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叶骏菲,陈燕丽,莫伟华.典型喀斯特区植被变化及其与气象因子的关系——以广西百色市为例[J].沙漠与绿洲气象,2019,13(5):106~113
典型喀斯特区植被变化及其与气象因子的关系——以广西百色市为例
Vegetation variation and its relationship with meteorological factors in typical Karst area: A case study in Guangxi Baise city
投稿时间:2019-04-11  修订日期:2019-07-19
DOI:10.12057/j.issn.1002-0799.2019.05.016
中文关键词:  喀斯特地区  植被变化  降水量  气温
英文关键词:Karst area  vegetation variation  precipitation  temperature
基金项目:北部湾环境演变与资源利用教育部重点实验室(广西师范学院)和广西地表过程与智能模拟重点实验室(广西师范学院)开放或系统基金(GTEU-KLOP-K1703)
作者单位E-mail
叶骏菲 南宁市邕宁区气象局 247174044@qq.com 
陈燕丽 广西气象减灾研究所 cyl0505@sina.com 
莫伟华 广西气象科学研究所  
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中文摘要:
      利用2000-2017年广西典型喀斯特区MODIS NDVI卫星遥感影像,研究近20a来喀斯特地区植被及不同等级石漠化区植被时空变化状况,分析降水及气温与喀斯特地区植被变化的相关性,探讨植被变化与气象因子的关系。结果表明:(1)研究区植被及各石漠化等级区植被年内NDVI变化特征均表现出“夏秋高,冬春低”的趋势,随着石漠化等级加重,植被NDVI均值降低。植被NDVI峰值多出现在8月上旬至9月上旬,谷值出现在1月和2月上旬。但以灌草为主的轻、中、重石漠化区植被NDVI峰值出现时间较早,以乔木为主的潜在石漠化区植被NDVI峰值出现时间较迟。(2)2000-2017年百色全喀斯特地区及各等级石漠化区植被NDVI均呈改善趋势,且重度石漠化区植被改善趋势最明显,轻度石漠化区次之。研究区植被多为稳定变化和改善趋势,改善、变化不大和退化面积比例分别为38.27%、57.86%、4.87%。(3)平均气温和降水量与研究区植被NDVI相关性均较高,且平均气温与植被NDVI的相关性总体好于降水量。年尺度气温和降水量对植被NDVI影响均较明显,季度尺度上,秋季和春季气温降水对植被NDVI影响较大,冬季影响最小。目前气候变暖引起的增温幅度利于研究区植被生长,春夏季降水减少、秋季降水增多的气候变化趋势更利于研究区植被改善。
英文摘要:
      Abstract:Using the MODIS NDVI satellite remote sensing images during 2000 to 2017 of typical karst areas in guangxi, the spatial-temporal changes of vegetation in karst areas and rocky desertification areas of different grades in recent 20a were studied. The correlation between precipitation and temperature and vegetation changes in karst areas was analyzed, and the relationship between vegetation changes and meteorological factors was discussed. The results show that: (1) The NDVI variation characteristics of vegetation in Baise karst region and in each rocky desertification grade area showed a similar trend of high in summer and autumn, low in winter and spring, in addition, with the aggravation of rocky desertification grade, the average NDVI of vegetation decreased. The peak value of vegetation NDVI mostly appeared in early August to early September, and the valley value appeared in early January and February. However, the peak value of vegetation NDVI appeared earlier in light, medium and heavy rocky desertification areas dominated by shrubs and grasses, and later in potential rocky desertification areas dominated by trees. (2) The vegetation NDVI in Baise karst area and rocky desertification area showed an improvement trend during 2000 to 2017.Moreover, the vegetation improvement trend was the most obvious in the severe rocky desertification area, followed by the mild rocky desertification areaMost of the vegetation in the study area showed stable change and improvement trend, and the proportion of improved, stable and degraded area was 38.27%, 57.86% and 4.87%, respectively. (3) The correlation between average air temperature and precipitation and NDVI of vegetation in the study area was higher, and the correlation between average air temperature and NDVI of vegetation was generally better than that of precipitation. On the annual scale, the influence of temperature and precipitation on vegetation NDVI is obvious. On the quarterly scale, the influence of autumn and spring temperature and precipitation on vegetation NDVI is great, and the influence of winter is minimal. At present, the increase of temperature caused by climate warming is conducive to the growth of vegetation in this region. The decrease of precipitation in spring and summer and the increase of precipitation in autumn are more conducive to vegetation improvement in the study area.
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