scholarly journals Directional Variability in Response of Pinus koraiensis Radial Growth to Climate Change

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1684
Author(s):  
Yingjie Sun ◽  
Mark Henderson ◽  
Binhui Liu ◽  
Hong Yan
Keyword(s):  
Climate Change ◽  
Tree Ring ◽  
Tree Growth ◽  
Radial Growth ◽  
Maximum Temperature ◽  
Pinus Koraiensis ◽  
Climate Trends ◽  
The Difference ◽  
Individual Scale ◽  
Individual Trees

Climate change affects forest ecosystems at a variety of scales, from the composition of landscapes to the growth of individual trees. Research across regions and tree species has produced contradictory findings on the effects of climate variables on radial growth. Here, we examine tree ring samples taken from four directions of a tree to determine whether there is directional variability in tree growth in relation to climate trends. The results showed directional differences in the temporal growth processes of Pinus koraiensis, with more commonalities between the west and north directions and between the east and south directions. The contemporaneous June maximum temperature was the main climate factor associated with the difference between the growth of tree rings toward the east or west. Annual tree ring growth toward the east was more affected by the year’s temperature while growth toward the south was more sensitive to the year’s precipitation. Our research demonstrates that diverse response of tree growth to climate may exist at intra-individual scale. This contributes to understanding the sensitivity of tree growth to climate change at differ scales.

scholarly journals Comparison of the Radial Growth Response of Picea crassifolia to Climate Change in Different Regions of the Central and Eastern Qilian Mountains

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 1015
Author(s):  
Xuan Wu ◽  
Liang Jiao ◽  
Dashi Du ◽  
Changliang Qi ◽  
Ruhong Xue
Keyword(s):  
Climate Change ◽  
Tree Growth ◽  
Central Region ◽  
Radial Growth ◽  
Growing Season ◽  
Qilian Mountains ◽  
Growth Patterns ◽  
Total Precipitation ◽  
Picea Crassifolia ◽  
The Qilian Mountains

It is important to explore the responses of radial tree growth in different regions to understand growth patterns and to enhance forest management and protection with climate change. We constructed tree ring width chronologies of Picea crassifolia from different regions of the Qilian Mountains of northwest China. We used Pearson correlation and moving correlation to analyze the main climate factors limiting radial growth of trees and the temporal stability of the growth–climate relationship, while spatial correlation is the result of further testing the first two terms in space. The conclusions were as follows: (1) Radial growth had different trends, showing an increasing followed by a decreasing trend in the central region, a continuously increasing trend in the eastern region, and a gradually decreasing trend in the isolated mountain. (2) Radial tree growth in the central region and isolated mountains was constrained by drought stress, and tree growth in the central region was significantly negatively correlated with growing season temperature. Isolated mountains showed a significant negative correlation with mean minimum of growing season and a significant positive correlation with total precipitation. (3) Temporal dynamic responses of radial growth in the central region to the temperatures and SPEI (the standardized precipitation evapotranspiration index) in the growing season were unstable, the isolated mountains to total precipitation was unstable, and that to SPEI was stable. The results of this study suggest that scientific management and maintenance plans of the forest ecosystem should be developed according to the response and growth patterns of the Qinghai spruce to climate change in different regions of the Qilian Mountains.

Radial growth of Pinus koraiensis and Picea koraiensis response to climate change in Yichun City,Heilongjiang Province

2020 ◽  
Vol 40 (4) ◽  
Author(s):  
苑丹阳 YUAN Danyang ◽  
赵慧颖 ZHAO Huiying ◽  
李宗善 LI Zongshan ◽  
朱良军 ZHU Liangjun ◽  
国淼 GUO Miao ◽  
...  
Keyword(s):  
Climate Change ◽  
Radial Growth ◽  
Pinus Koraiensis ◽  
Heilongjiang Province ◽  
Picea Koraiensis

scholarly journals Responses of Larix principis-rupprechtii Radial Growth to Climatic Factors at Different Elevations on Guancen Mountain, North-Central China

