中国农业气象

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海南岛天然橡胶林春季物候期的遥感监测

陈小敏,陈汇林,李伟光,刘少军   

  1. 海南省气象科学研究所,海口 570203
  • 收稿日期:2015-05-05 出版日期:2016-02-20 发布日期:2016-02-24
  • 作者简介:陈小敏(1984-),女,工程师,硕士,主要从事遥感、农业气候区划和农业气象等研究。
  • 基金资助:

    国家自然科学基金(41465005;41265007);海南省自然基金项目(20154172);海南省气象局科技创新项目(HN2013MS11;HNQXZD201501)

Remote Sensing Monitoring of Spring Phenophase of Natural Rubber Forest in Hainan Province

CHEN Xiao-min, CHEN Hui-lin, LI Wei-guang, LIU Shao-jun   

  1. Hainan Institute of Meteorological Sciences, Haikou 570203, China
  • Received:2015-05-05 Online:2016-02-20 Published:2016-02-24

摘要:

橡胶林第一蓬叶的展叶期、稳定期和老化速度,极大影响橡胶树叶片的数量和质量,从而影响干胶产量,因此,监测橡胶林春季叶片生长情况对防治病虫害、指导割胶作业和林间水肥管理具有积极意义。本研究基于2001-2014年1-5月每16d的遥感增强型植被指数(EVI)分布图,通过计算相邻时段EVI的变化量,分析橡胶林MODIS/EVI指数的时空分布及变化特征,确定判断橡胶叶片春季物候期的EVI指标。结果表明:第一蓬叶展叶期橡胶林平均EVI值为0.4,稳定期平均EVI值为0.5,以此作为这两个生育期的判断标准,对2001-2014年逐年橡胶林第一蓬叶的展叶期和稳定期进行反演,结果表明,海南岛橡胶林叶片平均展叶期出现在3月中旬前期,稳定期主要出现在5月上旬,叶片老化平均历时50d,与历年人工观测结果相比有一定差异,平均偏晚8.2d。该方法简便易行,可以用来监测区域天然橡胶物候的变化态势。

关键词: 橡胶, 物候, 展叶期, 稳定期, 遥感

Abstract:

The leaf-expansion stage, leaf-stable stage and aging rate for first rubber leave affect the quantity and quality of leaves and dry rubber yield significantly. Monitoring the growth stage for rubber leaves in spring is very necessary for controlling diseases and insect pests, guiding tapping and management sludge fertilizer. Based on enhanced vegetation index (EVI) distribution each 16 days from January to May from 2001 to 2014 in Hainan province, MODIS/EVI index of spatial-time distribution and variation characteristics were analyzed in this study, and spring phenophase EVI indicators for first rubber leave were determined. The results showed that the average EVI value for first rubber leave was 0.4 at leaf-expansion stage, 0.5 at leaf-stable stage. Taking two values as judgment standards, the inversion of two growth stages from 2001 to 2014 illustrated that the leaf-expansion stage and leaf-stable stage mainly occurred in middle March and early May, respectively. The average duration for leaves aging was 50 days, which was later 8.2d in average than observation data. But the method was simple and easy, could be used to monitor the change of regional natural rubber phenology.

Key words: Rubber, Phenophase, Leaf-expansion stage, Leaf-stable stage, Remote sensing