种内竞争和残落物覆盖对杉木和檵木细根形态特征的影响

生态学杂志

种内竞争和残落物覆盖对杉木和檵木细根形态特征的影响

王君龙^1,2,王辉民¹,付晓莉^1**,杨风亭¹,陈伏生³

(¹中国科学院地理科学与资源研究所生态网络观测与模拟重点实验室千烟洲生态试验站，北京 100101； ^2中国科学院大学，北京 100049； ³江西农业大学，南昌 330045)

出版日期:2015-03-10 发布日期:2015-03-10

Effects of intraspecific competition and litter coverage on fine root morphological traits of Cunninghamia lanceolata and Loropetalum chinensis.

WANG Jun-long^1,2, WANG Hui-min¹, FU Xiao-li^1**, YANG Feng-ting¹, CHEN Fu-sheng^3

(¹Qianyanzhou Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; ²University of Chinese Academy of Sciences, Beijing 100049; ^3Jiangxi Agricultural University, Nanchang 330045, China)

Online:2015-03-10 Published:2015-03-10

摘要/Abstract

摘要：

细根对生态系统养分、水分和碳循环至关重要。然而，目前关于森林生态系统细根可塑性的研究多集中于乔木树种，对灌木少有研究。本研究以杉木（乔木）和檵木（灌木）为研究对象，采用根袋法研究种内竞争和残落物覆盖对2物种1级和2级细根形态特征（比根长、直径和分枝比）及养分吸收能力的影响，揭示种内竞争和林下管理措施（残落物覆盖）对2物种细根塑性和养分吸收策略的影响机制。结果表明：残落物覆盖、种内竞争及二者的交互作用对杉木细根形态特征各指标均无显著影响。残落物覆盖显著提高了檵木1、2级根分枝比，残落物覆盖、种内竞争及二者的交互作用均显著降低了檵木1级根的直径。檵木细根属性的这些变化增加了其细根的养分吸收速率。因此，增加杉木林残落物覆盖使林下檵木细根形态特征的变化更利于土壤养分的高效吸收，进而可能会与同土层中塑性差的杉木细根产生养分竞争。

关键词: 静态生命表, 时间序列预测, 优势种群, 存活曲线, 天然次生林, 生存函数

Abstract: Fine roots play a key role in soil nutrient cycling. Most studies of fine root plasticity have focused on tree species in forest ecosystems, however, there is limited understanding of fine root plasticity of understory species. In order to understand the effects of intraspecific competition and forest management measure (litter covering) on fine root morphological traits and nutrient uptake strategy, a rootbag method was employed to investigate the effects of intraspecific competition and litter coverage on fine root morphological traits (specific root length, diameter, and branch ratio) of Cunninghamia lanceolata (tree species) and Loropetalum chinensis (shrub species). We found that litter coverage and competition had no significant influence on fine root morphological traits of C. lanceolata. However, litter coverage significantly improved the first two orders fine root branching ratios of L. chinensis. Litter coverage, intraspecific competition and their interaction effect significantly decreased the diameters of 1 and 2order fine roots of L. chinensis. These changes of L. chinensis fine root traits might increase the fine root nutrient absorption rate. Our results indicated that litter addition to C. lanceolata forest might help to improve the nutrient absorption ability of L. chinensis by influencing its fine root morphological traits and thus would enhance the nutrient competition between the overstory and understory species at the same soil depth.

Key words: survival function, static life table, survival curve, time series prediction, natural secondary forest, dominant population

王君龙1,2,王辉民1,付晓莉1**,杨风亭1,陈伏生3. 种内竞争和残落物覆盖对杉木和檵木细根形态特征的影响[J]. 生态学杂志.

WANG Jun-long1,2, WANG Hui-min1, FU Xiao-li1**, YANG Feng-ting1, CHEN Fu-sheng3. Effects of intraspecific competition and litter coverage on fine root morphological traits of Cunninghamia lanceolata and Loropetalum chinensis.[J]. cje.

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