干旱区研究

干旱区研究 ›› 2016, Vol. 33 ›› Issue (5): 966-973.doi: 10.13866/j.azr.2016.05.08

• 生态与环境 • 上一篇    下一篇

模拟氮沉降对天山云杉凋落叶分解及其养分释放的影响

张毓涛1, 李吉玫1,2, 李翔1, 芦建江1, 韩燕梁1, 李建贵3   

  1. 1.新疆林业科学院森林生态研究所,新疆 乌鲁木齐 830063;
    2.新疆林业科学院博士后工作站,新疆 乌鲁木齐 830063;
    3.新疆农业大学,新疆 乌鲁木齐 830000
  • 收稿日期:2014-12-18 修回日期:2015-08-18 出版日期:2016-09-15 发布日期:2016-09-28
  • 作者简介:张毓涛(1967-),男,研究员,主要从事森林生态研究.E-mail:zyt218@163.com
  • 基金资助:
    自治区自然科学基金项目(2016D01A008)资助

Effects of Simulated Nitrogen Deposition on Decomposition and Nutrient Release of Leaf Litter of Picea schrenkiana

ZHANG Yu-tao1, LI Ji-mei1,2, LI Xiang1, LU Jian-jiang1, HAN Yan-liang1, LI Jian-gui3   

  1. 1. Institute of Forest Ecology,Xinjiang Academy of Forestry,Urumqi 830063,Xinjiang,China;
    2. Postdoctoral Workstation,Xinjiang Institute of Forest Ecology,Urumqi 830063,Xinjiang,China;
    3. Xinjiang Agriculture University,Urumqi 830063,Xinjiang,China
  • Received:2014-12-18 Revised:2015-08-18 Published:2016-09-15 Online:2016-09-28

PDF (PC)

950

赞

被引次数

2

摘要： 采用野外模拟试验,通过设计4种氮处理〔CK (对照,不施氮)、LN(低氮,5 kg·hm-2·a-1)、MN(中氮,10 kg·hm-2·a-1)、HN(高氮,15 kg·hm-2·a-1)〕,研究了氮沉降对天山云杉凋落叶分解及养分释放的影响。结果表明:① 分解24个月后CK凋落叶干重残留率分别是LN、MN和HN的1.04倍、1.16倍和1.23倍,且4种处理间差异显著(P<0.05)。CK条件下凋落叶分解50%为4.58 a,分别比LN、MN和HN多0.46 a、0.75 a和1.35 a;相应地分解95%需要的时间分别多2.01 a、3.24 a和5.87 a,说明施氮对天山云杉凋落叶的分解起到了促进作用,且促进作用随着氮沉降量的增加而加大。② 从凋落叶月分解速率看,表现为HN>MN>LN>CK,且随着分解时间的延长,4种处理间的差异逐渐缩小。③ 氮沉降促进了天山云杉凋落叶中木质素和纤维素的分解,同时促进了C元素的释放,增加了N元素的累积,降低了C/N值。

关键词: 氮沉降, 凋落叶, 养分释放, 天山云杉, 山地森林, 干旱区

Abstract: A field simulated experiment was conducted to research the effects of nitrogen deposition on the decomposition and nutrient release of leaf litter of Picea schrenkiana. Four treatments were designed,i.e. the CK (contrast,non-addition nitrogen),LN (low nitrogen,5 kg·hm-2·a-1),MN (mid nitrogen,10 kg·hm-2·a-1) and HN (high nitrogen,15 kg·hm-2·a-1). The results are as follows:① After a 24-month decomposition,the residual rate of leaf litter dry weight of P.schrenkiana in CK was 1.04,1.16 and 1.23 times of that in LN,MN and HN respectively,and the difference among the four treatments was significant (P<0.05). The required time for 50% decomposition of leaf litter in CK was 4.58 a,which was 0.46 a,0.75 a and 1.35 a longer than that in LN,MN and HN,and correspondingly,it was 2.01 a,3.24 a and 5.87 a longer for 95% decomposition,respectively. The results revealed that nitrogen deposition promoted the decomposition of leaf litter of P.schrenkiana,especially at latter stage of decomposition. Moreover,the promotion was more obvious with the increase of nitrogen deposition; ② Monthly decomposition rate was in an order of HN>MN>LN>CK. Moreover,the difference among the four treatments was gradually reduced with the time of decomposition; ③ Nitrogen deposition promoted the release of lignin,cellulose and carbon in leaf litter of P.schrenkiana,and increased the accumulated nitrogen,and decreased the C/N.

Key words: nitrogen decomposition, leaf litter decomposition, nutrient release, Picea schrenkiana, mountain forest, arid area