| 雨季北京山区3种典型植物的水分来源 |
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| 引用本文： | 邓文平,余新晓,贾国栋,李亚军,刘瑜洁.雨季北京山区3种典型植物的水分来源[J].干旱区研究,2014,31(4):649-657. |
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| 作者姓名： | 邓文平 余新晓 贾国栋 李亚军 刘瑜洁 |
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| 作者单位： | （北京林业大学,教育部水土保持与荒漠化防治重点实验室，北京 100083） |
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| 基金项目： | 国家自然科学基金面上项目（41171028） |
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| 摘 要： | 水分是植物生长、初级生产力形成以及生态系统稳定的主要控制因素。为了深入探讨在雨季降雨后侧柏（Platycladus orientali）、栓皮栎（Quercus variabilis）和荆条（Vitex negundo var.heterophylla）的水分来源，根据降水、土壤水、地下水及植物茎干水分同位素特征，采用直接对比法和多源线性混合模型（Isosource）开展系统研究。结果显示：① 在雨后，侧柏主要利用表层0~10 cm的土壤水分和80 cm以下的深层土壤水分，它们对侧柏的水分贡献率分别为35.8%和55.6%，而对中间层(10~80 cm)土壤水分的利用较少；② 栓皮栎的水分来源与侧柏相似，但是对深层土壤水分的利用率比侧柏大，而对浅层土壤水分的利用率比侧柏小，这两层土壤水分的贡献率分别为17.7%和77.2%；③ 荆条的水分来源比较复杂，但主要来源仍然是表层0~10 cm的土壤水分，表层水分对其水分的贡献率为46.6%，而且对其他土层水分都有利用；在雨后，土壤水分充足的条件下，不同物种间水分利用模式仍有差异，从而促进了对土壤水分的有效利用，缓解了半干旱区物种间的水分竞争，这对我国北方山区生态恢复物种选择具有重要的参考价值。
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| 关 键 词： | 侧柏(Platycladus orientali) 栓皮栎(Quercus variabilis) 荆条(Vitex negundo var.heterophylla) 雨季 土壤水分 稳定同位素 山区 北京 |
| 收稿时间： | 2013-01-24; |
Water Sources of Three Typical Plants in the BeijingMountain Areas in Rainy Season |
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| DENG Wen-Ping,YU Xin-Xiao,JIA Guo-Dong,LI Ya-Jun,LIU Yu-Jie.Water Sources of Three Typical Plants in the BeijingMountain Areas in Rainy Season[J].Arid Zone Research,2014,31(4):649-657. |
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| Authors: | DENG Wen-Ping YU Xin-Xiao JIA Guo-Dong LI Ya-Jun LIU Yu-Jie |
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| Abstract: | Water is the most important factor affecting plant growth, primary production and ecosystem stability in rocky mountain areas in north China. In the rocky mountain areas in north China, there are three main plant species including Platycladus orlentalis, Quercus variabilis and Vitex negundo var. heterophylla, and they adapt to the dead soils well in such arid region and play an important role in vegetation regeneration in Beijing mountain areas. In order to understand the water sources of these species after rainfall in rainy season, the direct inference of hydrogen and oxygen isotopes and multi source mass balance assessment were used to estimate the water sources of these plant species based on the characteristics of stable isotopes of rainwater, soil water, groundwater and plant xylem water. The results were as follows: ① After rainfall, Platycladus orlentalis used mainly the upper soil (0-10 cm) water (35.8%) and the deep soil (deeper than 80 cm) water (55.6%); ② The water sources of Q. variabilis were similar to those of P. orlentalis, the utilization rate of deep soil water was higher than that of P. orlentalis,but that of upper soil water was lower. The utilization rates of shallow soil water and deep soil water were 17.7% and 77.2% respectively; ③ The water sources of Q. variabilis were the most complicated, but the proportion of upper soil (0-10 cm) water was still dominant (46.6%). Our findings revealed that there was a difference of water use modes among plant species, thus the effective utilization of soil water was improved, the interspecific water competition in the semiarid ecosystem was reduced, and these were important for the species selection in ecological regeneration in the rocky mountain areas in north China. |
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