- Current Issue
- Online First
- Adopt
- Most Downloaded Archive
-
ZHANG Jun, HUANG Jiali, WAN Chunyan, ZHANG Feng, YU Junrui, WANG Hongxiang, ZHU Shidan
2025,33(2):121-130, DOI: 10.11926/jtsb.4869
Abstract:
Exploring the correlation between tree functional traits and growth is helpful to predict the growth dynamics of tree species under climate change. A total of 56 dominant tree species were measured in 3 typical tropical and subtropical forest plots, including branch embolism resistance (P50), water conductivity (ks), wood density (WD), specific leaf area (SLA), and vessel anatomical traits. Diametral growth rate (DGR) of large diameter class (DBH≥15 cm), small diameter class (5-15 cm) and undifferentiated diameter class (≥5 cm) were calculated based on community survey data, and the correlation between traits and DGR was analyzed. The results showed that DGR of different diameter classes was positively correlated with ks, but not with SLA, P50 and vessel anatomical traits. WD and DGR with small diameter tree species were negatively correlated, but not with large diameter tree species. Therefore, it was suggested that xylem water conductivity could better predict the growth rate of tropical and subtropical forest trees than economic traits.
-
GAN Jingxi, ZHANG Feng, HUANG Dongliu, ZHU Shidan
2025,33(2):131-139, DOI: 10.11926/jtsb.4863
Abstract:
The montane evergreen broad-leaved forest in the south subtropical zone has important ecological value, but the environment adaptation strategies of montane forest species are still not well understood. Based on the fixed monitoring plots of south subtropical mountain forest, xylem anatomical structure, saturated water content, mechanical strength and hydraulic structure of 25 representative evergreen tree species were determined, xylem economic spectrum was analyzed, and physiological and ecological strategies of tree species in mountain forest were clarified. The results showed that the specific conductivity of sapwood was significantly correlated with the vessel density and the proportion of vessel cavities, but there was no direct correspondence between other xylem structural characteristics and physiological functions. The lack of common structural basis led to no significant correlation between xylem hydraulic properties, saturated water content and mechanical strength. Therefore, the tree species in the mountain forest do not support the xylem economic pedigree. There was no tradeoff between sapwood specific conductivity and embolic resistance, which may be related to the lower environmental selection pressure in mountain forest. The tree species with higher community importance value had lower wood density and higher sapwood specific conductivity and saturated water content, indicating that improving xylem water transport capacity and water storage capacity was conducive to adapting to the mountain environment. This study revealed the diversity of xylem character combinations of evergreen tree species in mountain forest, which is conducive to tree species coexistence and coping with environmental changes.
-
REN Yiping, YANG Mei, REN Shiqi, ZHU Hui, WEI Zhendao, WU Qi
2025,33(2):140-148, DOI: 10.11926/jtsb.4877
Abstract:
The study aimed to predict the tree height of large-diameter mixed plantations of Eucalyptus urophylla×E. grandis using convolutional neural networks (CNN) and provide a theoretical basis for forest resource monitoring and evaluation. The research focused on 24 plots of mixed plantations of Eucalyptus urophylla×E. grandis intercropped with Mytilaria laosensis, Castanopsis hystrix, Manglietia glauca, and Michelia macclure at the Nanning Eucalyptus Field Station. By combining the information of dominant tree species (groups) in the stand and using statistical inference based on sample information and prior information of CNN, suitable model structures for each tree species (group) were obtained through training. Using basically consistent modeling data, traditional tree height equations were solved, and the modeling plots that did not participate in the modeling were used as a validation set for comparative analysis based on six classical models of nonlinear models or nonlinear mixed effects and three CNN models based on activation functions. The results showed that the RMSE (root-mean-square error) values of Näslund, Curtis, Logistic, Weibull, Gomperz, and Korf traditional models and the L-M model (Model I) ranged from 2.5 to 5.6. The CNN model with ReLU activation function (Model II) had a RMSE of 2.304 2 and a R2 of 0.814 9, while the CNN model with Logistic activation function (Model III) had a R2 of 0.958 8. The activation function models of CNN do not rely on empirical model selection. Compared with traditional empirical models, the CNN model of tree height-diameter at breast height (DBH) based on the Logistic equation has a higher determination coefficient and lower root mean square error, with generally higher fitting accuracy. It can better fit the growth patterns of different tree species, improve the accuracy and stability of predictions, and optimize the ecological and economic benefits of forestry.
