Assessment of grassland degradation in alpine meadow using visible vegetation indices by UAV on Qinghai-Tibetan Plateau

2020 ◽  
Author(s):  
Wangya Han ◽  
Xukun Su ◽  
Guohua Liu
Keyword(s):  
Tibetan Plateau ◽  
Alpine Meadow ◽  
Global Climate ◽  
Vegetation Indices ◽  
Grassland Management ◽  
Stepwise Multiple Regression ◽  
Ecological Problem ◽  
Grassland Degradation ◽  
Aerial Vehicle ◽  
The Relationship

<p>Grassland degradation is a global ecological problem, and grassland on the Qinghai-Tibetan Plateau (QTP) is suffering serious and continuous degradation. Due to the vulnerability of grassland ecosystem on the QTP and its sensitivity to global climate change, alpine grassland degradation needs more attention. In this study, we extracted 7 visible vegetation indices by using an unmanned aerial vehicle (UAV) with visible light sensors. We used random forest model and stepwise multiple regression establishing the relationship between visible vegetation indices and filed degradation index to assess alpine meadow degradation. The result showed that ExG (Excess Green Index) was effective in the simulation with an R<sup>2</sup> value of 0.53. The degradation distributions of 50 field sites were obtained at 10cm spatial resolution. This study with visible vegetation indices by UAV provides an effective approach for monitoring grassland degradation at low altitude. The high resolution contributes to more refined grassland management.</p>

scholarly journals The construction of Grassland Degradation Index for Alpine Meadow in Qinghai-Tibetan Plateau

2010 ◽  
Vol 2 ◽  
pp. 1966-1969 ◽  
Author(s):  
L. Wen ◽  
S.K. Dong ◽  
L. Zhu ◽  
X.Y. Li ◽  
J.J. Shi ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Alpine Meadow ◽  
Grassland Degradation ◽  
Degradation Index

scholarly journals Field evidence for earlier leaf-out dates in alpine grassland on the eastern Tibetan Plateau from 1990 to 2006

2014 ◽  
Vol 10 (8) ◽  
pp. 20140291 ◽  
Author(s):  
H. K. Zhou ◽  
B. Q. Yao ◽  
W. X. Xu ◽  
X. Ye ◽  
J. J. Fu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Land Surface ◽  
Alpine Meadow ◽  
Grassland Management ◽  
The Tibetan Plateau ◽  
Spring Phenology ◽  
Ecosystem Responses ◽  
Vegetation Communities ◽  
Alpine Steppe ◽  
Field Evidence

Worldwide, many plant species are experiencing an earlier onset of spring phenophases due to climate warming. Rapid recent temperature increases on the Tibetan Plateau (TP) have triggered changes in the spring phenology of the local vegetation. However, remote sensing studies of the land surface phenology have reached conflicting interpretations about green-up patterns observed on the TP since the mid-1990s. We investigated this issue using field phenological observations from 1990 to 2006, for 11 dominant plants on the TP at the levels of species, families (Gramineae—grasses and Cyperaceae—sedges) and vegetation communities (alpine meadow and alpine steppe). We found a significant trend of earlier leaf-out dates for one species ( Koeleria cristata ). The leaf-out dates of both Gramineae and Cyperaceae had advanced (the latter significantly, starting an average of 9 days later per year than the former), but the correlation between them was significant. The leaf-out dates of both vegetation communities also advanced, but the pattern was only significant in the alpine meadow. This study provides the first field evidence of advancement in spring leaf phenology on the TP and suggests that the phenology of the alpine steppe can differ from that of the alpine meadow. These findings will be useful for understanding ecosystem responses to climate change and for grassland management on the TP.

scholarly journals Grazing intensity on the plant diversity of alpine meadow in the eastern Tibetan plateau

Rangifer ◽  
2004 ◽  
pp. 9-15 ◽  
Author(s):  
Wu Ning ◽  
Liu Jian ◽  
Yan Zhaoli
Keyword(s):  
Community Structure ◽  
Tibetan Plateau ◽  
Plant Diversity ◽  
Alpine Meadow ◽  
Grazing Intensity ◽  
Eastern Tibetan Plateau ◽  
Rangeland Degradation ◽  
Biodiversity Index ◽  
The Relationship ◽  
Kobresia Pygmaea

Because ofthe remoteness and harsh conditions of the high-altitude rangelands on the eastern Tibetan Plateau, the relationship between yak grazing and plant diversity has not been so clear although livestock increase was thought as the main issue leading to the degradation of rangeland. In the debate of rangeland degradation, biodiversity loss has been assumed as one of the indicators in the last two decades. In this paper authors measured the effects of different grazing intensities on the plant diversity and the structure of Kobresia pygmaea community in the case-study area, northwestern Sichuan. The results indicated that plant diversity of alpine meadow has different changing trends respectively with the change of grazing intensity and seasons. In June the highest plant diversity occurred in the intensively grazed (HG) plots, but in July and September species biodiversity index of slightly grazed (LG) plots is higher than other experimental treatments. In August the intermediate grazed (IG) plots has the highest biodiversity index. Moreover, it was found that intensively grazing always leads to the increase of plant density, but meanwhile the decrease of community height, coverage and biomass. Over-grazing can change the community structure and lead to the succession from Kobresia pygmaea dominated community to Poa pratensis dominated. Analyzing results comprehensively, it can be suggested that the relationship between grazing intensity and plant diversity is not linear, i.e. diversity index is not as good as other characteristics of community structure to evaluate rangeland degradation on the high altitude situation. The change of biodiversity is so complicated that it can not be explained with the simple corresponding causality.

HEALTHINESS OF OIL PALM PLANTATION TOWARDS SUSTAINABILITY OF ENVIRONMENT

2020 ◽  
Vol 7 (1) ◽  
pp. 21
Author(s):  
Faradina Marzukhi ◽  
Nur Nadhirah Rusyda Rosnan ◽  
Md Azlin Md Said
Keyword(s):  
Oil Palm ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Satellite Image ◽  
Vegetation Indices ◽  
Soil Nutrient ◽  
Oil Palm Plantation ◽  
Sustainable Environment ◽  
Moisture Analysis ◽  
The Relationship

The aim of this study is to analyse the relationship between vegetation indices of Normalized Difference Vegetation Index (NDVI) and soil nutrient of oil palm plantation at Felcra Nasaruddin Bota in Perak for future sustainable environment. The satellite image was used and processed in the research. By Using NDVI, the vegetation index was obtained which varies from -1 to +1. Then, the soil sample and soil moisture analysis were carried in order to identify the nutrient values of Nitrogen (N), Phosphorus (P) and Potassium (K). A total of seven soil samples were acquired within the oil palm plantation area. A regression model was then made between physical condition of the oil palms and soil nutrients for determining the strength of the relationship. It is hoped that the risk map of oil palm healthiness can be produced for various applications which are related to agricultural plantation.

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