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1.

王影雷金睿何荣晓周鹏《热带生物学报》2015,6(1):78-86

采用实地调查与文献研究相结合、定量分析与定性分析相结合的方法,对海口地区3个平原型热带高尔夫园林的空间布局、植物造景方法、景观元素搭配、人工植物群落进行了调查分析。结果表明:3个球场的空间布局和植物造景都略显单调,隔景和列植分别为其最主要的造景方式;景观元素的搭配形式则较丰富,热带植物及色叶植物的运用使其别具风格和魅力;人工植物群落方面则多以常见园林植物和外来入侵物种为主,缺乏乡土植物的运用和搭配,人工痕迹明显。相似文献

2.

Assessing soil extracellular DNA decomposition dynamics through plasmid amendment coupled with real-time PCR

Wang Fang Che Rongxiao Xu Zhihong Wang Yanfen Cui Xiaoyong 《Journal of Soils and Sediments》2019,19(1):91-96

Journal of Soils and Sediments - Determining soil extracellular DNA decomposition dynamics is essential to assessing lateral gene transfer possibility, nutrient-cycling efficiency, and the... 相似文献

3.

Short-term carbon and nitrogen dynamics in soil,litterfall and canopy of a suburban native forest subjected to prescribed burning in subtropical Australia

Tahmasbian Iman Xu Zhihong Nguyen Thi Thu Nhan Che Rongxiao Omidvar Negar Lambert Geoffrey Bai Shahla Hosseini 《Journal of Soils and Sediments》2019,19(12):3969-3981

Purpose

This study aimed to understand the mechanisms of the variations in carbon (C) and nitrogen (N) pools and examine the possibility of differentiating the burning effects from seasonal and pre-existed N limitations in a native suburban forest ecosystem influenced by prescribed burning in subtropical Australia.

Materials and methods

Soil and litterfall samples were collected from two study sites from 1 to 23 months since last burnt. Soil labile C and N pools, soil C and N isotopic compositions (δ¹³C and δ¹⁵N), litterfall mass production (LM), and litterfall total C, total N, δ¹³C and δ¹⁵N were analysed. In-situ gas exchange measurements were also conducted during dry and wet seasons for Eucalyptus baileyana and E. planchoniana.

Results and discussion

The results indicated that labile C and N pools increased within the first few months after burning, with no correlations with climatic factors. Therefore, it was possible that the increase was due to the burning-induced factors such as the incorporation of ashes into the soil. The highest values of soil and litterfall δ¹⁵N, observed when the study was commenced at the experimental sites, and their high correlations with climatic factors were indicative of long-term N and water limitation. The ¹³C signals showed that soil N concentrations and climatic factors were also two of the main factors controlling litterfall and foliage properties mainly through the changes in photosynthetic capacity and stomatal conductance.

Conclusions

Long-term soil N availabilities and climatic factors were the two of the main driving factors of C and N cycling in the studied forest sites. Further studies are needed to compare soil and litterfall properties before and after burning to profoundly understand the effects of prescribed burning on soil labile C and N variations.

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4.

新型食用蔬菜鸟巢蕨嫩叶营养成分检测

徐诗涛陈秋波宋希强于旭东何荣晓胡翔宇《热带作物学报》2012,33(8):1487-1493

采用国家标准方法对鸟巢蕨嫩叶的营养成分进行测定,并与西芹、韭菜、生菜等7种对照栽培蔬菜进行比较分析.结果表明:鸟巢蕨中主要营养成分粗蛋白、粗脂肪、总糖、粗纤维和灰分的含量分别为样品鲜重的2.82％、2.59％、1.56％、1.16％和1.21％.鸟巢蕨含有18种氨基酸,接近FAO/WHO推荐的理想蛋白模式标准;鸟巢蕨的p-胡萝卜素含量为10.4 μg/g;维生素A含量为9.9 μg/g,维生素B含量为0.7μg/g;维生素C含量为791.2 μg/g.鸟巢蕨的矿质元素含量丰富,P和K含量分别为860、4 921μg/g,微量元素Zn含量为5 μg/g,Mn含量为9.9 μg/g,Cu含量为19.1 μg/g.鸟巢蕨的营养价值在多方面均优于7种对照蔬菜.鸟巢蕨是一种符合现代营养学对健康食品要求的药食同源的功能性野生蔬菜.本研究为鸟巢蕨作为野生蔬菜栽培利用和野生资源保护提供了一定的科学依据. 相似文献

5.

