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How topography and neighbor shape the fate of trees in subtropical forest restoration:Environmental filtering and resource competition drive natural regeneration

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Forest Ecosystems 2024年第1期11卷 73-86页

作者： Haonan Zhang Xingshuo Zhang Yingying Lv Yanyan Ni Baokun Xu Xiangnan Han Xiao Cao Qingpei Yang Wanggu Xu Zhedong Qian Innovative Research Team for Forest restoration Mechanisms Nanjing Institute of Environmental SciencesMinistry of Ecology and Environment(MEE)Nanjing 210042China College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

The structure of plant communities at local scales depends on both the spatial heterogeneity of abiotic environmental factors and the biotic interactions within the community.However,although environmental filtering due to microtopographic heterogeneity and resource competition among plants caused by spatial variation in tree density and size are considered to be very important in explaining the mechanisms of community assembly,their effects on the processes of individual mortality and recruitment in natural forest regeneration,as well as their relative contributions,are still poorly understood.To address this,we established a 12-ha permanent plot in a subtropical evergreen broad-leaved forest area and measured microtopographic variables such as elevation,slope,aspect,and terrain position index(TPI)using a total station.We monitored the individual mortality and recruitment in forest natural regeneration through repeated surveys at 5-year intervals.We fitted spatial covariance models to jointly use multiple factors from three groups of variables(microtopographic effect,neighborhood density effects,neighborhood size effects)as explanatory variables to analyze their roles in driving the mortality and recruitment of all individual and 12 dominant species in forest natural regeneration at the neighborhood scale.Our results show that:(1)In the crucial early stages of secondary forest restoration,natural regeneration is influenced by a synergy of environmental filtering,due to microtopographic heterogeneity,and resource competition among plants.(2)For distinct species responses,evergreen dominant species'mortality is largely explained by neighborhood effects,while deciduous species are more affected by topographic factors.Furthermore,the adverse effects of larger conspecific trees on younger trees indicate a pattern of competitive pressure leading to mortality among regenerating trees,such pattern emphasis the influence of parent trees on natural regeneration.(3)As trees grow,their interaction with these stressors evolv

关键词： Natural regeneration Microtopography Neighborhood effects Mortality and recruitment

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Effect of reforestation on annual water yield in a large watershed in northeast China

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Journal of Forestry Research 2015年第3期26卷 697-702页

作者： Yuefeng Yao Tijiu Cai Cunyong Ju Chengxin He guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of Botany School of Forestry Northeast Forestry University

A simplified water balance model in conjunc- tion with an evapotranspiration （ET） model and cumulative forest cover data were used to quantify the changes in annual water yield in response to reforestation in a large watershed, northeast China. Cumulative forest cover increased by 22 %, leading to a significant decrease in estimated annual water yield. Reforestation increased ET （P = 0.0144）, resulting in a remarkable decrease （P = 0.0001） in estimated annual water yield according to the water balance model. Reforestation increased ET by 33 mm and decreased annual water yield by 38 mm per decade. The effect of reforestation on annual water yield can be quantified using a simplified water balance model in a large watershed, although our reforestation area was small （about 20 %） in relation to the total watershed area.

关键词： Annual water yield Cumulative forestcover Evapotranspiration （ET） Reforestation Water balance model

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亚热带本地植物群落中增加降水扩大了氮增加对入侵植物表现的影响

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Journal of plant ecology 2022年第3期15卷 473-484页

作者： Xiang-Qin Li Sai-Chun Tang Yu-Mei Pan Chun-Qiang Wei Shi-Hong Lü guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of BotanyGuangxi Zhuang Autonomous Region and Chinese Academy of SciencesGuilin 541006China Zhejiang Provincial key laboratory of plant Evolutionary ecology and conservation Taizhou UniversityTaizhou 318000China

氮沉降、降水以及它们的交互作用会影响氮和水是限制性资源的温带生态系统中的外来植物入侵,但它们是否会影响以及怎样影响外来植物在富氮和降水丰富的亚热带植物群落中的入侵,仍不清楚。本研究在亚热带生态系统中,在野外用12种常见本... 详细信息

