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您的检索式：作者名="Zhaowan Shi"
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| 1 | Changes in ecological stoichiometry and nutrient resorption in Castanopsis hystrix plantations along an urbanization gradient in the lower subtropics显示文摘The stoichiometry of carbon,nitrogen and phosphorous in plants can reflect the interactions between plants and their environment.The interplay between plant nutrients,climatic factors,and soil properties and the underlying regulatory mechanisms are pillars of ecology but remain underexplored.In this study of plant C-N-P stoichiometry and nutrient resorption in Castanopsis hystrix groves in three cities(Guangzhou,Zhongshan,and Lechang)that represent an urban-rural gradient in Guangdong Province,South China,we explored potential relationships among NO_(2) concentrations,diameter at breast height(DBH),and resident human population.Mean annual temperature,mean annual precipitation,insolation duration per year,and the human resident population differed significantly among the three cities.Soil C-N-P was always highest in suburban Lechang,and the concentration of NO_(2) was highest in urban Guanghzou(55.33±0.67μg m^(-3))and positively correlated with the resident population and leaf N:P.Our findings suggest that C-N-P stoichiometry of C.hystrix was better explained by NO_(2)than by soil C-N-P stoichiometry and that nutrient resorption was better explained by leaf nutrients and DBH than by NO_(2) and soil stoichiometry.Our study supports the hypothesis that rapid urbanization influences NO_(2) concentrations and microclimate,which may jointly change the stoichiometry of plant nutrients in the forest ecosystems. | Feifan Li Bing Sun Zhaowan Shi Nancai Pei | 2021 | Journal of Forestry Research2021，32，6： | 1 |
| 2 | Gibberellin induced shot berry formation in cv.Early Sweet is a direct consequence of high fruit set显示文摘The‘seedless’table grape industry relies mainly on stenospermocarpic cultivars,in which endosperm abortion results in berries with seed rudiments and low levels of bioactive gibberellin(GA).Application of GA to enhance berry sizing in these cultivars is often accompanied by adverse effects,one of which is increased proportions of very small berries(termed shot berries).Manual removal of these berries,which is essential to improve uniformity and market value,increases production cost and exposes the cluster to damage.Unraveling the physiological causes of shot berry formation is thus of both scientific and practical value.This study focuses on understanding the GA-mediated regulation of shot berry formation in Vitis vinifera cv.Early Sweet,known for a high proportion of shot berries,which severely damage cluster appearance.As GA is known to induce the parthenocarpic fruit set,we first tested the assumption that the parthenocarpic nature of a fruitlet is a primary cause for shot berry development.We then examined the consequence of the flower load on the proportion of shot berries in the cluster.Our data suggests that:(1)contrary to prior assumptions,the parthenocarpic nature of a fruitlet is not the primary cause for shot berry development,demonstrated by the fact that parthenocarpic fruitlets develop into a full-size berries;(2)the proportion of shot berries on a cluster is a function of the initial flower load on the inflorescence,with high initial flower load resulting in greater shot berry percentage in the cluster;(3)GA treatment bypasses the natural regulation of flower load,resulting in high fruitlet density and increased competition among fruitlets;(4)variation of flower load within the cluster influences berry size uniformity to a greater extent than does the variation in number of cluster per vine.The identity of the factors that determine the fate of a given flower on a high-load cluster remains an open question. | Etti Or Orly Oren Tamar Halaly-Basha Padmalatha Koilkonda Zhaowan Shi Chuanlin Zheng Atiako Kwame Acheampong | 2020 | Horticulture Research2020，7，1： | 0 |
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