地理研究 ›› 2016, Vol. 35 ›› Issue (3): 513-524.doi: 10.11821/dlyj201603010
收稿日期:
2015-09-30
修回日期:
2015-12-20
出版日期:
2016-03-20
发布日期:
2016-03-20
作者简介:
作者简介:张喜旺(1979- ),男,河南辉县人,博士,副教授,主要从事生态环境遥感和GIS应用等研究.E-mail:
基金资助:
Received:
2015-09-30
Revised:
2015-12-20
Online:
2016-03-20
Published:
2016-03-20
摘要:
研究降雨--植被耦合关系对侵蚀产沙的影响,为侵蚀治理提供数据支持.基于TRMM降雨数据和MODIS 250 m NDVI,分析降雨和植被的年内分布模式和匹配关系,并构建降雨--植被耦合指数RV,用于反映侵蚀产沙状况.进一步利用年降雨量,NDVI以及其分布参数(峰度系数和偏斜度)与输沙量进行相关分析和多元回归分析.结果显示:降雨的集中,偏斜程度和波动性要比植被更为明显;RV与实际输沙量的相关系数为0.84,可以很好地反映侵蚀产沙的相对大小;年输沙量与降雨的分布参数相关性最高,达到0.94和0.87,对提高回归模型的拟合程度影响也最大;考虑降雨量,NDVI及其分布参数的模型的拟合程度最好,Ra2达到0.9232.因此,降雨与植被的年内匹配模式对侵蚀产沙具有重要影响.
张喜旺, 秦奋. 砒砂岩地区降雨与植被耦合关系对侵蚀产沙的影响[J]. 地理研究, 2016, 35(3): 513-524.
Xiwang ZHANG, Fen QIN. Coupling relationship of precipitation and vegetation and its influence for sediment yield in Pisha sandstone area[J]. GEOGRAPHICAL RESEARCH, 2016, 35(3): 513-524.
表2
年输沙量与相关影响参数的回归模型"
因变量 | 自变量 | 回归模型 | R2 | Ra2 | F | Sig |
---|---|---|---|---|---|---|
y | x1, x2 | y = 1.433x1 -461.656x2 + 693.651 | 0.5234 | 0.3872 | 3.8433 | 0.0748 |
y | x1, x2, x3, x4 | y = 0.068x1 + 23.712x2 + 64.157x3 -34.229x4 + 5.246 | 0.8998 | 0.8196 | 11.2248 | 0.0103 |
y | x1, x2, x5, x6 | y = 1.528x1 -296.450x2 + 176.245x5 -63.748x6 + 501.673 | 0.6688 | 0.4039 | 2.5244 | 0.1687 |
y | x1, x2, x3, x4, x5, x6 | y = -0.038x1 + 284.335x2 + 85.566x3 -80.435x4 + 90.794x5 -528.622x6 -100.283 | 0.9744 | 0.9232 | 19.0241 | 0.0174 |
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