Forests ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 99
Author(s):  
Jiachuan Wang ◽  
Shuheng Li ◽  
Yili Guo ◽  
Qi Yang ◽  
Rui Ren ◽  
...  
Keyword(s):  
Tree Ring ◽  
Radial Growth ◽  
Climatic Factors ◽  
Pearson Correlation ◽  
Coniferous Forest ◽  
Ring Width ◽  
Central China ◽  
Summer Drought ◽  
Climate Trends

Larix principis-rupprechtii is an important afforestation tree species in the North China alpine coniferous forest belt. Studying the correlations and response relationships between Larix principis-rupprechtii radial growth and climatic factors at different elevations is helpful for understanding the growth trends of L. principis-rupprechtiind its long-term sensitivity and adaptability to climate change. Pearson correlation, redundancy (RDA), and sliding analysis were performed to study the correlations and dynamic relationships between radial growth and climatic factors. The main conclusions are as follows: (1) The three-elevation standard chronologies all exhibited high characteristic values, contained rich climate information and were suitable for tree-ring climatological analyses. (2) Both temperature and precipitation restricted low-elevation L. principis-rupprechtii radial growth, while monthly maximum temperatures mainly affected mid-high-elevation L. principis-rupprechtii radial growth. (3) Mid-elevation L. principis-rupprechtii radial growth responded to climate factors with a “lag effect” and was not restricted by spring and early summer drought. (4) Long-term sliding analysis showed that spring temperatures and winter precipitation were the main climatic factors restricting L. principis-rupprechtii growth under warming and drying climate trends at different elevations. The tree-ring width index and Palmer drought severity index (PDSI) were positively correlated, indicating that L. principis-rupprechtii growth is somewhat restricted by drought. These results provide a reference and guidance for L. principis-rupprechtii management and sustainable development in different regions under warming and drying background climate trends.

scholarly journals Lowering Stand Density Enhances Resiliency of Ponderosa Pine Forests to Disturbances and Climate Change

2019 ◽  
Vol 65 (4) ◽  
pp. 496-507 ◽  
Author(s):  
Jianwei Zhang ◽  
Kaelyn A Finley ◽  
Nels G Johnson ◽  
Martin W Ritchie
Keyword(s):  
Climate Change ◽  
Tree Growth ◽  
Ponderosa Pine ◽  
Tree Mortality ◽  
Ring Width ◽  
Basal Area ◽  
Stand Density ◽  
Site Quality ◽  
Climate Trends ◽  
Ponderosa Pine Forests

AbstractStand density affects not only structure and growth, but also the health of forests and, subsequently, the functions of forest ecosystems. Here, we integrated dendrochronology and repeated inventories for ponderosa pine research plots to determine whether long-term growth and mortality responded to climate trends and how varying stand density influenced the responses. The plots were established prior to 1975 on existing stands throughout northern California. Although annual temperature increased consistently for the last 65 years, ring-width indices produced by eliminating age and thinning effects failed to detect radial trend regardless of site quality. However, interannual variation for the indices was substantial, reflecting a strong influence of climate on tree growth. Plot-level basal area increments were significantly affected by tree mortality. Stand density index explained most variation of mortality. Lowering stand density enhanced remaining tree growth, reduced mortality, and increased stand resiliency to disturbances and climate change. Besides higher climate moisture indices or lower vapor pressure deficits, any treatments that improve tree vigor and reduce stress will have a similar effect to reducing stand density. Although neither biotic disturbances nor abiotic conditions can be controlled, forest managers can manage stand density appropriately to enhance resilience to climate change and disturbances.

scholarly journals Using Tree Rings to Predict the Response of Tree Growth to Climate Change in the Continental United States during the Twenty-First Century

