高级检索+

不同林分类型对叶功能性状、林下物种多样性及土壤养分的影响

Effects of Different Stand Types on Leaf Functional Traits, Understory Species Diversity and Soil Nutrients

  • 摘要:
    目的 研究不同林分类型(黑松纯林、黑松-刺槐混交林、黑松-麻栎混交林)的黑松针叶功能性状、林下物种多样性、林下土壤因子的特征,以期为黑松海防林的建设与管理提供依据与参考。
    方法 以烟台牟平海防林内黑松为研究对象,通过采集黑松针叶及林下0~20 cm土壤样品并调查林下物种多样性,测定针叶的相关功能性状及土壤理化性质,对林下物种多样性指标进行计算,对林下土壤因子对针叶功能性状及林下物种多样性的影响进行RDA分析。
    结果 (1)不同林分类型对叶面积(LA)、叶长(LL)、比叶面积(SLA)、比叶质量(SLW)、叶干物质量(LDMC)、叶含水率(LWC)等叶结构性状均有显著影响,叶化学性状中仅对C、N含量有显著影响。(2)不同林分类型对林下植被多样性指标均有显著影响,黑松-麻栎混交林的Simpson指数最高,黑松-刺槐混交林的Shannon-Wiener 指数、Margalef指数、Pielou指数均最高,而黑松纯林各指标均表现为最低,马唐(Digitaria sanguinalis)、狗尾草(Pennisetum alopecuroides)在各群落中优势显著。(3)不同林分类型对土壤EC、有机碳(SOC)、全氮(TN)、硝态氮 (NO3-N)、铵态氮 (NH4 + -N)、速效钾 (AK)均有显著影响。(4)SOC、AK、NH4 + -N对叶功能性状及林下物种多样性均有显著影响,TP、NO3-N分别对功能性状与物种多样性有显著影响。
    结论 本试验条件下,不同林分类型下黑松针叶的功能性状、林下物种多样性对林下土壤因子均有一定响应, 防护林的建设与管理要综合考虑林分类型、林下植被及土壤养分的作用。

     

    Abstract:
    Objective To explore the needle functional traits, understory species diversity and understory soil factors of different forest types (Pinus thunbergia pure forest, Pinus thunbergia -Robinia pseudoacacia mixed forest, Pinus thunbergia -Quercus acutissima mixed forest) for providing basis and reference for the construction and management of Pinus thunbergia in the coastal shelter forest.
    MethodsBased on Pinus thunbergia in the coastal shelter forest of Muping, Yantai, the needles and understory 0~20cm soil samples of Pinus thunbergia were collected, and the understory species diversity was investigated. The related functional traits of needles and soil physical and chemical properties were measured, and the understory species diversity index was calculated. Also the effects of understory soil factors on needle functional traits and understory species diversity were analyzed by RDA.
    Results(1) Different stand types had significant effects on leaf structural traits such as leaf area (LA), leaf length (LL), specific leaf area (SLA), specific leaf weight (SLW), leaf dry matter mass (LDMC) and leaf water content (LWC), while only C and N contents were significantly affected by leaf chemical traits. (2) Different stand types had significant effects on understory vegetation diversity indexes. Simpson index was the highest in the Pinus thunbergia -Quercus acutissima mixed forest, Shannon-Wiener index, Margalef index and Pielou index were the highest in the Pinus thunbergia -Robinia pseudoacacia mixed forest, and all indexes were the lowest in the Pinus thunbergia pure forest. Digitaria sanguinalis and Pennisetum alopecuroides were dominant in each community. (3) Different stand types had significant effects on soil EC, SOC, TN, NO3-N, NH4+-N and AK. (4) SOC, AK and NH4+-N had significant effects on leaf functional traits and understory species diversity, while TP and NO3-N had significant effects on functional traits and species diversity, respectively.
    Conclusion Under the experimental conditions, the functional traits of Pinus thunbergii needles and the diversity of understory species under different stand types have certain responses to the understory soil factors. The construction and management of shelterbelt should comprehensively consider the role of stand type, understory vegetation and soil nutrients.

     

/

返回文章
返回