氮沉降、降水以及它们的交互作用会影响氮和水是限制性资源的温带生态系统中的外来植物入侵,但它们是否会影响以及怎样影响外来植物在富氮和降水丰富的亚热带植物群落中的入侵,仍不清楚。本研究在亚热带生态系统中,在野外用12种常见本地植物构建群落,将4种入侵植物及其近缘的4种本地植物分别引入到群落中,对群落进行氮添加(0和5 g N m^(−2) a^(−1))和降水增加(自然降水和增加降水30%)交互处理,比较了引入的入侵植物和近缘本地植物在群落中的生长和定居表现以及群落特征(包括群落密度和地上生物量等)。研究结果显示,只增加降水没有提高入侵植物或近缘本地植物的表现;氮添加仅提高入侵植物地上生物量和相对密度;氮和降水同时增加提高了入侵植物和近缘本地植物在群落中的生长和定居表现。在氮添加、降水增加和氮与降水同时增加处理下,入侵植物的大多数生长和定居参数高于近缘本地植物。在氮与降水同时增加时,入侵植物所定居本地群落的密度和地上生物量显著低于近缘本地植物所定居本地群落的密度和地上生物量。这些结果说明,在富氮和降水丰富的亚热带本地群落中,降水增加扩大了氮增加对入侵植物表现的影响。这将有助于理解在富氮和降水丰富的亚热带生态系统中,全球变化对植物入侵的影响。

关键词：群落地上生物量群落密度生长和定居降水增加入侵植物氮添加亚热带本地群落

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Beyond direct neighbourhood effects: higher-order interactions improve modelling and predicting tree survival and growth

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National Science Review 2021年第5期8卷 38-47页

作者： Yuanzhi Li Margaret M.Mayfield Bin Wang Junli Xiao Kamil Kral David Janik Jan Holik Chengjin Chu Department of ecology State Key Laboratory of BiocontrolSchool of Life SciencesSun Yat-sen University guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of BotanyGuangxi Zhuang Autonomous Region and Chinese Academy of Sciences Department of Silviculture Faculty of Forestry and Wood TechnologyMendel University in Brno School of Biological Sciences The University of Queensland Department of Forest ecology Silva Tarouca Research Institute

It is known that biotic interactions are the key to species coexistence and maintenance of species diversity.Traditional studies focus overwhelmingly on pairwise interactions between organisms, ignoring complex higher-order interactions(HOIs). In this study, we present a novel method of calculating individual-level HOIs for trees, and use this method to test the importance of size-and distance-dependent individual-level HOIs to tree performance in a 25-ha temperate forest dynamic plot. We found that full HOI-inclusive models improved our ability to model and predict the survival and growth of trees, providing empirical evidence that HOIs strongly influence tree performance in this temperate forest. Specifically, assessed HOIs mitigate the competitive direct effects of neighbours on survival and growth of focal trees. Our study lays a foundation for future investigations of the prevalence and relative importance of HOIs in global forests and their impact on species diversity.

关键词： pairwise interactions indirect interactions density-dependent size- and distance-dependent Zofin Forest Dynamic Plot

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Phylotranscriptomics in Cucurbitaceae Reveal Multiple Whole-Genome Duplications and key Morphological and Molecular Innovations

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Molecular plant 2020年第8期13卷 1117-1133页

作者： Jing Guo Weibin Xu Yi Hu Jie Huang Yiyong Zhao Lin Zhang Chien-Hsun Huang Hong Ma Ministry of Education key laboratory of Biodiversity Sciences and Ecological Engineering and State key laboratory of Genetic Engineering Institute of Biodiversity Sciences and Institute of Plant BiologySchool of Life SciencesFudan University2005 Songhu RoadShanghai 200438China guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of BotanyGuangxi Zhuangzu Autonomous Region and Chinese Academy of SciencesGuilin 541006China Department of Biology the Huck Institutes of Life Sciencesthe Pennsylvania State UniversityUniversity ParkPA 16802USA

