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

doi:10.3969/j.issn.1000-6362.2016.01.014

Abstract

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

CHEN Xiao-min, CHEN Hui-lin, LI Wei-guang, LIU Shao-jun. Remote Sensing Monitoring of Spring Phenophase of Natural Rubber Forest in Hainan Province[J]. Chinese Journal of Agrometeorology, 2016, 37(01): 111-116.

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