CAS IR GRID研究单元&专题: 西双版纳热带植物园中国科学院西双版纳热带植物园,国家AAAAA级旅游景区,位于中国云南省西双版纳傣族自治州勐腊县勐仑镇葫芦岛,中国面积最大、收集物种最丰富、植物专类园区最多的植物园 ,也是集科学研究、物种保存和科普教育为一体的综合性研究机构和风景名胜区。 中国科学院西双版纳热带植物园前身为1959年蔡希陶教授领导创建的“西双版纳热带植物园”,经历数次重组、改隶后,1996年9月经中央机构编制委员会办公室批准,定名为中国科学院西双版纳热带植物园,隶属于中国科学院。http://www.irgrid.ac.cn:8080/handle/1471x/4354012024-03-28T17:11:50Z2024-03-28T17:11:50ZResponse of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydratesShen, Jing-XianZhang, Yong-JiangMaenpuen, PhisamaiZhang, Shu-BinZhang, LanYang, LinTao, Lian-BinYan, Peng-YunZhang, Zhi-MingLi, Shu-QiongYuan, XiaKongjarat, WanwaleeKaewkamol, SasiwimolTinprabat, PimnaraChen, Ya-Junhttp://www.irgrid.ac.cn:8080/handle/1471x/71421562022-05-06T17:30:26Z2022-04-25T03:14:41Z题名: Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates
作者: Shen, Jing-Xian; Zhang, Yong-Jiang; Maenpuen, Phisamai; Zhang, Shu-Bin; Zhang, Lan; Yang, Lin; Tao, Lian-Bin; Yan, Peng-Yun; Zhang, Zhi-Ming; Li, Shu-Qiong; Yuan, Xia; Kongjarat, Wanwalee; Kaewkamol, Sasiwimol; Tinprabat, Pimnara; Chen, Ya-Jun
摘要: <p>Extreme drought events are becoming frequent globally, resulting in widespread plant mortality and forest dieback. Although savanna vegetation cover similar to 20% of the earth's land area, their responses to extreme drought have been less studied than that of forests. Herein, we quantified branch dieback, individual mortality and the associated physiological responses of four evergreen shrubs (Tarenna depauperate Hutch., Maytenus esquirolii (H. Lev.) C.Y. Cheng, Murraya exotica L., Jasminum nudiflorum Lindl.) in a savanna ecosystem in Southwest China to an incidence of extreme drought during 2019 and 2020. We found that 80-100% of the individuals of these species exhibited branch dieback, whereas individual mortality was only found in T. depauperate (4.5%). All species showed high resistance to stem embolism (P-50, water potential at 50% loss of hydraulic conductivity ranged from -5.62 to -8.6 MPa), whereas the stem minimum water potentials reached -7.6 to ca -10.0 MPa during the drought. The low water potential caused high native embolism levels (percentage loss of hydraulic conductivity (PLC) 23-65%) in terminal branches, and the remaining stems maintained 15-35% PLC at the end of the drought. Large within-individual variations in stem vulnerability to embolism were detected, and shedding of vulnerable branches could be a mechanism for shrubs to reduce water and carbon consumption. Overall, the content of total nonstructural carbohydrates (NSC) and their components in the stem were generally comparable to or higher than those in the rainy season in three of the four species. Because the leaves were turgor-less for most time during the drought, high NSC levels during the drought could be due to recycling of NSC from dead branches or translocation from roots. Our results suggest high tolerance of savanna shrub species to extreme drought, which could be facilitated by high embolism resistance in some stems and shedding of vulnerable branches to maintain individual water and carbon balance.</p>2022-04-25T03:14:41ZA new isotope framework to decipher leaf-root nitrogen allocation and assimilation among plants in a tropical invaded ecosystemHu, Chao-ChenLiu, Xue-YanYan, Ya-XinLei, Yan-BaoTan, Yun-HongLiu, Cong-Qianghttp://www.irgrid.ac.cn:8080/handle/1471x/71422522022-05-06T17:30:26Z2022-04-25T03:14:40Z题名: A new isotope framework to decipher leaf-root nitrogen allocation and assimilation among plants in a tropical invaded ecosystem
作者: Hu, Chao-Chen; Liu, Xue-Yan; Yan, Ya-Xin; Lei, Yan-Bao; Tan, Yun-Hong; Liu, Cong-Qiang
摘要: Exotic plant invasion is an urgent issue occurring in the biosphere, which can be stimulated by environmental nitrogen (N) loading. However, the allocation and assimilation of soil N sources between leaves and roots remain undear for plants in invaded ecosystems, which hampers the understanding of mechanisms behind the expansion of invasive plants and the co-existence of native plants. This work established a new framework to use N concentrations and isotopes of soils, roots, and leaves to quantitatively decipher infra-plant N allocation and assimilation among plant species under no invasion and under the invasion of Chromolaena odorata and Ageratina adenophora in a tropical ecosystem of SW China. We found that the assimilation of N derived from both soil ammonium (NH4+) and nitrate (NO3-) were higher in leaves than in roots for invasive plants, leading to higher leaf N levels than native plants. Compared with the same species under no invasion, most native plants under invasion showed higher N concentrations and NH4+ assimilations in both leaves and roots, and increases in leaf N were higher than in root N for native plants under invasion. These results inform that preferential N allocation, dominated by NH4+-derived N. to leaves over roots as an important N-use strategy for plant invasion and co-existence in the studied tropical ecosystem. (C) 2021 Elsevier B.V. All rights reserved.2022-04-25T03:14:40ZTropical deciduous forest in Yunnan, southwestern China: Implications for geological and climatic histories from a little-known forest formationZhu, HuaAshton, PeterGu, BojianZhou, ShisunTan, Yunhonghttp://www.irgrid.ac.cn:8080/handle/1471x/71421912022-05-06T17:30:26Z2022-04-25T03:14:39Z题名: Tropical deciduous forest in Yunnan, southwestern China: Implications for geological and climatic histories from a little-known forest formation
作者: Zhu, Hua; Ashton, Peter; Gu, Bojian; Zhou, Shisun; Tan, Yunhong
摘要: <p>In the southern mountain ranges of Yunnan province, China, deep valleys of several large rivers create rain shadows with hot dry summers, and are locally designated tropical; towards the north, notably in the Lancang (Upper Mekong) valley, these regions may experience frost during winter. The woody forest canopy of these valleys is predominantly deciduous, with evergreen elements in the north, where the canopy is open and the forest savanna-like. However, we here present tall forest with a closed deciduous canopy and semi-evergreen subcanopy observed in hot dry valleys of these rivers and their tributaries in the tropical south. The structure and physiognomy of these forests resemble the tall (moist) deciduous forest formation widespread in South Asia and Indo-Burma. Furthermore, these forests are largely composed of tropical elements at both the generic (80%) and the species level (>70%), indicating that these forests are indeed tropical. We originally hypothesized that these isolated forests represent refugia of a pre-Holocene extension of tall (moist) deciduous forest formation of South Asia and Indo-Burma. The sample plot we established to test this hypothesis confirmed that these forests share the structure and physiognomy of the tall (moist) deciduous forest formation; however, the plots also showed that these forests lack the characteristic and dominant species of the formation's Indo-Burmese range. The tree flora, in particular, indicates that both deciduous and evergreen elements are instead mostly derived from the adjacent tropical semi-evergreen forests of tropical southern China; yet they also include an important endemic element, which implies that these forests have survived as refuges possibly since the Pliocene. The exceptional representation of evergreen elements in these forests indicates that they have rarely been subject to hot fires or domestic cattle browsing, adding to the unique nature of the forests and further justifying their strict conservation. Copyright (c) 2021 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).</p>2022-04-25T03:14:39ZEstimating the Potential Impacts of Climate Change on the Spatial Distribution of Garuga forrestii, an Endemic Species in ChinaTiamiyu, Bashir B.Ngarega, Boniface K.Zhang, XuZhang, HuajieKuang, TianhuiHuang, Gui-YunDeng, TaoWang, Hengchanghttp://www.irgrid.ac.cn:8080/handle/1471x/71422512022-05-06T17:30:26Z2022-04-25T03:14:38Z题名: Estimating the Potential Impacts of Climate Change on the Spatial Distribution of Garuga forrestii, an Endemic Species in China
作者: Tiamiyu, Bashir B.; Ngarega, Boniface K.; Zhang, Xu; Zhang, Huajie; Kuang, Tianhui; Huang, Gui-Yun; Deng, Tao; Wang, Hengchang
摘要: Understanding how species have adapted and responded to past climate provides insights into the present geographical distribution and may improve predictions of how biotic communities will respond to future climate change. Therefore, estimating the distribution and potentially suitable habitats is essential for conserving sensitive species such as Garuga forrestii W.W.Sm., a tree species endemic to China. The potential climatic zones of G. forrestii were modelled in MaxEnt software using 24 geographic points and nine environmental variables for the current and future (2050 and 2070) conditions under two climate representative concentration pathways (RCP4.5 and RCP8.5) scenarios. The resulting ecological niche models (ENMs) demonstrated adequate internal assessment metrics, with all AUC and TSS values being >0.79 and a pROC of >1.534. Our results also showed that the distribution of G. forrestii was primarily influenced by temperature seasonality (% contribution = 12%), elevation (% contribution = 27.5%), and precipitation of the wettest month (% contribution = 35.6%). Our findings also indicated that G. forrestii might occupy an area of 309,516.2 km(2) in southwestern China. We note that the species has a potential distribution in three provinces, including Yunnan, Sichuan, and Guangxi. A significant decline in species range is observed under the future worst case of high-emissions scenario (RCP8.5), with about 19.5% and 20% in 2050 and 2070, respectively. Similarly, higher elevations shift northward to southern parts of Sichuan province in 2050 and 2070. Thus, this study helps highlight the vulnerability of the species, response to future climate and provides an insight to assess habitat suitability for conservation management.2022-04-25T03:14:38ZGrowth-Climate Relationships and Long-Term Growth Trends of the Tropical Forest Tree Choerospondias axillaris (Anacardiaceae) in East-Central ThailandSurayothee, WisawakornBuajan, SupapornFu, PeiliPumijumnong, NathsudaFan, ZexinPanthi, ShankarFinnegan, Patrick M.Zhang, YongjiangChen, YajunTor-ngern, PantanaChanthorn, WirongNathalang, AnuttaraBrockelman, Warren Y.http://www.irgrid.ac.cn:8080/handle/1471x/71422502022-05-06T17:30:26Z2022-04-25T03:14:37Z题名: Growth-Climate Relationships and Long-Term Growth Trends of the Tropical Forest Tree Choerospondias axillaris (Anacardiaceae) in East-Central Thailand
作者: Surayothee, Wisawakorn; Buajan, Supaporn; Fu, Peili; Pumijumnong, Nathsuda; Fan, Zexin; Panthi, Shankar; Finnegan, Patrick M.; Zhang, Yongjiang; Chen, Yajun; Tor-ngern, Pantana; Chanthorn, Wirong; Nathalang, Anuttara; Brockelman, Warren Y.
摘要: Tropical forests play important roles in global carbon cycling. Tree-ring analysis can provide important information for understanding long-term trends in carbon-fixation capacity under climate change. However, tree-ring studies in tropical regions are limited. We carried out a tree-ring analysis to investigate the dendrochronological potential of the tropical forest tree Choerospondias axillaris (Anacardiaceae) in east-central Thailand. Our study focused on growth-climate relationships and long-term growth trends. A chronology was constructed covering the period from 1932 to 2019. The tree-ring width index of C. axillaris was positively correlated with precipitation in June, July, and October. Furthermore, growth of C. axillaris was positively correlated with the Standardized Precipitation-Evapotranspiration Index (SPEI) from July to October, indicating that growth of C. axillaris is mainly limited by moisture availability in the late monsoon season. Moving correlation analysis further revealed the consistency and temporal stability of the relationship of tree growth with monsoon season precipitation and SPEI during the period under study. There was a significant increasing trend in long-term growth from 1932 to 2002 (slope = 0.017, p < 0.001); however, long-term growth decreased from 2003 to 2019 (slope = -0.014, p < 0.001). Our study provides important insight into the growth-climate correlations of a broad-leaved tree species in a dry evergreen forest in tropical Asia.2022-04-25T03:14:37ZDifferent environmental factors drive tree species diversity along elevation gradients in three climatic zones in Yunnan, southern ChinaSong, XiaoyangCao, MinLi, JieqiongKitching, Roger L.Nakamura, AkihiroLaidlaw, Melinda J.Tang, YongSun, ZhenhuaZhang, WenfuYang, Jiehttp://www.irgrid.ac.cn:8080/handle/1471x/71421552022-05-06T17:30:26Z2022-04-25T03:14:36Z题名: Different environmental factors drive tree species diversity along elevation gradients in three climatic zones in Yunnan, southern China
作者: Song, Xiaoyang; Cao, Min; Li, Jieqiong; Kitching, Roger L.; Nakamura, Akihiro; Laidlaw, Melinda J.; Tang, Yong; Sun, Zhenhua; Zhang, Wenfu; Yang, Jie
摘要: <p>Elevational patterns of tree diversity are well studied worldwide. However, few studies have examined how seedlings respond to elevational gradients and whether their responses vary across climatic zones. In this study, we established three elevational transects in tropical, subtropical and subalpine mountain forests in Yunnan Province, southern China, to examine the responses of tree species and their seedlings to elevational gradients. Within each transect, we calculated species diversity indices and composition of both adult trees and seedlings at different elevations. For both adult trees and seedlings, we found that species diversity decreased with increasing elevation in both tropical and subalpine transects. Species composition showed significant elevational separation within all three transects. Many species had specific elevational preferences, but abundant tree species that occurred at specific elevations tended to have very limited recruitment in the understory. Our results highlight that the major factors that determine elevational distributions of tree species vary across climatic zones. Specifically, we found that the contribution of air temperature to tree species composition increased from tropical to subalpine transects, whereas the contribution of soil moisture decreased across these transects. Copyright (C) 2021 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.</p>2022-04-25T03:14:36ZHigh frequency of arthropod herbivore damage in the Miocene Huaitoutala flora from the Qaidam Basin, northern Tibetan PlateauLi, QijiaDeng, WeiyudongWappler, TorstenUtescher, TorstenMaslova, NataliaLiu, Yusheng (Christopher)Jia, HuiSong, ChengyuSu, TaoQuan, Chenghttp://www.irgrid.ac.cn:8080/handle/1471x/71421682022-05-06T17:30:26Z2022-04-25T03:14:35Z题名: High frequency of arthropod herbivore damage in the Miocene Huaitoutala flora from the Qaidam Basin, northern Tibetan Plateau
作者: Li, Qijia; Deng, Weiyudong; Wappler, Torsten; Utescher, Torsten; Maslova, Natalia; Liu, Yusheng (Christopher); Jia, Hui; Song, Chengyu; Su, Tao; Quan, Cheng
摘要: <p>Plant-arthropod interaction offers insight into the evolution of terrestrial ecosystems in the geological past. In this study, leaf fossils with arthropod traces, collected from the Miocene Huaitoutala flora, Qaidam Basin, northern Tibetan Plateau, were studied to provide direct evidence of plant-arthropod interactions on the Tibetan Plateau. The results show a total of 36 damage types belonging to eight different functional feeding groups, classified on 303 out 01433 leaf specimens with a damage frequency of 70%. Compared to other Miocene fossil floras worldwide, the Huaitoutala flora represents a relatively high frequency and diversity of damage. It indicates that, apart from climatic factors, the influence of local niche and biotic factors might have contributed to the intensive plantarthropod interactions observed at that time, suggesting that the Miocene ecosystem hereof was not as barren as previously thought. (C) 2021 Elsevier B.V. All rights reserved.</p>2022-04-25T03:14:35ZFossil fruits of Firmiana and Tilia from the middle Miocene of South Korea and the efficacy of the Bering land bridge for the migration of mesothermal plantsJia, Lin-BoNam, Gi-SooSu, TaoStull, Gregory W.Li, Shu-FengHuang, Yong-JiangZhou, Zhe-Kunhttp://www.irgrid.ac.cn:8080/handle/1471x/71421672022-05-06T17:30:26Z2022-04-25T03:14:33Z题名: Fossil fruits of Firmiana and Tilia from the middle Miocene of South Korea and the efficacy of the Bering land bridge for the migration of mesothermal plants
作者: Jia, Lin-Bo; Nam, Gi-Soo; Su, Tao; Stull, Gregory W.; Li, Shu-Feng; Huang, Yong-Jiang; Zhou, Zhe-Kun
摘要: <p>Determining whether the high-latitude Bering land bridge (BLB) was ecologically suitable for the migration of mesothermal plants is significant for Holarctic phytogeographic inferences. Paleobotanical studies provide a critical source of data on the latitudinal positions of different plant lineages at different times, permitting assessment of the efficacy of the BLB for migration. Here we report exceptionally preserved fossils of Firmiana and Tilia endochrysea from the middle Miocene of South Korea. This represents a new reliable record of Firmiana and the first discovery of the T. endochrysea lineage in the fossil record of Asia. The occurrence of these fossils in South Korea indicates that the two lineages had a distribution that extended much farther north during the middle Miocene, but they were still geographically remote from the BLB. In light of the broader fossil record of Asia, our study shows that, in the middle Miocene, some mesothermal plants apparently inhabited the territory adjacent to the BLB and thus they were possibly capable of utilizing the BLB as a migratory corridor. Some other mesothermal plants, such as Firmiana and the T. endochrysea lineages, however, are restricted to more southern regions relative to the BLB based on current fossil evidence. These lineages may have been ecologically unable to traverse the BLB, which raises questions about the efficacy of the BLB as a universal exchange route for mesothermal plants between Asia and North America during the middle Miocene. Copyright (c) 2020 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).</p>2022-04-25T03:14:33ZHomogenized Phylogeographic Structure across the Indo-Burma Ranges of a Large Monoecious Fig, Ficus altissima BlumeHuang, Jian-FengDarwell, Clive T.Peng, Yan-Qionghttp://www.irgrid.ac.cn:8080/handle/1471x/71421602022-05-06T17:30:26Z2022-04-25T03:14:32Z题名: Homogenized Phylogeographic Structure across the Indo-Burma Ranges of a Large Monoecious Fig, Ficus altissima Blume