The ability of climbing plants to grow upward along others to reach the canopy for photosynthesis is hypothesized as a key innovation in flowering plants.Most members of the Cucurbitaceae,a family containing^1000 species and many important crops,are climbers and have characteristic tendrils and pepo fruits.Here,we present 127 newly sequenced transcdptomes and genomes along with other datasets for a total of 136 cucurbits representing all tribes to establish a robust Cucurbitaceae phylogeny containing eight highly resolved major clades.We analyzed whole-genome duplication,diversification dynamics,and ancestral morphologies,and found that after early genome duplication event(s),a burst of diversification and morphological innovations in flower,fruit,and root characters occurred under the climate optimum in the Early Eocene.Species radiation during the Mid-Eocene Climatic Optimum also coincided with several morphological changes shared by 80%of cucurbits.We found that the cucurbit-specific tendril identity gene TEN originated from a paleo-polyploidization event at the origin of the family.Our results support the hypothesis that cucurbit diversifications were probably driven by increased genetic diversity following polyploidizations and by trait morphological innovations under paleo-climate upheavals.Our study provides a phylogenetic framework and new insights into morphological and genomic changes underlying the adaptive evolution of Cucurbitaceae.

关键词： Cucurbitaceae transcriptome phylogeny divergence time genome duplication diversification morphology adaptive evolution

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Habitat restoration is the greatest challenge for population recovery of Hainan gibbons(Nomascus hainanus)

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Integrative Zoology 2023年第4期18卷 630-646页

作者： Qingqing HE Shasha YAN Paul A.GARBER Baoping REN Xvming QI Jiang ZHOU School of karst Science Guizhou Normal UniversityGuiyangChina Department of Anthropology University of IllinoisUrbanaIllinoisUSA Ministry of Education key laboratory for ecology of Tropical Islands Key Laboratory of Tropical Animal and Plant Ecology of Hainan ProvinceCollege of Life SciencesHainan Normal UniversityHaikouChina Bawangling Branch Hainan Tropic Rainforest National Park AdministrationChina

Hainan gibbons are among the world’s most critically endangered primates,with a remaining population of only 35 individuals distributed across 5 social groups in the Bawangling Branch of the Hainan Tropical Rainforest National Park,China.Habitat conversion and forest fragmentation over the past 40 years have reduced their geographical distribution by 95%.In the absence of a quantitative assessment of the availability of remaining suitable habitat,it is unclear whether this species can survive to the end of this century.We used behavioral observations,ArcGIS,remote sensing,stereo optical imagery,and MaxEnt modeling to identify patterns of Hainan gibbon range use and compare changes in the distribution of suitable forest types and areas of forest fragmentation over the past 20 years(2000–2020).The results indicate that the combined range of the 5 extant Hainan gibbon groups totaled 14.89 km2.The home range of the smallest group(Group E,3 individuals)was 1.51 km2,which likely represents the minimum home range size for this species.The remaining area of highly suitable and moderately suitable habitat totals 26.9 km2.However,habitat connectivity across the gibbon range is very low(less than 0.5),limiting the ability of Hainan gibbons to move between forest patches.The results of this study indicate that the availability of suitable habitat in Bawangling is insufﬁcient to allow for future Hainan gibbon population growth.Therefore,immediate action must be taken to restore,reforest,and establish ecological corridors to reconnect areas of suitable habitat for these critically endangered gibbons.

关键词： conservation Hainan gibbon home range area landscape management MaxEnt modeling

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Nuclear phylogeny and insights into wholegenome duplications and reproductive development of Solanaceae plants

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plant Communications 2023年第4期4卷 301-322页

作者： Jie Huang Weibin Xu Junwen Zhai Yi Hu Jing Guo Caifei Zhang Yiyong Zhao Lin Zhang Christopher Martine Hong Ma Chien-Hsun Huang State key laboratory of Genetic Engineering and Collaborative Innovation Center of Genetics and Development Ministry of Education Key Laboratory of Biodiversity and Ecological EngineeringInstitute of Plant BiologyCenter of Evolutionary BiologySchool of Life SciencesFudan UniversityShanghai 200438China guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of BotanyGuangxi Zhuangzu Autonomous Region and Chinese Academy of SciencesGuilin 541006China key laboratory of National Forestry and Grassland Administration for Orchid conservation and Utilization Fujian Agriculture and Forestry UniversityFuzhou 350002China Department of Biology the Huck Institutes of Life Sciencesthe Pennsylvania State UniversityUniversity ParkState CollegePA 16802USA Department of Biology Bucknell UniversityLewisburgPA 17837USA

