Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

[Text] / T. . Kajimoto [et al.] // J. For. Res. - 2007. - Vol. 12, Is. 2. - P103-112, DOI 10.1007/s10310-006-0259-y. - Cited References: 49 . - 10. - ISSN 1341-6979РУБ Forestry

Аннотация: We present results of individual-based root system measurement and analysis applied for Larix gmelinii trees growing on the continuous permafrost region of central Siberia. The data of root excavation taken from the three stands were used for the analyses; young (26 years old), mature (105 years old), and uneven-aged over-mature stand (220 years old). In this article, we highlight two topics: (1) factors affecting spatio-temporal pattern of root system development, and (2) interactions between aboveground (i.e., crown) and belowground (i.e., root) competition. For the first topic, the detailed observation of lateral roots was applied to one sample tree of the overmature stand. The tree constructed a superficial (< 30 cm in depth) and rather asymmetric root system, and each lateral root expanded mainly into elevated mounds rather than depressed troughs. This indicated that spatial development of an individual root system was largely affected by microtopography (i.e., earth hummocks). For these lateral roots, elongation growth curves were reconstructed using annual-ring data, and annual growth rates and patterns were compared among them. The comparison suggested that temporal root system development is associated with differences in carbon allocation among the lateral roots. For the second topic, we examined relationships between individual crown projection area (CA) and horizontal rooting area (RA) for the sample trees of each stand. RA was almost equal to CA in the young stand, while RA was much larger (three or four times) than CA in the mature and overmature stands. Two measures of stand-level space occupation, crown area index (aboveground: CAI; sum of CAs per unit land area) and rooting area index (belowground: RAI; sum of RAs), were estimated in each stand. The estimates of RA1 (1.3-1.8 m(2) m(-2)) exceeded unity in all stands. In contrast, CAI exceeded unity (1.3 m(2) m(-2)) only in the young stand, and was much smaller (< 0.3 m(2) m(-2)) in the two older stands. These between-stand differences in RAI-CAI relationships suggest that intertree competition for both aboveground and belowground spaces occurred in the young stand, but only belowground competition still occurred in the two older stands. Based on this finding, we hypothesized that competition below the ground may become predominant as a stand ages in L. gmelinii forests. Methodological limitations of our analysis are also discussed, especially for the analysis using the two indices of space occupation (CAI, RAI).

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Держатели документа:
Forestry & Forest Prod Res Inst, Kyushu Res Ctr, Kumamoto 8600862, Japan
Ryukoku Univ, Fac Intercultural Commun, Otsu, Shiga, Japan
Forestry & Forest Prod Res Inst, Tsukuba, Ibaraki 305, Japan
Russian Acad Sci, VN Sukachev Inst Forest, Krasnoyarsk, Russia
Kyoto Univ, Fac Agr, Kyoto, Japan
Kyoto Univ, Field Sci Educ & Res Ctr, Kyoto, Japan
Okayama Univ, Grad Sch Environm Sci, Okayama 7008530, Japan

Доп.точки доступа:
Kajimoto, T...; Osawa, A...; Matsuura, Y...; Abaimov, A.P.; Zyryanova, O.A.; Kondo, K...; Tokuchi, N...; Hirobe, M...

/ A. Arzac, M. A. Tabakova, K. Khotcinskaia [et al.] // Dendrochronologia. - 2021. - Vol. 67. - Ст. 125842, DOI 10.1016/j.dendro.2021.125842. - Cited References:75. - This work was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation [project FSRZ-2020-0014; measurements] and the Russian Science Foundation [Grant 18-74-10048; samplings, data analysis, manuscript preparation]. The administrations of the National Park "Shushensky bor" and of experimental plot "Pogorelsky bor" allowed the samplings. A. Rubtsov provided soil water content data. We thank T. Stepina for the English language edition and the editors and anonymous reviewers for their comments and suggestions, which significantly improved the manuscript. . - ISSN 1125-7865. - ISSN 1612-0051РУБ Forestry + Geography, Physical

Аннотация: Climate change affects forest dynamics with potential consequences for essential ecosystem services. The retrospective analysis of secondary growth unveils the effect of climate on forests. However, most tree-ring studies focus on dominant trees, and less is known about the climatic response of their neighbor suppressed trees. We evaluated the influence of tree social status (dominant/suppressed) on climate response in Pinus sylvestris L. trees from two sites with contrasting water availability conditions in the forest-steppe ecotone in southern Siberia. Tree-ring width and intra-annual density fluctuations (IADFs) were used as proxies. Late spring to early summer conditions were the main climate drivers in both tree social status, but the climate response of suppressed trees was stronger and had a longer time window (May-June). IADFs' occurrence was controlled by temperature and its frequency was modulated by local conditions, being more common at the dry site, with tree status just marginally significant. Our results suggest that under the projected warmer and drier climate, suppressed trees in southern Siberia will be prone to increased water shortage, leading to possible higher mortality of more sensitive suppressed trees, with potential consequences for carbon sequestration in the forest-steppe ecosystems in southern Siberia.

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Держатели документа:
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Fed Res Ctr Krasnoyarsk Sci Ctr SB RAS, VN Sukachev Inst Forest SB RAS, Akad Gorodok 50-28, Krasnoyarsk 660036, Russia.
Univ Valladolid, IuFOR EiFAB, Soria, Spain.

Доп.точки доступа:
Arzac, Alberto; Tabakova, Maria A.; Khotcinskaia, Kseniia; Koteneva, Anastasia; Kirdyanov, Alexander V.; Olano, Jose M.; Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0014]; Russian Science FoundationRussian Science Foundation (RSF) [18-74-10048]