| 天童常绿阔叶林不同退化群落的凋落物特征及与土壤养分动态的关系 |
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| 引用本文： | 阎恩荣,王希华,周武.天童常绿阔叶林不同退化群落的凋落物特征及与土壤养分动态的关系[J].植物生态学报,2008,32(1):1-12. |
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| 作者姓名： | 阎恩荣 王希华 周武 |
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| 作者单位： | (华东师范大学环境科学系, 上海 200062) |
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| 摘 要： | 该研究以浙江天童常绿阔叶林及退化群落的凋落物特征为内容，探讨了养分归还和土壤养分动态之间的联系。结果显示：1)常绿阔叶林退化显
著降低了凋落物的年凋落量，从成熟常绿阔叶林的13.03 Mg·hm－2下降到灌丛的6.38 Mg·hm－2。2)凋落物氮含量在成熟群落至灌丛阶段下降显
著，而磷含量无明显递减规律；氮磷归还量均随常绿阔叶林退化显著下降。 3)凋落物特征（年均值）与土壤养分的相关分析表明，土壤氮磷含
量与凋落物凋落量间呈显著线性正相关；土壤氮含量与凋落物氮含量间无显著线性关系，而与氮归还量呈显著线性正相关(p<0.05)；土壤总磷
含量与凋落物磷含量和磷归还量间均呈显著线性正相关( 磷含量:p<0.01; 磷归还量: p<0.001)；土壤无机氮含量与凋落物各特征间无显著相关
关系；土壤氮素硝化速率与凋落物凋落量和氮归还量间呈显著线性正相关(凋落物凋落量:p<0.01; 氮归还量: p<0.005)，而与凋落物氮含量无
显著线性关系，与之相比，土壤氮素矿化速率与凋落物特征间均不存在显著线性关系。可以认为，在常绿阔叶林退化过程中，由于不同植物在
养分归还特征上的差异，导致了养分归还量的下降，从而使土壤养分库的物质来源减少，但是，群落结构简化而导致的非生物要素的改变，对
控制土壤生物过程发挥着更大的作用。
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| 关 键 词： | 凋落物特征 土壤养分 常绿阔叶林 天童 |
| 收稿时间： | 2006-05-08 |
| 修稿时间： | 2006-10-24 |
CHARACTERISTICS OF LITTERFALL IN RELATION TO SOIL NUTRIENTS IN MATURE AND DEGRADED EVERGREEN BROAD-LEAVED FORESTS OF TIANTONG,EAST CHINA |
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| YAN En-Rong,WANG Xi-Hua,ZHOU Wu.CHARACTERISTICS OF LITTERFALL IN RELATION TO SOIL NUTRIENTS IN MATURE AND DEGRADED EVERGREEN BROAD-LEAVED FORESTS OF TIANTONG,EAST CHINA[J].Acta Phytoecologica Sinica,2008,32(1):1-12. |
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| Authors: | YAN En-Rong WANG Xi-Hua ZHOU Wu |
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| Affiliation: | Department of Environment Science, East China Normal University, Shanghai 200062 , China |
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| Abstract: | Aims Litterfall plays an important role in linking aboveground and belowground processes in forest ecosystems. Nutrients
absorbed by plants can be released to the soil and re-utilized by plants via litter decomposition. Although litterfall
composition and dynamics have been widely studied in the past two decades, the relationship among litterfall, nutrient
cycling and vegetation types is poorly understood. Therefore, we studied litterfall in evergreen broad-leaved forests (EBLF)
to enrich our knowledge of the relationship.Methods The research was conducted in Tiantong National Forest Park (29 °52′N, 121°39′E, 200 m a.s.l),Zhejiang, East
China. We chose secondary and young EBLF (Schima superba community), coniferous and evergreen broad-leaved mixed forest
(Pinus massoniana+Schima superba community), coniferous forest (Pinus massoniana community) and shrubland (Lithocarpus glaber
+ Loropetalum chinense community) to represent forests at different degradation stages and mature EBLF (Castanopsis fargesii
community) to represent reference climax forest. Productivity, composition, nutrient concentration and total nutrient amount
of the litterfall were measured each month from November 2003 to October 2004. Litterfall traits were correlated with soil
total N, total P, total inorganic N, N mineralization and nitrification rates.Important findings Degradation of EBLF significantly reduced litterfall productivity from 13.03 Mg·hm－2 in mature EBLF to
6.38 Mg·hm－2 in shrubland, and significantly reduced N concentration in litterfall. In contrast, P concentration showed no
consistent pattern. Total N and total P amounts returned via litterfall decreased significantly with degradation. Soil total
N was positively correlated with annual litterfall productivity but not litter N concentration. Soil total P was positively
correlated with both annual litterfall productivity and litter P concentration. Soil inorganic N was not correlated with
either productivity or litter nutrient concentration. Soil N nitrification rate was positively correlated with annual
litterfall productivity and total amounts of nutrients returned, but was not correlated with litter N concentration. Soil N
mineralization was not correlated with any litterfall traits. These results suggested that, during degradation of EBLF,
shifting of plant functional types and simplifying of community structure reduced the quality and quantity of litterfall to a
low level and consequently reduced soil nutrient pools. |
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| Keywords: | litterfall soil nutrients evergreen broad-leaved forest Tiantong |
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