高校地域性校园绿地空间与景观格局分析——以海南大学为例

宋建翰雷金睿宋希强何荣晓《热带作物学报》2015,36(4):773-778

运用景观生态学原理和传统造景艺术手法,分析海南大学校园绿地景观格局分布特点和造景特色。结果表明,海南大学校园绿地景观特色突出,景观多样性较高,具有明显的异质性;同时造景形式多样,体现出强烈的热带滨海校园风光和浓郁的地域性特征。但同类型绿地斑块之间应该加强内部联系;在植物造景突出校园热带特色的同时,应把握其自然性与人工性的结合。相似文献

6.

Responses of ammonia‐oxidizing archaea and bacteria to nitrogen and phosphorus amendments in an alpine steppe

Junfu Dong Rongxiao Che Shugang Jia Fang Wang Biao Zhang Xiaoyong Cui Shiping Wang Shuping Wang 《European Journal of Soil Science》2020,71(5):940-954

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7.

师法热带雨林自然群落，构建城市森林景观：以海口城市道路绿地为例 总被引：1，自引：0，他引：1

何荣晓钟云芳宋希强朱国鹏《热带作物学报》2011,32(10):1968-1972

在城市园林景观设计中模拟地带性森林植被,使城市景观生态系统以及群落外貌近自然化,不仅可以提高城市园林的生态效益,降低养护管理费用,还可以打造具有地方特色的园林景观.本文在调查海口市城市道路绿地景观植物群落结构与组成的基础上,以景观生态学为指导原则,对如何营造兼具景观功能与生态效益的热带园林植物群落进行了探讨.认为海口市园林群落配置应以热带雨林自然群落的结构和演替为依据,以乡土树种为主、引种为辅,增加城市景观植物的多样性;力争做到“师法自然、高于自然”,构建我国南方特色的热带滨海城市森林景观. 相似文献

8.

HPLC—MS／MS法测定水产品中硫酸粘菌素、杆菌肽及维吉尼霉素M1的残留量

罗方方钱卓真林荣晓吴成业《南方水产》2013,(4):62-68

建立了水产品中硫酸粘菌素（CS）、杆菌肽（BTC）及维吉尼霉素M1（VBGMM1）3种多肽类抗生素残留量检测的HPLC-MS/MS法.样品经水溶液[V（甲醇）∶V（0.1％甲酸水溶液）=2∶5]提取,4％三氯乙酸乙腈除蛋白,乙腈饱和正己烷除脂,过OASIS HLB（60 mg）小柱净化后,利用HPLC-MS/MS法,以选择反应监测模式检测,外标法进行定量分析.CS和BTC在0.01～10.00 mg·L^-1质量浓度范围内线性良好,VGMM1在0.002～2.000 mg·L^-1质量浓度范围内线性良好,R2均大于0.995;3种多肽类抗生素的检出限分别为CS 10 μg· kg^-1、BTC 10 μg·kg^-1、VGMM1 2μg·kg^-1,定量限分别为20 μg ·kg^-1、20 μg ·kg-和4 μg·kg-;选择3个不同浓度水平做加标回收,平均回收率在72.3％～ 103.9％,相对标准偏差为1.10％～10.92％.该方法具有操作简便、准确性高、灵敏度高和重现性好等优点,可为检测水产品中这3种药物的残留提供相关技术支持. 相似文献

9.

Soluble components of sediments and their relation with dissolved arsenic in aquifers from the Hetao Basin,Inner Mongolia

Rongxiao Yuan Huaming Guo Di Zhang Yuan Li Yilong Zhang Wengeng Cao 《Journal of Soils and Sediments》2017,17(12):2899-2911

Purpose

High groundwater arsenic (As) and salinity have been detected in aquifers of the Hetao Basin in Mongolia which have caused serious public health concerns. The objective of this study was to characterize the distributions of the soluble components in sediment in different lithologies and depths and to assess the relationship between soluble As in sediments and dissolved As in groundwater.

