干旱区研究

干旱区研究 ›› 2014, Vol. 31 ›› Issue (6): 1147-1152.doi: 10.13866/j.azr.2014.06.25

• 景观生态 • 上一篇    下一篇

祖历河流域自然草地生产力遥感反演

许宝泉1,2, 梁长利1, 蔡定建1, 施为群1, 孙国钧1   

  1. 1.江西理工大学资源与环境工程学院,江西 赣州 341000;
    2.江西省矿冶环境污染控制重点实验室,江西 赣州 341000
  • 收稿日期:2013-11-07 修回日期:2014-04-03 出版日期:2014-11-15 发布日期:2014-11-25
  • 通讯作者: 孙国钧. E-msail:sungj@lzu.edu.cn
  • 作者简介:许宝泉(1964-),男,博士,主要从事区域生态研究. E-msail:tianymbj@126.com
  • 基金资助:
    “973”预研项目“草地与农牧交错带生态系统生产力形成机制”(G2000028603)

Inversion of Natural Grassland Productivity from Remote Sensor Imagery in Zulihe River Basin

XU Bao-quan1,2, LIANG Chang-li1, CHAI Ding-jian1, SHI Wen-qun1, SUN Guo-jun1   

  1. 1. School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 3410010, Jiangxi, China;
    2. Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Ganzhou 341000, Jiangxi, China
  • Received:2013-11-07 Revised:2014-04-03 Published:2014-11-15 Online:2014-11-25

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5

摘要： 利用Landset_5 TM遥感影像数据,经几何校正、大气校正、辐射校正等前期处理后,计算比值指数(RVI)和再归一化植被指数(RNDVI),结合野外调查获得的自然草地生物量数据,在GIS中反演祖历河流域自然草地生物量,建立回归反演模型,并对两种植被指数的反演精度进行比较;利用RNDVI建立的模型,在Arc GIS的Grid模块中重采样计算,获得流域自然草地生物量的空间分布地理信息数据层。结果表明:RNDVI比RVI反演精度更高,相关系数R2=0.939(P=0.00)。从RNDVI和反演的生物量空间分布规律看,祖厉河流域自然植被生物量空间植被分布极不均匀,流域南部植被生物量明显高于北部地区,高海拔地区明显大于低海拔地区。从畜牧业可利用性分析,流域不可利用草地面积占总草地面积的53.16%,限制性可利用草地面积占总草地面积的28.67%,可利用草地面积仅占总草地面积的18.16%。因此,流域自然草地畜牧业养殖潜力有限,需结合家庭养殖发展畜牧业。

关键词: 植被指数, 草地生物量, 生物量反演, 黄土高原

Abstract: The re-normalized differential vegetation index (RNDVI) and ratio vegetation index (RVI) were calculated by using the Landsat 5 TM image data processed with geometric, atmospheric and radiometric calibrations. The natural grassland productivity GIS regression retrieval model was then established by using the above calculated indexes combined with the natural grassland biomass data from field work in the Zulihe River Basin. The accuracy of the indexes were assessed through the model. The results showed the RNDVI had a higher accuracy than RVI, with a correlation coefficient R2=0.939 (P=0.00). The spatial distribution of the natural grassland biomass was uneven across the Zulihe River Basin according to the RNDVI and the retrieved distribution. The vegetation biomass was apparently higher in the southern region than that in the north part. From the perspective of forage availability analysis, the unusable grassland accounted for 53.16% of the total grassland in the Basin while the usable grassland accounted for only 18.16%. The rest of the grassland, accounted for 28.67%, was restrictive usable. The animal husbandry would be limited by the natural grassland productivity and need to rely on livestock breeding to improve the population.

Key words: RNDVI, grassland biomass, productivity inversion, Loess Plateau