-
XIE Wanli, WANG Qiyue, WANG Qiuxue, GAN Wanyi, WU Yanfang, HUANG Liujing
2025,33(2):149-158, DOI: 10.11926/jtsb.4866
Abstract:
In order to understand the function, composition and succession trend of autoherbous community in Fuzhou section of the Minjiang River, the ecological niche, interspecific association and community stability of autoherbous communities were studied by using niche determination, variance ratio (VR), χ2 test, association coefficient (AC), Spearman rank correlation test and M. Godron stability methods. The results showed that niche similarity and niche overlap index of dominant species in autoherbous communities were generally low, and inter-specific competition was not intense. Most of the species with large importance value and niche width were invasive plants, which were easy to threaten native plants. The dominant species in the community showed no significant positive association on the whole. The results ofχ2 test, association coefficient, and Spearman rank correlation showed that the positive association was not obvious, indicating that the interspecific association and stability of the dominant species in the community were weak, and each species tended to distribute independently. The results of M. Godron analysis showed that the community was currently in an unstable state. Due to the harsh conditions along urban river, flooding interference and human disturbance, the autoherbous community was unstable and still in the early stage of succession.
-
XIONG Zihui, WANG Xu, YANG Huai, WENG Guojie, WU Hao, YU Lei, MA You
2025,33(2):159-166, DOI: 10.11926/jtsb.4860
Abstract:
It is of great significance to study the carbon storage changes of rubber forest (Hevea brasiliensis) at different ages for understanding the carbon sequestration potential and carbon cycling process in rubber plantation ecosystems. Rubber forests of different ages (6, 12, 18, 23, 27, 35 years old) in Danzhou City, Hainan Province were studied to analyze the changes of tree layer, understory vegetation, litter, soil and ecosystem carbon storage during the growth of rubber forests, and compare the carbon sequestration rate and carbon sequestration potential of rubber forest ecosystems. The results showed that the carbon stock in the tree layer ranged from 14.87 to 63.53 t C/hm2, in the order of 35->27->23->18->6-years old. The carbon stock of understory vegetation ranged from 0.30 to 0.75 t C/hm2, and which at 35 years old was significantly higher than that of other stands. The litter carbon stock ranged from 1.72 to 2.03 t C/hm2, and which in the 18- and 35-year-old forests were the highest. Soil carbon stock varied from 81.21 to 156.68 t C/hm2 in the order of 27->18->23->12->35->6-years old. During the life cycle of 35 years, approximately 25.27 t C/hm2 of carbon was fixed in the soil, and there is a transition process from carbon fixation to carbon emission. The total carbon stock of rubber forest ecosystems ranged from 98.30 to 214.74 t C/hm2 in the order of 27->18->23->35->12->6-years old. Notably, the carbon storage of 6-years old plantation was significantly lower than that of 27-years old mature plantation. Carbon storage in soil and tree layer was an important carbon reservoir of rubber forest, accounting for 68.16%-91.27% and 16.71%-40.59% of the total ecosystem carbon storage, which in litter was less than 2.1%, and that in understory was less than 1%. Rubber forest ecosystem had a high carbon sequestration rate and carbon sequestration potential, which was an ideal tree for building efficient carbon sequestration plantation and promoting regional effective emission reduction strategy.
-
FENG Zhe, YU Xiaoli, SUN Jiwen, WANG Liping, CHEN Fengxian, HU Xiaokang, WU Junjie
2025,33(2):167-176, DOI: 10.11926/jtsb.4870
Abstract:
In order to explore the factors influencing the seedling dynamics of woody plants, the effects of functional trait diversity, phylogenetic diversity and environmental filtering on the mean survival rate and mean growth rate of seedlings were analyzed, as well as their dynamic changes among plots with different seedling densities. In the west slope of Cangshan Mountain in Yunnan Province, there were 256 seedling quadrats set up in four plots with different seedling densities. The seedling data from 2020 to 2022 were collected and analyzed with a linear mixed model. The results showed that the average survival rate of seedlings was affected by functional trait diversity and phylogenetic diversity, and functional trait diversity and phylogenetic diversity had significant positive effects on the average survival rate of seedlings in low seedling density plots. The average growth rate of seedlings was mainly affected by phylogenetic diversity and environmental filtration, and the phylogenetic diversity had a significant negative effect in high seedling density plots. Low quadrat slope and high soil moisture were the key factors for seedling growth. The standardized phylogenetic diversity index was high in the plots with low seedling density, while the functional dispersion index was high in the plots with high seedling density. So, these would provide a new perspective and method for understanding and predicting seedling dynamics, and also provides practical guidance for forest restoration and protection.
-
ZHONG Qiusheng, SHAN Ruiyang, LIN Zhenghe, HUANG Ting, LI Xinlei, CHEN Changsong
2025,33(2):177-186, DOI: 10.11926/jtsb.4880
Abstract:
In order to investigate the composition of metabolites in the leaves of a new tea strain of ‘Chunlv’, the metabolites in the leaves of ‘Chunlv’ and mother tree (‘Fuyun 6’) were analyzed by using LC-MS and GC-MS. The results showed that 50 metabolites with significant differences (VIP>1.0) were identified by GC-MS, mainly including sugars and amino acids, among which 9 were up-regulated and 41 were down-regulated. The chlorogenic acid content had the greatest difference. There were 297 metabolites with significant differences (VIP>1.0) identified by LC-MS, 176 up-regulated and 121 down-regulated, mainly concentrated in polyphenols, alkyds and sugars, among which caffeine had the greatest difference. Pathway enrichment analysis showed that the differential metabolites were mainly enriched in the biosynthesis pathway of flavonoids and flavonols, the biosynthesis pathway of arginine, the biosynthesis pathway of unsaturated fatty acids, and the mutual conversion pathway of pentose and glucuronic acid. Variable contribution analysis of OPLS-DA showed that most of the potential biomarkers were related to energy metabolism and quality, linoleic acid, oleic acid, phytol, hydroxypiperidolic acid, ribosol, xylose were related to energy metabolism, chlorogenic acid, tryptophan, caffeine, theophylline and so on were closely related to quality. The analysis of metabolites and metabolic pathways provided a theoretical basis for the quality formation and variety breeding of ‘Chunlv’.
-
LIN Chenyu, GUO Xin, YU Xiaohui, ZHAO Pingjuan
2025,33(2):187-196, DOI: 10.11926/jtsb.4868
Abstract:
Jasmonate ZIM-domain (JAZ) proteins play an important role in plant response to biological and abiotic stresses. There were 16 MeJAZ genes identified in Manihot esculenta by bioinformatics, which were unevenly distributed on 11 chromosomes. Among the 16 MeJAZ genes, 7 pairs of gene showed collinear relationship, all of which were fragment repeat genes, and the Ka/Ks of the 4 collinear genes with high similarity were less than 1, indicating that the JAZ family genes were selected for purification in evolution. Thirteen MeJAZ proteins contained ZIM, Jas and NT domains, and the other 3 MeJAZ proteins were missing NT domains. Thirteen MeJAZ genes contained complete UTR, intron and exon sequences, the other genes lacked the UTR region or intron sequences. The promoter region of MeJAZs contained multiple cis-acting elements responsing to abiotic stresses, ABA and SA. There were more MeJAZs with high expression in root tuber and flower, such as MeJAZ2/MeJAZ4/MeJAZ6/MeJAZ9/MeJAZ13, followed by stems. At the same time, most of MeJAZ genes responded to multiple abiotic stresses, drought induced the expression of more MeJAZ genes, and the MeJAZ16 gene was significantly induced by SA. Therefore, these would provide a reference for genetic improvement and selection of high-quality genes in Manihot esculenta.
-
ZHOU Jingjing, MIAO Lingfeng, LI Dadong, TIAN Mengjie, YANG Fan
2025,33(2):197-206, DOI: 10.11926/jtsb.4875
Abstract:
In order to explore the effects of drought-salt combined stress on the growth, physio-chemical characteristics of terrestrial woody plants, pot experiments were conducted in drought-salt combined stress (SD), the growth, photosynthetic pigment content and physiological and biochemical indexes of Dalbergia odorifera seedlings with three planting densities [1 plant (DI), 2 plants (DII) and 3 plants (DIII) per pot, respectively] were studied under 25%-30% field water capacity + 150 mmol/L NaCl. The results showed that SD treatment significantly inhibited the growth of plant height, basal diameter, total leaf area, taproot length, total chlorophyll content and relative water content at DI density, but increased the activities of catalase and glutathione reductase (GR), soluble protein and soluble sugar content. Compared with DI density, DIII density further reduced GR activity and reduced glutathione content, resulting in inhibition of seedling growth. Therefore, under the combined drought and salt stress environment, planting density would affect the growth of D. odorifera, and low density planting mode should be considered in the coastal zone.
