林业科学2016，Vol.52Issue(9)：22-30,9.DOI:10.11707/j.1001-7488.20160903
北京山区侧柏和栓皮栎的水分利用特征
Water Use Characteristics of Platycladus orientalis and Quercus variabilis in Beijing Mountain Area
摘要
Abstract
Objective]In order to provide reference and theoretical basis for vegetation construction in Beijing mountain areas,this study investigated water utilization of typical arbors of Platycladus orientalis and Quercus variabilis in Beijing mountainous area. [Method]We measured stable isotopic values of hydrogen and oxygen of water in the xylem and different water sources by using multi-source linear mixed models ( Iso-Source ) . In combination with the thermal dissipation probe measurement ( TDP) ,we analyzed the contribution rate and amount of different water sources to the two tree species. [Result]Results show that:1) in dry and rain period,the sap fluid flux was in the order of: P. orientalis in dry period (5. 87 kg) < Q. variabilis in dry period (9. 42 kg) < P. orientalis in rain period (13. 42 kg) < Q. variabilis in rain period (18. 26 kg). 2) P. orientalis up-took water from 60-80 cm soil layer and underground water in the dry season,and the contribution rate was 19. 8% and 51. 4%,respectively,and the average daily use rate was 1. 16 kg and 1. 16 kg. In the rainy season,P. orientalis consumed top layer ( 0 - 20 cm ) soil water and groundwater,and the utilization rate was 51. 4% and 27. 7%,respectively,and the average daily use was 6. 90 kg and 3. 72 kg. 3 ) Q. variabilis up-took water from 0 -20 cm and 60 -80 cm soil layers in dry period,and the utilization rate of 53. 5% and 20. 2%,respectively,and the average daily use was 5. 04 kg and 1. 9 kg. In the rainy season time,Q. variabilis up-took water from 0 - 20 cm soil layer and shallow underground water,and the utilization rate was 51. 8% and 38. 1%, respectively,and the average daily use was 9. 46 kg and 6. 96 kg. [Conclusion]In terms of the water use characteristics of P. orientalis and Q. variabilis,two species had similar utilization of water source depth. Thus in afforestation,the two species should not be mixed together to avoid competition for water sources. In Beijing mountainous area with seasonal drought,less water consumption species of P. orientalis should be selected for afforestation.关键词
侧柏/栓皮栎/水分来源/稳定氢氧同位素Key words
Platycladus orientalis/Quercus variabilis/water source/the stable hydrogen and oxygen isotopes分类
农业科技引用本文复制引用
刘自强,余新晓,贾国栋,贾剑波,娄源海,张坤..北京山区侧柏和栓皮栎的水分利用特征[J].林业科学,2016,52(9):22-30,9.基金项目
国家自然科学基金重点项目“基于稳定同位素的典型森林生态系统水、碳过程及其耦合机制研究”(41430747) （41430747）
青年科学基金项目“北京山区主要造林树种水分利用机制及其生理生态响应研究”(41401013)。 （41401013）
