Opportunities and challenges in using remote sensing for invasive tree species management, and in the identification of restoration sites in tropical montane grasslands

Arasumani, M.; Bunyan, Milind; Robin, V. V.

doi:10.1016/j.jenvman.2020.111759

Cited by 22 publications

(21 citation statements)

References 54 publications

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“…Fang et al [1] used multitemporal WV3 imagery to classify TS and obtained an OA of 61.3% for classifying 19 of the most abundant tree species and 73.7% for mapping ten of the most abundant genera. There are many studies to be done on using other VHR satellite sensors' imagery to map TS with a high accuracy, such as using Pléiades [34,65], GeoEye-1 [57,66], RapidEye [5,62], and Gaofen-2 [64,67].…”

Section: Optical Remote Sensing (Multi-/hyperspectral)mentioning

confidence: 99%

“…Such TS information is needed for many application purposes. They may include, but are not limited to, aiding forest resource inventories [1], assessing urban living environments (health, wellbeing, and aesthetics) [2], assessing and monitoring biodiversity [3], estimating urban vegetation biomass and carbon storage [4], and monitoring invasive plant species [5]. In this review, in general, TS is at the species level in a general plant classification system (i.e., variant, species, genus, and family); however, due to the different purposes of the reviewed studies using the same or similar remote sensing data and TS classification techniques/methods, studies on classifying tree variants, species groups, and even a few of forest (stand) species and types or urban TS were also reviewed.…”

Section: Introductionmentioning

confidence: 99%

“…(3) The distributions of the selected reference data should match the underlying assumptions of the applied methodology. (4) The observation errors of the reference data should be known and potential influence on the final results of TS classification should be discussed (5). All samples in the reference data should not be spatially overlaid.…”

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confidence: 99%

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Mapping Tree Species Using Advanced Remote Sensing Technologies: A State-of-the-Art Review and Perspective

2021

J Remote Sens

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Timely and accurate information on tree species (TS) is crucial for developing strategies for sustainable management and conservation of artificial and natural forests. Over the last four decades, advances in remote sensing technologies have made TS classification possible. Since many studies on the topic have been conducted and their comprehensive results and novel findings have been published in the literature, it is necessary to conduct an updated review on the status, trends, potentials, and challenges and to recommend future directions. The review will provide an overview on various optical and light detection and ranging (LiDAR) sensors; present and assess current various techniques/methods for, and a general trend of method development in, TS classification; and identify limitations and recommend future directions. In this review, several concluding remarks were made. They include the following: (1) A large group of studies on the topic were using high-resolution satellite, airborne multi-/hyperspectral imagery, and airborne LiDAR data. (2) A trend of “multiple” method development for the topic was observed. (3) Machine learning methods including deep learning models were demonstrated to be significant in improving TS classification accuracy. (4) Recently, unmanned aerial vehicle- (UAV-) based sensors have caught the interest of researchers and practitioners for the topic-related research and applications. In addition, three future directions were recommended, including refining the three categories of “multiple” methods, developing novel data fusion algorithms or processing chains, and exploring new spectral unmixing algorithms to automatically extract and map TS spectral information from satellite hyperspectral data.

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Section: Optical Remote Sensing (Multi-/hyperspectral)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mapping Tree Species Using Advanced Remote Sensing Technologies: A State-of-the-Art Review and Perspective

2021

J Remote Sens

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“…Since eradication of woody invasives like Acacias in grasslands is expensive due to their wide‐ranging impacts and large and long‐lived seed banks (Le Maitre et al 2011), areas with low‐invasion intensity should be prioritized for restoration in the Nilgiris (Arasumani et al 2021). Using remote sensing to incorporate other factors such as feasibility (e.g.…”

Section: Applying the Framework For Restoration Of The Invaded Shola‐grassland Ecosystem In South Indiamentioning

confidence: 99%

“…On the directions of a recent state high-court public interest litigation, the state forest departments are manually clearing invasives (Arasumani et al 2021). However, these invasives produce large seed banks, allowing them to rapidly recolonize many cleared areas (Unkule 2017, personal observation).…”

