The Western Himalayan fir tree ring record of soil moisture in Pakistan since 1855

Rauf, Zahid; Zarif, Nowsherwan; Khan, Ali Haider; Siddiqui, Samina; Fatima, Seerat; Iqbal, Wahiba; Amin, Hira; Iqbal, Tahir; Arif, Muhammad; Sattar, Shehla; Rauf, Muhammad

doi:10.1007/s00484-023-02517-0

Cited by 8 publications

(3 citation statements)

References 62 publications

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“…Topographic features influence ecosystem shape, biodiversity, and EIs. Natural and human-induced topography changes profoundly affect the environment (Rauf et al, 2023). Changing physical structures, changes in elevation or slope, or changes in soil composition may impact water flow patterns, soil composition, and the microclimate.…”

Section: Changing Topographical Features and Ecological Indicatorsmentioning

confidence: 99%

Effects of changing riparian topography on the decline of ecological indicators along the drawdown zones of long rivers in China

Arif,

Petrosillo,

Changxiao

2024

Front. For. Glob. Change

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Riparian topographical features can drive a suite of ecological indicators (EIs) that shape the river ecosystem. The mechanisms that EIs reflect provide several ecosystem services. We know little about the responses of EIs (indicators of plant cover, regeneration, exotics, habitat, erosion, and stressors) to the changing stream-channel width, riparian width, and elevation of the lengthy drawdown zones (upstream, midstream, and downstream) of long rivers. We have discovered that changing topographical characteristics affect riparian buffer areas differently by using a rapid field-based method with 297 transects in inundated regions along the Yangtze River and other 36 linked tributaries in China. Changing stream-channel widths was most effective on downstream EIs and the least effective at midstream. The exotic parameters were the most affected (with a range of −0.36 < r < 0.401) by stream-channel widths, as determined using Pearson correlation (p < 0.05). In contrast, the changing riparian width had the uppermost impact on the upstream EIs and the lowermost impact downstream; riparian width had the most significant impact on habitat parameters (with r ≤ 0.787). The elevation followed the riparian width pattern and was negatively associated with habitat and exotics (r ≤ −0.645 and r ≤ −0.594) and positively correlated with regeneration (r ≤ 0.569). These results reaffirm the imperative need for studies on regionally dependent riparian areas maintained under the same management strategies regardless of their topographical features. Future policies should be formulated to enhance ecosystem service provision, promoting the sustainable use of extensive river ecosystems while considering EIs. Additionally, these future policies should acknowledge drawdown zone factors within the same river network. Furthermore, additional measures are imperative to conserve topographical features and prevent further destruction.

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Section: Changing Topographical Features and Ecological Indicatorsmentioning

confidence: 99%

Effects of changing riparian topography on the decline of ecological indicators along the drawdown zones of long rivers in China

Arif,

Petrosillo,

Changxiao

2024

Front. For. Glob. Change

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“…The ZZA, ZZB and ZZC chronologies are 114 (1902-2022), ZZB 232 (1791-2022), and ZZC 247 (1776-2022) years long, respectively, with the sub-sample signal strength (SSS) greater than 0.85 taken as the starting year (Table 2 and Figure 2) [49][50] . The three elevation-standard chronologies have valid public time periods of 1910-2022.…”

Section: Chronological Statistical Characteristicsmentioning

confidence: 99%

Radial growth response of Pinus sylvestris var. mongolica to drought at different elevations in northern Daxing'anling and reconstruction of the SPEI sequence

