Impacts of vegetation onset time on the net primary productivity in a mountainous island in Pacific Asia

Chang, Chih-Hsiung; Wang, Hsueh-Ching; Huang, Chin Wei

doi:10.1088/1748-9326/8/4/045030

Cited by 31 publications

(26 citation statements)

References 69 publications

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“…There was no apparent temperature anomaly during the observation periods based on nearly two decades of records (1993–2011) acquired from 136 widely distributed meteorological stations. However, consecutive months of severe drought were observed during 2002–2003 (Figure ) [ Chang et al , ].…”

Section: Methodsmentioning

confidence: 99%

Temporal and spatial patterns of remotely sensed litterfall in tropical and subtropical forests of Taiwan

2016

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Litterfall is important for returning nutrients and carbon to the forest floor, and microbes decompose the litterfall to release CO 2 into the atmosphere. Litterfall is a pivotal component in the forest biogeochemical cycle, which is sensitive to climate variability and plant physiology. In this study, we combined field litterfall estimates and time series (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) climate (the Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature (LST) and Tropical Rainfall Measuring Mission (TRMM) precipitations) and green vegetation (MODIS photosynthetically active vegetation cover (PV)) variables to estimate regional annual litterfall in tropical/subtropical forests in Taiwan. We found that time series MODIS LST-and PV-derived metrics, the annual accumulated MODIS LST, and coefficient of variation of PV, respectively, but not the TRMM precipitation variables were salient factors for the estimation (r 2 = 0.548 and p < 0.001). The mean (±standard deviation) annual litterfall was 5.1 ± 1.2 Mg ha À1 yr À1 during the observation period. The temporal dynamics of the litterfall revealed that typhoons and consecutive drought events might affect the litterfall temporal variation. Overall, the annual litterfall decreased along the elevation gradient, which may reflect a change in the vegetation type. The northeast and northwest facing slopes yielded the highest amount of annual litterfall (≥5.9 Mg ha À1 yr À1 ), which was in contrast with the southern aspect (5.1 Mg ha À1 yr À1 ). This variation may be associated with the dryness of the microclimate influenced by solar radiation. This study demonstrates the feasibility of utilizing time series MODIS LST and PV data to predict large-scale field litterfall, which may facilitate large-scale monitoring of biogeochemical cycles in forest ecosystems.

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Section: Methodsmentioning

confidence: 99%

Temporal and spatial patterns of remotely sensed litterfall in tropical and subtropical forests of Taiwan

2016

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“…Meteorological factors have been reported as the key drivers of the change in vegetation cover [34,35] and their lag effects [1,36,37]. We therefore selected annual average temperature, precipitation, and relative humidity of the current year (the year that corresponds to the vegetation cover data) and one year before the vegetation cover investigation year as explanatory factors.…”

Section: Climatic Factorsmentioning

confidence: 99%

Anthropogenic and Biophysical Factors Associated with Vegetation Restoration in Changting, China

Wang

Nizami

et al. 2018

Forests

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Changting has been promoted by the Chinese government as a demonstration for the soil and water conservation works in recent years. As the experience in Changting is now being explored and summarized and will be further promoted to the nation, it is important to understand the factors affecting the vegetation restoration process. Random forest and multiple linear regression approaches were applied to investigate the influential factors and their relative importance on the dynamic change of vegetation coverage of Changting during the period of 2000-2010. The Normalized Difference Vegetation Index (NDVI) was used to calculate Fractional Vegetation Cover (FVC) dynamics in response to topographic, climatic, infrastructure, and economic factors. The results show that overall, there was a dramatic increase in the FVC of Changting from 2000-2010. The percentage of the FVC-increased area reached 87.86% with an increase rate of 0.142. Factors such as precipitation, temperature, elevation, slope and financial investment for soil conservation were important drivers of local FVC change. Our findings reveal that climatic factors along with the strict implementation of government policies played a role in driving vegetation cover dynamics, and the continuation of implementation of soil erosion management in Changting is required.

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“…TIMESAT program is a common tool for phenology detection by setting a threshold value to determine the start of the season and end of the season [30,55,56]. The start of the season was defined as the point at which the EVI increased to a value that was set to 30% of the distance between the minimum and maximum of the left edge.…”

Section: Growing Season Length Detectionmentioning

confidence: 99%

The Greenness of Major Shrublands in China Increased from 2001 to 2013

et al. 2016

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Abstract:Shrubs have been reported to expand into grassland and polar regions in the world, which causes complex changes in ecosystem carbon, nutrients, and resilience. Given the projected global drying trend, shrubs with their superior drought resistance and tolerance may play more important roles in global ecosystem function. Shrubland exists in all of the climate zones in China, from subtropical to temperate and high cold regions, and they occupy more than 20% of the land area. In this paper, we analyzed the spatiotemporal trend of MODIS (Moderate Resolution Imaging Spectroradiometer) EVI (Enhanced Vegetation Index) for six shrubland types in China from 2001 to 2013 and its relationship to intra-and inter-annual regional climate dynamics. Existing literature reported that the vegetation index did not change significantly in China during 2000-2012. However, we found that the shrubland EVI in China increased significantly at a rate of 1.01ˆ10´3 EVI¨a´1 from 2001 to 2013. Two major shrubland types (subtropical evergreen and temperate deciduous) and two desert types (high-cold desert and temperate desert) increased significantly, whereas subalpine evergreen shrubland decreased at a rate of´0.64ˆ10´3 EVI¨a´1. We also detected a significantly lengthened growing season of temperate deciduous shrubland. The growing season length contributed significantly to the annual averaged EVI for temperate deciduous, subalpine deciduous and subtropical evergreen shrublands. Furthermore, the precipitation variation contributed more to the annual averaged EVI than the temperature. The year-round decrease in rainfall and the increase in temperature led to a significant reduction in the subalpine evergreen shrubland EVI. The enhancement of countrywide shrubland EVI may promote its contribution to the regional ecosystem function and its potential to invade grasslands.

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Impacts of vegetation onset time on the net primary productivity in a mountainous island in Pacific Asia

Cited by 31 publications

References 69 publications

Temporal and spatial patterns of remotely sensed litterfall in tropical and subtropical forests of Taiwan

Temporal and spatial patterns of remotely sensed litterfall in tropical and subtropical forests of Taiwan

Anthropogenic and Biophysical Factors Associated with Vegetation Restoration in Changting, China

The Greenness of Major Shrublands in China Increased from 2001 to 2013

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