Different responses of Korean pine (Pinus koraiensis) and Mongolia oak (Quercus mongolica) growth to recent climate warming in northeast China

Korean pine (Pinus koraiensis Sieb. et Zucc.) is one of the highly commercial woody species in Northeast China. In this study, six nonlinear equations and artificial neural network (ANN) models were employed to model and validate height-diameter (H-DBH) relationship in three different stand densities of one Korean pine plantation. Data were collected in 12 plots in a 43-year-old even-aged stand of P. koraiensis in Mengjiagang Forest Farm, China. The data were randomly split into two datasets for model development (9 plots) and for model validation (3 plots). All candidate models showed a good perfomance in explaining H-DBH relationship with error estimation of tree height ranging from 0.61 to 1.52 m. Especially, ANN models could reduce the root mean square error (RMSE) by the highest 40%, compared with Power function for the density level of 600 trees. In general, our results showed that ANN models were superior to other six nonlinear models. The H-DBH relationship appeared to differ between stand density levels, thus it is necessary to establish H-DBH models for specific stand densities to provide more accurate estimation of tree height.

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Height Growth of Korean Pine Seedlings Planted under Strip-Cut Larch Plantations in Northeast China

International Journal of Forestry Research ◽

10.1155/2015/178681 ◽

2015 ◽

Vol 2015 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Toshiaki Owari ◽

Shinichi Tatsumi ◽

Liangzhi Ning ◽

Mingfang Yin

Keyword(s):

Northeast China ◽

Mixed Model ◽

Linear Mixed Model ◽

Height Growth ◽

Pinus Koraiensis ◽

Stand Age ◽

Seedling Height ◽

Korean Pine ◽

Open Site ◽

Pine Seedlings

To develop two-storied forest management of larch plantations in Northeast China, this study examined the height growth of Korean pine (Pinus koraiensisSieb. et Zucc.) seedlings planted under strip-cut larch canopies. We measured the height growth of the underplanted seedlings 4 years after planting. The larch canopies were of varying stand age (12, 17, and 37 years) and strip-cut width (4.5, 6.0, and 7.5 m). We measured the seedling height growth in an open site (i.e., a site with no canopy). Underplanted seedlings had a smaller height growth (12.1–20.1 cm year−1) than the seedlings planted in the open site (23.7 cm year−1). The seedlings underplanted in the wider strip-cuts tended to have greater height growth than the seedlings underplanted in the narrowest strip-cuts. A generalized linear mixed model analysis predicted the greatest seedling height growth in the open site. A 36–47% reduction in annual height growth was predicted for the narrowest strip-cuts (4.5 m) versus the open site, while a 13–36% reduction in annual height growth was predicted for the wider strip-cuts (6.0–7.5 m) versus the open site. To maintain adequate height growth, forest managers are recommended to create wider strip-cuts (i.e., ≥6.0 m) for the purpose of underplanting Korean pine seedlings in larch plantations.

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Photosynthesis, leaf morphology and chemistry of Pinus koraiensis and Quercus mongolica in broadleaved Korean pine mixed forest

Photosynthetica ◽

10.1007/s11099-012-0005-y ◽

2012 ◽

Vol 50 (1) ◽

pp. 56-66 ◽

Cited By ~ 7

Author(s):

X. B. Cheng ◽

J. Wu ◽

S. J. Han ◽

Y. M. Zhou ◽

X. X. Wang ◽

...

Keyword(s):

Leaf Morphology ◽

Mixed Forest ◽

Pinus Koraiensis ◽

Korean Pine ◽

Quercus Mongolica

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Differences in growth pattern and response to climate warming between Larix olgensis and Pinus koraiensis in Northeast China are related to their distinctions in xylem hydraulics

Agricultural and Forest Meteorology ◽

10.1016/j.agrformet.2021.108724 ◽

2022 ◽

Vol 312 ◽

pp. 108724

Author(s):

Qiu-Rui Ning ◽

Xue-Wei Gong ◽

Ming-Yong Li ◽

Guang-You Hao

Keyword(s):

Climate Warming ◽

Growth Pattern ◽

Northeast China ◽

Pinus Koraiensis ◽

Larix Olgensis

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Rapid Ecohydrological Response of a Mountaintop Peatland to Recent Climate Warming in Northeast China

10.5194/egusphere-egu21-15329 ◽

2021 ◽

Author(s):

Tingwan Yang ◽

Hongyan Zhao ◽

Zhengyu Xia ◽

Zicheng Yu ◽

Hongkai Li ◽

...

Keyword(s):

High Resolution ◽

Climate Warming ◽

Northeast China ◽

Environmental Changes ◽

Detrended Correspondence Analysis ◽

Plant Macrofossils ◽

Testate Amoebae ◽

High Elevation ◽

Changbai Mountains ◽

Recent Climate

Montane bogs&#8212;peat-forming ecosystems located in high elevation and receiving their water supply mostly from meteoric waters&#8212;are unique archives of past environmental changes. Studying these ecosystems and their responses to recent climate warming will help improve our understanding of the sensitivity of high-elevation peatlands to regional climate dynamics. Here, we report a post-bomb radiocarbon-dated, high-resolution, and multi-proxy record in Laobaishan bog (LBS), a mountaintop bog from the Changbai Mountains Range in Northeast China. We analyzed plant macrofossils and testate amoebae of a 41-cm peat core dated between 1970 and 2009 to document the ecohydrological response of peatland to the anthropogenic warming in recent decades. We quantitatively reconstruct the surface wetness changes of LBS bog using the first axis of the detrended correspondence analysis (DCA) of plant macrofossil assemblages and depth to water table (DWT) inferred by transfer function of testate amoebae assemblages. We distinguished two hydroclimate stages: the moist stage before the 1990s and the rapidly drying stage since the 1990s. During the moist stage, plant macrofossils were characterized by the low abundance of Sphagnum capitifolium and Polytrichum strichum that prefer dry habitats, and testate amoebae assemblages were dominated by low abundance of dry-adapted Assulina muscorum and Corythion dubium. High score of first axis and low DWT also suggested a moist habitat at LBS. After the transition into the drying stage, the abundance of S. capitifolium and P. strichum increased and that of A. muscorum and C. dubium showed similar trend. Score of first axis and DWT reconstructions show that LBS have experienced rapid surface desiccation since the 1990s. Based on the high-resolution gridded reanalysis data, these ecohydrological changes occurred with a rapid increase in temperature (~1&#176;C) but without notable change in total precipitation during the growing season (May&#8211;September) since the 1990s. Besides, backward trajectory analysis showed no apparent changes in atmospheric circulation pattern since the 1990s, supporting our interpretation that the ecohydrological changes in LBS bog were induced by climate warming. These results demonstrate that the plant communities, microbial assemblages, and peatland hydrology of montane peatland show a sensitive response to climate warming that might be in larger amplitude than the low-elevation areas.

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