青海高寒区不同林分类型凋落物养分状况及化学计量特征

生态学杂志

青海高寒区不同林分类型凋落物养分状况及化学计量特征

左巍^1,2，贺康宁^1,2*，田赟^1,2，王玮璐^1,2#br#

(¹北京林业大学水土保持学院，北京 100083； ²北京林业大学水土保持与荒漠化防治教育部重点实验室，北京 100083）

出版日期:2016-09-10 发布日期:2016-09-10

Surface litter stoichiometry for five forest types in alpine region, Qinghai, China.

ZUO Wei^1,2, HE Kang-ning^1,2*, TIAN Yun^1,2, WANG Wei-lu^1,2#br#

(¹ School of Water and Soil Conservation, Beijing Forestry University, Beijing 100083, China; ² Key Laboratory of Water and Soil Conservation and Desertification Control of Beijing Forestry University, Beijing 100083, China).

Online:2016-09-10 Published:2016-09-10

摘要/Abstract

摘要： 凋落物是森林生态系统物质循环和能量流动的纽带，在土壤改良、幼苗更新以及水源涵养等方面具有十分重要的作用，凋落物的碳、氮、磷化学计量特征更是其中的关键。本研究比较了青海高寒地区立地条件和林龄基本相同的华北落叶松(Larix principisrupprechtii)、青海云杉(Picea crassifolia)、青海云杉华北落叶松混交林、青海云杉白桦(Betula platyphylla)混交林、白桦林等5种林分凋落物的养分状况及化学计量特征。结果表明：随着凋落物分解层次加深，5种林分中凋落物的有机碳含量、速效磷含量、碳氮比和碳磷比均呈减小趋势。青海云杉纯林凋落物的铵态氮、硝态氮、速效磷3种速效养分含量均高于其他4种林分类型。阔叶林与针阔混交林地表凋落物的氮含量均显著高于针叶林及针叶混交林，阔叶林地表凋落物氮含量是针叶林的1.23倍，而磷含量则相反，针叶林凋落物磷含量是阔叶林的1.26倍。通过青海高寒区5种林分地表凋落物的化学计量特征比较，可以得出，该地区阔叶林与针阔混交林的凋落物在分解过程中主要受磷元素限制，而针叶林与针叶混交林则受氮、磷两种元素共同限制。

关键词: 乔木幼苗, 种间空间关联性, 空间格局

Abstract: Litter is a link of material cycle and energy flow in forest ecosystems. It plays a very important role in soil improvement, seedling generation, and soil and water conservation, and it is also essential for shaping C, N and P cycling in forest ecosystems. In this study, five different types of litter from Larix principisrupprechtii forest, Picea crassifolia forest, L. principisrupprechtii and P. crassifolia mixed forest, P. crassifolia and Betula platyphylla mixed forest, and B. platyphylla forest under same site conditions in Qinghai alpine region were selected to study the nutrient contents and stoichiometry of litter. The results showed that with the deepening of litter decomposition layer, the organic carbon content, available phosphorus content, carbon/nitrogen ratio, and carbon/phosphorus ratio in litter of the five stands showed a decreasing trend. P. crassifolia forest litter had higher contents of ammonium nitrogen, nitrate nitrogen, and available phosphorus than the other four stands. The nitrogen contents of broadleaved forest and coniferousbroad forest floor litter were significantly higher than that of coniferous forest and coniferous mixed forest floor litter, and the nitrogen content of broadleaved forest floor litter was 1.23 times as high as that of coniferous forest floor litter. On the contrary, the phosphorus content of coniferous forest litter was 1.26 times as high as that of broadleaved forest litter. In comparison of the stoichiometry of five kinds of floor litter, it could be drawn that litter decomposition of broadleaved forest and coniferousbroad forest was mainly limited by phosphorus, while litter decomposition of coniferous forest and coniferous mixed forest was co-limited by nitrogen and phosphorus.

Key words: interspecific spatial association., spatial pattern, tree seedling

左巍1,2，贺康宁1,2*，田赟1,2，王玮璐1,2. 青海高寒区不同林分类型凋落物养分状况及化学计量特征[J]. 生态学杂志.

ZUO Wei1,2, HE Kang-ning1,2*, TIAN Yun1,2, WANG Wei-lu1,2. Surface litter stoichiometry for five forest types in alpine region, Qinghai, China.[J]. cje.

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