文章摘要
罗晓玲, 杨梅, 李岩瑛, 蒋菊芳, 聂鑫.基于NDVI的石羊河流域植被演变特征及其对沙尘暴的影响分析[J].水土保持学报,2022,36(2):84~91
基于NDVI的石羊河流域植被演变特征及其对沙尘暴的影响分析
Analysis on Characteristics of Vegetation Evolution and Its Impact on Sandstorm in Shiyang River Basin Based on NDVI
投稿时间:2021-06-30  
DOI:10.13870/j.cnki.stbcxb.2022.02.011
中文关键词: 归一化植被指数  沙尘暴  变化趋势  影响分析  石羊河流域
英文关键词: NDVI  sandstorm  change trend  impact analysis  Shiyang River Basin
基金项目:国家自然科学基金面上项目(41975015)
作者单位E-mail
罗晓玲1, 杨梅1, 李岩瑛1,2, 蒋菊芳1, 聂鑫2 1. 甘肃省武威市气象局, 甘肃 武威 733000

2. 中国气象局兰州干旱气象研究所
, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020 
wwqxjym@163.com 
摘要点击次数: 69
全文下载次数: 63
中文摘要:
      利用石羊河流域2000-2016年卫星遥感数据和7个气象站1961-2020年逐日沙尘暴资料,使用一元回归趋势法、线性倾向率、相关系数等方法,分析该流域植被覆盖与沙尘暴频次、持续时间、强度的多尺度变化特征及关系,探讨其对沙尘暴发生发展的影响程度。结果表明:流域植被轻微增大,NDVI以每年0.0009的速度增大,2007年开始恢复,2010年以后恢复比较明显,上中游恢复速度比下游快。沙尘暴频次显著减少,年际倾向率为-2.8 d/10 a,近10年减少最显著,较70年代减少14.5天;中游减少速度较慢,下游减少速度较快;四季减少速度为春季>夏季>冬季>秋季。沙尘暴持续时间显著缩短,年际倾向率为-12.2 m/10 a,近10年持续时间最短,较70年代缩短了60.9 min;中游缩短时间较慢,下游缩短时间较快。沙尘暴强度无明显变化,最小能见度维持在0.496 km左右。沙尘暴频次和持续时间与当年和前1年 全流域NDVI、NDVI>0.3面积、上 中下游NDVI呈显著负相关。沙尘暴强度与当年全流域NDVI、NDVI>0.3面积、上中下游NDVI呈弱负相关,与前1年的NDVI因子呈弱正相关。流域植被覆盖的改善对沙尘暴有明显抑制作用。
英文摘要:
      Based on the satellite remote sensing data from 2000 to 2020 and the daily sandstorm data of seven meteorological stations from 1961 to 2020 in the Shiyang River Basin, we analyzed the multi-scale variation characteristics and relationship between watershed vegetation coverage and sandstorm frequency, duration and intensity, and explored its influence on the occurrence and development of sandstorm by using the methods of univariate regression trend method, linear tendency rate and correlation coefficient. The results showed that the watershed vegetation coverage increased slightly, and NDVI increased at the rate of 0.000 9 per year. The NDVI began to recover in 2007. Recovery was more obvious after 2010, and the recovery rates in the upper and middle reaches were faster than that in the lower reaches. The sandstorm frequency decreased significantly, and the interannual trend rate was -2.8 d/10 a. It decreased the most significantly in the past 10 years, which was 14.5 days less than that in the 1970s. The rate of reduction was slower in the middle reaches and that was faster in the lower reaches. The rate of reduction in four seasons followed the order of spring>summer>winter>autumn. The sandstorm duration was significantly shortened, the interannual trend rate was -12.2 m/10 a. The duration in the last 10 years was the shortest, which was 60.9 min shorter than that in the 1970s. The shorting time in the middle reaches was slower and that was faster in the lower reaches. The sandstorm intensity had no obvious change, and the minimum visibility was around 0.496 km. The frequency and duration of sandstorm were negatively correlated with full-basin NDVI, NDVI >0.3 area, NDVI of upper, middle and lower reaches in the current year and the previous year. The sandstorm intensity had a weak negative correlation with full-basin NDVI, NDVI >0.3 area, NDVI of upper, middle and lower reaches, and a weak positive correlation with NDVI of the previous year. The improvement of vegetation cover in the watershed had obvious restraining effect on sandstorm.
查看全文   查看/发表评论  下载PDF阅读器
关闭