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陈望远,熊德成,史顺增,宋涛涛,蔡瑛莹,郭润泉,陈廷廷,郑欣,陈光水.土壤增温对杉木幼苗细根生长量及形态特征的影响.生态学报,2018,(15).http://dx.doi.org/10.5846/stxb201708231521  
土壤增温对杉木幼苗细根生长量及形态特征的影响
Effects of soil warming on fine root growth and morphology of Chinese fir (Cunninghamia lanceolata) seedlings
投稿时间:2017-08-23  修订日期:2018-03-07
DOI: 10.5846/stxb201708231521
关键词土壤增温  细根  内生长环  细根生长量  细根形态
Key Wordssoil warming  fine roots  in-growth donut  fine root growth  fine root morphology
基金项目国家自然科学基金优秀青年基金项目(31422012),福建省杰出青年基金项目滚动资助项目(2014J07005),福建师范大学“大学生创新创业训练计划”(创新训练类)项目(201610394066)
作者单位E-mail
陈望远 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 18860175822@163.com 
熊德成 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 779319315@qq.com 
史顺增 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 402068802@qq.com 
宋涛涛 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 2462531018@qq.com 
蔡瑛莹 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 1028718375@qq.com 
郭润泉 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 769861817@qq.com 
陈廷廷 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 2285817435@qq.com 
郑欣 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 1198844152@qq.com 
陈光水 福建师范大学湿润亚热带山地生态国家重点实验室培育基地 福建师范大学地理研究所 gshuichen@163.com 
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摘要:
为了揭示杉木人工林对全球变暖的地下响应,在福建省三明市陈大国有林场开展杉木(Cunninghamia lanceolata)幼苗土壤增温试验,采用内生长环法探讨增温实验开始后第2年(2015年1月、7月取样)和第3年(2016年1月、7月取样)杉木幼苗细根生长量和形态特征(比根长,SRL;比表面积,SRA;组织密度,RTD)的变化。结果表明:(1)随着苗木的生长,土壤增温对细根生长量的影响趋势是先抑制,再无显著影响,最后促进。(2)土壤增温对细根形态特征的影响在不同取样时间有差异:土壤增温对7月份(夏季)取样的细根SRL或SRA有显著促进作用,对1月份(冬季)取样的细根SRL、SRA均无显著影响。(3)土壤增温对第二、第三次取样的1—2 mm细根RTD有促进作用。表明土壤增温对杉木幼苗细根生长量的影响与苗木生长阶段有关;同时苗木可通过细根形态的调整(增大SRL和RTD)以适应土壤增温引起的土壤资源变化和环境胁迫,维持自身的生长。
Abstract:
Currently, there is large quantity of research on the responses of fine roots to warming, but there are still some controversies. Fine root growth has a direct effect on fine root biomass, and thus affects the plants’ abilities to acquire soil resources and resist environmental stresses such as drought. Fine root morphology is an important feature of root function, and directly affects the ability of fine roots to absorb and transport water and nutrients, yet how root growth and morphology respond to soil warming is not clearly understood. In the present study, a simulated soil warming experiment was carried out in the Chenda State-owned Forest Farm in Sanming City, Fujian Province, China, to investigate the effect on fine root growth and morphology of Chinese fir (Cunninghamia lanceolata) seedlings. Both the soil warming treatment and the control (non-warming) had five replicated 2 × 2 plots, and four 1-year-old Chinese fir seedlings were planted in each plot before beginning of the experiment. Soil warming was accomplished with buried heating cable technology, and soil temperature was elevated to 5°C above ambient. Other plants that naturally sprouted in the plots were removed at regular intervals. Fine roots were sampled at the second (in January and July 2015) and third (in January and July 2016) years of soil warming using the in-growth donut method. Root samples were scanned with an Epson scanner at 300 dpi, and root morphology, including specific root length (SRL), specific root area (SRA), and root tissue density (RTD), was analyzed with WinRHIZO Pro 2009b software. Fine root growth was measured by the fine root dry mass obtained from the in-growth donut every half-year. The results showed that: (1) with the growth of Chinese fir seedlings, the effect of soil warming on fine root growth was initially inhibited, then no significant effect, and finally promoted. (2) The soil warming effect on root morphological characteristics varied at different sampling times: soil warming significantly increased fine root SRL and SRA in July (summer), but there was no significant effect on either SRL or SRA in January (winter). (3) RTD of 1–2 mm diameter roots was significantly increased by soil warming at the second and third samplings. It is concluded that the effect of soil warming on fine root growth of Chinese fir seedlings was related to the seedling growth stages. At the same time, Chinese fir seedlings can adjust their fine root morphology (by increasing SRL and RTD) to adapt to changes in soil resources and environmental stress caused by soil warming, and thus maintain their growth under global warming.
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