外源氮输入对长白山红松凋落物早期分解的影响

被引:18
作者
邓小文 [1 ]
张岩 [1 ]
韩士杰 [1 ]
李晓峰 [2 ]
李考学 [3 ]
李雪峰 [1 ]
机构
[1] 中国科学院沈阳应用生态研究所
[2] 中国科学院地理科学与资源研究所
[3] 东北林业大学林学院
关键词
外源氮; 分解; 早期; 红松凋落物;
D O I
10.13332/j.1000-1522.2007.06.009
中图分类号
S718.5 [森林生态学];
学科分类号
摘要
该文研究了外源氮对长白山红松凋落物早期分解的影响,并对不同海拔红松凋落物分解过程对外源氮输入的响应进行了比较.实验共包括3个外源氮梯度(03、0和50 kg/(hm2.a),NH4NO3).13周的培养实验后,研究结果表明,在红松凋落物分解的初期阶段,外源氮输入促进了其分解过程(P<0.05),接受高外源氮输入样品的分解量和呼吸速率显著高于低外源氮和对照样品;内源氮并不是影响不同海拔红松凋落物分解的主要因素,木质素含量才是控制其分解的主要因子;外源氮对凋落物可溶性有机碳(DOC)的淋失都没有显著影响,而对可溶性有机氮(DON)淋失量的影响存在很大的不确定性.研究发现,尽管有部分外源氮淋失,但凋落物仍可以通过固持作用截留40%55%外源氮,随着外源氮输入的增加其截留量也随之增加.
引用
收藏
页码:16 / 22
页数:7
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