The spatial dynamics of vegetation revealed by unmanned aerial vehicles images in a straw-checkerboards-based ecological restoration area

Yanning, 邱燕宁 Qiu; Shiyu, 任世钰 Ren; Xin, 王鑫 Wang; Penghao, 杨鹏浩 Yang; Yuanyuan, 李媛媛 Li; Shihan, 李世寒 Li; Xilin, 伍锡林 Wu; Shuhan, 吴书翰 Wu; Zhiwei, 徐志伟 Xu; Guoqi, 李国旗 Li; Cheng, 黄成 Huang; Xu, 徐驰

doi:10.5846/stxb201810172245

Cited by 2 publications

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“…The value of the index tends to -1, which indicates that the degree of negative spatial correlation is higher, and the difference between adjacent units is generally larger. The value of Moran's I index close to 0 indicates that the overall spatial autocorrelation degree is low (Qiu et al, 2019).…”

Section: Spatial Autocorrelation Detection At Different Scalesmentioning

confidence: 99%

The Relative Importance of Niche Process and Neutral Process in the Community Assembly of Subtropical Karst Forest: A Perspective on the Changes of Species Distribution Patterns at Different Scales

Jiang

Lin

et al. 2021

Preprint

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Background and aimsThe importance of niche processes and neutral processes to community assembly has been affirmed by most studies, although their relative importance needs to be determined in many systems. Moreover, as the spatial scale changes, the ecological processes that determine the community pattern may differ. We tested these ideas in subtropical karst forest in southwestern China in order to aid efforts of community reconstruction.MethodsTo test the importance of niche-based and neutral mechanisms we compared the fit six models to the observed SAD of the plot at three different sampling scales (10 m × 10 m, 20 m × 20 m, 50 m × 50 m). We also used spatial autocorrelation and distance-based Moran's eigenvector maps (dbMEM) combined with variation partitioning to further determine the relative contribution of the niche process and the neutral process under different sampling scales.ResultsThe neutral theoretical and statistical models fit the observed species abundance distribution curve best at each sampling scale. And variation partitioning showed that although the contribution of spatial structure was lower at larger sampling scales, it was still important, suggesting that neutral processes drive community structure at all sampling scales. In contrast, habitat filtering and interspecies competition may lead to a net weakening of the contribution of the niche process to the species abundance pattern of the community because they act in opposite directions. ConclusionsIn the restoration and reconstruction of local karst forest communities, environmental heterogeneity, inter-species relationships, and geographic spatial differences should all be considered.

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Section: Spatial Autocorrelation Detection At Different Scalesmentioning

confidence: 99%

The Relative Importance of Niche Process and Neutral Process in the Community Assembly of Subtropical Karst Forest: A Perspective on the Changes of Species Distribution Patterns at Different Scales

Jiang

Lin

et al. 2021

Preprint

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Spatio-temporal variation in snow cover area and its fragmentation in Northeast China

Gu,

Ma,

Zhang

et al. 2024

Front. Earth Sci.

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Under the backdrop of climate warming and changes in snow cover area, the spatial fragmentation characteristics of snow cover need to be studied in depth. In this study, we analyzed the spatial and temporal change patterns of the snow cover area and explored the changing characteristics of its spatial fragmentation in Northeast China from 1980 to 2019 using the “China AVHRR Daily Cloudless 5 km Snow Area Product Dataset.” The findings indicate that the mean stable snow cover area in Northeast China from 1980 to 2019 was 79.41 × 104 km2 (±14.47 × 104 km2), with no significant changes observed since the 1980s. However, compared to the 1980s, mountainous areas such as the Changbai Mountain and Lesser Khingan Mountain regions were identified as the main areas of snow cover recession. The mean patch size (MPS), largest pach index (LPI) and patch size coefficient of variation (PSCV) for spatial fragmentation from 1980 to 2019 showed the following rates of change of −1.06 × 104 km2/10 a (p < 0.05), −1.04%/10 a (p > 0.05), and 71.6%/10 a (p < 0.05), respectively. The spatial continuity of snow fragmentation in Northeast China has significantly increased, with fragmentation showing significant growth. From 2010 to 2019, the spatial fragmentation of snow cover in Northeast China increased by 50% compared to the 1980–1989 period. This paper suggests that the increase in temperature is the major factor leading to the fragmentation of snow cover. The main contribution of this paper is the analysis of the change characteristics of the spatial fragmentation in regional snow cover.

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The spatial dynamics of vegetation revealed by unmanned aerial vehicles images in a straw-checkerboards-based ecological restoration area

Cited by 2 publications

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The Relative Importance of Niche Process and Neutral Process in the Community Assembly of Subtropical Karst Forest: A Perspective on the Changes of Species Distribution Patterns at Different Scales

The Relative Importance of Niche Process and Neutral Process in the Community Assembly of Subtropical Karst Forest: A Perspective on the Changes of Species Distribution Patterns at Different Scales

Spatio-temporal variation in snow cover area and its fragmentation in Northeast China

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