地球信息科学学报 ›› 2014, Vol. 16 ›› Issue (5): 824-832.doi: 10.3724/SP.J.1047.2014.00824

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基于HJ-1A/B CCD数据的河南省平原绿化分析

刁慧娟1,2(), 王正兴1,,A;*(), 于信芳1   

  1. 1. 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室,北京 100101
    2. 中国科学院大学,北京 100049
  • 收稿日期:2013-12-27 出版日期:2014-09-10 发布日期:2014-09-04
  • 通讯作者: 王正兴 E-mail:diaohj@lreis.ac.cn;wangzx@igsnrr.ac.cn
  • 作者简介:

    作者简介:刁慧娟(1989-),女,安徽宿州人,硕士生,研究方向为资源环境遥感应用。E-mail:diaohj@lreis.ac.cn

  • 基金资助:
    中国科学院战略性先导科技专项“应对气候变化的碳收支认证及相关问题”(XDA05050102);中国科学院重点部署项目子专题“东南亚森林数据库建设及森林变化研究”(KZZD-EW-08-01-02-01)

Analysis of Plain Afforestation in Henan Province Using HJ-1A/B CCD

DIAO Huijuan1,2(), WANG Zhengxing1,*(), YU Xinfang1   

  1. 1. Data Center for Resources and Environmental Sciences, State Key Laboratory of Resources and Environmental Information System, Institute of Geographical Sciences and Natural Resources Research, Beijing 100101, China
    2. The Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-12-27 Online:2014-09-10 Published:2014-09-04
  • Contact: WANG Zhengxing E-mail:diaohj@lreis.ac.cn;wangzx@igsnrr.ac.cn
  • About author:

    *The author: WANG Jiacheng, E-mail:shanqiangw@fync.edu.cn

摘要:

平原绿化在未来农林发展中具有重要地位。本文利用环境卫星(HJ-1 A/B)多时相数据,选择河南省6月冬小麦收割后的CCD数据,直接去除第二季作物,并利用4月份第一季作物播种前的CCD数据,剔除了一季作物,以及[(NDVI4月≥0.22)与(NDVI6月≥0.35)]提取平原绿化的信息,其与26个主要城市城区绿化信息进行的相关分析达到显著水平(R2=0.9166)。因此,该区的平原绿化解译效果好,而南部信阳市以一季水稻为主的地区及“水稻-冬小麦”过渡区,解译效果较差。除信阳外,由HJ-1卫星解译的河南平原绿化总面积6909.8 km2,占2010年河南省森林面积20.53%。

关键词: 平原绿化, 环境卫星, 农田林网, 作物物候

Abstract:

The term “afforestation” in this paper generally represents all kinds of non-crop vegetation in crop-dominated plain area, including but not limited to the vegetation in crop land (e.g., orchard, herb, nursery garden, fast-growing and high-yielding timber, farmland shelterbelt, and artificial turf), residential green, urban vegetation landscapes, trees planted alongside the roads and rivers, and the wind break and sand fixation forest. Accurate and timely information about afforestation in the plain region is useful because it can reflect the degree of agricultural diversity and the environmental health. However, getting the information about afforestation using remote sensing is hindered by some factors: afforestation are spatially scattered, temporally and spectrally overlapped with some crop lands. In addition, as a land use type, afforestation in plains often shares common spaces with other types of land use, such as croplands and roads. As a result, there is little, if any, data about afforestation in plains, let alone the afforestation change monitoring. As a follow-up to UN Millennium Ecosystem Assessment, the Chinese government is currently conducting a similar assessment at the provincial level, covering years of 2000-2005-2010, and using the traditional (FAO) land cover/land use system. It is beyond the expectation that the “forest” - as the major indicator of a good environment, in the province such as Henan, has only experienced a negligible increase. This is simply because the recent afforestation in plains was classified as other land cover types. With the advent of Chinese satellite HJ-1 A/B in September 2008, there may be a chance to extract information about afforestation in plains since its CCD sensor has Red and NIR channels, with a 30m spatial resolution and a 4-day temporal resolution. To test this potentiality, three steps were taken to extract afforestation in this study: (1) extract the plain information using 2010 Land Cover Map; (2) eliminate the double-crop (winter wheat) land using NDVIJune data when all the wheat had been harvested; (3) eliminate the single-crop land using NDVIApril data. Afforestation was extracted by calculating ((NDVIApril≥0.22)∩(NDVIJune≥0.35)). Validation was conducted using correlation with the statistics of 26 major cities, resulting in a significant R2=0.9166. The algorithm performed well in the wheat region, yet it did poor in the rice and rice-wheat transition regions, which are mainly distributed in the southern part of Xinyang. Aside from Xinyang, afforestation area extracted from HJ-1 is 6909.8 km2. This accounts for 20.53% of the total forest in Henan Province. Future study should make full use of HJ-1 high temporal resolution data by conducting zoning according to the climate and the soil.

Key words: plain afforestation, HJ-1 A/B CCD, NDVI, farmland shelterbelt, crop phenology