J. Jpn. Soc. Soil Phys.
土壌の物理性No. 152, p.57 ∼ 59 (2022)

日本地球惑星科学連合 (JpGU) 2022 年大会

A-HW24 Material transportation and cycling at the land-sea
interface: from headwaters to the ocean 開催報告
小林政広 1Masahiro KOBAYASHI1

1. はじめにションの企画 · 運営に参画している）
共催学会：日本海洋学会, 日本水文科学会, 水文 · 水資源

日本地球惑星科学連合（JpGU）
2022 年大会は，米国地球物理学連合（AGU）とのジョイント大会「JpGU-AGU Joint

学会, 日本堆積学会, 日本第四紀学会, 日本地下水学会, 土壌物理学会

Meeting 2022」として開催された．本大会は新型コロナウイルス感染症の影響により現地とオンラインでのハ2. プログラムと講演内容

イブリッド開催となった．本稿では本大会で企画されたセッション A-HW24「Material transportation and cycling

本大会では口頭 24，ポスター 20 の合計 44 タイトルat the land-sea interface: from headwaters to the ocean（流の発表があった（Table 1）．源流域，河川，地下水，湖域圏生態系における物質輸送と循環：源流から沿岸海

沼，沿岸海域を研究フィールドとした研究が揃い，窒素域まで）」の開催概要について報告する．本セッションやリンをはじめとする物質の流入と流出，移動過程におは，2021 年大会で開催された「Materials transport andける形態変化，それをコントロールする微生物の作用ま

nutrient cycles in watersheds; from headwaters to coastalseas（流域の物質輸送と栄養塩循環 — 源流域から沿岸海域まで —）」の後継企画である．従来通り，源流域から沿岸海における水 · 物質輸送および栄養塩循環のプロセで，マクロからミクロの幅広いアプローチに分野を超えスとメカニズムの理解を軸に据え，幅広い議論を行うこドで行うこととしたが，ポスター発表を口頭発表と同一とを目指した．今回も英語セッションとした．セッショ

日に現地で行った発表者が少なく，オンライン発表日がン概要については以下の大会 WEB サイトも参照された

約一週間後となったため，セッションの一体感という点

い．

では課題が残った．

https://www.jpgu.org/meeting j2022/sessionlist jp/detail/A-HW24.htmlて触れることができる機会となった．気候変動が生物多様性に及ぼす影響や，COVID-19 の影響を扱う研究も見られた．本セッションは現地とオンラインのハイブリッ

3. おわりに源流域から沿岸域までの水と物質の輸送 · 循環におけコンビーナ：安元 純（代表）（琉球大），小林政広（森林る物理，化学，生物プロセスを一体的に理解することを研究 · 整備機構），奥田 昇（神戸大），Adina Paytan（カ目指す本セッションは，前身となる 2003 年開催セッショ

リフォルニア大）ン「山地流域の水文地質と物質循環」から数えて 20 回

準コンビーナ：知北和久（北大），入野智久（北大），齋藤目の開催となった．2023 年大会では代表コンビーナを光代（広島大学），小野寺真一（広島大学），伴 修平（滋賀熊本大学の細野高啓氏が務め，引き続き開催する．土壌県立大），細野高啓（熊本大），前田守弘（岡山大）（登録

物理学会会員諸氏の参加を歓迎する．

可能なコンビーナ数は 4 名であるが準コンビーナもセッ
1 Forestry and Forest Products Research Institute, Forest Research andManagement Organization, 1 Matsunosato,Tsukuba, Ibaraki 305-8687,
Japan. Corresponding author: 小林政広, 森林研究 · 整備機構森林総合研究所

土壌の物理性58

第 152 号

(2022)

Table 1 発表タイトル一覧．
List of the presentation titles.
発表者

発表タイトルORAL SESSION
Okuda

Climate impacts on benthic biodiversity in a deep ancient Lake BiwaKobayashi

Spatial variation in methane oxidizing bacterial communities in the bottom boundary layer of Lake Biwa underwarming

Fujibayashi

Spatial pattern of methanotrophic food webs in Lake Biwa under changing climatesdela Paz

Nitrogen subsidy from profundal methane-oxidizing bacteria cascades across pelagic food web in a deep mesooligotrophic reservoir

PobleteSouthern urban hydrosystem syndrome in Marikina watershed revealed by taxonomic and functional diversity ofbenthic macroinvertebrates”

Saito

Effect of seagrass-seaweed bed dynamics on carbon and nitrogen cycles on a tidal ﬂat scale

IguchiResearch for setting local environmental thresholds that contribute to coral reef conservation in the era of high CO2Yasumoto

