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This study investigates the water relations mechanism of Rhododendron campanulatum (D. Don) in treeline areas of the Himalayan region, emphasizing its vital role in ecosystem dynamics. The species, commonly found as krummholz forms at treeline ecotones, exhibits notable population advancement 1.4 m/yr, which could lead to the densification of the ecotone in the future. Seasonal measurements of soil moisture at depths of 15cm, 30cm, and 45cm, as well as pre-dawn (Ψ PD ) and mid-day (Ψ MD ) water potentials, and leaf conductance in the forenoon (gw AM ) and afternoon (gw PM ), were conducted for both trees and seedlings. Significant variations were observed among sites, seasons, and years across various parameters, including soil moisture and water potential components. The study underscores the most negative water potentials (Ψ) during winters, with Ψ PD reaching -0.88 MPa for trees and -1.43 MPa for seedlings. Seasonal changes in water potential (ΔΨ) ranged from 0.11 to 0.82 MPa for trees and 0.20 to 0.90 MPa for seedlings. Osmotic potential at full turgor (OP Full ) declined from winter to summer, ranging from -0.74 to -1.76 MPa in trees and -0.45 to -1.60 MPa in seedlings. Relative water content (RWC%) of seedlings varied between 68.00% and 87.40%. Leaf conductance ranged from 19.50 to 329.68 m mol m -2 sec -1 in trees and 43.60 to 331.40 m mol m -2 sec -1 in seedlings. The study highlights the adaptation of R . campanulatum and other broad-leaved evergreen species to high-altitude climatic irregularities, emphasizing the crucial role of snowmelt and monsoon rains in mitigating water stress. Osmotic adjustment and high relative water content enable R . campanulatum to cope with environmental changes, maintaining water availability for photosynthesis.

Advanced Control of Aircraft, Spacecraft and Rockets introduces the reader to the concepts of modern control theory applied to the design and analysis of general flight control systems in a concise and mathematically rigorous style.

Betula utilis exhibits intriguing characteristics and interactions with its environment and has specific adaptations that enable it to thrive in various water conditions. Drought has a prominent role in influencing the growth and development of vegetation, while temperature serves as a crucial determinant of species distribution in high-altitude environments. The investigation was centered on the eco-physiological dimension of B. utilis in areas near the treeline. Across different seasons, sites, and years, the most negative pre-dawn twig water potentials (Ψ PD ) and mid-day twig water potentials (Ψ MD ) were − 0.81 and − 1.24 MPa, respectively. The highest seasonal change (ΔΨ) in twig water potential (Ψ twig ) was in the post-monsoon season. Osmotic potential at full turgor (Ψπ 100 ) declined by − 0.66 MPa and osmotic potential at zero turgor (Ψπ 0 ) declined by − 1.07 MPa. The highest leaf conductance (gw) of 380.26 mmol m −2  s −1 was measured in the afternoon. During the initiation of flowering, Ψ PD of the twig was − 0.72 MPa and gradually rose to − 0.17 MPa by the end of the flowering period. This study provides key insight into the Ψ dynamics, leaf conductance, and phenology of B. utilis , highlighting its adaptation to changing environmental conditions and the need for effective management strategies to ensure the resilience and conservation of this Critically Endangered species.

Key messageOur study on tree bark thickness across the major forest types of Central Himalayas indicates that the higher relative bark thickness at an early age is a key fire adaptational feature.In this study, we have primarily examined the relationship between fire incidence, bark thickness, relative bark thickness and related characters of the dominant tree species across the major forest type of Central Himalayas (29° 20′–29° 23′ N latitude and 79° 23′–79° 30′ E longitude) differing in fire incidences. The forest fires are human-ignited, small, and patchy surface fires and their incidences vary considerably across the forest types: 472.4 (fires/year) in Pinus roxburghii forests (between 1000 and 2000 m); 50.2 (fires/year) in Shorea robusta forests in the foothills; 7.4 (fires/year) in Quercus leucotrichophora forests (1200–2700 m); and rare in P. wallichiana forests (> 1800 m). With regard to bark traits, we focus on absolute bark thickness, and relative bark thickness. Our analysis of bark-related traits showed that bark thickness and bark development at an early age are directly correlated with fire exposure, indicating the role of fire in the species dominance. With increasing diameter of trees, bark thickness increases but relative bark thickness decreases in all tree species, indicating that allocation to bark decreases as trees become big hence less vulnerable to fire. The relative bark thickness declines more with tree size in species exposed more to fires than those less expose to fire. Our analysis has contributed to highlighting the bark thickness as a functional feature, with implication for community composition.