Solanaceae,the nightshade family,have2700 species,including the important crops potato and tomato,ornamentals,and medicinal plants.Several sequenced Solanaceae genomes show evidence for wholegenome duplication(WGD),providing an excellent opportunity to investigate WGD and its impacts.Here,we generated 93 transcriptomes/genomes and combined them with 87 public datasets,for a total of 180 Solanaceae species representing all four subfamilies and 14 of 15 tribes.Nearly 1700 nuclear genes from these transcriptomic/genomic datasets were used to reconstruct a highly resolved Solanaceae phylogenetic tree with six major clades.The Solanaceae tree supports four previously recognized subfamilies(Goetzeioideae,Cestroideae,Nicotianoideae,and Solanoideae)and the designation of three other subfamilies(Schizanthoideae,Schwenckioideae,and Petunioideae),with the placement of several previously unassigned genera.We placed a Solanaceae-specific whole-genome triplication(WGT1)at81 million years ago(mya),before the divergence of Schizanthoideae from other Solanaceae subfamilies at73 mya.In addition,we detected two gene duplication bursts(GDBs)supporting proposed WGD events and four other GDBs.An investigation of the evolutionary histories of homologs of carpel and fruit developmental genes in 14 gene(sub)families revealed that 21 gene clades have retained gene duplicates.These were likely generated by the Solanaceae WGT1 and may have promoted fleshy fruit development.This study presents a well-resolved Solanaceae phylogeny and a new perspective on retained gene duplicates and carpel/fruit development,providing an improved understanding of Solanaceae evolution.

关键词： Solanaceae phylogeny transcriptome carpel and fruit development whole-genome duplication

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Drivers of soil erosion and subsurface loss by soil leakage during karst rocky desertification in SW China

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International Soil and Water conservation Research 2022年第2期10卷 217-227页

作者： Xudong Peng Quanhou Dai College of Forestry Guizhou UniversityGuiyang550025China Institute of Soil Erosion and Ecological restoration Guizhou UniversityGuiyang550025China The key laboratory of plant Resource conservation and Germplasm Innovation in Mountainous Region(Ministry of Education) Collaborative Innovation Center for Mountain Ecology&Agro-Bioengineering(CICMEAB)Research Center of Soil Erosion and Ecological RestorationGuizhou UniversityGuiyang550025China

As an extreme manifestation of environmental degradation,karst rock desertification is caused by soil loss and rock exposure.In some areas with serious rocky desertification,there is no soil to be eroded or leaked.The soil loss in these areas superimposes soil erosion and unique subsurface loss by soil leakage through fissures,pipelines,sinkholes,etc.,which directly reduce soil resources and accelerate rocky desertification.However,the factors driving soil erosion and subsurface loss by soil leakage are still unclear.Rainfall experiments were conducted on simulated slopes with surface-exposed bedrock and subsurface fissures based on field investigations in a karst rocky desertification area of Guizhou Province,China.Four factors,including rainfall intensity,slope gradient,bedrock exposure rate and subsurface fissure degree,were considered in the experiment.We found that the amount of soil surface erosion and subsurface leakage loss is driven not only by the runoff volume but also by other influential factors.Rainfall intensity is the driving factor determining the amount of surface erosion and subsurface leakage loss of soil and water and the relationship between them.The slope gradient plays a leading role only in subsurface fissure flow leakage loss.The bedrock exposure rate drives the surface soil erosion rate,shows a critical value(30%),and dominates the fissure flow leakage loss rate.Subsurface fissure density plays an important role in the surface loss of soil and water;however,an increase in the subsurface fissure density does not obviously accelerate the subsurface leakage loss of soil and water.Although this result,obtained from laboratory simulations,may differ at the field scale or larger,it could provide a foundation for systematic studies on soil erosion/leakage and insights into the relations between rocky desertification and soil erosion/leakage and their driving factors in karst rocky desertification.

