氮磷添加对水曲柳人工林叶片、细根和土壤生态化学计量特征的影响  

Effects of Nitrogen and Phosphorus Addition on Stoichiometry Characteristics of Leaf, Fine Root and Soil of Fraxinus mandshurica Plantation

作　　者：何相玉 周冠军 张新洁 张庆江 孙海龙[1] HE Xiangyu;ZHOU Guanjun;ZHANG Xinjie;ZHANG Qingjiang;SUN Hailong(School of Forestry,Northeast Forestry University,Harbin 150040,China;Shangzhi State-owned Forestry Center Management Bureau,Xiaojiu Forestry Center,Shangzhi 150600,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]黑龙江省尚志国有林场管理局小九林场,黑龙江尚志150600

出　　处：《森林工程》2023年第1期73-81,共9页Forest Engineering

基　　金：中央高校基本科研业务费(2572020DR05);国家重点研发项目(2017YFD0600605)。

摘　　要：氮、磷元素缺乏是人工林培育的主要限制因素,为探究氮、磷施肥对水曲柳人工林林木和土壤养分特征的影响,以16年生水曲柳人工林为研究对象,分析氮(N0为不施氮,N1施氮量为5 g/m^(2),N2施氮量为20 g/m^(2))、磷(P0为不施磷,P1施磷量为7.5 g/m^(2),P2施磷量为15 g/m^(2))施肥对林木叶片、细根和土壤生态化学计量特征的影响。结果表明,随施氮量的增加,水曲柳人工林叶片和细根C、N含量、土壤N含量均显著增加,而细根P含量显著降低(P<0.05),同时,叶片C/N显著降低,叶片C/P和细根N/P在施磷处理下显著增加。随施磷量的增加,叶片、细根和土壤P含量均逐渐增加,叶片和细根的C/P和N/P在N0处理下均显著降低。相关性分析表明,土壤N含量与叶片和细根N含量呈显著正相关(P<0.05),但与叶片和细根C/N呈显著负相关(P<0.05);叶片N含量与细根N含量、叶片P含量与细根P含量、叶片C/N与细根C/N、叶片N/P与细根N/P均呈显著正相关(P<0.05)。上述结果表明,氮肥和磷肥混施后水曲柳叶片的养分状况优于单施氮肥或磷肥;施肥后水曲柳叶片与细根的化学计量比多数呈显著正相关,表明水曲柳的地上与地下营养器官在养分的分配过程中具有较好的协同作用。The lack of nitrogen and phosphorus elements is the main limiting factor for plantation cultivation, in order to understand the responses of nitrogen and phosphorus fertilization on the tree and soil nutrient characteristics of Fraxinus mandshurica plantation, in this study, the effects of nitrogen(N0 0 g/m^(2), N1 5 g/m^(2), N2 20 g/m^(2)) and phosphorus(P0 0 g/m^(2), P1 7.5 g/m^(2), P2 15 g/m^(2)) fertilization on the ecological stoichiometry of leaf, fine root and soil were analyzed in a 16-year-old Fraxinus mandshurica plantation. The results showed that: with the increase of nitrogen supply, the C and N content of leaf and fine root, and the N content of soil were significantly increased in the Fraxinus mandshurica plantation, while the P content of fine root and C/N ratio of leaf was significantly decreased(P<0.05). Meanwhile, the C/P ratio of leaf and N/P ratio of fine root was significantly increased under P addition. With the increase of P supply, the P content of leaf, fine root and soil increased gradually, and the C/P and N/P of leaf and fine root decreased significantly under N0 treatment. Correlation analysis showed that, soil N content was significantly positively associated with leaf and fine root N content(P<0.05), but significantly negatively correlated with leaf and fine root C/N content(P<0.05). There were significant positive correlations between leaf N content and fine root N content, leaf P content and fine root P content, leaf C/N and fine root C/N, leaf N/P and fine root N/P(P<0.05). The results showed that the nutrient status of Fraxinus mandshurica leaf after mixed application of nitrogen and phosphorus fertilizers was better than that after nitrogen or phosphorus fertilization alone. After fertilization, the stoichiometric ratios of fine root and leaf in the Fraxinus mandshurica plantation were significantly positive, it meant that the nutrient allocation of the leaf and fine root had a good synergistic action in the Fraxinus mandshurica plantation.

关 键 词：水曲柳 氮 磷 生态化学计量比 

分 类 号：S725.5[农业科学—林木遗传育种]