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| 1 | Effects of Nano-carbon Humic Acid Water-retaining Fertilizer on Citrus Growth and the Soil Bacterial Community in Citrus Field显示文摘[Objective] In order to reveal the effects of reducing the amount of novel nano-carbon humic acid water-retaining fertilizer(CSF) on soil microbial community structure and citrus growth. [Method]In this study,conventional fertilization was as the control(KC1) in Wanzhou citrus orchard of Three Gorges Reservoir area. CSF reductions by 0%(KC2),10%(KC3),20%(KC4),30%(KC5) and 40%(KC6) were used to analyze the changes of soil bacterial community structure,citrus yield and quality. [Result]The results showed that the observed species,Shannon index,Chao1 index and PD_whole_tree of KC6 were higher than those of KC1,and were the same as KC2. The abundance of Xanthomonadaceae was the highest in KC5. Compared with KC1,the Xanthomonadaceae in KC3,KC4 and KC6 was significantly decreased,and the levels of Nitrosomonadaceae and Pseudomonasaceae were higher than that of KC1 after the treatment of KC6. Sphingomonas in different reduction treatments was lower than that of KC1,but Burkholderia and Pseudomonas were significantly higher than those of KC1. It was found that the similarity among treatments was small after bacterial community similarity clustering analysis,and citrus yield increased somewhat after CSF fertilization reduction.When CSF fertilization reduced by 30%,citrus yield increased by 4. 50%. When CSF fertilization reduced by 40%,citrus yield decreased by4. 14%. After CSF fertilization,citrus quality did not change significantly in CSF conventional fertilization and reduction of 10% and 40%,while significantly decreased in 20% and 30% of fertilization reduction. [Conclusion] CSF fertilization reduction changed the diversity of soil bacterial community structure and the yield and quality of citrus. | Men Shuhui Ding Fangjun Zhang Hong Ke Chao Zhang Shiwei Huang Zhanbin | 2018 | Meteorological and Environmental Research2018，9，6： | 1 |
| 2 | Dominance-caused differences in transpiration of trees in a Karst broadleaved mixed forest显示文摘Estimating stand transpiration of natural forests using traditional methods through up-scaling of sap fl ux density from sample trees based on stand sapwood area only is diffi cult because of the complexity of species,ages,and hierarchical structure of natural forests.To improve stand transpiration estimation,we developed an up-scaling method by considering the tree dominance eff ect based on the assumption that individual tree transpiration is aff ected by crown dominance and species,in addition to factors previously considered such as meteorological conditions,sapwood area,and soil moisture.In this study,the meteorological factors,soil moisture,and sap fl ux density of 15 sample trees of diff erent species and dominance in a natural evergreen and deciduous broadleaved mixed forest were simultaneously monitored from March 2012 to February 2014 in the Karst mountain region in southwestern China.After establishing a single tree transpiration model which considers the eff ects of dominance and species,an up-scaling method was explored to estimate stand transpiration.The results show that the transpiration intensity increased exponentially with increasing tree dominance.The contribution to annual stand transpiration from a few dominant trees(5.4%of trees, 28.2% of basal area) was up to 65.0%. The correspondingcontribution was 16.2% from sub-dominant trees(7.6% of trees, 16.2% of basal area) and 22.8% from middleandlower-layer trees (87.0% of trees, 55.6% of basal area).The variation of individual tree transpiration was mainly(97.9%) explained by tree dominance, but very weakly bytree species. The estimated annual stand transpiration was300.2 mm when using the newly developed method whichconsiders tree dominance, 52.5 mm (14.9%) lower than theestimation (352.7 mm) of traditional method which considersonly the sapwood area eff ect, and 8.5 mm (2.7%) lowerthan the estimation (308.6 mm) which considers the eff ectsof both species composition and sapwood area. The maintree characteristics aff ecting stand transpiration are tree size(sapwood area) and dominance. Consideration of tree dominancewill signifi cantly improve stand transpiration estimationand provide a more solid basis for guiding integratedforest-water management at stand scale. | Yanhui Liu Fangjun Ding Deyuan Shu Wenjun Zhao Yingchun Chui Yiju Hou Peng Wu | 2020 | Journal of Forestry Research2020，31，6： | 0 |
| 3 | 改性煤基腐黑物对Cd(Ⅱ)的吸附效果及其机理研究显示文摘针对山西煤基腐黑物(SCH)碱性高和对重金属吸附率低的问题,以山西省灵石县风化煤为原料,提取SCH,采用Ca(OH)2对SCH进行改性制备改性山西煤基腐黑物(Ca-SCH),并通过表征分析和静态吸附实验,探究SCH和Ca-SCH对Cd(Ⅱ)的吸附动力学和热力学特性。研究结果表明,通过扫描电子显微镜(SEM)、比表面积(BET)法和X射线光电子能谱(XPS)证实Ca(Ⅱ)可以成功负载到SCH表面,且改性后Ca-SCH表面粗糙,孔径增大,含氧官能团含量增加,利于对Cd(Ⅱ)的吸附。SCH和Ca-SCH在120 min内达到吸附平衡,符合准二级动力学、Langmuir和Freundlich模型。Ca-SCH对Cd(Ⅱ)的最大吸附量(Qm)为89.29 mg/g,较SCH增加了23.23%。化学改性后,Ca(Ⅱ)负载到SCH表面,通过Ca(Ⅱ)和Cd(Ⅱ)的离子交换可提高SCH的吸附性能,对土壤中Cd(Ⅱ)的钝化具有重要意义。 | Ping Wang Fangjun Ding Zhanbin Huang Zhanyong Fu Peng Zhao Shuhui Men 王平(译) 付战勇(译) 黄占斌(译) 董政(译) | 2023 | 腐植酸2023，，3： | 0 |
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