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FOREST RESOURCES WANAGEMENT ›› 2022›› Issue (6): 68-75.doi: 10.13466/j.cnki.lyzygl.2022.06.011

• Scientific Research • Previous Articles     Next Articles

Two-Stage Sampling Estimation of Above-Ground Biomass of Pinus kesiya var.langbianensis Based on Remote Sensing Factors from Landsat8 OLI

NIE Jing1,2(), LU Chi1,2,3, OU Guanglong1,2, XU Hui1,2()   

  1. 1. Faculty of Forestry,Southwest Forestry University,Kunming 650224,China
    2. Key Laboratory of Southwest Mountain Forest Resources Conservation and Utilization,Ministry of Education,Southwest Forestry University,Kunming 650224,China
    3. Editorial Department of Journal,Southwest Forestry University,Kunming 650224,China
  • Received:2022-06-28 Revised:2022-10-08 Online:2022-12-28 Published:2023-01-16
  • Contact: XU Hui E-mail:2501542241@qq.com;swfc213@126.com

Abstract:

Based on Landsat8 OLI remote sensing imagery and the second class survey data of forest resources,taking Zhenyuan County,Pu'er City,Yunnan Province as the study area,with sampling accuracy (E) of 90% and reliability index (tα) of 95%,the two-stage sampling technique was applied,using AGB per unit area,above-ground accumulation per unit area,seven single bands and five vegetation indices of Simao pine in Zhenyuan County as the sampling markers,so that the overall sampling variance,coefficient of variation,standard error,absolute error,estimation accuracy,AGB estimation value and estimation error of different sampling schemes were analyzed and compared with simple random sampling and systematic sampling to analyze the comprehensive efficiency of different sampling methods applying different sampling marks.The results showed that:1) the comprehensive efficiency of the two-stage sampling was much higher than that of simple sampling and systematic sampling,2) The efficiency of the two-stage sampling based on single band and vegetation indices was generally better than which was based on the 2nd-class survey data,and the best sampling signs of the two-stage sampling efficiency were ARVI and NDVI,and only 154 samples were required for the two vegetation indices,which reduced the sample size by 60% compared with the two-stage sampling based on the 2nd-class survey data,and the precision could reach the highest,which were 97.50% and 97.67%,respectively.The two-stage sampling based on remote sensing factors could significantly improve the sampling efficiency.

Key words: remote sensing factor, 2nd-class survey, two-stage sampling, forest above-ground biomass, Pinus kesiya var. langbianensis

CLC Number: