植物生态学报 ›› 2015, Vol. 39 ›› Issue (10): 1012-1020.DOI: 10.17521/cjpe.2015.0098
所属专题: 生态化学计量
出版日期:
2015-10-01
发布日期:
2015-10-24
通讯作者:
常瑞英
作者简介:
# 共同第一作者
基金资助:
LI Rong1,2, CHANG Rui-Ying1,*()
Online:
2015-10-01
Published:
2015-10-24
Contact:
Rui-Ying CHANG
About author:
# Co-first authors
摘要:
土壤有机碳库是陆地生态系统碳库的重要组成, 在全球碳循环中发挥着重要的作用。受元素化学计量平衡调控作用, 氮输入的增加将会对土壤有机碳库产生重要影响。然而, 目前关于陆地生态系统碳库对氮添加的响应主要集中在植被碳库, 对土壤碳库研究较少, 且研究结论争议较大, 尤其对其响应机制缺少系统梳理。该文作者通过对已有文献进行梳理, 认为生态系统类型、土壤碳变化的检测方法、土壤深度, 以及土壤稳定性碳和易变碳含量的差异可能是造成当前研究土壤碳汇增量(每克氮输入所增加的碳)差异的重要原因。氮添加条件下土壤有机碳的积累机制可能包括3个方面: 1)氮添加增加了凋落物输入, 促进了碳积累; 2)氮添加减少土壤碳输出, 尤其是抑制了稳定性碳的分解; 3)促进土壤腐殖质及稳定性碳的形成。此外, 该文结合当前研究中存在的不足, 提出今后需加强对深层土壤碳、土壤可溶性有机碳的淋溶及吸附, 以及不同土壤碳组分对氮添加的响应研究, 并通过改进检测方法减少氮添加条件下碳储量的测量误差。
李嵘, 常瑞英. 土壤有机碳对外源氮添加的响应及其机制. 植物生态学报, 2015, 39(10): 1012-1020. DOI: 10.17521/cjpe.2015.0098
LI Rong,CHANG Rui-Ying. Effects of external nitrogen additions on soil organic carbon dynamics and the mechanism. Chinese Journal of Plant Ecology, 2015, 39(10): 1012-1020. DOI: 10.17521/cjpe.2015.0098
图1 氮添加对土壤有机碳库及碳循环过程的影响。实心箭头表示土壤碳输入、输出与土壤碳库之间的相互作用。空心箭头表示氮添加作用。向上、向下和平行箭头表示正作用、负作用和作用不显著。 “?”表示相关研究很少, 需要进一步深入。
Fig. 1 Effects of soil nitrogen additions on soil organic carbon storage and cycle. Solid arrows indicate interaction of the input and output of soil organic carbon, and the soil organic carbon storage. Hollow arrows indicate the effect of nitrogen additions. Upward, downward, and parallel arrows show positive, negative, and insignificant effects. The question mark indicates little research was done, or an unanswered question.
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[1] | 陈世苹, 白永飞, 韩兴国. 稳定性碳同位素技术在生态学研究中的应用[J]. 植物生态学报, 2002, 26(5): 549-560. |
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