| 模拟湿地水分变化对小叶章枯落物分解及氮动态的影响 |
| 孙志高
; 刘景双
; 于君宝
; 秦胜金
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| 发表期刊 | 环境科学
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| ISSN | 0250-3301
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| 2008
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| 卷号 | 29期号:08 页码:2081-2093 |
| 关键词 | 枯落物分解
水分梯度
小叶章
氮
三江平原
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| 产权排序 | 中国科学院烟台海岸带可持续发展研究所;中国科学院东北地理与农业生态研究所 |
| 通讯作者 | 孙志高 Sun, Z.-G. ([email protected])
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| 作者部门 | 滨海湿地实验室
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| 英文摘要 | 2005年5月-2006年9月,利用三江平原典型碟形洼地的自然水分梯度作为水分变化研究的替代系统,结合分解袋法,模拟研究了湿地水分变化对典型草甸小叶章（TMC）和沼泽化草甸小叶章（MMC）枯落物分解及氮动态的可能影响.试验沿水分梯度设漂筏苔草群落（PF）、毛果苔草群落（MG）、乌拉苔草群落（WL）、沼泽化草甸小叶章群落（XII）、典型草甸小叶章群落（XI）和岛状林群落（DZL）6个分解小区.研究表明,水分条件对枯落物分解有重要影响,当未来降水格局变化导致小叶章湿地形成积水环境后,TMC和MMC枯落物的失重率分别将增加4.33%-16.76%和24.84%-53.97%,分解速率将增加10.51%-32.73%和77.85%-93.92%,95%分解时间将减少0.72-1.85 a和3.67-4.05 a;TMC和MMC枯落物的氮含量及氮积累指数的变化较为一致,但不同小区间的变化模式差异较大.二者枯落物的氮在DZL、XI、WL、MG和PF小区整体上均表现处出释放-累积的交替变化特征,但仍以释放过程为主.在XII小区,氮在整个时期一直表现为释放.C/N对分解过程中氮养分的调控作用更为重要;TMC和MMC枯落物的氮现存量分别为12.75 g·m~(-2)和8.29 g·m~(-2),氮年归还量分别大于1.95 g·（m~2·a）~(-1)和2.25g·（m~2·a）~(-1);温度对枯落物相对分解速率具有促进作用,水分条件对其具有抑制作用.当分解环境的养分状况不发生较大变化时,相对分解速率取决于枯落物基质质量,当养分状况发生较大改变时,相对分解速率取决于环境养分供给状况. |
| 中文摘要 | From May 2005 to September 2006, the potential effects of wetland water change on the decomposition and nitrogen (N) dynamics of the typical meadow Calamagrostis angustifolia (TMC) and marsh meadow C. angustifolia (MMC) litters were studied by litterbag technique in the typical depressional wetland in the Sanjiang Plain. In this study, the natural water gradient in the depressional wetland was applied to simulate the changes of wetland water conditions, and six decomposition sub-zones were laid in turn in the six communities, Carex pseudocuraica (PF), Carex lasiocarpa (MG), Carex meyeriana (WL), Marsh meadow C. angustifolia (XII), Typical meadow C. angustifolia (XI), and Island forest (DZL), along the water gradient. The results show that water condition has significant effects on the decomposition of litters. If the hydrous environment is formed in C. angustifolia. wetland due to the change of precipitation pattern in the future, the litter weightless rates of TMC and MMC will increase 4.33%-16.76% and 24.84%-53.97%, the decomposition rates will increase 10.51%-32.73% and 77.85%-93.92%, and the 95% decomposition time will decrease 0.72-1.85 a and 3.67-4.05 a, respectively. The changes of N contents and N accumulation indices of TMC and MMC litters are relatively consistent, but the change patterns in different sub-zones are different. In general, the N in litters in DZL, XI, WL, MG and PF sub-zones show the alternant change characteristics of release and accumulation, but the release process is predominated. In contrast with that, the N in litters in XII sub-zone show release at all times. The C/N ratios have important regulation functions to the changes of N in litters in decomposition process. The estimation results show that the N standing crops of TMC and MMC litters are 12.75 g·m-2 and 8.29 g·m-2, and the N annual returning amounts are larger than 1.95 g·(m2·a)-1 and 2.25 g·(m2·a)-1, respectively. The studies of affecting factors indicate that temperature has promotion effects on the relative decomposition rates of litters, while water condition has restraint effects on them. Further analysis shows that the relative decomposition rates, to some extent, depend on the substrate quality of litters if the nutrient status of decomposition environment does not change greatly. In reverse, if the nutrient status of decomposition environment changes greatly, the relative decomposition rates, to some extent, depend on the supply status of nutrient in decomposition environment. |
| 资助机构 | 中国科学院知识创新工程重要方向项目(KZCX2-YW-309);; 山东省黄河三角洲生态环境重点实验室开放基金项目(2007KFJJ01);; 中国科学院“优秀博士学位论文、院长奖获得者”科研启动专项(AJ0809BX-036)
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| 收录类别 | EI
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| 语种 | 中文
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.yic.ac.cn/handle/133337/3845
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| 专题 | 中国科学院海岸带环境过程与生态修复重点实验室_滨海湿地实验室
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推荐引用方式
GB/T 7714 |
孙志高,刘景双,于君宝,等. 模拟湿地水分变化对小叶章枯落物分解及氮动态的影响[J]. 环境科学 ,2008,29(08 ):2081-2093.
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| APA |
孙志高,刘景双,于君宝,&秦胜金.(2008).模拟湿地水分变化对小叶章枯落物分解及氮动态的影响.环境科学 ,29(08 ),2081-2093.
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| MLA |
孙志高,et al."模拟湿地水分变化对小叶章枯落物分解及氮动态的影响".环境科学 29.08 (2008):2081-2093.
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