模拟氮沉降对华西雨屏区天然常绿阔叶林凋落叶分解过程中K、Ca、Mg元素释放的影响
Effects of simulated nitrogen deposition on the releases of potassium, calcium, and magnesium during litter decomposition in a natural evergreen broad-leaved forest in the Rainy Area of Western China
投稿时间:2019-09-10  修订日期:2019-12-31
DOI:
中文关键词:  凋落叶分解  K、Ca、Mg元素  养分释放  氮沉降  天然常绿阔叶林  华西雨屏区
英文关键词:litter decomposition  potassium, calcium, magnesium element  nutrient release  nitrogen deposition  natural evergreen broad-leaved forest  the Rainy Area of West China
基金项目:
作者单位E-mail
胡峻嶍 四川农业大学林学院 597405429@qq.com 
周世兴 四川农业大学林学院  
黄从德 四川农业大学林学院 lyyxq100@aliyun.com 
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中文摘要:
      [目的]研究氮沉降背景下凋落叶分解过程中钾(K)、钙(Ca)、镁(Mg)元素的释放动态,为揭示森林生态系统在氮沉降持续增加背景下养分元素的循环过程提供参考。[方法]在华西雨屏区天然常绿阔叶林中设置对照(CK)、低氮(L)、中氮(M)和高氮沉降(H)4个处理,以NH4NO3为氮源,采用尼龙网袋法对凋落叶进行模拟氮沉降分解试验,研究了凋落叶分解过程中K、Ca、Mg元素浓度及残留率,探讨氮沉降对凋落叶分解过程中养分释放的影响。[结果]经过1 a的分解,模拟氮沉降显著抑制了凋落叶分解过程中K元素浓度的下降,显著促进了Ca元素浓度的下降,对Mg元素浓度无显著影响。在各处理中,K元素呈净释放模式,Ca元素表现为释放-富集的交替模式,Mg元素呈富集-释放模式,模拟氮沉降未改变凋落叶分解中K、Ca、Mg元素的释放模式。分解1 a后,L、M和H处理的K元素残留率分别比CK高3.91%、10.27%和13.91%,模拟氮沉降显著抑制了凋落叶分解过程中K元素的释放;L、M和H处理的Ca元素残留率分别比CK低6.39%、6.51%和15.93%,模拟氮沉降显著促进了凋落叶分解过程中Ca元素的释放;L、M和H处理的Mg元素残留率与CK差异不显著,模拟氮沉降对凋落叶分解过程中Mg元素的释放无显著影响。[结论]模拟氮沉降未改变凋落叶分解过程中K、Ca、Mg元素的释放模式,但对凋落叶分解过程中K、Ca、Mg元素的释放速率产生了不同的影响。
英文摘要:
      [Objection] This paper studied the release dynamics of potassium, calcium, and magnesium during litter decomposition under simulated nitrogen deposition, to provide a scientific basis for the nutrient cycling process of forest ecosystem under continuously increasing nitrogen depositions. [Method] NH4NO3 was used to establish control(CK), low(L), medium(M) and high (H) levels of nitrogen deposition in a natural evergreen broad-leaved forest in the Rainy Area of Western China. Nylon mesh bag method was employed to simulate litter decomposition under nitrogen deposition. Experiment was continued for one year and the concentration, remaining percentages and release patterns of potassium, calcium, and magnesium during litter decomposition were studied. [Result] After one year of decomposition, simulated nitrogen deposition significantly inhibited the decrease of potassium in the process of litter decomposition, which significantly promoted the decrease of calcium concentration and had no significant effects on magnesium concentration. However simulated nitrogen deposition did not change the release pattern of potassium, calcium, and magnesium during litter decomposition. Potassium exhibited a net release pattern in all treatments, calcium exhibited release-enrichment alternate pattern and magnesium exhibited an enrichment-release pattern. The remaining percentages of potassium in L, M and H nitrogen treatments increased by 3.91%, 10.27% and 13.91% respectively compared with CK that shows nitrogen deposition significantly inhibited the release of potassium. The remaining percentage of calcium in L, M and H treatments decreased by 6.39%, 6.51% and 15.93% respectively compared with CK, i.e. nitrogen deposition significantly promoted the release of calcium. There was no significant difference in the remaining percentages of magnesium between the control and the nitrogen treatments i.e. simulated nitrogen deposition had no significant effect on the dynamics of magnesium during litter decomposition. [Conclusion] Simulated nitrogen deposition did not change the release pattern of potassium, calcium, and magnesium, while had different effects on the release rate of potassium, calcium, and magnesium during litter decomposition.
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