zhang,

Wang,

Zhang

et al. 2024

Preprint

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In order to study the historical wet and dry changes in the northern Daxing'anling region of China, this paper established a standard chronology of tree-ring width at high (1150 m), medium (800–900 m), and low (700 m) elevations. The analysis was based on tree-ring cores of Pinus sylvestris var. mongolica from three elevation gradients in the northern Daxing'anling and correlates it with the SPEI (Standardized precipitation evapotranspiration index) of 12-month time scale. The established widths were correlated with the SPEI at a 12-month time scale. Climate-growth correlation analysis revealed that the low elevation chronology exhibited the highest correlation with the SPEI index in July–August (r = 0.665, p < 0.01). Based on this, a linear regression model between the low elevation tree-ring width chronology and the July–August SPEI index was established via regression analysis to reconstruct the dry and wet changes in the study area in the past 210 years. The explained variance (R2) of the reconstructed equation was 44.3%, (the explained variance after adjusting for degrees of freedom was 43.3%), and the F-value was 45.295.The reconstruction satisfied required statistical calibration and validation tests. The inter-annual variations indicate that the study area experienced six wet periods (1809–1818, 1828–1837, 1848–1864, 1928–1948, 1950–1972 and 1996–2003) and six dry periods (1819–1827, 1838–1847, 1865–1904, 1906–1923, 1973–1988 and 2004–2018), with an equal share of wet and dry years (13.8% and 14.8%). The reconstruction results are confirmed by the historical data and the reconstruction results of the surrounding region of the study area. Wavelet analysis reveals oscillatory cycles of 18, 26–29, and 40 years in the reconstructed sequence, which may be related to the North Atlantic Sea Surface Temperature Multi-Year Intergenerational Oscillation (AMO) and the North Atlantic Oscillation (NAO).

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“…This study has direct implications for R. platypodum conservation. The survival of the species depends on a multifaceted approach (Tsukamoto et al, 2021;Liu et al, 2022;Abbasi et al, 2023;Cao et al, 2023;Rauf et al, 2023;Naz et al, 2024): (Chen et al, 2022) Restoration efforts should aim to improve the quality and connectivity of habitats to facilitate healthy populations and gene flow (Torres-Díaz et al, 2021). R. platypodum is a valuable species in the ecosystem, and conservation efforts can be bolstered by raising awareness of its importance and role within it (Harrington et al, 2023).…”

Section: Recommendations On Rhododendron Platypodum Protectionmentioning

confidence: 99%

Genetic variability and population divergence of Rhododendron platypodum Diels in China in the context of conservation

Ma,

Li,

Fang

et al. 2024

Front. For. Glob. Change

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Genetic diversity in endangered species is of special significance in the face of escalating global climate change and alarming biodiversity declines. Rhododendron platypodum Diels, an endangered species endemic to China, is distinguished by its restricted geographical range. This study aimed to explore genetic diversity and differentiation among its populations, gathering samples from all four distribution sites: Jinfo Mountain (JFM), Zhaoyun Mountain (ZYM), Baima Mountain (BMM), and Mao’er Mountain (MEM). We employed 18 pairs of Simple Sequence Repeat (SSR) primers to ascertain the genetic diversity and structural characteristics of these samples and further utilized 19 phenotypic data points to corroborate the differentiation observed among the populations. These primers detected 52 alleles, with the average number of observed alleles (Na) being 2.89, the average number of effective alleles (Ne) being 2.12, the average observed heterozygosity (Ho) being 0.57, and the expected heterozygosity (He) being 0.50. This array of data demonstrates the efficacy of the primers in reflecting R. platypodum’s genetic diversity. SSR-based genetic analysis of the populations yielded Ho, He, and Shannon index (I) values ranging from 0.47 to 0.65, 0.36 to 0.46, and 0.53 to 0.69, respectively. Notably, the ZYM population emerged as the most genetically diverse. Further analysis, incorporating molecular variance, principal component analysis, UPGMA cluster analysis, and structure analysis, highlighted significant genetic differentiation between the Chongqing (BMM, JFM, ZYM) and Guangxi (MEM) populations. Morphological data analysis corroborated these findings. Additionally, marked genetic and morphological distinctions were evident among the three Chongqing populations (BMM, JFM, and ZYM). This suggests that, despite the observed regional differentiation, R. platypodum’s overall genetic diversity is relatively constrained compared to other species within the Rhododendron genus. Consequently, R. platypodum conservation hinges critically on preserving its genetic diversity and protecting its distinct populations.

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The Western Himalayan fir tree ring record of soil moisture in Pakistan since 1855

Cited by 8 publications

References 62 publications

Effects of changing riparian topography on the decline of ecological indicators along the drawdown zones of long rivers in China

Effects of changing riparian topography on the decline of ecological indicators along the drawdown zones of long rivers in China

Radial growth response of Pinus sylvestris var. mongolica to drought at different elevations in northern Daxing'anling and reconstruction of the SPEI sequence

Genetic variability and population divergence of Rhododendron platypodum Diels in China in the context of conservation

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