西南桦和尾巨桉凋落叶分解及其与土壤性质的相关性

[目的]探讨南亚热带西南桦和尾巨桉人工纯林的凋落叶分解动态及其与土壤化学性质之间的相关关系。[方法]采用原位分解袋法研究凋落叶的分解过程。[结果]表明：西南桦、尾巨桉人工林凋落叶分解系数分别为0.96 a^-1和0.88 a^-1。在为期12个月的分解试验中,2种凋落叶有机C含量在整个分解过程中呈逐渐下降趋势;全K含量和C/N比在分解前期迅速下降,之后趋于平缓;全N含量和全P含量在整个分解过程中呈逐渐上升趋势;2种凋落叶N/P比则呈先升高后下降的趋势。无论是分解前期还是分解后期,凋落叶质量损失与N含量均呈显著正相关（前期R=0.877;后期R=0.855）,与C/N均呈显著负相关（前期R=-0...

Full description

Saved in:
Bibliographic Details
Published in林业科学研究 Vol. 29; no. 2; pp. 202 - 208
Main Author 郝建 莫慧华 黄弼昌 周燕萍 蔡道雄
Format Journal Article
LanguageChinese
Published 广西友谊关森林生态系统定位观测研究站，广西 凭祥 532699%天峨县林朵林场,广西 天峨,547300 2016
中国林业科学研究院热带林业实验中心，广西 凭祥 532600
Subjects
养分含量
凋落叶
分解速率
化学性质
南亚热带
尾巨桉
西南桦
西南桦
分解速率
凋落叶
养分含量
leaf litter
chemical properties
Betula alnoides
南亚热带
Eucalyptus urophylla ×E.grandis
subtropical China
nutrient content
decomposition rate
尾巨桉
化学性质
Online AccessGet full text
ISSN1001-1498

Cover

More Information
Summary:[目的]探讨南亚热带西南桦和尾巨桉人工纯林的凋落叶分解动态及其与土壤化学性质之间的相关关系。[方法]采用原位分解袋法研究凋落叶的分解过程。[结果]表明：西南桦、尾巨桉人工林凋落叶分解系数分别为0.96 a^-1和0.88 a^-1。在为期12个月的分解试验中,2种凋落叶有机C含量在整个分解过程中呈逐渐下降趋势;全K含量和C/N比在分解前期迅速下降,之后趋于平缓;全N含量和全P含量在整个分解过程中呈逐渐上升趋势;2种凋落叶N/P比则呈先升高后下降的趋势。无论是分解前期还是分解后期,凋落叶质量损失与N含量均呈显著正相关（前期R=0.877;后期R=0.855）,与C/N均呈显著负相关（前期R=-0.735;后期R=-0.697）。与尾巨桉林地土壤性质相比,西南桦凋落叶分解提高了林地0 10、10 20 cm土壤的有机C、全N、全P、全K、N/P,对2030 cm土壤有机C、全K、p H值、C/N、N/P则未产生显著影响。相关分析表明：凋落叶初始有机C含量与土壤有机C、全N、全P、全K、N/P显著相关;凋落叶初始全N含量与土壤全N、p H值、C/N显著相关。[结论]凋落叶的养分含量与土壤养分的关系紧密;与尾巨桉相比,西南桦凋落叶的养分含量明显较高,分解速率更快,释放到土壤中的养分也更多。
Bibliography:[Objective]To study the decomposition dynamics of leaf litter and its relationship with soil chemical properties in two young plantation stands（ monocultures of Betula alnoides and Eucalyptus urophylla × E. grandis） in subtropical China. [Method]The decomposition processes of leaf litter were measured using mesh nylon bag method. [Result]The decomposition coefficients of leaf litter of B. alnoides and E. urophylla × E. grandis were 0. 96 a~（- 1）and 0. 88 a~（- 1）,respectively. During the 12-month decomposition,the organic carbon contents declined gradually in the two leaf litter. The total K and C / N ratio rapidly decrease at the early stage,and tended towards stability thereafter. The total N and total P in the two leaf litter increased gradually,whereas the N / P ratio increased at first and then decreased throughout the entire decomposition. In both early and late phase of decomposition,the dry mass loss of the leaf litter was correlated positively with the N contents（ R = 0. 877 and 0. 855,respectively）,a
ISSN:1001-1498