Ecosystem functioning and management are primarily concerned with addressing climate change and biodiversity loss, which are closely linked to carbon stock and species diversity. This research aimed to quantify forest understory (shrub and herb) diversity, tree biomass and carbon sequestration in the Binsar Wildlife Sanctuary. Using random sampling methods, data were gathered from six distinct forest communities. The study identified 271 vascular plants from 208 genera and 74 families. A notable positive correlation (r2 = 0.085, p < 0.05) was observed between total tree density and total tree basal area (TBA), shrub density (r2 = 0.09), tree diversity (D) (r2 = 0.58), shrub diversity (r2 = 0.81), and tree species richness (SR) (r2 = 0.96). Conversely, a negative correlation was found with the concentration of tree dominance (CD) (r2 = 0.43). The Quercus leucotrichophora, Rhododendron arboreum and Quercus floribunda (QL-RA-QF) community(higher altitudinal zone) exhibited the highest tree biomass (568.8 Mg ha−1), while the (Pinus roxburghii and Quercus leucotrichophora) PR-QL (N) community (lower altitudinal zone) in the north aspect showed the lowest (265.7 Mg ha−1). Carbon sequestration was highest in the Quercus leucotrichophora, Quercus floribunda and Rhododendron arboreum (QL-QF-RA) (higher altitudinal zone) community (7.48 Mg ha−1 yr−1) and lowest in the PR-QL (S) (middle altitudinal zone) community in the south aspect (5.5 Mg ha−1 yr−1). The relationships between carbon stock and various functional parameters such as tree density, total basal area of tree and diversity of tree showed significant positive correlations. The findings of the study revealed significant variations in the structural attributes of trees, shrubs and herbs across different forest stands along altitudinal gradients. This current study’s results highlighted the significance of wildlife sanctuaries, which not only aid in wildlife preservation but also provide compelling evidence supporting forest management practices that promote the planting of multiple vegetation layers in landscape restoration as a means to enhance biodiversity and increase resilience to climate change. Further, comprehending the carbon storage mechanisms of these forests will be critical for developing environmental management strategies aimed at alleviating the impacts of climate change in the years to come.

Abies spectabilis (East Himalayan Fir), a dominant timber-producing species in the Himalayas, plays a dynamic role in ecological balance and sustains various habitats across temperate to subalpine altitudes. Himalayan montane forests express signs of changes in the growth, regeneration, and population density of forest tree species due to ongoing climate change, including its upper distribution limit. The research was conducted at 30°11´02˝N and 79°39′36˝E, ranging from 3,100 to 3,500 m asl elevation in the treeline ecotone of western Himalaya. The study presents a comprehensive perspective on how water availability and its intricate interactions with climatic and ecological variables shape the dynamics of treeline ecosystems. The study’s phytosociological analysis of treeline sites revealed the complex interplay between species composition, adaptability, and regeneration potential. The eco-physiological aspects of water balance were thoroughly explored, underscoring how plants employ various strategies to cope with changing water availability. The soil moisture content ranged from 32.17 to 73.50%. The dynamic nature of water potential (pre-dawn (Ψ PD ) and mid-day (Ψ MD )) across seasons and years reflects and varies between −0.13 and − 1.25 MPa, the species’ ability to adjust and manage water balance according to environmental shifts. Osmotic potential at full turgor varied from −0.72 to −1.77 MPa, these adjustments are crucial for key life cycle events of vegetative and reproductive phases of species. The strong correlation of water potential (Ψ) and phenophases emphasizes the importance of water status in regulating these vital processes. Furthermore, the study delved into the maturation and germination processes, highlighting the significance of Ψ and moisture content in seed development and germination success. The maximum germination of 46.33% was observed when the seed moisture content was 30.90 ± 3.11%. The observed correlations between cone characteristics and seed parameters indicate the existence of trade-offs that impact seed size, weight, and germination capacity, contributing to the overall fitness of the species.

