Reviewing the Spectral Variation Hypothesis: Twenty years in the tumultuous sea of biodiversity estimation by remote sensing

Ecological Informatics, Год журнала: 2024, Номер 82, С. 102702 - 102702

Опубликована: Июль 3, 2024

Twenty years ago, the Spectral Variation Hypothesis (SVH) was formulated as a means to link between different aspects of biodiversity and spatial patterns spectral data (e.g. reflectance) measured from optical remote sensing. This hypothesis initially assumed positive correlation variations computed raster in environment, which would turn correlate with species richness: following SVH, areas characterized by high heterogeneity (SH) should be related higher number available ecological niches, more likely host when combined. The past decade has witnessed major evolution progress both terms remotely sensed available, techniques analyze them, questions addressed. SVH been tested many contexts variety sensing data, this recent corpus highlighted potentials pitfalls. aim paper is review discuss methodological developments based on leading knowledge well conceptual uncertainties limitations for application estimate dimensions biodiversity. In particular, we systematically than 130 publications provide an overview ecosystems, characteristics (i.e., spatial, temporal resolution), metrics, tools, applications strength association SH metrics reported each study. conclusion, serves guideline researchers navigating complexities applying offering insights into current state future research possibilities field estimation data.

Язык: Английский

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Biodiversity and carbon stocks of the understory vegetation as indicators for forest health in the Zabarwan Mountain Range, Indian Western Himalaya

Ecological Indicators, Год журнала: 2024, Номер 159, С. 111685 - 111685

Опубликована: Фев. 1, 2024

Carbon stock and diversity of species together address the two most pressing concerns for successful ecosystem functioning management, namely climate change biodiversity loss. Understory vegetation is a significant indicator plant biodiversity, contributing to forest carbon storage, sustaining species, providing many ecological services. However, little research has been done about contribution understory in forests, likely because these components only make up small portion total ecosystem. To fill this knowledge gap, current study sought baseline (shrub herb) from Zabarwan Mountain Range. Data on characteristics five different types were gathered using random sample method. Using Pearson method, we calculated correlation coefficient between parameters stock. The average was determined be 3.93 Mg C/ha (1.55–9.2 C/ha). shrub layer contributed maximum value 82 % increasing trends Parrotiopsis < Broad-leaved Oak Acacia Pinus forest. Species-wise, jacquemontiana found contribute 3.11 (47.76 %) can regarded as key restoration Himalayan forests. decreasing order Shannon–Wiener index area > Overall, data show that coniferous-dominated woodlands had higher stocks than other kinds woodlands. acquired highlights importance storage region. provides strong evidence maintaining management practices enable encourage planting multiple layers landscape approaches improve while resistance change.

Язык: Английский

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Spatial and temporal evolution characteristics of the water conservation function and its driving factors in regional lake wetlands—Two types of homogeneous lakes as examples

Ecological Indicators, Год журнала: 2021, Номер 130, С. 108069 - 108069

Опубликована: Авг. 5, 2021

Water conservation is the core wetland ecological function. The pattern of water in geography often exhibits local spatial heterogeneity. In this paper, Dongting Lake (DT) and Poyang (PY) wetlands were taken as research objects, yield (WY) module Integrated Valuation Ecosystem Services Trade-offs (InVEST) model was used to spatially quantify conservation, with aim revealing differences homogeneous wetlands. We observed spatio-temporal changes WY over six periods from 1998 2018 multivariate analysis variance (MANOVA) system cluster method explore patterns driving factors DT PY results follows: (1) two showed declining trends, but trend more obvious. (2) exhibited a sensitive response climate than wetland. (3) From perspective level, generally high, while low. (4) Climate change main contributor direct factor production, socio-economic indirect factors. (5) effect cover on significant among types, indicating that drivers had clear relationship landscape transfers types. (6) InVEST applicable for evaluating lake conservation. summary, paying attention heterogeneous homogenous regions can help us understand impact Additionally, rational adjustment forces conducive safety management.

Язык: Английский

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Spatial asynchrony matters more than alpha stability in stabilizing ecosystem productivity in a large temperate forest region

Global Ecology and Biogeography, Год журнала: 2022, Номер 31(6), С. 1133 - 1146

Опубликована: Март 13, 2022

Abstract Aim Understanding the biodiversity–stability relationship has become a central issue in ecology and conservation biology. Although stabilizing effects of tree species diversity on ecosystem productivity are well recorded small local communities, they remain poorly understood across scales (from to larger spatial scales). This study evaluates from large temperate forest region, considering range environmental conditions heterogeneity. Location North‐eastern China ( c . 700,000 km 2 ). Time period 2005–2017. Major taxa studied Woody plants. Methods We define stability as temporal invariability biomass productivity. Regional metacommunities representing were developed by aggregating multiple sets field plots. Simple regression analysis was used test relationships metacommunities. Piecewise structural equation modelling then disentangle abiotic variables at scales. Multiple mixed‐effects models determine relative contribution individual predictive Results found that (alpha diversity) positively related communities stability), whereas turnover space (beta asynchronous dynamics among (spatial asynchrony), regardless whether factors considered or not. also heterogeneity affected The effect asynchrony gamma greater than alpha stability. Main conclusions Our results imply is key maintaining within region. suggest diverse forests heterogeneous landscapes should be sustained buffer negative climate change degradation.

