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Modeling aboveground biomass of an alpine desert grassland with SPOT-VGT NDVI

机译：利用SPOT-VGT NDVI模拟高寒荒漠草地地上生物量

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摘要

Grassland biomass on the Qinghai-Tibet Plateau is of great significance for the study of wildlife habitat and climate change. Based on Systeme Pour l'Observation de la Terre Vegetation normalized difference vegetation index (NDVI) data from 1998 to 2012 and a field survey investigation in 2013, we assessed aboveground biomass (AGB) dynamics in the Altun Mountain Nature Reserve. The results demonstrated that annual NDVI values varied greatly with an increasing trend. Areas of high- and medium-coverage grassland showed similar increasing trends. The NDVI-biomass relationship could be quantified by an exponential model and previous models over-estimated the amount of biomass in the alpine desert grassland. The total biomass was estimated to be 62 x 10(6) kg per year with large annual variations. No significant relationship was found between AGB and soil organic carbon contents, and the total grassland area (NDVI > 0.1) was positively correlated with the annual average temperature.
机译：青藏高原的草地生物量对于研究野生动植物的生境和气候变化具有重要意义。基于1998年至2012年植被观测系统标准化差异植被指数（NDVI）数据和2013年的现场调查，我们评估了阿尔敦山自然保护区的地上生物量（AGB）动态。结果表明，年度NDVI值变化趋势很大。高，中覆盖草地面积呈相似的增长趋势。 NDVI与生物量的关系可以通过指数模型来量化，而先前的模型则高估了高寒沙漠草地中生物量的数量。每年的总生物量估计为62 x 10（6）kg，且年度变化很大。 AGB与土壤有机碳含量之间没有显着关系，草地总面积（NDVI> 0.1）与年平均温度呈正相关。

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  • 来源
    《GIScience & remote sensing》 |2015年第6期|680-699|共20页
  • 作者

    Liu Shiliang; Su Xuku; Dong Shikui; Cheng Fangyan; Zhao Haidi; Wu Xiaoyu; Zhang Xiang; Li Junran;

  • 作者单位

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China;

    Nat Reserve Adm Altun Natl Nat Reserve, Kuerle 841000, Peoples R China;

    Univ Tulsa, Dept Geosci, Tulsa, OK 74104 USA;

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  • 正文语种 eng
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  • 关键词

    climate change; vegetation change; soil organic carbon; NDVI; Altun Mountain Nature Reserve;

    机译：气候变化植被变化土壤有机碳NDVI阿尔屯山自然保护区;

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