In the Himalayan hills, woody plant species form a major source of fuelwood. This practice often leads to degradation of forests and raises several management issues. However, lack of adequate information about use patterns and species-level trends of utilization results in gaps in management planning and interventions. Realizing this, a detailed species-level quantification of annual extraction of fuelwood was conducted in Hat-Kalika watershed that represents west Himalayan conditions in India. Across nine surveyed villages, a total of 30 plants (26 trees, 4 shrubs) were being collected for fuel purpose by the inhabitants. Mean fuelwood collection by households ranged from 2916.4 (kg hh−1 year−1) in high-altitude villages to 1256.6 (kg hh−1 year−1) in low altitude. Among used species, probability of use was maximum for Pinus roxburghii (0.79 high-altitude, 0.89 mid-altitude and 0.82 low-altitude zone). Broadly, the tree species contributed 93.3% (low altitude) to 97.3% (high altitude) of annual fuelwood requirement of households. The quantum of collection was considerably higher from the native species compared to the non-natives. Study brings out the possible management implications of present trends of fuelwood collection in the study watershed in particular and mid-Himalaya watersheds of west Himalaya in general.

Several high-elevation plant species would experience an increased risk of regional extinction due to various climatic and anthropogenic factors. Information about the effects of climate change is urgently needed for modeling vegetation dynamics because it influences the various seed parameters like seed germination, seed maturation, seed mass, and seed bank in the soil. The present study was conducted at an elevation of 3145–3560 m in the treeline area of the western Himalayan region of India. The change in seed color is correlated with other seed parameters such as seed moisture content, seed germination, seed mass, and seed fall density. A decline in moisture content in maturing seeds is closely related to seed maturity ( p < 0.05). Quercus semecarpifolia contains the highest seed mass followed by Abies spectabilis . Reportedly, the species with higher seed mass have an advantage in light-restricted environments for seed germination and seedling development. In addition, the fruit mass was observed to be the highest for Rhododendron campanulatum , while both Betula utilis and R. arboreum had similar fruit mass. The seed fall density varied between 1.55 and 7.85 seeds m –2 and the maximum mortality of up to 32% of seedlings was observed during post-monsoon season from November to February. The potential disruption in the timing of seed fall, soil seed bank, and seed germination due to climatic irregularities has broader implications for forest ecosystems. Generally, the soil in treeline areas gets frozen during winter, resulting in seedlings facing severe water stress and a high rate of transpiration. The present study addresses the issue regarding the survival and proliferation of important treeline species in the western Himalayan region of India.

This is the first book on adaptive aeroservoelasticity and it presents the nonlinear and recursive techniques for adaptively controlling the uncertain aeroelastic dynamics * Covers both linear and nonlinear control methods in a comprehensive manner * Mathematical presentation of adaptive control concepts is rigorous * Several novel applications of adaptive control presented here are not to be found in other literature on the topic * Many realistic design examples are covered, ranging from adaptive flutter suppression of wings to the adaptive control of transonic limit-cycle oscillations

Himalayan forests act as reservoirs of carbon due to their high percentage of forest cover. The biomass values of these forests cluster around two different levels, which dwell between higher values (approximately 400 t/ha for Shorea robusta and Quercus leucotrichophora forests) and lower values (approximately 200 t/ha) for Pinus roxburghii forests. The present study is focused on assessment of variation in tree biomass and carbon sequestration at four sites dominated by chir pine ( P. roxburghii Sarg.) forests located on two different slope aspects. We calculated the tree biomass following allometric equations based upon circumference at breast height by Chaturvedi and Singh (1982). The tree biomass values ranged between 97.87 ± 9.84 t/ha and 158.97 ± 9.39 t/ha; however, tree carbon values ranged between 46.48 ± 4.67 t/ha and 74.66 ± 7.17 t/ha across the study sites. Rates of carbon sequestration ranged between 0.2 ± 0.01 t/ha/yr and 3.96 ± 1.36 t/ha/yr. The rates were higher on slopes of northern aspect in comparison with southern aspect. The results emphasize that the biomass accumulation was higher in the trees located on northern aspects and can be better managed for developing a payment for ecosystem services strategy for following up of REDD+ in the country.