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| 1 | Changes in soil properties under Eucalyptus relative to Pinus massoniana and natural broadleaved forests in South China显示文摘The ecological effects of eucalypt plantations(EPs) have garnered increasing attention.To understand their effect on soil quality at a landscape scale,and to determine whether soil quality parameters differ due to different stand types,we evaluated soil characteristics in twenty-one groups of EPs,Pinus massoniana Lamb.plantations(PMPs) and natural broadleaved forests(NBFs)across Guangdong Province,China.Both the physical characteristics of soil hydrology and the properties of soil nutrients in A and B horizons were determined.Results showed that,compared to NBFs,EPs and PMPs produced a shallower litter layer,reduced canopy density,higher soil bulk density,significantly lower total porosity,non-capillary porosity,total water volume,and hygroscopic water in the A horizon(P<0.05).Moreover,total N,available K,and soil organic carbon(SOC) in EPs and PMPs were significantly lower than in NBFs.EPs and PMPs did not differ significantly in N,P or K content,but PMPs had significantly lower SOC and boron in the A horizon than EPs.Low p H and poor capacity to buffer acidification generally occurred in all cover types.Both EPs and PMPs showed a decline in soil properties relative to NBFs,but EPs and PMPs exhibited no significant difference.These results indicate that actions are needed to ameliorate the potential negative effects on soil quality in forestry plantations. | Shuangshuang Chu Douglass F.Jacobs Joshua L.Sloan Li Xue Daoming Wu Shucai Zeng | 2018 | Journal of Forestry Research2018，29，5： | 1 |
| 2 | Apidaeeins:antibacterial PePtides from honeybees显示文摘 | Casteels P C.AmPe F.Jacobs | | 0，，08： | 1 |
| 3 | Pseudomonas aeruginosa: resistance and therapeutic options at the turn of the new millennium显示文摘 | N.Mesaros P.Nordmann P.Plésiat M.Roussel‐Delvallez J.Van Eldere Y.Glupczynski Y.Van Laethem F.Jacobs P.Lebecque A.Malfroot P. M.Tulkens F.Van Bambeke | 2007 | Clinical Microbiology and Infection2007，，6： | 1 |
| 4 | 大学里的12个高分秘诀显示文摘成绩是衡量学生优秀与否的重要标准。正如上班族的工资、棒球运动员的击球率、商品的价格一样,学生的成绩是衡量在校表现的一个重要客观指标。本期'直面留学',我们为您提供了12个得高分的秘诀,希望每位刚踏入大学的读者门门得A。 | Lynn F.Jacobs Jeremy S.Hyman | 2009 | 海外英语2009，，11： | 0 |
| 5 | 13个讨老师喜欢的方法显示文摘在学校里,那些讨老师喜欢的学生总是能得到更多的帮助,无论是在学习上还是找工作的过程中。老师愿意花时间来培养他们喜爱的学生,也乐意为其写一份好的就业推荐书。那么,怎样才能成为讨老师喜欢的学生呢?请看本期直面留学。 | Lynn F.Jacobs Jeremy S.Hyman | 2009 | 海外英语2009，，12： | 0 |
| 6 | Influence of mulching and tree shelters on 4-year survival and growth of zeen oak (Quercus canariensis) seedlings显示文摘We assessed the effect of mulching and tree shelters on the establishment and early growth of zeen oak(Quercus canariensis Willd.) during the first 4 years after planting in Northwestern Tunisia. Five mulch types(Italian Stone Pine(Pinus pinea L.), Lentisk(Pistacia lentiscus L.),and a combination of Italian Stone Pine and Lentisk(organic mulches), gravel(inorganic mulch) and control), and three tree shelter types(non-vented and vented tree shelters, and control) were tested. An increase in the number of internodes occurred under the gravel mulch, while a reduction in survival was found for the lentisk mulch. Tree shelters had no effect on survival, but increased mean height growth and reduced mean diameter growth during the 4 years(excepting a non-significant effect for vented tree shelter at year four). Comparison of the annual shoots and growth units(GU) between sheltered and unsheltered plants according to year of formation revealed two growth phases. In first phase, shoots were totally or partially inside the shelters; mean length of annual shoots and GU were greater for sheltered plants. The second phase was characterized by shoots emerging from shelters; mean length of annual shoots and GU were similar for all plants, with or without tree shelters. Results suggest that the use of tree shelters, particularly vented shelters, could contribute to the improvement of the artificial regeneration of zeen oak.The use of mulching alone or in combination with tree shelters did not improve zeen oak performance in the field. | Taher Mechergui Marta Pardos Douglass F.Jacobs | 2019 | Journal of Forestry Research2019，30，1： | 0 |
| 7 | 给教授发电邮的“门道”显示文摘教授们在赶办公电子化的潮流,这意味着,除了一对一的单独辅导,教授们越来越喜欢通过电子邮件和学生交流。以下是你在点击“发送”按钮前要注意的一些事情。 | Lynn F.Jacobs Jeremy S.Hyman 阿诺 | 2009 | 新东方英语(中英文版)2009，，6： | 0 |
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