Materials and methods

One hundred and one sediment samples and 13 groundwater samples were collected from four boreholes at varied depths. In addition to total chemicals and mineralogical phases of sediments, the soluble components (including major ions and As, Fe, and Mn) in sediments and dissolved chemicals in groundwater were analyzed.

Results and discussion

Clay or silty clay had relatively higher EC values (189–805 μS cm^?1) than aquifer sands (approximately 92–261 μS cm^?1). The major soluble components were Na⁺, Ca²⁺, HCO₃ ^?, and SO₄ ^2?, which were more variable in clay samples than fine sand samples. Soluble As concentrations ranged between 2 and 950 μS cm^?1, and high contents generally occurred in clay sediments with high contents of soluble Fe and Mn. A comparison of chemicals between soluble components in sediments and dissolved species in groundwaters at matched depths showed that chemicals were preferentially partitioned into sediments at the mountain front and deep aquifers (>60 m), while partitioned into groundwater in the shallow aquifers (<60 m) of the flat plain. Arsenic was preferentially partitioned into groundwater in aquifers with relatively low dissolved SO₄ ^2?.

Conclusions

Groundwater components were mostly sourced from corresponding sediments. In clay sediments, As was desorbed from the surface sites along with other soluble components. Under reducing conditions, reduction of Fe oxides with high surface sites for As adsorption led to a weak association of As with other phases (such as carbonates), and therefore resulted in high dissolved As concentrations and low As partition between sediments and groundwater in deep aquifers.

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10.

Assessing soil microbial respiration capacity using rDNA- or rRNA-based indices: a review

Rongxiao Che Weijin Wang Jing Zhang Thi Thu Nhan Nguyen Juan Tao Fang Wang Yanfen Wang Zhihong Xu Xiaoyong Cui 《Journal of Soils and Sediments》2016,16(12):2698-2708

Purpose

Understanding soil heterotrophic respiration in relation to microbial properties is not only fundamental to soil respiration modelling, prediction, and regulation through management, but also essential to interpreting microbial community dynamics from an ecologically meaningful perspective. This paper reviewed the recent advances in knowledge and proposed future directions for exploring the respiration-microbe relationships by means of rDNA- or rRNA-based indices (i.e. rDNA copies, rRNA copies, and rDNA- or rRNA-based community structures).

Materials and methods

We first elucidated the theoretical basis for using rDNA- or rRNA-based indices to probe into soil microbial respiration. Then, the published studies that simultaneously measured soil microbial respiration and the rDNA- or rRNA-based indices were synthesized, extracted, and analysed to further explore the respiration-microbe relationships. At last, the uncertainties and perspectives for establishing the respiration-microbe links were proposed and discussed.

Results and discussion

The rDNA- or rRNA-based indices are theoretically promising for pinpointing the relationships between soil heterotrophic respiration and microbial properties. Our systematic review suggested that the correlations between bacterial rDNA copies and microbial respiration are inconsistent across studies, while the fungal and archaeal rDNA (or ITS) copies showed moderately positive and negative correlations with soil microbial respiration, respectively. Bacterial 16S rDNA-based community structures were significantly correlated with soil microbial respiration in some studies, but not in some short-term situations. Although rRNA copies are widely used as the proxies of microbial activity, no significant correlations between rRNA copies and soil microbial respiration have been found in previous studies. Bacterial 16S rRNA-based community structures were correlated well with the short-term responses of soil microbial respiration to rewetting or labile carbon amendments and clearly outperformed other rDNA- or rRNA-based indices. As respiration-microbe relationships can be affected by many factors, such as soil physicochemical properties and even the analysis methods of microbial indices, the 69 previous studies included in this review actually provided limited information on them, and the aforementioned results still need to be further confirmed in future studies.

Conclusions and perspectives

Overall, the relationships between soil microbial respiration and rDNA- or rRNA-based indices are still far from being well established. Future research should be directed to systematically understanding the respiration-microbe links, with more attention to the fungus-, archaea- and RNA-related molecular indices. The relationships between microbial specific lineages and total respiration rates should be explored in future studies, and the effects of edaphic properties on the respiration-microbe relationships should also be evaluated.

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