-
WU Fengnian, FU Jiawei, CHEN Ying, HUANG Jiajia, SU Qiting, ZHENG Jiaqi, CHEN Zikai, ZHU Hui, ZHENG Yuzhong, HUANG Jianjian
2025,33(2):207-212, DOI: 10.11926/jtsb.4864
Abstract:
In order to understand the effects of salt stress on the growth of Baccaurea ramiflora seedlings, the physiological mechanism of stress resistance were studied treated with different soil salt concentrations (0.05%, 0.1%, 0.15% and 0.2%). The results showed that salt stress stimulated the adaptability of B. ramiflora seedlings, especially at low salt concentration (0.05%), soluble sugar content and peroxidase activity increased significantly. When the salt concentration reached 0.1%, the soluble protein content increased significantly. The content of malondialdehyde increased significantly at 0.15% salt concentration. The content of free proline and flavonoids showed significant accumulation at 0.2% salt concentration. In the initial phase (1st week) of salt treatment, peroxidase activity responded rapidly, and other indicators changed significantly after 2 weeks. Some indexes, such as free proline and soluble protein contents and peroxidase activity, increased at first and then decreased with the treatment time. So, it was of great significance for breeding salt-tolerance of B. ramiflora and developing salt-tolerant crops.
-
CHEN Qihua, ZHENG Yingying, Chen Liuben, ZHANG Bo, HE Shibin, DING Guochang, RUAN Shaoning
2025,33(2):213-219, DOI: 10.11926/jtsb.4873
Abstract:
In order to breeding superior clones of Acacia cincinnata, the genetic variation and trait correlation of main traits of 15 clones at 7 year old were analyzed by variance analysis, genetic parameter estimation, correlation analysis, path analysis and comprehensive evaluation. The results showed that there were significant differences in tree height, DBH, volume and height under branches among clones, and their repeatability was 0.71, 0.64, 0.42 and 0.49, respectively. Tree height and volume were significantly correlated with other traits. The DBH was significantly correlated with stem shape at 0.05 level, but with other traits at 0.01 level. The crown width was negatively correlated with height under branches and positively correlated with stem shape. The path analysis showed that DBH had the greatest contribution to single tree volume, followed by tree height and crown width, and their direct path coefficients of DBH were 0.566 5, 0.389 9 and 0.172 8, respectively, and the total effect values were 0.904 7, 0.825 8 and 0.877 9, respectively. The selected clones were SS2, SS3 and ZJ22 with the selection rate of 20% by using Breggin’s multi-character comprehensive evaluation method, which could be considered as the comprehensive improved A. acacia clones for local promotion.
-
GU Heng, YANG Xiulian, WANG Lianggui
2025,33(2):220-228, DOI: 10.11926/jtsb.4861
Abstract:
Osmanthus fragrans is an important ornamental species integrating greening, beautification and fragrance, which has been attracting much attention. In recent years, the development and improvement of sequencing technology has greatly promoted the research on molecular biology of O. fragrans. Based on the literatures, the recent progress of molecular biology research on O. fragrans was summarized. Firstly, the whole genome of O. fragrans and related gene family analysis were reviewed. Seconed, the progress of transcriptome sequencing on important traits were further eleborated, such as the flower coloration, floral scent and leaf color; Then, the reports of O. fragrans proteome and functional genes were discussed; Finally, the molecular biology research of O. fragrans were summarized, which made an outlook of the future key research directions and providing the references of O. fragrans research in the future.
-
BI Xiaorui, GE Bohao, CHEN Yuzhen, LU Cunfu
2025,33(2):229-240, DOI: 10.11926/jtsb.4905
Abstract:
Intermediate filaments (IFs) are cytoskeletal protein filaments with an apparent diameter of around 10 nm, intermediate between microtubules (25 nm) and microfilaments (5-7 nm). IFs have been found to form multiple types of proteins in different tissues and are tissue-specifically expressed during organismal development. In animal cells, IFs maintain cell and tissue morphology by providing mechanical stability, and many different genes encoding IF proteins have been identified. In the 1980s, intermediate filaments in plant cells were initially demonstrated by some immunological evidences. In recent years, a number of IF proteins have been discovered in plants that perform the same functions as animal IF. IF proteins can regulate gene expression by modulating the lamin-chromatin network. In this paper, we review the progress and results of the study of IF in plant cells, and a comprehensive and in-depth study of IF proteins in plants will be of great significance for the exploration of cytoskeletal functions.
