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应用生态学报 ›› 2016, Vol. 27 ›› Issue (4): 1031-1038.doi: 10.13287/j.1001-9332.201604.029

• 中国生态学学会2015 年学术年会会议专栏 • 上一篇    下一篇

亚热带典型林分对表层和深层土壤可溶性有机碳、氮的影响

肖好燕1,2,刘宝3,余再鹏1,2,万晓华1,2,桑昌鹏1,2,周富伟1,2,黄志群1,2*   

  1. 1湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
    2福建师范大学地理科学学院, 福州 350007;
    3福建农林大学林学院, 福州 350002
  • 收稿日期:2015-07-01 修回日期:2016-01-23 出版日期:2016-04-22 发布日期:2016-04-22
  • 通讯作者: zhiqunhuang@hotmail.com
  • 作者简介:肖好燕,女,1991年生,硕士研究生. 主要从事森林土壤碳循环研究. E-mail: 642127962@qq.com
  • 基金资助:
    本文由国家自然科学基金项目(41371269)、国家重点基础研究发展计划项目(2014CB954003)和福建省杰出青年科学基金项目(2060203)

Effects of forest types on soil dissolved organic carbon and nitrogen in surface and deep la-yers in subtropical region, China.

XIAO Hao-yan1,2, LIU Bao3, YU Zai-peng1,2, WAN Xiao-hua1,2, SANG Chang-peng1,2, ZHOU Fu-wei1,2, HUAGN Zhi-qun1,2*   

  1. 1Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
    2College of Geographical Science, Fujian Normal University, Fuzhou 350007, China;
    3College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
  • Received:2015-07-01 Revised:2016-01-23 Online:2016-04-22 Published:2016-04-22
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(41371269), the National Key Basic Research and Development Plan (2014CB954003), and the Science Foundation for Excellent Talents of Fujian Province, China (2060203).

摘要: 林分类型是影响土壤可溶性有机碳、氮库大小的重要因素,但目前对其研究主要集中在表层土壤(0~10 cm).本研究以亚热带地区天然林、毛竹林、格式栲人工林和杉木人工林为对象,用3种不同的浸提方式(冷水、热水和KCl溶液)提取表层(0~10 cm)和深层(40~60 cm)土壤中可溶性有机碳(DOC)和有机氮(DON),研究林分类型对表层和深层土壤可溶性有机碳、氮库的影响.结果表明: 林分类型对表层土壤DOC及其占土壤总有机碳(TOC)的比重有显著影响,深层土壤受林分类型的影响不显著;不同林分土壤DON含量仅在表层土壤存在显著差异,在深层土壤差异不显著.林分间土壤微生物生物量碳的差异仅在表层土壤达到显著水平.DON占土壤总氮(TN)的比重在各林分表层和深层土壤间差异均不显著.3种浸提方法得到的DOC和DON库大小顺序为热水>KCl>冷水,不同浸提方法得到的DOC库及DON库的相关性均达到显著水平,表明冷水、热水和KCl溶液浸提得到的有机碳、氮库含有相似组分.冷水和热水浸提方法得到的表层土壤DOC和DON含量及DOC占TOC比重在天然林和毛竹林均显著大于格式栲和杉木人工林,表明天然林和毛竹林土壤可溶性有机碳、氮含量高于格式栲和杉木人工林,更有利于土壤肥力的恢复.

Abstract: Forest types have significant effects on the availability and dynamics of soil dissolved organic carbon (DOC) and dissolved organic nitrogen (DON). By now the impacts of forest types on soil DOC and DON were mainly focused on surface soil (0-10 cm). Based on the comparisons between natural forest, Phyllostachys pubescens, Castanopsis kawakamii and Cunninghamia lanceolata plantations, we investigated the effects of forest types on soil DOC and DON pools in top (0-10 cm) and deep soils (40-60 cm). Cold water, hot water and KCl solutions were used to extract soil DOC and DON from surface and deep soils. Results showed that the effects of forest types on soil DOC, DOC/TOC, DON and soil microbial biomass carbon were only significant in the surface soil. The concentrations of DOC and DON varied with extract methods and hot water extracted the largest amounts of DOC and DON, and cold water the least. Correlations among hot water, KCl and cold water extracted DOC and DON were significant, suggesting that the organic C and N released by these three solutions might be at least partly from similar pools. The concentrations of DOC and DON and DOC/TOC in surface soil under natural forest and P. pubescens were greater than under C. kawakamii and C. lanceolata. It indicated that the concentrations of DOC and DON were greater under the natural forest and P. pubescens than under the C. kawakamii and C. Lanceolata, and more beneficial to improve soil fertility.