2010 ◽  
Vol 14 (19) ◽  
pp. 1-20 ◽  
Author(s):  
A. Park Williams ◽  
Joel Michaelsen ◽  
Steven W. Leavitt ◽  
Christopher J. Still
Keyword(s):  
Climate Change ◽  
United States ◽  
Tree Ring ◽  
Tree Growth ◽  
Ring Width ◽  
First Century ◽  
Annual Growth ◽  
Climate Variations ◽  
Tree Ring Data ◽  
Twenty First Century

Abstract In the early 1900s, tree-ring scientists began analyzing the relative widths of annual growth rings preserved in the cross sections of trees to infer past climate variations. Now, many ring-width index (RWI) chronologies, each representing a specific site and species, are archived online within the International Tree-Ring Data Bank (ITRDB). Comparing annual tree-ring-width data from 1097 sites in the continental United States to climate data, the authors quantitatively evaluated how trees at each site have historically responded to interannual climate variations. For each site, they developed a climate-driven statistical growth equation that uses regional climate variables to model RWI values. The authors applied these growth models to predict how tree growth will respond to twenty-first-century climate change, considering four climate projections. Although caution should be taken when extrapolating past relationships with climate into the future, the authors observed several clear and interesting patterns in the growth projections that seem likely if warming continues. Most notably, the models project that productivity of dominant tree species in the southwestern United States will decrease substantially during this century, especially in warmer and drier areas. In the northwest, nonlinear growth relationships with temperature may lead to warming-induced declines in growth for many trees that historically responded positively to warmer temperatures. This work takes advantage of the unmatched temporal length and spatial breath of annual growth data available within the ITRDB and exemplifies the potential of this ever-growing archive of tree-ring data to serve in meta-analyses of large-scale forest ecology.

A 1397-year tree-ring chronology of Thujaoccidentalis from cliff faces of the Niagara Escarpment, southern Ontario, Canada

1994 ◽  
Vol 24 (5) ◽  
pp. 1049-1057 ◽  
Author(s):  
P.E. Kelly ◽  
E.R. Cook ◽  
D.W. Larson
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
Regional Climate ◽  
Maximum Temperature ◽  
Ecological Data ◽  
Tree Ring Chronology ◽  
Important Species ◽  
Radiocarbon Dates ◽  
Southern Ontario ◽  
Niagara Escarpment

Living and dead Thujaoccidentalis L. (eastern white cedar) on cliff faces and in the talus of the Niagara Escarpment, southern Ontario were sampled and measured for dendrochronological analyses. One hundred and forty-two tree-ring series were cross-dated and a 1397-year tree-ring chronology was produced spanning the period 594–1990 A.D., making it the longest in Canada. An additional 784-year floating chronology was constructed from dead debris at the base of the cliff. Radiocarbon dates indicate that the floating chronology begins approximately in 580 B.C. Correlations between the tree-ring indices and 51 climate variables indicate that growth in T. occidentalis is negatively correlated with the previous growing season's temperature. The strongest correlation was between radial tree growth and maximum temperature in the previous July and August. Extremely hot summer conditions will negatively impact tree growth in the following year. These temperature correlations are very similar to those observed for T. occidentalis growing in western Quebec. This consistent climate response and the extreme longevity of T. occidentalis means that it is now an important species to exploit for dendroclimatological reconstructions of regional climate. The close proximity of these sites to the industrial heartland of eastern North America suggests that this, and future Thuja chronologies under development from the Niagara Escarpment, will provide an important ecological data base for exploring the human component of climate change.

scholarly journals Can we distinguish between tree-ring eccentricity developed as a result of landsliding and prevailing winds? consequences for dendrochronological dating

2018 ◽  
Vol 45 (1) ◽  
pp. 223-234 ◽  
Author(s):  
Małgorzata Wistuba ◽  
Ireneusz Malik ◽  
Marek Krąpiec
Keyword(s):  
Tree Ring ◽  
Normal Growth ◽  
Prevailing Wind ◽  
Reference Sites ◽  
Eccentricity Index ◽  
The Difference ◽  
Study Sites ◽  
The One ◽  
Individual Trees ◽  
The Impact