关键词： Driving factors karst rocky desertification Soil erosion Subsurface leakage Southwest China

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Topographic species-habitat associations of tree species in a heterogeneous tropical karst seasonal rain forest, China

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Journal of plant ecology 2017年第3期10卷 450-460页

作者： Yili Guo Bin Wang Azim U.Mallik Fuzhao Huang Wusheng Xiang Tao Ding Shujun Wen Shuhua Lu Dongxing Li Yunlin He Xiankun Li guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of BotanyGuangxi Zhuang Autonomous Region and Chinese Academy of SciencesGuilin 541006China guangxi Youyiguan Forest Ecosystem National Research Station Pingxiang 532600China Department of Biology Lakehead UniversityThunder BayOntario P7B 5E1Canada

Aims Tropical and subtropical karst forests of south China are under increas-ing pressure from over-exploitation causing widespread habitat degra-dation and biodiversity loss.Previous research has demonstrated that topography,as a proxy for resource availability,plays an important role in shaping tree species distributions in tropical forests.However,the association between growth stages and habitats types has not been considered in this analysis.Our aim was to examine the differences among different habitat types to determine whether tree species show similar species-habitat associations at young and mature life stages.Methods We used multivariate regression tree analysis to examined species-habitat associations among eight topographically defined habitats.The results were tested with a torus-translation test and canonical correspondence analysis(CCA)for 74 species in a 15 ha karst tropi-cal seasonal rain forest at the Nonggang National Natural Reserve in south China.We considered two life stages(young and mature)of trees species that showed a positive association with topography.Important Findings We found marked differences in community characteristics and number of associations among the eight habitats.Of the 74 species subjected to torus-translation test,63 had significant positive and 70 had significant negative associations with one or more of the eight habitats.Positive associations were more frequent in higher elevation habitats and negative associations were more frequent in lower eleva-tion habitats.This suggests that edaphic and hydrological variation related to topography play important roles in habitat partitioning in heterogeneous karst forests.For the 63 tree species with significant positive associations to at least one habitat,40 of them had the same positive association at young and mature life stages.The CCA revealed that the six topographic variables considered had consistent relation-ships with species distribution among all individuals and their two life stages.This indicates that most of t

关键词： multivariate regression tree torus-translation test canonical correspondence analysis niche differentiation dispersal limitation environmental heterogeneity

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Productivity and the Survival Rate after Winter Management of Seven Tropical Forage Accessions in Subtropical Region of China

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Agricultural Sciences 2017年第5期8卷 451-464页

作者： Chengxin He Ling Mo Yuqing Huang Zhongfeng Zhang Michael Hare Danjuan Zen Gaozhong Pu guangxi key laboratory of plant conservation and restoration ecology in karst terrain Guangxi Institute of Botany CAS Guilin China Faculty of Agriculture Ubon Ratchathani University Ubon Ratchathani Thailand

Forage production and quality of five tropical grass accessions (Guimu-1 hybrid elephant grass (PG1), Mulato II (M II), Ubon paspalum (PU), hybrid elephant grass (PH) and Reyan 11 paspalum (PR11)) and two tropical legume accessions (Reyan 5 stylo (SR5) and Ubon stylo (SU)) were evaluated in a field experiment in a subtropical area with hot summers and cold winters in guangxi, China. Three forage stubble cover managements: no cover (CK), dry mass cover (MC) and plastic cover (PC) were applied at the end of the summer period to evaluate cold tolerance and accession survival over the winter. Photosynthesis measurements were taken from the forages in mid-summer. The results showed that PG1 accession produced significantly higher dry matter yields (67.0 t·ha-1) than the other grass and legume accessions. Legume accessions SU and SR5 produced much less dry matter (6.4 - 7.2 t·ha-1) compared to the grasses. M II, PU and PR11 contained the largest proportion of leaf. PG1 and PH showed good cold tolerance (survival rate >85%) under -1°C conditions without any cover management. PR11 had better cold tolerance than PU. M II exhibited very poor winter survival under no cover and with massive cover, and only survived well under plastic cover. The two stylo accessions died completely under all winter cover management treatments. In the growing season, under a given photosynthesis photon flux density (PPFD) = 1500 μmol m-2 s-1, the net photosynthesis rate Pn of all the seven accessions was above 28 μmol m-2 s-1, of which hybrid elephant grass and M II were above 42 μmol m-2 s-1. Though these 7 tropical accessions yielded high production in the grow season, stylo and M II are sensitive to cold in subtropical region of guangxi. The result suggests that PG1 and PU are good accessions and can be used as productive perennial pasture, while stylo and M II are simply considered as annual one. Additionally, if paspalum was trained in cool region before being introduced to subtropical region, it may present both productivity and enhanciv

关键词： Cold Tolerance Production Photosynthesis Tropical Grasses Winter

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