Язык: Английский

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Environmental heterogeneity increases the conservation value of small natural features in karst landscapes

The Science of The Total Environment, Год журнала: 2023, Номер 872, С. 162120 - 162120

Опубликована: Фев. 9, 2023

Local biodiversity hotspots are often located within regions where extreme and variable environmental - e.g., climatic soil conditions occur. These areas conservation priorities. Although heterogeneity is recognised as an important determinant of biodiversity, studies focusing on the effects multiple components in same ecosystem scarce. Here we investigate how topography related microclimatic variables properties may influence value karst landscapes. Karst landscapes world contain millions dolines (i.e. bowl- or funnel-shaped depressions) that function 'small natural features' with a disproportionately large role maintaining relative to their size. We assessed diversity microclimates, soils vegetation relationships six microhabitats (south-facing slopes, east-facing west-facing north-facing slopes bottoms dolines, adjacent plateau) for nine grassland ecosystem. there were remarkable differences among these (e.g., representation different species groups, presence 'climate relicts'), each microhabitat had rare absent other landscape. found studied exhibited highly promoted high types unique composition, contributing topographic, climatic, soil, land cover Therefore, our findings highlight local have crucial importance. As widespread topographic features many throughout world, results could be directly applied well. An integrated approach urgently needed provide guidelines landscape management, promoting retention small vulnerable climate change and/or various disturbances.

Язык: Английский

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A Forest Fire Susceptibility Modeling Approach Based on Light Gradient Boosting Machine Algorithm

Remote Sensing, Год журнала: 2022, Номер 14(17), С. 4362 - 4362

Опубликована: Сен. 2, 2022

A forest fire susceptibility map generated with the model is basis of prevention resource allocation. more reliable helps improve effectiveness Thus, further improving prediction accuracy always goal modeling. This paper developed a based on an ensemble learning method, namely light gradient boosting machine (LightGBM), to produce accurate map. In modeling, subtropical national park in Jiangsu province China was used as case study area. We collected and selected eight variables from occurrence driving factors for modeling correlation analysis. These are topographic factors, climatic human activity vegetation factors. For comparative analysis, another two popular methods, logistic regression (LR) random (RF) were also applied construct models. The results show that temperature main factor produced map, extremely high areas classified by LR, RF, LightGBM 5.82%, 18.61%, 19%, respectively. F1-score higher than LR RF LightGBM, 88.8%, 84.8%, 82.6%, area under curve (AUC) them 0.935, 0.918, 0.868, introduced method shows better ability performance evaluation metrics.

Язык: Английский

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Effects of farmland landscape pattern on spatial distribution of soil organic carbon in Lower Liaohe Plain of northeastern China

Ecological Indicators, Год журнала: 2022, Номер 145, С. 109652 - 109652

Опубликована: Ноя. 14, 2022

Knowledge of the factors affecting spatial distribution farmland soil organic carbon (SOC) contribute to a better understanding impact human activities on soil, which is important for improving quality and mitigating climate change. Intensive production has brought about significant changes in landscape pattern. However, consequences this change SOC remains unclear. In study, using 307 sampling sites Lower Liaohe Plain, we mapped by Kriging method, investigated relationship between topographic SOC, then nine indexes were used as indicator activity intensity describe pattern analyzed SOC. We observed that was positively related mean annual precipitation (MAP), negatively temperature (MAT). Flat terrain weakened represent complexity patch shape, contagion connectivity degree patches, indicated with high connectivity, regular shape not conducive sequestration. Also, stepwise regression analysis showed MAP, MAT DEM contributed most variation, these could explain 29.3% variation While added Aggregation Index (AI) improve explanation 3.1%, AI became strongest factor after natural factors. This study highlights role influencing The results are useful supplement may provide support sequestration through regulating controlling

Язык: Английский

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Different extinction debts among plants and arthropods after loss of grassland amount and connectivity

Biological Conservation, Год журнала: 2021, Номер 264, С. 109372 - 109372

Опубликована: Ноя. 5, 2021

A decrease in habitat amount and connectivity causes immediate or delayed species extinctions transformed landscapes due to reduced functional connections among populations altered environmental conditions. We assessed the effects of present historical grassland as well local factors typical landscape on current richness specialist generalist plants arthropods fragments. surveyed herbaceous plants, ants, orthopterans, true bugs rove beetles 60 dry fragments Hungary. recorded area focal grassland, slope cover woody vegetation. By using maps landscape, we calculated for four time periods covering 158 years (1858–2016). found evidence an unpaid extinction debt suggesting that they have not come equilibrium with yet. This localised typically long-lived group responded slowly changes. Specialist arthropod taxa short generation times much faster loss than did show debt. Generalist animals adapted a wide range habitats were affected by landscape-scale decline habitats. Despite decreased connectivity, conditions high heterogeneity can sustain landscapes. Unpaid should be considered early warning signal: Restoration is necessary halt ongoing processes.

Язык: Английский

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Topographic depressions can provide climate and resource microrefugia for biodiversity

iScience, Год журнала: 2023, Номер 26(11), С. 108202 - 108202

Опубликована: Окт. 21, 2023

Microrefugia are often located within topographically complex regions where stable environmental conditions prevail. Most of the studies concerning distributions climate change-sensitive species have emphasized dominance cold air pooling over other factors, such as resource availability. There is a shortage information on relationships among topography-related microsite diversity, microclimate, availability, and composition in microrefugia. To fill this knowledge gap, we studied effects microclimatic soil resources plant occurrence adjacent to 30 large topographic depressions (i.e., dolines) two distant karst regions. Our results showed that both microclimate availability may play key role maintaining biodiversity dolines; therefore, they simultaneously act Establishing climate-smart conservation priorities strategies required maintain or increase refugial capacity safe havens.

Язык: Английский

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A machine learning-based approach for flash flood susceptibility mapping considering rainfall extremes in the northeast region of Bangladesh

Advances in Space Research, Год журнала: 2024, Номер unknown

Опубликована: Окт. 1, 2024

Язык: Английский

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