆盖面积,植被的蒸散和截流作用进一步影响了流域的水文过程,促进了水系面积的恢复。Abstract: The restoration of the original habitat after an earthquake is very important for rapid reconstruction of territorial vegetation and the restoration of the drainage area. In this study,the dynamic changes of vegetation coverage,soil moisture,forest area and river system area of the Jiuzhaigou valley core travertine scenic spot and the whole scenic spot before and after the 2017 earthquake and after the travertine habitat conservation and restoration were evaluated by using Landsat-8,and Gaofen 1#,2# satellite images. The results show that the coverage area of high,medium and low vegetations at the travertine core scenic spot and the whole scenic spot has increased significantly after the travertine conservation and restoration with artificial as auxiliary and natural as the main. The ecological types of bare land still exist,but show a decreasing trend year by year. In addition,the types of medium vegetation cover also decreased compared with those after and before the earthquake. In the second year after conservation,wet and very humid areas, total forest area and river system area increased significantly compared with before and after the earthquake. Overall,there is a positive correlation among high vegetation coverage area,forest area and river area. This may be due to the rapid restoration of original habitat under human intervention,which increased vegetation coverage area,and enhanced the roles of vegetation evapotranspiration and interception,and further affected the hydrological process of the watershed and promoted the restoration of the drainage area.
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[1] Newmark W D, Jenkins C N, Pimm S L, et al. Targeted habitat restoration can reduce extinction rates in fragmented forests[J]. Proceedings of the National Academy of Sciences, 2017, 114(36): 9635-9640. [2] 徐桂涛. 九寨沟地震对九寨沟景区林地的损毁及其修复[J].中国林业经济,2018(5):94-95. [3] 陈涛,牛瑞卿,李平湘,等. 密云水库流域2000-2005年植被覆盖度变化监测[J]. 环境科学与技术,2011,34(S2):190-195. [4] 程红芳,章文波,陈锋. 植被覆盖度遥感估算方法研究进展[J]. 国土资源遥感,2008,1(1):13-18. [5] 汪明霞,王卫东. 植被覆盖度的提取方法研究综述[J]. 黄河水利职业技术学院学报,2013,1(2):23-26. [6] 马中刚,孙华,王广兴,等. 基于Landsat 8-OLI的荒漠化地区植被覆盖度反演模型研究[J]. 中南林业科技大学学报,2016,36(9):12-18. [7] 刘洋,李春阳. 植被因子对水土流失的影响[J]. 世界科技研究与发展,2005,27(5):95-99. [8] 陈艳华,张万昌. 植被类型对温度植被干旱指数(TVDI)的影响研究:以黑河绿洲区为例[J]. 遥感技术与应用,2007,22(6):700-706. [9] 程伟,辛晓平. 基于TVDI的内蒙古草地干旱变化特征分析[J].中国农业科学,2020,53(13):2728-2742. [10] 高雅,王晓飞,高懋芳,等. 基于温度植被干旱指数的曲靖市干旱监测研究[J].中国农学通报,2020,36(9):37-45. [11] 蓝振江,蔡红霞,曾涛,等.九寨沟主要植物群落生物量的空间分布[J].应用与环境生物学报,2004,10(3):299-306. [12] 杨俊义. 九寨沟黄龙地区景观钙华的特征与成因探讨[D]. 成都:成都理工大学,2004. [13] 刘世荣,常建国,孙鹏森. 森林水文学:全球变化背景下的森林与水的关系[J]. 植物生态学报,2007,31(5):753-756. [14] 金栋梁,刘予伟. 森林水文效应的综合分析[J]. 水资源与水工程学报,2013,24(2):138-144. [15] 曾学梅. 云南石林岩溶区不同植被类型的生态水文效应研究[D]. 昆明:云南师范大学,2020. [16] Vitousek P M, Walker L R, Whiteaker L D, et al. Nutrient limitations to plant growth during primary succession in Hawaii Volcanoes National Park[J]. Biogeochemistry, 1993, 23(3): 197-215.
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