特尔特地区的饲料和土地覆盖变化动态：利用地理空间和实地调查数据。埃塞俄比亚南部博拉纳牧场

Dynamics of forage and land cover changes in Teltele district of Borana rangelands, southern Ethiopia: using geospatial and field survey data.

机构信息

State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, 830011, China.

National Engineering Technology Research Center for Desert-Oasis Ecological Construction, Beijing, 100049, China.

出版信息

BMC Ecol. 2020 Oct 7;20(1):55. doi: 10.1186/s12898-020-00320-8.

DOI:10.1186/s12898-020-00320-8

PMID:33028276

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7539436/

Abstract

BACKGROUND

The gradual conversion of rangelands into other land use types is one of the main challenges affecting the sustainable management of rangelands in Teltele. This study aimed to examine the changes, drivers, trends in land use and land cover (LULC), to determine the link between the Normalized Difference Vegetation Index (NDVI) and forage biomass and the associated impacts of forage biomass production dynamics on the Teltele rangelands in Southern Ethiopia. A Combination of remote sensing data, field interviews, discussion and observations data were used to examine the dynamics of LULC between 1992 and 2019 and forage biomass production.

RESULTS

The result indicate that there is a marked increase in farm land (35.3%), bare land (13.8%) and shrub land (4.8%), while the reduction found in grass land (54.5%), wet land (69.3%) and forest land (10.5%). The larger change in land observed in both grassland and wetland part was observed during the period from 1995-2000 and 2015-2019, this is due to climate change impact (El-Niño) happened in Teltele rangeland during the year 1999 and 2016 respectively. The quantity of forage in different land use/cover types, grass land had the highest average amount of forage biomass of 2092.3 kg/ha, followed by wetland with 1231 kg/ha, forest land with 1191.3 kg/ha, shrub land with 180 kg/ha, agricultural land with 139.5 kg/ha and bare land with 58.1 kg/ha.

CONCLUSIONS

The significant linkage observed between NDVI and LULC change types (when a high NDVI value, the LULC changes also shows positive value or an increasing trend). In addition, NDVI value directly related to the greenness status of vegetation occurred on each LULC change types and its value directly linkage forage biomass production pattern with grassland land use types. 64.8% (grass land), 43.3% (agricultural land), 75.1% (forest land), 50.6% (shrub land), 80.5% (bare land) and 75.5% (wet land) more or higher dry biomass production in the wet season compared to the dry season.

摘要

背景

草原逐渐转变为其他土地利用类型，是影响特尔特莱草原可持续管理的主要挑战之一。本研究旨在调查土地利用和土地覆盖（LULC）的变化、驱动因素和趋势，以确定归一化植被指数（NDVI）与牧草生物量之间的联系，并确定牧草生物量生产动态对埃塞俄比亚南部特尔特莱草原的相关影响。本研究结合遥感数据、实地访谈、讨论和观测数据，以调查 1992 年至 2019 年期间 LULC 的动态和牧草生物量的生产。

结果

研究结果表明，农田（35.3%）、裸地（13.8%）和灌木地（4.8%）显著增加，而草地（54.5%）、湿地（69.3%）和林地（10.5%）减少。在草地和湿地部分观察到的较大土地变化是在 1995-2000 年和 2015-2019 年期间发生的，这是由于特尔特莱草原在 1999 年和 2016 年分别受到厄尔尼诺现象的影响。不同土地利用/覆盖类型的牧草数量，草地具有最高的平均牧草生物量，为 2092.3kg/ha，其次是湿地，为 1231kg/ha，林地为 1191.3kg/ha，灌木地为 180kg/ha，农田为 139.5kg/ha，裸地为 58.1kg/ha。

结论

在 NDVI 和 LULC 变化类型之间观察到显著的关联（当 NDVI 值较高时，LULC 变化也显示出正值或增长趋势）。此外，NDVI 值直接与每个 LULC 变化类型上发生的植被绿色状态相关联，其值与草地土地利用类型的牧草生物量生产模式直接相关。与旱季相比，雨季草地（64.8%）、农田（43.3%）、林地（75.1%）、灌木地（50.6%）、裸地（80.5%）和湿地（75.5%）的干生物量生产更高或更高。