Monitoring of nitrogen compounds on Yakushima Island, a world natural heritage site

Satake, Kenichi; Inoue, Takanobu; Kasasaku, Kinichi; Nagafuchi, Osamu; Nakano, Takanori

doi:10.1016/s0269-7491(98)80022-5

Cited by 11 publications

(8 citation statements)

References 1 publication

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“…Natural World Heritage Sites (NWHSs) represent areas of outstanding universal value from the view of aesthetic importance, geology, ecosystems or biodiversity [1][2][3]. A global consensus has been reached that NWHSs are significant components in global ecosystem protection which is so exceptional as to transcend national boundaries and to be of common importance for present and future generations of all humanity [1].…”

Section: Introductionmentioning

confidence: 99%

Ecological Environment Assessment in World Natural Heritage Site Based on Remote-Sensing Data. A Case Study from the Bayinbuluke

et al. 2019

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Ecological environment assessment would be helpful for a rapid and systematic understanding of ecological status and would contribute to formulate appropriate strategies for the sustainability of heritage sites. A procedure based on spatial principle component analysis was employed to measure the ecological status in Bayinbuluke; exploratory spatial data analysis and geo-detector model were introduced to assess the spatio-temporal distribution characteristics and detect the driving factors of the ecological environment. Five results are presented: (1) During 2007–2018, the average values of moisture, greenness, and heat increased by 51.72%, 23.10%, and 4.99% respectively, and the average values of dryness decreased by 56.70%. However, the fluctuation of each indicator increased. (2) The ecological environment of Bayinbuluke was improved from 2007 to 2018, and presented a distribution pattern that the heritage site was better than the buffer zone, and the southeast area was better than the northwest area. (3) The ecological environment presented a significant spatial clustering characteristic, and four types of spatial associations were proposed for assessing spatial dependence among the samples. (4) Elevation, protection partition, temperature, river, road, tourism, precipitation, community resident, and slope were statistically significant with respect to the changes in ecological status, and the interaction of any two factors was higher than the effect of one factor alone. (5) The remote-sensing ecological index (RSEI) could reflect the vegetation growth to a certain extent, but has limited ability to respond to species structure. Overall, the framework presented in this paper realized a visual and measurable approach for a detailed monitoring of the ecological environment and provided valuable information for the protection and management of heritage sites.

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Section: Introductionmentioning

confidence: 99%

Ecological Environment Assessment in World Natural Heritage Site Based on Remote-Sensing Data. A Case Study from the Bayinbuluke

et al. 2019

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“…However, most of the base cations for plant nutrition in Yakushima Island appear to be derived from sea salt and the forest trees feed nearly exclusively on cations of atmospheric origin (Kennedy et al 2002;Nakano et al 2001b). In addition, the major source of N compounds entering the ecosystem is atmospheric deposition (Satake et al 1998). Therefore, deposited nutrient salts and nitrogen compounds are important resources for plant growth in Yakushima Island.…”

Section: Physiological Degradation Of Needlesmentioning

confidence: 99%

Environmental factors influencing the load of long‐range transported air pollutants on Pinus amamiana in Yakushima Island, Japan

Kume¹,

Nagafuchi²,

Suguru³

et al. 2009

Ecological Research

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With the industrialization in East Asia, greater amounts of ozone and acidic aerosols are transported to Japan. Yakushima Island (30°20¢N, 130°31¢E) is affected directly by long-range transboundary air pollution from the continent because there are no industrial areas and sources of pollution between the continent and the island. Recently, there has been a significant decline of Pinus amamiana in the island and the actual condition of air pollution was investigated. A significant amount of air pollutants were detected in winter. The daily mean tropospheric O 3 concentration was nearly 100 ppb in winter. A large amount of non-sea salt sulfate (nss-SO 4 2À ) was deposited on the needle surfaces in the northwest part of the island and dry deposition rates of SO 4 2À were remarkably higher in February than in November. About half of the increase in SO 4 2À was nss-SO 4 2À and the rate in February was over four to five times as high as that in November. The load of dry deposition on the crown of trees was strongly influenced by the topographic position of the slope. The amount of deposited SO 4 2À was larger on trees growing on ridges and the tendency of P. amamiana to grow on ridges where it sticks out over 20 m enhances the load of dry deposition and O 3 on the needle surfaces. The potassium leakage and ethylene emission from needles were remarkably increased and the needle mass per area decreased from November to February. It was suggested that the additional input of nss-SO 4 2À acidifies the needle surface and accelerates leaf surface deterioration and leaching from needles and soils.

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“…Moreover, the low concentrations of these ions in the river water, relative to those in precipitation, are due to uptake and storage by forest microorganisms and plants and soil absorption (Berner and Berner 1987;Satake et al 1998). Although nutrient inflow to streams increases after deforestation (Bernhardt et al 2003), more than 80% of Iriomote Island is covered by forest and less than 4% is used for human activities (Table 1).…”

Section: Origin Of Nutrientsmentioning

confidence: 99%

Chemistry of the Urauchi River Water in Iriomote Island National Park, Okinawa, Japan

Ishiki

Sakihama

Agata³

et al. 2008

Water Air Soil Pollut

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The chemical characteristics of the Urauchi River water in Iriomote Island National park, Okinawa, Japan have been studied. Concentrations of PO 4 3− , NO 2 − , and NH 4 + were barely detectable. We compared the concentration ratios of Mg 2+ /Na + , HCO 3 − /Na + , and Ca 2+ /Na + in the Urauchi River to those of 60 large rivers in the world and indicated that the chemical composition of the river is most likely formed by the binary mixing of sea salt components and silicate rock weathering components. Although rock weathering in the catchments area is driven by both H 2 CO 3 and H 2 SO 4 , the role of H 2 CO 3 is dominant. The percentages of the concentration of each cation in the river water are almost the same as those of other rivers with drainage areas consisting of silicate rock and sandstone. Thus, the Urauchi River shows the typical chemical characteristics of a river in a silicate rock area that includes sandstone.

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Monitoring of nitrogen compounds on Yakushima Island, a world natural heritage site

Cited by 11 publications

References 1 publication

Ecological Environment Assessment in World Natural Heritage Site Based on Remote-Sensing Data. A Case Study from the Bayinbuluke

Ecological Environment Assessment in World Natural Heritage Site Based on Remote-Sensing Data. A Case Study from the Bayinbuluke

Environmental factors influencing the load of long‐range transported air pollutants on Pinus amamiana in Yakushima Island, Japan

Chemistry of the Urauchi River Water in Iriomote Island National Park, Okinawa, Japan

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