The terrestrial impact evoked by the land-originated phosphate adhering to coastal calcareous sediments on coral
reef ecosystem in Sekisei Lagoo

Yasumoto

Estimation of the terrestrial phosphate loading by integrated hydrological modelling for evaluation of phosphorus
accumulated in calcareous sediments

ShinjoLINKAGE project: Adaptive governance of multiple resources based on land-sea linkages of the water cycle at coral
reef islandsKawashima

Conservation of coastal ecosystem and coral reef with the management of settling basin: The usefulness and its
economic assessment

HiroseSediment yield and sedimentation rate at several settling basins in the northern part of Okinawa Island

Kato

Impact of groundwater in the Kanogawa riverine system

Mori

Impact of the groundwater in the Kanogawa riverine system: Numerical modeling bridging hydrogeological andecological systems from the headwaters to the estuary of the Kanogawa River

OnoderaNitrogen and phosphorus ratios in various groundwater in Japanese agricultural areas

Kimbi

Variation of water balance components in the Kurose river basin between the 1980s and 2000s using SWAT

Wang

Long-term Phosphorus balance changes inﬂuenced by anthropologic factors in Yamato river catchment

Nang

Estimation of soil erosion under major land covers of Inle lake watershed in Shan state, Myanmar

Kobayashi

Evaluation of water and solute ﬂux in a forest soil

ImamuraSimulation of suspended sediment yields in forested headwatershed at Ibaraki prefecture by using SWAT

AndoRelationship between transportation and palynofacies/palynomorph assemblage of suspended sediments in therivers around Lake Shinji and Nakaumi Lagoon

PereraIron oxides and biochar incorporation into sediment to reduce phosphorus release

Peng

Estimation of freshwater discharge from the Gulf of Alaska drainage basinsRahman

Episymbiotic infection on cyclopoid copepods during the stagnation period of 2020–2021 in Lake Biwa, Japan日本地球惑星科学連合 (JpGU)2022 年大会 A-HW24 開催報告

59

Table 1 発表タイトル一覧（続き）．
List of the presentation titles.
発表者

発表タイトルPOSTER SESSION
Maruyama

Shotgun metagenomic analysis on the groundwater microbial communities and creening of the functional genes
related to the nitrogen cycling in Ryukyu Limestone area

Hermawan

Identiﬁcation of the occurrence of denitriﬁcation in the Ryukyu limestone aquifer in southern Okinawa

Maruyama

Development of a method to reconstruct past winter monsoon variability based on the inter-annual variabilities ofriver discharges and snowfall in Hokkaido, northern Japan

IshidaSources and dynamics of phosphorus in the sediments of Lake Biwa using phosphate oxygen isotope analysis

Kimbi

Evaluation of sources and fate of nitrate in the agricultural island of Osakishimojima (Seto inland sea, Japan) usingnitrogen isotope

Wang

Does weekly data could ﬁll the bridge between daily and monthly data in modeling work

Nang

Estimation of suspended sediment discharge in Takahashi river using Soil and Water Assessment Tool

Song

Pollution sources of groundwater contamination diagnosed by boron isotope composition in Okinawa, Yoron, andTarama Islands, southern Japan

IijimaEffects of the pumice pebbles on the survival rate of juvenile corals especially focusing on pH and concentrations ofmetal ions dissolved into seawater

Akinaga

Evaluation of the spatial distribution of seagrass-seaweed beds including different species in shallow coastal waters
using UAV

NguyenIsland-scale spatial variation in the coastal environmental factors: Case study in the Seto Inland Sea, western Japan

TamuraComparison and origin estimation of groundwater dissolved phosphorus in coastal agricultural waters

Saito

Seasonal variation in groundwater quality and greenhouse gas in agricultural areas

Tomozawa

Unconﬁned groundwater ﬂow around saltwater — freshwater interface in a small granitic island

TomoyaQuantitative evaluation of water and nutrient discharge by a hydrological model in the sub-catchments of Osaka Bay

ItohHow COVID-19 pandemic affected air pollutants inﬂux into forest ecosystems in JapanHorisawa

Impacts on forest soil microbial ecosystems due to reduced declining activity in response to the spread of COVID-19

Xin

Different responses between copepod and cladoceran zooplankton to their growth and production by weathermediated disturbance in Lake Biwa, Japan

Guyo

Estimation of spatial variation of groundwater recharge rate in Asahi River catchment, western Japan using SWAT

ItaiHypolimnetic oxygen depletion rate of 8 Japanese mesotrophic lakes in 2021