| 陕北沙地3种典型灌木根木质部解剖结构及水力特性 |
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| 引用本文： | 艾绍水,李秧秧,陈佳村,陈伟月.陕北沙地3种典型灌木根木质部解剖结构及水力特性[J].生态学杂志,2015,26(11):3277-3284. |
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| 作者姓名： | 艾绍水 李秧秧 陈佳村 陈伟月 |
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| 作者单位： | (;1.西北农林科技大学林学院, 陕西杨凌 712100; ;2.西北农林科技大学水土保持研究所， 陕西杨凌 712100； ;3.中国科学院水利部水土保持研究所， 陕西杨凌 712100) |
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| 摘 要： | 比较了陕北沙地沙柳、柠条和沙棘3种典型灌木不同土壤深度(0～20和30～50 cm)根木质部解剖结构和水力特性.结果表明： 沙柳具有较高的叶水势，根木质部导管平均最大直径(dmax)、平均最小直径(dmin)、平均导管面积(Alum)以及导管面积占木质部面积比例(Aves/Axyl)显著高于柠条和沙棘，根导管密度(VD)与沙棘相当但显著高于柠条；沙柳根的比导水率分别为柠条和沙棘的5.0和2.8倍；沙柳根栓塞脆弱性指数与柠条根相当，但显著高于沙棘根.表明沙柳属耗水型水分利用策略，而柠条和沙棘属节水型水分利用策略，且柠条更耐旱.3种灌木在2个土层深度的dmax、dmin和Alum无显著差异，但30～50 cm土层根VD和Aves/Axyl显著高于表层；30～50 cm土层根比导水率显著高于表层根，但脆弱性指数小于表层根，深层根具有高的水分传输效率和低的水力脆弱性.
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| 关 键 词： | 沙地 灌木根 木质部解剖结构 水力特性 |
Root anatomical structure and hydraulic traits of three typical shrubs on the sandy lands of northern Shaanxi Province,China. |
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| AI Shao-shui,LI Yang-yang,CHEN Jia-cun,CHEN Wei-yue.Root anatomical structure and hydraulic traits of three typical shrubs on the sandy lands of northern Shaanxi Province,China.[J].Chinese Journal of Ecology,2015,26(11):3277-3284. |
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| Authors: | AI Shao-shui LI Yang-yang CHEN Jia-cun CHEN Wei-yue |
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| Institution: | (;1.College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China; ;Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China; ;Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China) |
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| Abstract: | Root xylem anatomical structure and hydraulic traits of three typical shrubs, i.e., Salix psammophila, Caragana korshinskii and Hippophae rhamnoides, within two soil layers (0-20 cm and 30-50 cm) were compared. The results showed that S. psammophila had a higher leaf water potential than C. korshinskii and H. rhamnoides, the average maximum and minimum lumen diameter (dmax and dmin, respectively), the average lumen area of vessels (Alum) and the ratio of lumen area of all vessels to xylem area (Aves/Axyl) in S. psammophila roots were also significantly higher than those in C. korshinskii and H. rhamnoides, and the root vessel density (VD) in S. psammophila was the same as that in H. rhamnoides but significantly higher than that in C. korshinskii. Root hydraulic conductivity in S. psammophila was 5 times of C. korshinskii and 2.8 times of H. hamnoides. The vulnerability index in S. psammophila roots was similar to that in C. korshinskii but higher than that in H. hamnoides. S. psammophila belonged to a water spending species, whereas both C. korshinskii and H. rhamnoides were water saving species, and C. korshinskii was more drought resistant than H. rhamnoides. There was no difference of dmax, dmin and Alum between roots in two soil layers, but roots within in the 30-50 cm soil layer had larger VD and Aves/Axyl. The root specific hydraulic conducti vity within the 30-50 cm soil layer was significantly higher than within the surface soil layer, whereas the vulnerability index within the 30-50 cm soil layer was smaller, indicating roots in deep soil layers had higher hydraulic transport efficiency and lower hydraulic vulnerability. |
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| Keywords: | sandy land shrub root xylem anatomical structure hydraulic trait |
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