作者: Huang, Jian-Feng; Darwell, Clive T.; Peng, Yan-Qiong
摘要: <p>As well as bountiful natural resources, the Indo-Burma biodiversity hotspot features high rates of habitat destruction and fragmentation due to increasing human activity; however, most of the Indo-Burma species are poorly studied. The exploration of plants closely associated with human activity will further assist us to understand our influence in the context of the ongoing extinction events in the Anthropocene. This study, based on widely and intensively sampled F. altissima across Indo-Burma and the adjacent south China ranges, using both the chloroplast psbA-trnH spacer and sixteen newly developed nuclear microsatellite markers (nSSRs), aims to explore its spatial genetic structure. The results indicated low chloroplast haplotype diversity and a moderate level of nuclear genetic diversity. Although limited seed flow was revealed by psbA-trnH, no discernible phylogeographic structure was shown due to the low resolution of cpDNA markers and dominance of an ancestral haplotype. From the nSSRs data set, phylogeographic structure was homogenized, most likely due to extensive pollen flow mediated by pollinating fig wasps. Additionally, human cultivation and human-mediated transplanting further confounded the analyses of population structure. No geographic barriers are evident across the large study range, with F. altissima constituting a single population, and extensive human cultivation is likely to have had beneficial consequences for protecting the genetic diversity of F. altissima.</p>2022-04-25T03:14:32ZSoil microplastic pollution under different land uses in tropics, southwestern ChinaXu, GuoruiYang, LeiXu, LiYang, Jiehttp://www.irgrid.ac.cn:8080/handle/1471x/71421542022-05-06T17:30:26Z2022-04-25T03:14:31Z题名: Soil microplastic pollution under different land uses in tropics, southwestern China
作者: Xu, Guorui; Yang, Lei; Xu, Li; Yang, Jie
摘要: <p>Terrestrial ecosystems encounter emerging risks of microplastic (MP) pollution. However, the distribution characteristics of soil MPs across different land uses in tropical areas have remain largely unknown. We sampled soils from two natural ecosystems (primary and secondary forests) and two artificial ecosystems (rubber and banana plantations) in tropical region of southwestern China. We aimed to evaluate the overall characteristics of soil MPs and analyze the distribution and source of MPs in different soil layers and land uses. We found that the dominant size of soil MPs were <1 mm and the major shapes were fragments and fibres, with colours blue, yellow, and green-blue. Most MPs were polyethylene (PE, 59.6%), rayon (RY, 12.0%), and polypropylene (PP, 10.9%). In artificial ecosystems, the abundance of MPs in the top soil (0-10 cm) was approximately 2.5 times that of in deep soil (10-20 cm), whereas it was only 50% in the natural ecosystems. The abundance of MPs in banana plantations reached as high as 10975.0 +/- 261.0 particles kg(-1) (p kg(-1)), which was about 10 times that of in rubber plantations (1112.5 +/- 151.6 p kg(-1)) and 18 times of those in secondary and primary forests (612.5 +/- 119.2 p kg(-1) and 637.5 +/- 181.6 p kg(-1)). Anthropogenic and atmospheric transport may be the major sources of soil MPs for artificial ecosystems to natural ecosystems, respectively. Our results revealed the widespread presence of soil MPs in tropical areas, from artificial ecosystems to natural ecosystems, in both the top and deep soil layers. MP pollution in artificial ecosystems is considerably serious than that in natural ecosystems. Our study provides important support for further research on ecosystem risks pertaining to MPs in the context of land use changes, and promotes the development of effective measures and policies to control MP pollution in tropical areas.</p>2022-04-25T03:14:31Z