Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (4): 1094-1104.DOI: 10.11733/j.issn.1007-0435.2024.04.012

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Effects of Nitrogen and Phosphorus Application on Spectral Characteristics of Six Typical Grassland Dominant Species in Loess Hilly-gully Region

GUAN Ya-jun1,2, WANG Shao-yan2, CHEN Zhi-fei3, LUO Yang1,2, ZHOU Jun-jie1,2, JIAN Chun-xia2, XU Pei-dan1,2, MOU Ying-kun1,2, XU Bing-cheng2,4   

  1. 1. College of Grassland Agriculture, Northwest A&F University, Yangling, Shanxi Province 712100, China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling, Shanxi Province 712100, China;
    3. College of Life Sciences, Guizhou University, Guiyang, Guizhou Province 550025, China;
    4. Institute of Water and Soil Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shanxi Province 712100, China
  • Received:2023-10-09 Revised:2023-11-21 Published:2024-05-07

施氮磷肥对黄土丘陵区典型草地优势种光谱特征的影响

管雅君1,2, 王绍妍2, 陈志飞3, 罗杨1,2, 周俊杰1,2, 简春霞2, 许培丹1,2, 牟英坤1,2, 徐炳成2,4   

  1. 1. 西北农林科技大学草业与草原学院, 陕西 杨凌 712100;
    2. 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;
    3. 贵州大学生命科学学院, 贵州 贵阳 550025;
    4. 中国科学院水利部水土保持研究所, 陕西 杨凌 712100
  • 通讯作者: 徐炳成,E-mail:Bcxu@ms.iswc.ac.cn
  • 作者简介:管雅君(1999-)，女，汉族，江苏宿迁人，硕士研究生，主要从事林草生态研究，E-mail：yj_guan@nwafu.edu.cn
  • 基金资助:
    国家重点研发计划政府间国际科技合作专项(2018YFE0112400)资助

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Abstract: Exploring the spectral feature responses and differences of dominant species in grassland communities after fertilization is important for accurately evaluating the effects of grassland fertilization. Spectral characteristics of six dominant species (Bothriochloa ischaemum,Stipa bungeana,Lespedeza davurica,Potentilla tanacetifolia,Artemisia mongolica and Artemisia sacrorum) in the loess-hilly region was determined 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 application 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 index 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.

Key words: Red edge parameter, Vegetation index, Spectral characteristic, Grassland community, Loess Plateau

摘要： 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。

关键词: 红边参数, 植被指数, 光谱特征, 草地群落, 黄土高原

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