欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

模拟氮沉降和磷添加对杉木生态化学计量学特征的影响

王巧,张君波,雷赵枫,刘宁,李全,黄华宏,宋新章*   

  1. (浙江农林大学亚热带森林培育国家重点实验室, 杭州 311300)
  • 出版日期:2019-02-10 发布日期:2019-02-10

Effects of simulated nitrogen deposition and phosphorus addition on foliar ecological stoichiometry of Chinese fir.

WANG Qiao, ZHANG Jun-bo, LEI Zhao-feng, LIU Ning, LI Quan, HUANG Hua-hong, SONG Xin-zhang*   

  1. (State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China).
  • Online:2019-02-10 Published:2019-02-10

摘要: 为探讨氮沉降日益增强背景下磷添加对杉木(Cunninghamia lanceolata)人工林叶片生态化学计量特征的影响,为合理施肥提高杉木人工林生产力提供科学依据,本研究以10龄杉木为对象,设置10种处理:低氮(N30:30 kg·hm-2·a-1)、高氮(N60:60 kg·hm-2·a-1)、低磷(P20:20 mg·kg-1)、高磷(P40:40 mg·kg-1)、N30+P20、N30+P40、N60+P20、N60+P40和对照处理(CK)。结果表明:夏季,杉木在3种磷水平下,叶片C、N、P含量及C∶N、N∶P、C∶P均无显著变化(P>0.05),氮沉降显著增加了无磷添加处理下叶片N含量和N∶P(P<0.05),但对杉木叶片C、P含量无影响(P>0.05);秋季,叶片N、P含量和N∶P在低磷添加处理下显著增加但在高磷添加处理下有所降低(P<0.05),叶片C含量和C∶N、C∶P则与之相反(P<0.05),氮沉降虽显著增加了无磷添加处理下叶片的N、P含量(P<0.05),却降低了叶片C含量及C∶N、C∶P (P<0.05),表明氮沉降降低了杉木养分利用效率。模拟氮沉降和磷添加的交互作用对杉木叶片中的C、N、P含量以及C∶P、C∶N、N∶P的影响随处理时间增加而逐渐显著。

关键词: 太湖地区, 稻季, 养分淋洗

Abstract: To examine the effects of phosphorus (P) addition on ecological stoichiometry of Chinese fir (Cunninghamia lanceolata) plantation under the context of increasing atmospheric nitrogen (N) deposition and thus to provide preference for improving productivity through reasonable fertilization, we carried out a field experiment with nine fertilization treatments in a 10-year-old Chinese fir plantation, including low N level (30 kg·hm-2·a-1, N30), high N level (60 kg·hm-2·a-1, N60), low P level (20 mg·kg-1, P20), high P level (40 mg·kg-1, P40), four combinations (N30+P20, N30+P40, N60+P20, and N60+P40) and a control (CK). Ourresults showed that P addition alone had no effect on leaf carbon (C), N, P concentrations and the ratios of C∶N, C∶P, and N∶P in summer. Leaf N concentration and N∶P significantly increased after N addition (P<0.05), but leaf C and P concentrations had no significant change (P>0.05). In autumn, leaf N and P concentrations and N∶P ratio increased first and then decreased with the increases of P addition alone (P<0.05), while leaf C concentration and the ratios of C∶N and C∶P exhibited an opposite trend (P<0.05). Nitrogen addition significantly increased leaf N and P concentrations but decreased leaf C concentration and the ratios of N∶P and C∶P (P<0.05), indicating that N deposition would decrease nutrient use efficiency of Chinese fir under P stress. The interactive effects of N deposition and P addition foliar nutrient concentration and stoichiometric ratios in Chinese fir changed with the duration of the experiment. According to our results, nutrient limitation of young Chinese fir trees varies with season, which provides a scientific basis for the precision fertilization of Chinese fir.

Key words: Nutrient leaching, Paddy field, Taihu Lake area