植物生态学报 ›› 2013, Vol. 37 ›› Issue (7): 591-600.DOI: 10.3724/SP.J.1258.2013.00061
所属专题: 稳定同位素生态学
• 研究论文 • 下一篇
冯秋红1,2,程瑞梅1,史作民1,*(),刘世荣1,王卫霞1,刘兴良2,何飞2
收稿日期:
2012-12-28
接受日期:
2013-06-04
出版日期:
2013-12-28
发布日期:
2013-07-05
通讯作者:
史作民
基金资助:
FENG Qiu-Hong1,2,CHENG Rui-Mei1,SHI Zuo-Min1,*(),LIU Shi-Rong1,WANG Wei-Xia1,LIU Xing-Liang2,HE Fei2
Received:
2012-12-28
Accepted:
2013-06-04
Online:
2013-12-28
Published:
2013-07-05
Contact:
SHI Zuo-Min
摘要:
在卧龙自然保护区, 按海拔梯度选择了齿果酸模(Rumex dentatus)的4个分布地点(2350、2700、3150和3530 m), 对各研究地点的齿果酸模进行了叶片光合、扩散导度、叶片碳稳定同位素组成(δ13C)、氮素含量、光合氮利用效率(PNUE)、比叶面积(SLA))等参数的测量, 以期揭示该植物叶片氮素、氮素分配情况及其他生理生态参数随海拔的响应趋势, 进而明确氮素及其分配在齿果酸模响应和适应海拔梯度环境的生物学过程中的作用。结果表明: 随着海拔的升高, 齿果酸模的叶片单位面积氮含量(Narea)随之增加, 进而光合能力随之增加。随着海拔升高而增加的扩散导度也在一定程度上促进了这一趋势, 这可能是落叶草本植物对于高海拔低温所导致的叶寿命缩短的适应结果。沿着海拔梯度, 植物叶片氮素和扩散导度均通过羧化位点与外界CO2分压比(Pc/Pa)而间接影响叶片δ13C值, 且相比之下, 以氮素为基础的羧化能力对于Pc/Pa的作用更大些, 进而导致齿果酸模叶片δ13C随海拔增加; 随着海拔的升高, 齿果酸模叶片将更多的氮素用于防御性结构组织的建设, 这也是SLA和PNUE降低的主要原因; 在光合系统内部, 随着海拔的升高, 植物光合组织增加了用于捕光系统氮素的比例, 使得植物可以更好地利用随海拔升高而增强的光照资源, 进而促进了光合能力的增加。可见, 氮素及其在叶片各系统间(尤其是在光合系统与非光合系统间)的分配方式是齿果酸模适应和响应海拔梯度环境的关键。
冯秋红,程瑞梅,史作民,刘世荣,王卫霞,刘兴良,何飞. 四川巴郎山齿果酸模叶片氮素及其分配的海拔响应. 植物生态学报, 2013, 37(7): 591-600. DOI: 10.3724/SP.J.1258.2013.00061
FENG Qiu-Hong,CHENG Rui-Mei,SHI Zuo-Min,LIU Shi-Rong,WANG Wei-Xia,LIU Xing-Liang,HE Fei. Response of Rumex dentatus foliar nitrogen and its allocation to altitudinal gradients along Balang Mountain, Sichuan, China. Chinese Journal of Plant Ecology, 2013, 37(7): 591-600. DOI: 10.3724/SP.J.1258.2013.00061
海拔 Altitude (m) | 经纬度 Longitude and latitude | 生境情况 Habitat situation |
---|---|---|
2 350 | 103°03′57.3″ E, 30°52′58.3″ N | 阳坡, 高山柳林下缘 Sunny slope, lower edge of alpine willow |
2 700 | 102°58′ 33.8″ E, 30°51′47.5″ N | 阳坡, 高山栎林下缘 Sunny slope, lower edge of alpine oak |
3 150 | 102°58′ 44.5″ E, 30°52′58.3″ N | 阳坡, 高山柳林下缘 Sunny slope, lower edge of alpine willow |
3 530 | 102°57′ 48.1″ E, 30°52′06.8″ N | 阳坡, 高山草甸 Sunny slope, alpine meadow |
表1 研究地点地理位置及生境概况
Table 1 Geographic location and habitat situation of sites
海拔 Altitude (m) | 经纬度 Longitude and latitude | 生境情况 Habitat situation |
---|---|---|
2 350 | 103°03′57.3″ E, 30°52′58.3″ N | 阳坡, 高山柳林下缘 Sunny slope, lower edge of alpine willow |
2 700 | 102°58′ 33.8″ E, 30°51′47.5″ N | 阳坡, 高山栎林下缘 Sunny slope, lower edge of alpine oak |
