Transition process of seagrass-seaweed meadows driven by water and material transport from watersheds: Toward quantification and utilization of the ecosystem services

流域水和物质输送驱动的海草-海藻草甸转变过程：生态系统服务的量化和利用

• 批准号: 21H03650
• 负责人: 齋藤 光代
• 金额: $ 11.07万
• 依托单位: Hiroshima University (2022-2023)Okayama University (2021)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21H03650/
• 关键词: 藻場変遷過程; 流域水・物質輸送; 海底湧水; 生物多様性; 生態系サービス

本研究では，多様な生態系サービス機能を有する沿岸藻場の分布や藻場生態系の多様性変遷過程について，特に流域の水・物質輸送の影響に着目し明らかにすることを目的とし，2年目であるR4年度は以下のとおり実施した．(1)河川水・地下水流出にともなう物質輸送量評価：1)流域水・物質輸送評価：①沿岸域に藻場が分布する瀬戸内海の島嶼（広島県生口島）流域を対象に，地下水位などのモニタリングを継続し，②水・物質輸送モデルを適用し流出解析を開始した．2)SGD物質輸送評価：①対象流域沿岸の藻場分布域において，海底湧水（SGD）のトレーサーとなる塩分，水温，ラドン濃度，および栄養塩濃度の海水中の空間分布と季節変化を確認し，潮間帯にSGD観測用ピエゾメーターを設置しモニタリングを行い，②①の結果からSGDおよびSGD由来の栄養塩供給量を推定した．(2)藻場と構成種の空間分布・時間変化の把握：①ドローンを用いて対象流域沿岸の藻場の空撮を実施し，取得した画像データの解析から藻場とその構成種，および活性度の空間分布・時間変化を明らかにし，②現地での踏査調査（海草・海藻類の分布密度，種類，固体サイズの測定）に基づき①の結果検証を行った．また，③高解像度の衛星データを用いた藻場の分布推定を行った．(3)藻場生態系の食物連鎖構造および栄養塩循環の解明：1)食物連鎖構造解析：①対象流域の藻場分布域において地下水および海水，堆積物，海草・海藻類，植物プランクトンの採取を行い，窒素・炭素含有量および安定同位体比の測定を行い，②①の結果に基づき藻場の取り込み窒素源を推定した．2)栄養塩循環評価：①藻場分布域での植物プランクトン現存量と濁度の測定，および堆積物の採取と栄養塩分析を行った．(4)藻場生態系の生物多様性評価：①対象流域の藻場分布域において海水および堆積物を採取し，環境DNAの分析により魚類種の特定を行った．

This study aims to investigate the distribution and diversity of algal ecosystem in coastal areas, and the effects of water and matter transport on algal ecosystem diversity. (1)Evaluation of river water and groundwater outflow and material transportation: 1) Evaluation of river basin water and material transportation: ① Algal field distribution in coastal area, inland sea islands (Guangdao, Shengkou Island) Evaluation of river basin water and material transportation: ① Evaluation of groundwater level in coastal area, ② Evaluation of water and material transportation: ① Evaluation of outflow analysis: ② Evaluation of SGD material transportation: ① In the distribution area of algae farms along the target basin, the spatial distribution and seasonal changes of seabed water inflow (SGD), water temperature, groundwater concentration, and nutrient concentration in the seawater were confirmed. The SGD observation and measurement computer was set up and implemented in the intertidal zone. The results of ②① provide an estimation of SGD and the nutrient supply from which SGD originated. (2)The spatial distribution and temporal variation of algal field and constituent species are grasped: ① The spatial distribution and temporal variation of algal field and constituent species are analyzed and analyzed according to the spatial distribution and temporal variation of algal field and constituent species along the river basin; ② The results of field investigation (distribution density, species and solid content of seaweed and algae) are verified. High resolution satellite images are used to estimate the distribution of algae fields. (3)1) Analysis of food chain structure and nutrient cycle of algal field ecosystem: ① Analysis of food chain structure: ① Selection of algal field distribution domain in target watershed, including groundwater, seawater, sediments, seaweed, algae, and plant species, determination of stable isotope ratio of chlorophyll and carbon content; ② Analysis of food chain structure: ① Estimation of chlorophyll source in algal field selection; 2) Evaluation of nutrient cycle: (1) Determination of plant biomass and turbidity in algae field distribution domain, collection and maintenance analysis of accumulation. (4)Biological diversity assessment of algal field ecosystem: ① sampling of seawater and sediment in algal field distribution domain of watershed, analysis of environmental DNA, specific behavior of fish species.

项目成果

Reproduction of the Marine Debris Distribution in the Seto Inland Sea Immediately after the July 2018 Heavy Rains in Western Japan Using Multidate Landsat-8 Data

• DOI: 10.3390/rs13245048
• 发表时间: 2021-12
• 期刊: Remote. Sens.
• 作者: Shilin Song;Y. Sakuno;N. Taniguchi;H. Iwashita

SPATIAL DISTRIBUTIONS IN GROUNDWATER DISCHARGE ON VARIOUS TIDAL FLATS IN A SMALL AND STEEP ISLAND, WESTERN JAPAN

日本西部小陡岛各滩涂地下水排放空间分布

• DOI: 10.21660/2021.81.6131
• 发表时间: 2021
• 期刊: International Journal of GEOMATE
• 影响因子: 0.7
• 作者: Shingo Nozaki;Shin-ichi Onodera;Yusuke Tomozawa;Mitsuyo Saito
• 通讯作者: Mitsuyo Saito

Long-term Estimation on Phosphorus flux in a Coastal Catchment Influenced by the Anthropogenic Land Use Change

受人为土地利用变化影响的沿海流域磷通量的长期估算

• 发表时间: 2021
• 作者: Kunyang Wang;Shin-ichi Onodera;Mitsuyo Saito;Yuta Shimizu
• 通讯作者: Yuta Shimizu

Effects of Forest Growth in Different Vegetation Communities to Forest Catchment Water Balance

不同植被群落森林生长对森林流域水平衡的影响

• 发表时间: 2021
• 作者: Kunyang Wang;Shin-ichi Onodera;Mitsuyo Saito;Yuta Shimizu;Toru Iwata
• 通讯作者: Toru Iwata

Nitrate dynamics and contamination status in groundwater of agricultural area in Sao Paulo State, Brazil

巴西圣保罗州农区地下水硝酸盐动态及污染状况

• 发表时间: 2021
• 作者: Mitsuyo Saito;Norio Tase;Shin-ichi Onodera;Fernando Saraiva;Rafael Terada;Ricardo Hirata;Edson Cezar Wendland;Yusuke Tomozawa;Anna Rusydi;Masato Fukuoka
• 通讯作者: Masato Fukuoka