热带地理
熱帶地理
열대지리
TROPICAL GEOGRAPHY
2014年
1期
76-86
,共11页
北部湾海岸带%NDVI%Hurst指数%植被覆盖
北部灣海岸帶%NDVI%Hurst指數%植被覆蓋
북부만해안대%NDVI%Hurst지수%식피복개
the Beibu Gulf coastal zone%NDVI%Hurst index%vegetation cover
分析北部湾海岸带植被覆盖动态变化趋势，能为开展海岸带植被生态环境监测提供决策。以2000-2011年SPOT-VEGETATION逐旬NDVI数据为基础，采用MVC（最大值合成法）、标准差、线性趋势分析（SLOPE）和Hurst指数等数理统计方法对研究区植被覆盖时空变化特征及未来趋势进行定量分析。结果表明：1）研究区植被覆盖整体上处于变好的状态，在年尺度上呈现出“波动-明显改善”的趋势，且海岸带东岸与西岸的植被变化趋势快于丘陵地区；在季节尺度上NDVI的增长速率为：秋季＞夏季＞春季＞冬季；在月尺度上NDVI在6-11月植被生长迅速，而在1-4月则生长缓慢；2）NDVI均值的空间分布规律自东北-西南中心线呈现出“两头高、中心地带低”的趋势，且NDVI均值自西向东的变化规律为-0.026/1N°，具有经向地带性特点；3）NDVI的Hurst指数值为0.3065~0.9953，平均值为0.7774，反持续性序列（15.78%）＜持续性序列（84.22%），未来总体植被覆盖呈现出持续性改善趋势。未来需要重点进行保护的植被区域主要集中在十万大山的西南部、钦江流域的上游以及合浦县的西南部。
分析北部灣海岸帶植被覆蓋動態變化趨勢，能為開展海岸帶植被生態環境鑑測提供決策。以2000-2011年SPOT-VEGETATION逐旬NDVI數據為基礎，採用MVC（最大值閤成法）、標準差、線性趨勢分析（SLOPE）和Hurst指數等數理統計方法對研究區植被覆蓋時空變化特徵及未來趨勢進行定量分析。結果錶明：1）研究區植被覆蓋整體上處于變好的狀態，在年呎度上呈現齣“波動-明顯改善”的趨勢，且海岸帶東岸與西岸的植被變化趨勢快于丘陵地區；在季節呎度上NDVI的增長速率為：鞦季＞夏季＞春季＞鼕季；在月呎度上NDVI在6-11月植被生長迅速，而在1-4月則生長緩慢；2）NDVI均值的空間分佈規律自東北-西南中心線呈現齣“兩頭高、中心地帶低”的趨勢，且NDVI均值自西嚮東的變化規律為-0.026/1N°，具有經嚮地帶性特點；3）NDVI的Hurst指數值為0.3065~0.9953，平均值為0.7774，反持續性序列（15.78%）＜持續性序列（84.22%），未來總體植被覆蓋呈現齣持續性改善趨勢。未來需要重點進行保護的植被區域主要集中在十萬大山的西南部、欽江流域的上遊以及閤浦縣的西南部。
분석북부만해안대식피복개동태변화추세，능위개전해안대식피생태배경감측제공결책。이2000-2011년SPOT-VEGETATION축순NDVI수거위기출，채용MVC（최대치합성법）、표준차、선성추세분석（SLOPE）화Hurst지수등수리통계방법대연구구식피복개시공변화특정급미래추세진행정량분석。결과표명：1）연구구식피복개정체상처우변호적상태，재년척도상정현출“파동-명현개선”적추세，차해안대동안여서안적식피변화추세쾌우구릉지구；재계절척도상NDVI적증장속솔위：추계＞하계＞춘계＞동계；재월척도상NDVI재6-11월식피생장신속，이재1-4월칙생장완만；2）NDVI균치적공간분포규률자동북-서남중심선정현출“량두고、중심지대저”적추세，차NDVI균치자서향동적변화규률위-0.026/1N°，구유경향지대성특점；3）NDVI적Hurst지수치위0.3065~0.9953，평균치위0.7774，반지속성서렬（15.78%）＜지속성서렬（84.22%），미래총체식피복개정현출지속성개선추세。미래수요중점진행보호적식피구역주요집중재십만대산적서남부、흠강류역적상유이급합포현적서남부。
Based on the 10-day SPOT-VEGETATION NDVI data during the period of 2000-2011, by using the mathematical-statistics methods of MVC (maximum synthesis), standard deviation, SLOPE (linear trend analysis) and Hurst index, this paper analyzes the characteristics of temporal-spatial change of vegetation cover and its future trend in the coastal zone around the Beibu Gulf. The results indicate that:1) The vegetation cover in the study area has been changing better, showing a“volatility-significant improvement”trend on year scale. At the same time, the vegetation trends of the east and west coast grow faster than that of the hilly areas;On seasonal scale the growth rate of NDVI is autumn>summer>spring>winter;On monthly scale the NDVI grows faster from June to November, whereas slowly from January to April; 2)The spatial distribution of mean NDVI in northeast-southwest centerline shows the trend of “high at two ends and low in central” and the law of mean NDVI variation from west to east is-0.026 per 1No, which also shows a meridional zonality;3)The NDVI value of Hurst index ranges from 0.306 5 to 0.995 3, with a mean of 0.777 4, anti-sustained sequence (15.78%)<sustained sequence (84.22%), and overall vegetation cover in future presents a trend of continuous improvement. The protected vegetation cover area is mainly concentrated in the southwest of the Shiwan Mountains, upper reaches of the Qinjiang River and the southwest of Hepu County in future.