3 150 | 102°58′ 44.5″ E, 30°52′58.3″ N | 阳坡, 高山柳林下缘 Sunny slope, lower edge of alpine willow |
3 530 | 102°57′ 48.1″ E, 30°52′06.8″ N | 阳坡, 高山草甸 Sunny slope, alpine meadow |
海拔 Altitude (m) | A (μmol·m-2·s-1) | Rd (μmol·m-2·s-1) | Amax (μmol·m-2·s-1) | Vcmax (μmol·m-2·s-1) | Jmax (μmol·m-2·s-1) | Jmax/Vcmax |
---|---|---|---|---|---|---|
2 350 | 11.68 ± 1.03Cc | 1.90 ± 0.25Bb | 40.46 ± 8.14Bb | 84.13 ± 12.15Bb | 317.49 ± 73.33Bb | 3.92 ± 0.39Ba |
2 700 | 13.90 ± 1.83Cc | 2.21 ± 0.17ABab | 49.75 ± 3.69Aab | 111.31 ± 9.69Aa | 397.14 ± 31.12ABab | 4.21 ± 0.37Ba |
3 150 | 17.28 ± 2.12ABab | 2.22 ± 0.17ABab | 50.69 ± 3.55Aa | 90.80 ± 14.24Bab | 414.25 ± 33.22Aa | 4.59 ± 0.51ABa |
3 530 | 20.20 ± 4.21Aa | 2.44 ± 0.31Aa | 55.41 ± 4.41Aa | 98.29 ± 13.89ABab | 467.02 ± 60.55Aa | 5.11 ± 1.03Aa |
表2 不同海拔齿果酸模叶片的光合参数
Table 2 Foliar photosynthetic parameters of Rumex dentatus among different altitudes
海拔 Altitude (m) | A (μmol·m-2·s-1) | Rd (μmol·m-2·s-1) | Amax (μmol·m-2·s-1) | Vcmax (μmol·m-2·s-1) | Jmax (μmol·m-2·s-1) | Jmax/Vcmax |
---|---|---|---|---|---|---|
2 350 | 11.68 ± 1.03Cc | 1.90 ± 0.25Bb | 40.46 ± 8.14Bb | 84.13 ± 12.15Bb | 317.49 ± 73.33Bb | 3.92 ± 0.39Ba |
2 700 | 13.90 ± 1.83Cc | 2.21 ± 0.17ABab | 49.75 ± 3.69Aab | 111.31 ± 9.69Aa | 397.14 ± 31.12ABab | 4.21 ± 0.37Ba |
3 150 | 17.28 ± 2.12ABab | 2.22 ± 0.17ABab | 50.69 ± 3.55Aa | 90.80 ± 14.24Bab | 414.25 ± 33.22Aa | 4.59 ± 0.51ABa |
3 530 | 20.20 ± 4.21Aa | 2.44 ± 0.31Aa | 55.41 ± 4.41Aa | 98.29 ± 13.89ABab | 467.02 ± 60.55Aa | 5.11 ± 1.03Aa |
海拔 Altitude (m) | 气孔导度 Gs (mol·m-2·s-1) | 叶肉细胞导度 Gm (mol·m-2·s-1) | 羧化位点与外界CO2分压比 Pc/Pa | 稳定碳同位素比值 δ13C (‰) |
---|---|---|---|---|
2 350 | 0.19 ± 0.02Bbc | 0.21 ± 0.06Cc | 0.53 ± 0.02Ba | -30.65 ± 0.27Cc |
2 700 | 0.17 ± 0.02Bc | 0.30 ± 0.08Bbc | 0.38 ± 0.04Cb | -28.25 ± 0.45Bb |
3 150 | 0.30 ± 0.07Aab | 0.36 ± 0.09ABab | 0.60 ± 0.08ABa | -28.14 ± 0.58Bab |
3 530 | 0.31 ± 0.10Aa | 0.44 ± 0.07Aa | 0.57 ± 0.09ABa | -27.52 ± 0.47Aa |
表3 不同海拔齿果酸模叶片的扩散导度和叶片稳定碳同位素比值
Table 3 Foliar diffusional conductance and stable carbon isotope ratio of Rumex dentatus among different altitudes
海拔 Altitude (m) | 气孔导度 Gs (mol·m-2·s-1) | 叶肉细胞导度 Gm (mol·m-2·s-1) | 羧化位点与外界CO2分压比 Pc/Pa | 稳定碳同位素比值 δ13C (‰) |
---|---|---|---|---|
2 350 | 0.19 ± 0.02Bbc | 0.21 ± 0.06Cc | 0.53 ± 0.02Ba | -30.65 ± 0.27Cc |
2 700 | 0.17 ± 0.02Bc | 0.30 ± 0.08Bbc | 0.38 ± 0.04Cb | -28.25 ± 0.45Bb |
