| 黄土高原高塬沟壑区坡面表层土壤水分研究 |
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| 引用本文： | 张晶晶,王力.黄土高原高塬沟壑区坡面表层土壤水分研究[J].水土保持通报,2011,31(1):93-97. |
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| 作者姓名： | 张晶晶 王力 |
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| 作者单位： | 北京林业大学,水土保持学院水土保持与荒漠化防治教育部重点实验室,北京,100083 |
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| 基金项目： | 国家十一五科技支撑项目，高等学校博士学科点专项科研基金 |
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| 摘 要： | 在黄土高寒区,通过人工控制土壤水分的方法,利用Li-6400便携式光合测定系统对银水牛果和沙棘苗木叶片的气体交换参数因子的光响应进行研究。结果表明,2种灌木的净光合速率、蒸腾速率、水分利用效率随着光强的增大而增强,而随着光强进一步增大,净光合速率、水分利用效率却出现下降的趋势,蒸腾速率仍继续增大。随着土壤含水量的增加,2种灌木的净光合速率、蒸腾速率、气孔导度、胞间CO2浓度逐渐增大,水分利用效率先上升,在轻度水分胁迫下达到最大值后下降。在相同土壤含水量下,银水牛果光补偿点明显小于沙棘,光饱和点大于沙棘,光能利用率高于沙棘;银水牛果的表观量子效率大于沙棘,在低光强下的光合能力较高。在水分胁迫下,2种灌木相比,沙棘比银水牛果更易受强光胁迫;银水牛果对弱光的利用能力高于沙棘,水分利用效率高于沙棘,耐旱生产力较高。
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| 关 键 词： | 净光合速率 蒸腾速率 水分利用效率 光响应 |
| 收稿时间： | 7/3/2010 12:00:00 AM |
| 修稿时间： | 2010/7/30 0:00:00 |
Surface Soil Moisture Conditions in Gully Region of the Loess Plateau |
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| ZHANG Jing-jing and WANG Li.Surface Soil Moisture Conditions in Gully Region of the Loess Plateau[J].Bulletin of Soil and Water Conservation,2011,31(1):93-97. |
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| Authors: | ZHANG Jing-jing and WANG Li |
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| Institution: | DONG Mei,QIN Jing,HE Kang-ning,ZHANG Yi-yuan,LI An-chao,SUN Xiao-han,GUO Qian-qian(Key Laboratory of Soil and Water Conservation and Desertification Combating of the Ministry of Education,and College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China) |
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| Abstract: | In the alpine region of Loess Plateau,light responses of S.argentea and H.rhamnoides seedlings under different soil moisture conditions were analyzed in terms of gas exchange parameters using Li-6400 portable photosynthesis system.The results show that net photo-synthesis rate(Pn),transpiration rate(Tr) and water use efficiency(WUE) of the two species were both increased with PAR in the beginning.With continued increase of PAR,Pn and WUE of S.argentea and H.rhamnoides seedlings declined but Tr still increas... |
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| Keywords: | net photosynthesis rate transpiration rate water use efficiency light response |
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