Section: Applying the Framework For Restoration Of The Invaded Shola-grassland Ecosystem In South Indiamentioning

confidence: 99%

Restoring tropical forest–grassland mosaics invaded by woody exotics

Raghurama

Sankaran

2021

Restoration Ecology

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Although important for biological conservation and provisioning of several ecosystem services, tropical forest–grassland mosaics face several threats, one of which is woody invasion in grasslands of these mosaics—an issue proving to be challenging to solve. We present a framework to guide grassland restoration in these mosaics that takes into account their unique ecology, outlines a general chronological sequence of restoration activities, and helps identify research priorities to guide restoration efforts. Specifically, we outline approaches to (1) increase the cost‐effectiveness of restoration programs (e.g. selecting restoration targets and priority sites); (2) restore edaphic processes impacted by woody invasion; (3) maximize the establishment of native grass and forb species, and (4) maintain restored communities in the long‐term by minimizing re‐invasions. We apply this framework to montane southern Indian forest‐grassland mosaics (locally called shola‐grassland mosaics) invaded by nitrogen‐fixing woody exotics to identify research priorities that can act as “game‐changers” in the restoration of these ecosystems. These include (1) identifying invaded areas where passive restoration can be effective, (2) understanding the role of endogenous disturbances, particularly fire, in the spread and management of invasive species and the prevention of re‐invasion, and (3) assessing the role of large‐scale seed farming and emerging seed technologies for the use of seeds to effectively re‐introduce native grassland species. Restoration frameworks that take into account unique ecologies are needed to make the most of the UN Decade on Ecosystem Restoration, and we present such a framework for forest‐grassland mosaics—an important ecosystem that is generally neglected.

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The effect of livestock grazing on plant diversity and productivity of mountainous grasslands in South America – A meta‐analysis

Sandoval‐Calderon,

Rubio Echazarra,

van Kuijk

et al. 2024

Ecology and Evolution

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Mountainous grasslands in South America, characterized by their high diversity, provide a wide range of contributions to people, including water regulation, soil erosion prevention, livestock feed provision, and preservation of cultural heritage. Prior research has highlighted the significant role of grazing in shaping the diversity and productivity of grassland ecosystems, especially in highly productive, eutrophic systems. In such environments, grazing has been demonstrated to restore grassland plant diversity by reducing primary productivity. However, it remains unclear whether these findings are applicable to South American mountainous grasslands, where plants are adapted to different environmental conditions. To address this uncertainty, we conducted a meta‐analysis of experiments excluding livestock grazing to assess its impact on plant diversity and productivity across mountainous grasslands in South America. In alignment with studies in temperate grasslands, our findings indicated that herbivore exclusion resulted in increased aboveground biomass but reduced species richness and Shannon diversity. The effects of grazing exclusion became more pronounced with longer durations of exclusion; nevertheless, they remained resilient to various climatic conditions, including mean annual precipitation and mean annual temperature, as well as the evolutionary history of grazing. In contrast to results observed in temperate grasslands, the reduction in species richness due to herbivore exclusion was not associated with increased aboveground biomass. This suggests that the processes governing (sub)tropical grassland plant diversity may differ from those in temperate grasslands. Consequently, further research is necessary to better understand the specific factors influencing plant diversity and productivity in South American montane grasslands and to elucidate the ecological implications of herbivore exclusion in these unique ecosystems.

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Opportunities and challenges in using remote sensing for invasive tree species management, and in the identification of restoration sites in tropical montane grasslands

Abstract: doi: bioRxiv preprint the identified restoration sites and restoring the grassland will be helpful in recovering lost habitat and ensuring the viability of populations of indigenous and endemic species and increasing streamflow.

Cited by 22 publications

References 54 publications

Mapping Tree Species Using Advanced Remote Sensing Technologies: A State-of-the-Art Review and Perspective

Mapping Tree Species Using Advanced Remote Sensing Technologies: A State-of-the-Art Review and Perspective

Restoring tropical forest–grassland mosaics invaded by woody exotics

The effect of livestock grazing on plant diversity and productivity of mountainous grasslands in South America – A meta‐analysis

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