Abstract The aim of our study was to compare patterns of tree-ring eccentricity developed in Norway spruce trees as a result of landsliding with the one caused by the prevailing wind (in 2 study sites), and with the normal growth of trees (in 2 reference sites). We sampled 20 trees per study site and 10 per reference site. Two cores were taken from each tree (120 cores in total) from the upslope and downslope, windward and leeward sides of stems. Ring widths measured on opposite sides of stems were compared using the method of percent eccentricity index. Graphs of the index obtained for individual trees were analysed. Statistical indicators were calculated for a percent eccentricity index. Disturbance events were dated and the response index was calculated. The results show that the patterns of eccentricity developed as a result of the prevailing winds and due to landsliding differ from one another and from the reference sites. The results suggest that the impact of the prevailing wind on tree growth is more severe than the impact of landsliding. The difference may result from the slow-moving character of the landslide under study. The results, however, indicate that wind impact should be taken into account in dendrogeomorphic research and that the impact of mass movements should be considered in dendroecological studies on wind.

scholarly journals Long-Term Effects of Climate and Competition on Radial Growth, Recovery, and Resistance in Mongolian Pines

2021 ◽  
Vol 12 ◽  
Author(s):  
ShouJia Sun ◽  
JinSong Zhang ◽  
Jia Zhou ◽  
ChongFan Guan ◽  
Shuai Lei ◽  
...  
Keyword(s):  
Tree Ring ◽  
Tree Growth ◽  
Radial Growth ◽  
Climatic Factors ◽  
Regional Scale ◽  
Growth Period ◽  
Reconstruction Method ◽  
Long Term Effects ◽  
Drought Vulnerability ◽  
Tree Ring Data

Understanding the response of tree growth and drought vulnerability to climate and competition is critical for managing plantation forests. We analyzed the growth of Mongolian pines in six forests planted by the Three-North Shelter Forest Program with tree-ring data and stand structures. A retroactive reconstruction method was used to depict the growth-competition relationships of Mongolian pines during the growth period and their climatic responses under different competition levels. Drought vulnerability was analyzed by measuring the basal area increment (BAI) of different competition indices (CIs). In young trees, differences in BAIs in stands with different CIs were not statistically significant. After 15–20 years, medium- and high-CI stands had significantly lower tree-ring widths (TWs) and BAIs than the low-CI stands (p < 0.05). The standardized precipitation evapotranspiration index (SPEI), precipitation, relative humidity, and vapor pressure deficit were major factors affecting tree growth. On a regional scale, climate outweighed competition in determining radial growth. The relative contribution of climatic factors increased with the gap in SPEI between plantation sites and the native range, while the reverse pattern of the competition-growth relationship was observed. Drought reduced TWs and BAIs at all sites. Stands of different CIs exhibited similar resistance, but, compared with low-CI stands, high- and medium-CI stands had significantly lower recovery, resilience, and relative resilience, indicating they were more susceptible to drought stresses. Modeled CI was significantly negatively related to resistance, resilience, and relative resilience, indicating a density-dependence of tree response to drought. After exposure to multiple sequential drought events, the relative resilience of high-CI stands decreased to almost zero; this failure to fully recover to pre-drought growth rates suggests increased mortality in the future. In contrast, low-CI stands are more likely to survive in hotter, more arid climates. These results provide a better understanding of the roles of competition and climate on the growth of Mongolian pines and offer a new perspective for investigating the density-dependent recovery and resilience of these forests.

scholarly journals Contrasted effects of climate change on low-altitude relict Pinus uncinata stands in the Northern French Alps

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Christophe Corona ◽  
Markus Stoffel ◽  
Jérôme Lopez Saez
Keyword(s):  
Climate Change ◽  
Tree Ring ◽  
Tree Growth ◽  
Soil Water Potential ◽  
Soil Conditions ◽  
Growth Responses ◽  
Cold Air ◽  
French Alps ◽  
Pinus Uncinata ◽  
Low Altitude

