首页|施氮磷肥对黄土丘陵区典型草地优势种光谱特征的影响

施氮磷肥对黄土丘陵区典型草地优势种光谱特征的影响

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探讨施肥后草地群落优势种光谱特征响应和差异,对准确评价草地施肥效应有重要意义.以黄土丘陵区6个典型优势种[白羊草(Bothriochloa ischaemum)、长芒草(Stipa bungeana)、达乌里胡枝子(Lespedeza davurica)、菊叶委陵菜(Potentilla tanacetifolia)、蒙古蒿(Artemisia mongolica)和铁杆蒿(Artemisia sacrorum)]为对象,测定并提取了不同施氮磷处理下的7个光谱特征参数.结果表明:相比未施肥,单施氮或磷均降低6个优势种在"蓝谷"、"绿峰"和"红谷"处的光谱反射率;氮磷配施后,各优势种的红边幅值(AMP)和红边面积(Sred)呈增加趋势,白羊草、达乌里胡枝子、菊叶委陵菜和铁杆蒿的差值植被指数(DVI)均增大.结果表明,光谱特征参数可有效反映黄土丘陵区草地优势种的氮磷施肥效应,植被指数DVI,NDVI和GNDVI相比RVI更适合于评价草地群落优势种对施氮磷肥的响应和差异.
Effects of Nitrogen and Phosphorus Application on Spectral Characteristics of Six Typical Grassland Dominant Species in Loess Hilly-gully Region
Exploring the spectral feature responses and differences of dominant species in grassland commu-nities after fertilization is important for accurately evaluating the effects of grassland fertilization.Spectral characteristics of six dominant species(Bothriochloa ischaemum,Stipa bungeana,Lespedeza davurica,Po-tentilla tanacetifolia,Artemisia mongolica and Artemisia sacrorum)in the loess-hilly region was deter-mined and analyzed,and seven spectral parameters were also extracted for evaluating the differences among the dominant species after N and P fertilizer applications.Compared to no fertilization,the individual appli-cation of N or P fertilizers reduced the spectral reflectance of the six dominant species at"Blue Valley","Green Peak"and"Red Valley".The amplitude(AMP)and red edge area(Sred)of each dominant species generally showed an increasing trend following N and P co-application,and the difference vegetation index(DVI)values of B.ischaemum,L.davurica,P.tanacetifolia and A.sacrorum exhibited an increasing trend.All these findings indicated that the spectral characterization parameters could effectively reflect the effects of N and P fertilization on grassland dominant species in loess hilly-gully region,and vegetation in-dex such as DVI,NDVI and GNDVI were more suitable to evaluate the response and differences among grassland dominant species to N and P fertilization than RVI.

Red edge parameterVegetation indexSpectral characteristicGrassland communityLoess Plat-eau

管雅君、王绍妍、陈志飞、罗杨、周俊杰、简春霞、许培丹、牟英坤、徐炳成

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西北农林科技大学草业与草原学院,陕西杨凌 712100

西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌 712100

贵州大学生命科学学院,贵州贵阳 550025

中国科学院水利部水土保持研究所,陕西杨凌 712100

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红边参数 植被指数 光谱特征 草地群落 黄土高原

国家重点研发计划政府间国际科技合作专项

2018YFE0112400

2024

草地学报
中国草学会

草地学报

CSTPCD北大核心
影响因子:1.156
ISSN:1007-0435
年,卷(期):2024.32(4)
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