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不同利用状况下草原遥感估产模型

陶伟国1,2;徐斌1,2;刘丽军2;杨秀春1,2;覃志豪1,2   

  1. 1农业部资源遥感与数字农业重点开放实验室, 北京 100081;
    2中国农业科学院农业资源与农业区划研究所, 北京 100081
  • 收稿日期:2006-04-14 修回日期:1900-01-01 出版日期:2007-03-15 发布日期:2007-03-15

Yield estimation model for different utilization status grassland based on remote sensing data

TAO Wei-guo1,2; XU Bin1,2; LIU Li-jun2; YANG Xiu-chun1,2; QIN Zhi-hao1,2   

  1. 1Key Laboratory of Resources Remote Sensing and Digital Agricultural of Agriculture Ministry, Beijing 100081, China;
    2Institute of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2006-04-14 Revised:1900-01-01 Online:2007-03-15 Published:2007-03-15

摘要: 在内蒙古自治区的温性草甸草原、温性草原、温性荒漠草原、温性草原化荒漠和温性荒漠5种具有代表性的草地类型区地面观测数据的基础上,考虑草地的利用状况信息,分类建立了产草量与4种植被指数(由MODIS数据计算得到)的回归估产模型,将利用状况这一定性变量作为虚拟变量与遥感估算模型相结合,找出了3种利用状况下的鲜草产量最优混合估算模型和估算指数。结果表明:(1) EVI是反映产草量变化的最好指标,分类构建的模型平均测产精度达到了80%;(2)将利用状况作为虚拟变量考虑之后建立的混合测算模型精度达到了79%,明显高于利用状况未知时构建的混合模型的精度,比分类建模应用更简洁方便。

关键词: 河流连续统, 生态系统服务, 生态系统健康, 生态系统管理, 流域生态学

Abstract: Based on the observation data obtained from five representative steppes, i . e . , temperate meadow steppe, temperate steppe, temperate desert steppe, temperate steppe-desert and temperate desert in Inner Mongolia, regression models were established to express the relations between each grassland biomass and four vegetation indices, with the information about grassland utilization status considered. The qualitative variable utilization status was introduced into remote sensing estimation models as a dummy variable, and the optimal mixed estimation models and vegetation indices for three types of utilization status were selected. The results showed that EVI was the best index reflecting grassland yield variation, and the average estimation precision of the models was 80%. The precision of the mixed models introduced with utilization status (mixed model Ⅱ) arrived to 79%, being higher than that of the models without the information of utilization status. Comparing with the models established for different utilization status, mixed model Ⅱ had the advantages of concision and convenience.

Key words: River continuum concept, Ecosystem services, Ecosystem health, Ecosystem management, Watershed ecology