3 150 | 0.30 ± 0.07Aab | 0.36 ± 0.09ABab | 0.60 ± 0.08ABa | -28.14 ± 0.58Bab |
3 530 | 0.31 ± 0.10Aa | 0.44 ± 0.07Aa | 0.57 ± 0.09ABa | -27.52 ± 0.47Aa |
海拔 Altitude (m) | Nmass (g·100g-1) | Narea (g·m-2) | PR (g·g-1) | PB (g·g-1) | PNUE (μmol·mol-1·s-1) | SLA (cm2·g-1) |
---|---|---|---|---|---|---|
2 350 | 3.59 ± 0.22 Bb | 1.16 ± 0.07Dc | 0.46 ± 0.07ABa | 0.19 ± 0.01Aa | 153.32 ± 31.62Aa | 288.31 ± 34.29Aa |
2 700 | 4.10 ± 0.57Aa | 1.68 ± 0.08Cb | 0.49 ± 0.03Aa | 0.20 ± 0.02Aa | 127.28 ± 16.23ABa | 242.61 ± 25.60Bb |
3 150 | 3.82 ± 0.16ABab | 1.78 ± 0.08Bb | 0.39 ± 0.09BCa | 0.19 ± 0.02Aa | 122.09 ± 16.94ABa | 217.85 ± 10.52BCbc |
3 530 | 3.72 ± 0.09ABab | 1.90 ± 0.04Aa | 0.33 ± 0.10Ca | 0.18 ± 0.01Aa | 114.46 ± 0.09Ba | 197.59 ± 6.78Cc |
表4 不同海拔齿果酸模叶片氮含量、光合氮利用效率及比叶面积
Table 4 Leaf nitrogen content, photosynthetic nitrogen use efficiency and special leaf area of Rumex dentatus among different altitudes
海拔 Altitude (m) | Nmass (g·100g-1) | Narea (g·m-2) | PR (g·g-1) | PB (g·g-1) | PNUE (μmol·mol-1·s-1) | SLA (cm2·g-1) |
---|---|---|---|---|---|---|
2 350 | 3.59 ± 0.22 Bb | 1.16 ± 0.07Dc | 0.46 ± 0.07ABa | 0.19 ± 0.01Aa | 153.32 ± 31.62Aa | 288.31 ± 34.29Aa |
2 700 | 4.10 ± 0.57Aa | 1.68 ± 0.08Cb | 0.49 ± 0.03Aa | 0.20 ± 0.02Aa | 127.28 ± 16.23ABa | 242.61 ± 25.60Bb |
3 150 | 3.82 ± 0.16ABab | 1.78 ± 0.08Bb | 0.39 ± 0.09BCa | 0.19 ± 0.02Aa | 122.09 ± 16.94ABa | 217.85 ± 10.52BCbc |
3 530 | 3.72 ± 0.09ABab | 1.90 ± 0.04Aa | 0.33 ± 0.10Ca | 0.18 ± 0.01Aa | 114.46 ± 0.09Ba | 197.59 ± 6.78Cc |
图1 齿果酸模单位面积氮含量(Narea)、光合氮利用效率(PNUE)和最大净光合速率(Amax)间的关系。
Fig. 1 Relationship between nitrogen content per area (Narea), photosynthetic nitrogen use efficiency (PNUE) and maximum net photosynthetic rate (Amax) of Rumex dentatus.
图2 齿果酸模单位面积氮含量(Narea)、光合氮利用效率(PNUE)和比叶面积(SLA)间的关系。
Fig. 2 Relationships between nitrogen content per area (Narea), photosynthetic nitrogen use efficiency (PNUE) and specific leaf area (SLA) of Rumex dentatus.
图3 齿果酸模气孔导度(Gs)、叶肉细胞导度(Gm)、最大羧化速率(Vcmax)和羧化位点与外界CO2分压比(Pc/Pa)间的关系。
Fig. 3 Relationship between stomatal conductance (Gs), mesophyll conductance (Gm), maximum carboxylation rate (Vcmax) and ratio of chloroplast partial pressure of CO2 to ambient CO2 partial pressure (Pc/Pa) of Rumex dentatus.
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