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辽东山区主要树种叶片氮、磷、钾再吸收

闫涛1,2,3,杨凯1,2,朱教君1,2**   

  1. 1中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室, 沈阳 110164; 2中国科学院清原森林生态实验站, 沈阳 110016; 3中国科学院大学, 北京 100049)
  • 出版日期:2014-08-10 发布日期:2014-08-10

Leaf N, P and K resorption of major tree species in a montane region of eastern Liaoning Province, China.

YAN Tao1,2,3, YANG Kai1,2, ZHU Jiao-jun1,2**   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China; 2Qingyuan Experimental Station of Forest Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2014-08-10 Published:2014-08-10

摘要:

养分再吸收作为植物保存养分的重要机制之一,在凋落物分解和养分循环中起着重要作用。为明确辽东山区主要树种养分再吸收状况,选择4种次生林树种:蒙古栎(Quercus mongolica)、色木槭(Acer mono)、胡桃楸(Juglans mandshurica)、花曲柳(Fraxinus rhynchophylla)和人工林落叶松(Larix spp.)为对象,测定了各树种叶片凋落前(成熟叶)后(凋落叶)全氮(N)、全磷(P)、全钾(K)浓度,并分析了养分再吸收特征。结果表明:所测树种凋落叶N、P、K浓度均显著低于成熟叶(落叶松K不显著);胡桃楸N再吸收率与蒙古栎、色木槭、花曲柳差异显著,花曲柳与蒙古栎、色木槭P再吸收率差异显著,色木槭K再吸收率与蒙古栎、胡桃楸、花曲柳差异显著(P<0.05);总体上,落叶松N、P、K再吸收率低于次生林树种,尤其是P再吸收率显著低于花曲柳、K再吸收率显著低于胡桃楸和花曲柳(P<0.05)。上述结果表明,落叶松通过降低养分再吸收率,提高凋落物养分输入量,对土壤养分有效性做出正反馈。
 

关键词: 多重抗性, 靶标酶, 杀虫剂, 生态平衡

Abstract: Nutrient resorption, one of the important mechanisms for nutrient conservation in plant species, plays an important role in litter decomposition and nutrient cycling. To clarify the nutrient resorption between Larix spp. in the plantation forest and four native broadleaved tree species (i.e., Quercus mongolica, Acer mono, Juglans mandshurica and Fraxinus rhynchophulla) in the secondary forests, we measured N, P and K concentrations in mature and senescent leaves of these five tree species in a montane region of eastern Liaoning Province, China. The results showed that the N, P and K concentrations of senescent leaves were significantly lower than those of mature leaves, except for the K concentration of Larix spp. (P<0.05). The N resorption efficiency of J. mandshurica was significantly different from that of the other three broadleaved tree species (P<0.05). The P resorption efficiency of F. rhynchophulla was significantly different from that of Q. mongolica and A. mono (P<0.05). Furthermore, the K resorption efficiency of A. mono was significantly different from that of the other three broadleaved tree species (P<0.05). N, P and K resorption efficiencies of Larix spp. were generally lower than those of the broadleaved tree species, especially its P resorption efficiency was significantly lower than that of F. rhynchophulla (P<0.05) and its K resorption efficiency was significantly lower than that of J. mandshurica and F. rhynchophulla (P<0.05). All of these indicated that the larch made a positive feedback on soil nutrient availability via reducing the nutrient resorption efficiency and improving the litter nutrient input.

Key words: target enzyme, pesticide, multi-pesticide resistance, ecological equilibrium