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| 1 | Influence of aerial seed banks on germination response in three desert plant species显示文摘Aims To determine if the germination response of desert plant species to a period of aerial storage in field conditions(i.e.mature seeds that remain attached to the parent plant)is comparable to seeds harvested at maturity and stored in ambient laboratory conditions,to better understand the role of aerial seed bank in the germina-tion ecology of desert plants,using one annual and two perennial species.Methods Seeds of three desert plants(Anastatica hierochuntica,Blepharis ciliaris and Scrophularia deserti)that matured in June 2014,were collected from wild plants in June and November 2014,and ger-minated under two photoperiods(0,12 hours light)and three ther-moperiods(night/day temperatures of 15/25,20/30 and 25/35°c).Important Findings Seeds of B.ciliaris and S.deserti had significantly higher germination percentages when harvested and stored for five months,compared to being stored in the aerial seed bank.Germination percentages of these two species increased with decreasing temperature and in the presence of light.These results indicate that these species use a com-bination of aerial and soil seed banks to maintain a percentage of viable seeds through favourable germination periods.Germination percentages of A.hierochuntica were high under all tested circum-stances,indicating that this species relies mainly on the aerial seed bank to maintain a percentage of viable seeds through favourable germination periods.This study shows that the population survival strategies of an aerial seed bank are species-specific.These results have practical implications for conservation and habitat restoration for these species,and also for their propagation since early collec-tion of mature fruits and ex situ storage will result in greater germi-nation percentages of some species. | Arvind Bhatt Prakash Chandra Phondani Shyam S.Phartyal Andrea Santo David Gallacher | 2017 | Journal of Plant Ecology2017，10，6： | 1 |
| 2 | Disturbance of plateau zokor-made mound stimulates plant community regeneration in the Qinghai-Tibetan Plateau, China显示文摘Mounds constructed by plateau zokors,which is widely distributed in alpine meadows significantly modified plant community structure.However,the variations of plant community structure under the disturbance of plateau zokor-made mound are less concerned.Therefore,we investigated the responses of plant community on zokor-made mound of different years(1 a and 3-4 a),and compared with undisturbed sites(no mound)in an alpine meadow in the eastern Qinghai-Tibetan Plateau(QTP),China.Species richness,coverage and Simpson diversity index were all significantly reduced by the presence of zokor-made mound,but plant heights were significantly increased,particularly in grasses and sedges.Several perennial forage species showed an increased importance value and niche breadth,including Koeleria macrantha,Elymus nutans and Poa pratensis.The effect of zokor-made mound on niche overlap showed that more intense interspecific competition produced a greater utilization of environmental resources.And this interspecific niche overlap was strengthened as succession progressed.The bare mound created by zokor burrowing activities provided a colonizing opportunity for non-dominant forage species,resulting in abundant plant species and plant diversity during the succession period.We concluded that presence of zokor-made mound was conducive to regeneration and vitality of plant community in alpine meadows,thus improving their resilience to anthropogenic stress. | XIANG Zeyu Arvind BHATT TANG Zhongbin PENG Yansong WU Weifeng ZHANG Jiaxin WANG Jingxuan David GALLACHER ZHOU Saixia | 2021 | Journal of Arid Land2021，13，10： | 0 |
| 3 | 深圳大沙河生态长廊显示文摘深圳的大沙河,发源于羊台山,纵贯深圳市南山区,全长13.7km,是一条传承着南山记忆的'母亲河',承载着周边居民的儿时美好回忆。然而,随着城市快速推进,大沙河两侧绿地逐步收紧,历经几次工程化改造之后由自然河川转变为了以城市排洪调蓄为主的功能性'渠道';随着经济的迅速发展及人口的急剧增加,大沙河接纳的污染负荷远远超过其自净能力,致使污染程度急剧增加,河水发黑、发臭。居民也渐渐忘却了伴水而居的乐趣,河道也不再与城市有任何对话。大沙河是深圳'四带六廊'基本生态格局中山脉支撑带(羊台山–梧桐山中部山脉)和滨海生态带之间的重要生态走廊。在大沙河的全面提升中,项目组秉持了生态优先的基本理念,在规划中采取了多角度的考量,务求寻找到一条综合解决之道,在确保大沙河的城市防洪功能的基础上,通过景观缝合碎片化的都市生态。 | 李立人 沈同生 David Gallacher 梁文盛 李颐 吴琨 顾为光 罗锦斌 庄学能 黄俊维 易可倩 胡睿珏 刘锡辉 梁丽 邱晓祥 李军 孙璐 达俏 潘万祥 祝冯敏 蒋超 张之菲 张学涛(摄) 无 | 2021 | 建筑实践2021，4，1： | 0 |
| 4 | Germination strategies of annual and short-lived perennial species in the Arabian Desert显示文摘Germination timing is highly regulated in short-lived plant species since it strongly influences recruitment success of vegetation.In deserts,the spatiotemporal distribution of plant-available water is highly episodic and unpredictable,making winter months more favorable for seed germination when other abiotic conditions co-occur.We hypothesized that changes in photoperiod and thermoperiod would impact germination more in seeds that had undergone in situ storage.We assessed 21 annual and short-lived perennial species in the Arabian Desert to find(1)if seeds were dormant at maturity,(2)if in situ seed storage increased germination percentage compared with no storage,(3)if photoperiod and thermoperiod germination requirements were influenced by in situ storage,and(4)if a phylogenetic association in seed germination could be observed.Seeds of each species collected in early 2017 were divided into two batches.One was tested for germination within one week(fresh seeds).The other was stored in situ at the maternal location(stored seeds)until October 2017 and tested for seed germination in the first week of November.Seed germination was conducted in incubators at two thermoperiods(15℃/20℃ and 20℃/30℃;12 h/12 h),and two photoperiods(12 and 0 h light per day).Results indicated that seed germination percentages of 13 species were significantly enhanced by in situ storage.A thermoperiod response was exhibited by stored,but not fresh seeds.Light exposure increased germination of fresh seeds but had only a minimal effect on stored seeds.Germination traits exhibited no phylogenetic correlation.This result indicated that selection pressure for germination strategy was stronger than that for taxonomic traits of these desert species. | Arvind BHATT David J GALLACHER Paulo R M SOUZA-FILHO | 2020 | Journal of Arid Land2020，12，6： | 0 |
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