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首页> 外文期刊>International journal of applied earth observation and geoinformation >An updated delineation of stand ages of deciduous rubber plantations during 1987-2018 using Landsat-derived bi-temporal thresholds method in an antichronological strategy
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An updated delineation of stand ages of deciduous rubber plantations during 1987-2018 using Landsat-derived bi-temporal thresholds method in an antichronological strategy

机译：在1987 - 2018年期间使用Landsat衍生的双颞阈值方法在抗核学策略中更新了落叶橡胶种植园的展示段

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Timely and accurately monitoring stand ages of deciduous rubber plantations is of great importance for ecological studies and plantations management. The re-establishment of rubber plantations usually experiences a short period (several years) of land clearance and transplantation of rubber seedlings, along with a noticeable landscape change from well-grown forest to bare land and sparse vegetation in situ. With Landsat times series (LTS) data of four commonly-used vegetation indices (VIs), namely the Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Normalized Difference Moisture Index (NDMI), and Normalized Burn Ratio (NBR), and three non-visible spectral bands, i.e. the near-infrared (NIR) and shortwave-infrared (SWIR1/2), in this study, an approach by combining the inter-annual defoliating and foliating features of rubber trees and the intra-annual landscape changes of rubber plantations was presented to detect and map stand ages of deciduous rubber plantations in an anti-chronological manner across Xishuangbanna between 1987 and 2018, one of the most intensive regions of deciduous rubber plantations within the tropics. The approach highlighted the repeated distribution of newly-cleared and replanted plot (NCRP) of rubber seedlings due to rubber management. It applied the bi-temporal VIs thresholds of zero of NBR and NDMI during the defoliation to foliation phases to delineate the stand ages of deciduous rubber plantations at an interval of five years, by combining a Landsat-based rubber map in 2018 and 32-year NCRPs as well as quadri-classified age-groups and seven subcategories (i.e. <= 5 as infantile rubber plantations (IRP), 6-10 as young rubber plantations (YRP), 11-15 and 16-20 as mature rubber plantations (MRP), 21-25, 26-30, and >= 31 years as old rubber plantations (ORP)). The results showed that the areas of IRP, YRP, MRP, and ORP were 19.1 km(2), 817.1 km(2), 1681.7 km(2), and 573.7 km(2) in 2018, respectively. Spatially, the YRP are mainly around the outskirts of two county-level administrative centers (Jinghong and Mengla), while ORP primarily distributed along main roads. Nearly 53.9% of ORP, 51.8% of IRP, 47.3% of MRP and 46.3% of YRP were in Jinghong City, and Mengla County had 50.5% of YRP, 48.8% of MRP, 42.4% of IRP and 36.3% of ORP. This study demonstrates that the bi-temporal VIs thresholds method (i.e. NBRdefoliation < 0, NDMIdefoliation, < 0, NBRfoliation < 0, and NDMIfoliation, < 0) have great potential for detecting stand ages of deciduous rubber plantations.
机译：及时，准确地监测落叶橡胶种植园的趋势是生态学研究和种植园管理的重要性。重新建立橡胶种植园通常经历一段短期（几年）橡胶苗的陆地间隙和移植，以及从生长的森林到裸陆和稀疏植被原位的明显景观变化。对于四个常用植被指数（VI）的Landsat时报（LTS）数据（VI），即归一化差异植被指数（NDVI），增强植被指数（EVI），归一化差异湿度指数（NDMI）和标准化烧伤比（NBR ）和三个不可见光谱带，即近红外（NIR）和短波红外（SWIR1 / 2），通过组合橡胶树的年度落叶和叶子特征来实现一种方法提出了橡胶种植园的横向变化，以在1987年至2018年间在西双版纳境内以抗长计时的方式检测和地图落地橡胶种植园静止衰减年龄。热带地区最密集的落叶橡胶种植园中最密集的地区之一。该方法突出了由于橡胶管理引起的新清除和Redranted Plot（NCRP）的重复分布。它在叶片阶段脱落期间将NBR和NDMI的零的双时间视觉阈值施加到叶面阶段，以在2018年和32年和32年的橡胶地图中划分了五年间隔为五年的落叶橡胶种植园的展台。 NCRPS以及Quadri分类年龄组和七个子类别（即<= 5作为婴儿橡胶园（IRP），6-10，作为幼苗种植园（YRP），11-15和16-20，作为成熟橡胶园（MRP ），21-25,26-30和> = 31年作为旧橡胶园（ORP））。结果表明，2018年，IRP，YRP，MRP和ORP的区域为19.1 km（2），817.1 km（2），1681.7公里（2）和573.7公里（2）。在空间上，YRP主要围绕两个县级行政中心（景洪和Mengla）的郊区，而ORP主要分布在主要道路上。近53.9％的ORP，51.8％的IRP，47.3％的MRP和46.3％的YRP在景洪市均为荆洪市，孟加拉县有50.5％的YRP，占MRP的48.8％，占IRP的42.4％和36.3％的ORP。该研究表明，双时颞Vis阈值方法（即NBRDFOLIALIENTIAL <0，NdMidefoligation，<0，NBRFoliation <0和Ndmifoliation，<0）具有检测落叶橡胶种植园的静止龄的潜力。

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