植物生态学报 ›› 2015, Vol. 39 ›› Issue (11): 1071-1081.DOI: 10.17521/cjpe.2015.0104

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中亚热带不同演替阶段的马尾松和米槠人工林的细根生产量研究

陈云玉, 熊德成, 黄锦学, 王韦韦, 胡双成, 邓飞, 许辰森, 冯建新, 史顺增, 钟波元, 陈光水*()   

  1. 福建师范大学地理科学学院, 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
  • 收稿日期:2015-06-20 接受日期:2015-09-30 出版日期:2015-11-01 发布日期:2015-12-02
  • 通讯作者: 陈光水
  • 作者简介:

    # 共同第一作者

Fine root production of Pinus massoniana plantation and Castanopsis carlesii plantation at different successional stages in subtropical China

CHEN Yun-Yu, XIONG De-Cheng, HUANG Jin-Xue, WANG Wei-Wei, HU Shuang-Cheng, DENG Fei, XU Chen-Sen, FENG Jian-Xin, SHI Shun-Zeng, ZHONG Bo-Yuan, CHEN Guang-Shui*()   

  1. School of Geographical Sciences, Fujian Normal University, Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China
  • Received:2015-06-20 Accepted:2015-09-30 Online:2015-11-01 Published:2015-12-02
  • Contact: Guang-Shui CHEN
  • About author:

    # Co-first authors

摘要:

对不同演替阶段的树种细根生产动态及其对环境因子响应的差异目前仍缺乏了解。为此, 在福建省三明市选择了中亚热带演替前期的马尾松(Pinus massoniana)和演替后期的米槠(Castanopsis carlesii)两种人工林为研究对象, 采用微根管法对两种人工林的细根根长生产量及其动态进行了为期2年的观测, 并分析了细根生产量的径级和土层分布, 及月生产量动态与气温、降水、土壤温度、土壤含水率等环境因子间的关系。结果表明: 1)两种林分的细根生产量有显著差异, 马尾松人工林细根年根长生产量约为米槠人工林细根年根长生产量的4倍; 两种林分的细根生产量呈现显著的月变化, 峰值均出现在夏季, 且2年内总细根生产量以夏季的细根生产量最大。2)两林分均是直径0-0.3 mm的细根所占细根生产量比例最大; 土层分布上, 马尾松人工林0-10 cm土层细根所占生产量的比例最大, 米槠人工林30-40 cm土层细根所占生产量比例最大。3)偏相关分析表明, 两林分细根月生产量均与气温、土壤温度极显著相关或显著正偏相关, 与降水、土壤含水率的偏相关均不显著; 一元线性回归分析表明, 演替早期马尾松人工林细根月生产量与气温、土壤温度的相关性明显高于米槠人工林。该研究表明, 与演替后期的米槠人工林相比, 中亚热带演替早期的马尾松人工林细根生产量大, 且与温度间的相关性更高。

关键词: 亚热带, 马尾松, 米槠, 演替阶段, 细根生产量, 温度, 水分

Abstract:

AimsOur objectives were to determine differences in fine root production, its relationships with environmental factors, and its diameter- and depth-related distribution patterns between plantations of two subtropical tree species differing in successional stages. MethodsPlantation forests of an early-successional species, Pinus massoniana, and a late-successional species, Castanopsis carlesii, in Sanming, Fujian Province, were selected. Fine root production was monitored for two years using minirhizotrons methods. At the same time, environmental factors including monthly air temperature, monthly precipitation, soil temperature, and soil water content were determined.Important findings 1) During the two years, there was significant difference in annual fine root length production between these two forests, with annual production of P. massoniana plantation nearly four times that of C. carlesii plantation. Fine root length production under both forests showed significant monthly dynamics and maximized in summer, a season when most of fine roots were born. 2) Roots of 0-0.3 mm in diameter accounted for the largest proportion of total fine root length production. Fine roots were concentrated mostly at the 0-10 cm soil depth in P. massoniana plantation, but happened mostly at the 30-40 cm soil depth in the C. carlesii plantation. 3) Partial correlation analysis suggested that, monthly fine root production of both forests was significantly correlated with both air temperature and soil temperature, while it had no significant correlation with either rainfall or soil water content. Linear regression analysis illustrated that monthly fine root production was more correlated with air temperature and soil temperature in the P. massoniana plantation than in the C. carlesii plantation. It was concluded that fine root production in the early-successional P. massoniana plantation was not only much higher in amount, but also more sensitive to temperature, than that in the late-successional C. carlesii plantation.

Key words: subtropical, Pinus massoniana, Castanopsis carlesii, successional stages, fine root production, temperature, water