土壤水分变化对草原植被群落及其光谱特征的影响  

Influence of Water Fluctuation on the Vegetation Structure and Spectral Reflectance Characteristics in the Typical Steppe

作　　者：师桂花[1] 王英舜[1] 侯琼 

机构地区：[1]锡林浩特国家气候观象台,锡林浩特026000 [2]内蒙古气象科研所,呼和浩特010051

出　　处：《中国农业气象》2013年第1期114-120,共7页Chinese Journal of Agrometeorology

基　　金：中国气象局公益行业专项(GYHY200906029);国家自然科学基金项目(30760102)

摘　　要：以锡林郭勒典型草原为研究区,于2008年5月-2009年5月,分别对不同水分条件下草地的光谱反射率、覆盖度和地上生物量进行测定,以研究草原植被群落及其光谱特征对土壤水分的响应。结果表明,水分波动对典型草原植被结构以及光谱特征具有明显的影响,其中水分充足(丰水年型)能够明显改善典型草原植被结构,增加牧草种类,提高牧草地上生物量,其植被光谱特征在旺盛生长期呈现出显著优势,4种典型植被指数较平水年型、歉水年型显著增加;枯黄期不同水分处理草地植被指数RVI之间呈显著差异(P<0.05),其余植被指数之间差异不显著;返青期不同水分处理草地植被指数DVI之间呈显著差异(P<0.05),其余植被指数之间差异不显著。Taking the Xilinguole typical steppe as experimental area of the observation, the spectral reflectance, above- ground biomass of grassland in different water treatments were measured and analyzed from May 2008 to May 2009. The results showed that amply irrigation improved grassland population and plant structure significantly, and increased the biomass of forage grasses. During vigorous growth period （July） , grassland under enough irrigation had significant advantage in spectral reflectance characteristics, and in the four vegetation indices. During dead ripe period, there were significant differences（ P 〈0. 05 ）among RVI （Ratio Vegetation Index） of grassland in different water treatment. During turning green period, there were significant differences （ P 〈 0. 05 ） among DVI （ Difference Vegetation Index） of grassland in different water treatment

关 键 词：典型草原 光谱特征 土壤水分 光谱反射率 植被指数 群落结构 

分 类 号：S812[农业科学—草业科学]