小兴安岭原始红松混交林林隙土壤不同形态氮含量

生态学杂志

小兴安岭原始红松混交林林隙土壤不同形态氮含量

姜一^1,2,陈立新^1**,段文标¹,步凡¹,孙双红¹,李帆帆¹,徐一凡³

（¹东北林业大学林学院，哈尔滨 150040; ^2黑龙江省鑫农农业发展有限公司，黑龙江齐齐哈尔 164800; ³桂林理工大学，广西桂林 541004）

出版日期:2014-12-10 发布日期:2014-12-10

Concentrations of different nitrogen forms in gaps of natural Pinus koraiensis mixed forest in Xiao Xing’anling Mountains.

JIANG Yi¹, CHEN Li-xin^1**, DUAN Wen-biao¹, BU Fan¹, SUN Shuang-hong¹, LI Fan-fan¹, XU Yi-fan²

(¹College of Forestry, Northeast Forestry University, Harbin 150040, China; ^2Heilongjiang Xinnong Agricultural Development Limited Company, Qiqihar 164800, Heilongjiang, China; ³Guilin University of Technology, Guilin 541004, Guangxi, China)

Online:2014-12-10 Published:2014-12-10

摘要/Abstract

摘要：

以小兴安岭地区红松混交林（椴树红松混交林、云冷杉红松混交林和枫桦红松混交林）大、中、小3个林隙为研究对象，对林隙和郁闭林分土壤铵态氮（NH₄⁺-N）、硝态氮（NO₃^--N）、可溶性全氮（TSN）、可溶性有机氮（SON）、微生物氮（MBN）和全氮（TN）含量进行分析，探讨不同混交林林隙中土壤氮形态特征。结果表明：林隙和郁闭林分土壤以有机氮为主，占TN 98%以上。林隙中土壤NO₃^--N含量高于NH₄⁺-N含量；SON含量高于NH₄⁺-N和NO₃^--N含量。红松混交林中土壤NH₄⁺-N、NO₃^--N、SON和MBN含量在大、小林隙之间以及林隙与郁闭林分之间差异显著，尤其是MBN含量表现为郁闭林分>小林隙>中林隙>大林隙，与林隙面积呈极显著负相关；3个林型中NO₃^--N/TN和MBN/TN随着林隙面积增大而减小；椴树红松混交林和云冷杉红松混交林林隙中NH₄⁺-N/TN、TSN/TN和SON/TN随林隙面积增大而减小，枫桦红松混交林林隙中随林隙面积增大而增大。林隙和郁闭林分中土壤TSN与SON均呈现极显著正相关；林隙土壤NH₄^+_-N与NO₃^--N和MBN呈显著相关，但在郁闭林中未表现出此关系。

关键词: 坡向, 空间关联, 金露梅, 亚高寒草甸, 空间格局

Abstract: The concentrations of different nitrogen (N) forms in soil (ammonium N (NH₄⁺-N), nitrate N (NO₃^--N), total soluble N (TSN), soluble organic nitrogen N (SON), microbial biomass N (MBN) and total N (TN)) were investigated under gaps with different sizes in three Korean pine (Pinus koraiensis) mixed forests (i.e., TiliaKorean pine mixed forest, sprucefirKorean pine mixed forest, and birchKorean pine mixed forest) in Xiao Xing’anling Mountains. The results showed that organic N was the dominant form of TN, accounting for more than 98% of TN. Concentration of NO₃^--N was higher than that of NH₄⁺-N, and SON concentration were higher than NH₄^+_-N and NO₃^--N. Concentrations of NH₄⁺-N, NO₃^--N, SON and MBN showed significant differences between large and small forest gaps and between forest gaps and closed forests. Especially, MBN was in the order of closed forests > small gap > medium gap > large gap, showing a significant negative correlation with gap size. NO₃^--N/TN and MBN/TN decreased with the increase of gap size in the three forests. NH₄⁺-N/TN, TSN/TN and SON/TN decreased with the increase of gap size in the TiliaKorean pine mixed forest gaps and sprucefirKorean pine mixed forest gaps, but increased with the increase of gap size in the birchKorean pine mixed forest gaps. Significant correlations were observed between TSN and SON in forest gaps and closed forests. NH₄⁺-N was significantly correlated with NO₃^--N and MBN in forest gaps, but such relationships were not found in the closed forests.

Key words: Potentilla fruticosa, subalpine meadow, spatial pattern, slope aspect, spatial correlation

姜一1,2,陈立新1**,段文标1,步凡1,孙双红1,李帆帆1,徐一凡3. 小兴安岭原始红松混交林林隙土壤不同形态氮含量[J]. 生态学杂志.

JIANG Yi1, CHEN Li-xin1**, DUAN Wen-biao1, BU Fan1, SUN Shuang-hong1, LI Fan-fan1, XU Yi-fan2. Concentrations of different nitrogen forms in gaps of natural Pinus koraiensis mixed forest in Xiao Xing’anling Mountains.[J]. cje.

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