AbstractThis paper reports on climate-induced growth changes in relict, low-altitude mountain pines (Pinus uncinata Mill. ex. Mirb.) from two refugia with cold microclimates located in the Northern French Alps. The P. uncinata stands analyzed grow at the lower bound of their ecological limit and are thus thought to be sensitive indicators of ongoing climate change. Using dendroecological approaches, we compare tree-ring growth at two closely spaced low-altitude stands in the Chartreuse massif (French Alps): La Plagne and Cirque de Bresson. La Plagne is a N-NW-exposed, ventilated slope with cold air circulating in the scree during summer, and the presence of sporadic permafrost as well as ground overcooling, whereas Cirque de Bresson is located on a small, S-exposed fan with sporadic avalanche activity. At both sites, growth responses of P. uncinata to changes in twentieth and twenty-first centuries temperature and precipitation conditions were investigated by means of moving correlation analyses. At Cirque de Bresson, a significant and rapid decline in tree-ring widths has been observed since the early 1990s. We attribute this decline to (i) increasing air temperatures at the beginning of the growing season (May–June) as well as to (ii) a decrease in soil water potential. At La Plagne, we do not detect any significant trend between the higher summer temperatures and tree growth, presumably as a result of the circulation of cold air in the scree slope, which is thought to maintain fresh and humid soil conditions and therefore favor tree growth. These forest stands provide prime examples on how dendroecology can contribute to the study of the dynamics and local variability of tree growth and climate change in relict forest populations with high ecological and conservation values.

Climate change impacts and transformative adaptation strategies among farming households in the City of Koronadal, Philippines

2021 ◽  
Vol 4 (1) ◽  
pp. 70-81
Author(s):  
Lorena Sabino ◽  
◽  
Juan Pulhin ◽  
Josefina Dizon ◽  
Rex Victor Cruz ◽  
...  
Keyword(s):  
Climate Change ◽  
Financial Management ◽  
Warning System ◽  
Adaptation Strategies ◽  
Maximum Temperature ◽  
Mountain Range ◽  
Climate Trends ◽  
Environmental Aspect ◽  
The City ◽  
Transformative Adaptation

Farmers in the Roxas mountain range, City of Koronadal used to have bountiful harvests during the time when the city was still free from climate-related hazards. However, this situation has recently changed due to the increasing climate-related risk events. Moreover, localized baseline scientific climate information is limited to foster the development of appropriate adaptations and policies toward climate-resilient communities. This study assessed the climate trends and the changes, impacts, and adaptation strategies of farm households in five barangays in the Roxas mountain range, Koronadal City, South Cotabato. The study conducted household surveys with 265 respondents, focus group discussions, and key informant interviews. In using Mann-Kendall test statistics, time series analysis and one-way analysis of variance, the findings from 1981 to 2012 show increasing trends with significant changes (p <0.01) in mean minimum temperature, increasing by 0.74 °C for three decades. In contrast, mean maximum temperature showed a decreasing trend with an average decrease of 0.65 °C, p <0.01). In three decadal periods, an average increase of 0.04 °C in monthly mean temperature was observed. Rainfall patterns during the same period also show significant changes in the months of June (p <0.01), August, and December (p <0.05); these findings suggest that climate change occurred. Floods, landslides, and droughts were experienced by the communities, which had devastating socioeconomic and environmental impacts. The existing adaptation strategies are just stop-gap solutions that address the effects of climate change but do not consider the root causes. To consider future changes in climate patterns, the socioeconomic and political structure and processes of the communities need to change; this can be achieved if multifaceted drivers of climate change hazards and their impacts are appropriately and immediately addressed. Some grassroot-level transformative adaptation strategies identified in the study consist of socioeconomic facets, specifically, investment in children’s education, financial management, family planning, and development of alternative on-farm and nonfarm livelihood options. The environmental aspect, which includes promoting agroforestry system, water impoundment technologies, and advanced early warning system, were also considered.

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