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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">hydrophysics</journal-id><journal-title-group><journal-title xml:lang="ru">Фундаментальная и прикладная гидрофизика</journal-title><trans-title-group xml:lang="en"><trans-title>Fundamental and Applied Hydrophysics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2073-6673</issn><issn pub-type="epub">2782-5221</issn><publisher><publisher-name>St. Petersburg Research Center of the Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.7868/S2073667321040079</article-id><article-id custom-type="elpub" pub-id-type="custom">hydrophysics-134</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>HYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSES</subject></subj-group></article-categories><title-group><article-title>Внешняя и внутренняя фосфорная нагрузка на крупный трансграничный водоем в условиях минимальной проточности</article-title><trans-title-group xml:lang="en"><trans-title>External and internal phosphorus loading to a large transboundary water body under low flow conditions</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кондратьев</surname><given-names>С. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Kondratyev</surname><given-names>S. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196105, ул. Севастьянова, 9, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196105, Sevastyanova Str., 9, St. Petersburg</p></bio><email xlink:type="simple">kondratyev@limno.org.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Брюханов</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Briukhanov</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196625, Фильтровское шоссе, 3, пос. Тярлево, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196625, Filtrovskoje Shosse, 3, p.o. Tiarlevo, St. Petersburg</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Игнатьева</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Ignatyeva</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196105, ул. Севастьянова, 9, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196105, Sevastyanova Str., 9, St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шмакова</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Shmakova</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196105, ул. Севастьянова, 9, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196105, Sevastyanova Str., 9, St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Обломкова</surname><given-names>Н. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Oblomkova</surname><given-names>N. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196625, Фильтровское шоссе, 3, пос. Тярлево, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196625, Filtrovskoje Shosse, 3, p.o. Tiarlevo, St. Petersburg</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коробченкова</surname><given-names>К. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Korobchenkova</surname><given-names>K. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>196105, ул. Севастьянова, 9, г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>196105, Sevastyanova Str., 9, St. Petersburg</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт озероведения РАН — СПб ФИЦ РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Limnology, Russian Academy of Sciences — SPb FRC RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт агроинженерных и экологических проблем сельскохозяйственного производства — филиал ФГБНУ ФНАЦ ВИМ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute for Engineering and Environmental Problems in Agricultural Production — Branch of FSAC VIM</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>14</day><month>12</month><year>2021</year></pub-date><volume>14</volume><issue>4</issue><fpage>77</fpage><lpage>89</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кондратьев С.А., Брюханов А.Ю., Игнатьева Н.В., Шмакова М.В., Обломкова Н.С., Коробченкова К.Д., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Кондратьев С.А., Брюханов А.Ю., Игнатьева Н.В., Шмакова М.В., Обломкова Н.С., Коробченкова К.Д.</copyright-holder><copyright-holder xml:lang="en">Kondratyev S.A., Briukhanov A.Y., Ignatyeva N.V., Shmakova M.V., Oblomkova N.S., Korobchenkova K.D.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://hydrophysics.spbrc.ru/jour/article/view/134">https://hydrophysics.spbrc.ru/jour/article/view/134</self-uri><abstract><p>Представлены результаты оценки фосфорной нагрузки на крупнейший европейский трансграничный водоем — Чудско-Псковское озеро в условиях минимальной проточности, характерной для маловодного периода 2010–2015 гг. Расчет внешней фосфорной нагрузки выполнен с использованием модели формирования биогенной нагрузки ILLM (Institute of Limnology Load Model), разработанной в Институте озероведения РАН и учитывающей вклад точечных и рассредоточенных источников. Вынос с сельскохозяйственных полей определялся исходя из содержания Робщ в пахотном слое почвы, дозы внесения минеральных и органических удобрений на поля и их усвоения сельхозкультурами. Для оценки современных значений площадей различных типов подстилающей поверхности, являющихся входными данными для моделирования, применялись данные космической съемки, находящиеся в режиме свободного доступа. Расчет внутренней фосфорной нагрузки на озерную экосистему за счет вторичного поступления фосфора из донных отложений выполнен с привлечением данных натурных наблюдений на акватории. Использована методика, разработанная в Институте озероведения РАН и основанная на балансовых оценках основных потоков фосфора (седиментации, захоронения и поступления из донных отложений в воду) в пограничной зоне «вода–дно». Показано, что в условиях рассмотренного маловодного периода внутренняя фосфорная нагрузка превосходит внешнюю, что негативно сказывается на эвтрофировании озера.</p></abstract><trans-abstract xml:lang="en"><p>The article presents the results of the assessment of the phosphorus load on the largest European transboundary water body — Lake Chudsko-Pskovskoye under the conditions of the minimum flow rate typical for the dry period of 2010–2015. The external phosphorus load was calculated using the nutrient load model ILLM (Institute of Limnology Load Model) developed at the Institute of Limnology of the Russian Academy of Sciences and taking into account the contribution of point and non-point sources. Phosphorous losses from agricultural fields were determined based on the Ptot content in the arable soil layer, application rates of mineral and organic fertilisers, and nutrient uptake by crops. Free-access satellite imagery data was used to estimate the current areas of various types of land cover, which were the input data for modeling. The internal phosphorus load on the lake ecosystem due to the secondary phosphorus release from bottom sediments was calculated by the data from field observations in the water area. The study applied the methodology developed at the Institute of Limnology RAS and based on balance estimates of the main fluxes of phosphorus, such as sedimentation, burial, and release into the water from bottom sediments, in the “water–bottom” boundary zone. The study demonstrated that under the conditions of the considered low-water period, the internal phosphorus load exceeded the external one, having an adverse effect on the lake eutrophication.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>озеро</kwd><kwd>водосбор</kwd><kwd>донные отложения</kwd><kwd>биогенные элементы</kwd><kwd>внешняя и внутренняя нагрузка</kwd><kwd>эвтрофирование</kwd></kwd-group><kwd-group xml:lang="en"><kwd>lake</kwd><kwd>catchment</kwd><kwd>bottom sediments</kwd><kwd>nutrient</kwd><kwd>external load</kwd><kwd>internal load</kwd><kwd>eutrophication</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The research was funded by the study № 0154–2019–0001 of the State research plan for the IL RAS.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Кондратьев С.А., Голосов С.Д., Зверев И.С., Рябченко В.А., Дворников А.Ю. 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