Germination of Deyeuxia angustifolia as affected by soil type, burial depth, water depth and oxygen level
Germination of Deyeuxia angustifolia as affected by soil type, burial depth, water depth and oxygen level
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土壤类型、埋深、水深和含氧量对狭叶小叶芽萌发的影响
DOI：
10.1007/s11027-009-9172-y
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发表时间：
2009-03
影响因子：
4
通讯作者：
Li, Youzhi
中科院分区：
文献类型：
--
作者：
Xie, Yonghong;Zhang, Canming;Liu, Fen;Li, Youzhi
沙叶草是中国最大的淡水沼泽湿地三江平原的优势种。然而，由于环境的巨大变化，该物种已经衰落。在海平面上升和温室气体的影响下，洪水的强度、频率和湿地沉积率大幅增加。因此，本文研究了土壤环境（土壤类型、埋藏深度、水深和氧气浓度）对沙枣种子萌发的影响。土壤类型和埋藏深度都会影响幼苗的出苗。幼苗在 1、2、4 毫米的沙子以及 1 和 2 毫米的泥中长出。无论土壤如何，随着埋深的增加，出苗时间增加，出苗率下降。例如，幼苗第4天开始出苗，覆盖1毫米泥时，最终出苗率为30%；而第6天开始出苗，覆盖2毫米泥时，最终出苗率仅为8%。相同埋深下，砂土中的出苗率高于泥中。水深的增加抑制了种子的发芽。 2厘米水位的发芽率（20%）比12厘米水位的发芽率（9%）高1.2倍。氧气浓度也影响发芽。在21%氧气浓度下，种子第2天开始发芽，发芽率为36%，而在7%氧气浓度下，种子第4天开始发芽，发芽率仅为3%。这些数据表明，沙枣种子的萌发对土壤类型、埋藏深度、水深、氧浓度高度敏感，这些反应可能是对环境变化适应不良的明确表现，也是造成该物种在三江平原衰落的重要原因。
Deyeuxia angustifolia is a dominant species in the Sanjiang Plain, the largest freshwater marsh wetland in China. However, this species has declined because of great environment changes. In the effects of sea-level rise and greenhouse gas, magnitude and frequency of flood and rate of deposit in wetland increased greatly. Thus, in this paper, effects of soil environment (soil type, burial depth, water depth and oxygen concentration) on seed germination of D. angustifolia were investigated. Both soil type and burial depth affected seedling emergence. Seedlings emerged through 1-, 2-, 4-mm sand, and at 1-and 2-mm mud. Regardless of soil, seedling emergence time increased and emergence percentage decreased with increasing burial depth. For example, seedlings started to emerge on the 4th day and the final emergence percentage was 30% when covered with1-mm mud, whereas the initial emergence time was on the 6th day and the final emergence percentage was only 8% when covered with 2-mm mud. At the same burial depth, emergence percentage was higher in sand than in mud. Increasing water depth inhibited seed germination. Germination percentage in 2-cm water level (20%) was 1.2 times higher than that in 12-cm water level (9%). Oxygen concentration also affected germination. In the 21% oxygen concentration, germination was started on the 2nd day and the germination percentage was 36%, while seed started to germinate on the 4th day and the germination percentage was only 3% at the 7% oxygen concentration. These data indicate that seed germination of D. angustifolia was highly sensitive to soil type, burial depth, water depth, oxygen concentration, and these responses may be an explicit indication of maladjustment to environment changes, and an important reason accounting for the decline of this species in the Sanjiang Plain.
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影响因子：
1.1
作者：
M. Maun;A. M. Payne
通讯作者：
M. Maun;A. M. Payne
影响因子：
2.7
作者：
Huang, ZY;Gutterman, Y
通讯作者：
Gutterman, Y
影响因子：
1.8
作者：
K. Hammerstrom;W. Kenworthy
通讯作者：
K. Hammerstrom;W. Kenworthy
影响因子：
3.9
作者：
C. Tarnócai
通讯作者：
C. Tarnócai
影响因子：
5.7
作者：
Joshi, AJ;Mali, BS;Hinglajia, H
通讯作者：
Hinglajia, H