| 荒漠植物沙拐枣群体光合作用及土壤呼吸研究 |
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| 引用本文： | 苏培玺,周紫鹃,张海娜,李善家,解婷婷.荒漠植物沙拐枣群体光合作用及土壤呼吸研究[J].北京林业大学学报,2013,35(3):56-64. |
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| 作者姓名： | 苏培玺 周紫鹃 张海娜 李善家 解婷婷 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所临泽内陆河流域研究站,中国科学院寒旱区陆面过程与气候变化重点实验室 |
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| 基金项目： | "973"国家重点基础研究发展计划课题，国家自然科学基金项目 |
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| 摘 要： | 为了探讨荒漠植物群体光合作用和干旱荒漠区碳源汇特征,联合利用改进同化箱和LI鄄8100 土壤CO2 通量自 动测量系统,选择高温强光和适宜环境期,连续2 年进行了观测研究。结果表明:沙拐枣群体光合速率(CAP)在不 同年份、不同月份差异较大,土壤水分改善可显著提高群体光合能力,高温强光期和适宜环境期日平均(08:00— 18:00)CAP 分别为1郾82 和2郾89 滋mol / (m2·s);用同化枝水平光合速率(Pn )计算群体水平光合速率时,高温强光 期和适宜环境期分别用公式CAP = 0.12Pn + 0.39 (r = 0.86, P 0.000 1)和CAP = 0.18Pn + 0.28 (r = 0.92, P 0.000 1)。沙拐枣生长期植冠下土壤CO2 释放速率平均为0.29 滋mol/ (m2·s),荒漠裸地为0.15 μmol / (m2·s)。沙 拐枣群体生长期固定碳为3.82 g/ (m2·a);相应时期植冠下土壤释放碳为1.03 g/ (m2·a),荒漠裸地为0.53 g/ (m2· a)。研究表明:在水分短缺的荒漠地区,荒漠植物沙拐枣群体光合速率提高幅度超过根系主要分布层土壤水分提 高幅度,适宜环境期可提高近1 倍。荒漠生态系统土壤呼吸速率较低,荒漠裸地土壤呼吸速率约为植冠下的50%。 荒漠植物沙拐枣种群区为弱碳源
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| 关 键 词： | 荒漠 群体光合速率 土壤CO2 释放速率 碳平衡 |
| 收稿时间： | 1900-01-01 |
Canopy photosynthesis and soil respiration of desert plant Calligonum potanini |
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| SU Pei-xi; ZHOU Zi-juan; ZHANG Hai-na; LI Shan-jia; XIE Ting-ting.Canopy photosynthesis and soil respiration of desert plant Calligonum potanini[J].Journal of Beijing Forestry University,2013,35(3):56-64. |
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| Authors: | SU Pei-xi; ZHOU Zi-juan; ZHANG Hai-na; LI Shan-jia; XIE Ting-ting |
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| Institution: | Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Chinese Academy of Sciences; Lanzhou, 730000, P. R. China. |
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| Abstract: | In order to explore canopy photosynthesis of desert plant Calligonum potanini, and characteristics of carbon source and carbon sink in arid desert area, the canopy apparent photosynthesis and soil CO2 efflux rate were measured in high temperature and irradiation and suitable environment periods by the modified assimilation chamber and LI-8100 automated soil CO2 flux system in two years. The results showed that the difference of canopy apparent photosynthetic rate (CAP) of C. potanini in different years and months was significant, the canopy photosynthesis was enhanced significantly with improving soil water, the average CAP (08:00- - 18:00) was 1.82 μmol/(m2·s) in high temperature and irradiation period and 2.89 μmol/(m2·s) in suitable environment period, respectively. The calculated formula of CAP by photosynthetic rate of assimilating shoots (Pn) was CAP=0.12Pn+0.39 (r=0.86, P<0.000 1) in high temperature and irradiation period and CAP=0.18Pn+0.28 (r=0.92, P<0.000 1) in suitable environment period. The soil CO2 efflux rate under plant canopy was 0.29 μmol/(m2·s) in growth period, and it was 0.15 μmol/(m2·s) in desert bare land. The fixed carbon of C. potanini canopy in growth period was 3.82 g/(m2·a), the released carbon under plant canopy was 1.03 and 0.53 g/(m2·a) in desert bare land in the same period. These results indicated that the increasing in canopy apparent photosynthetic rate of desert plant C. potanini exceeded the increasing range of soil water in the layers of root mainly distributed in the water shortage desert area; it doubled in suitable environment period. The soil respiration rate of desert ecosystem was lower and that in desert bare land was about 50% of that under plant canopy. The zone of desert plant C. potanini population was a weak carbon source. |
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| Keywords: | desert canopy apparent photosynthetic rate soil CO2 efflux rate carbon balance |
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