应用生态学报2017，Vol.28Issue(7)：2155-2163,9.DOI:10.13287/j.1001-9332.201707.011
北京山区侧柏-荆条系统水分来源对降雨事件的响应
Response of water sources in Platycladus orientalis and Vitex negundo var.heterophylla system to precipitation events in mountain area of Beijing, China
摘要
Abstract
This study aimed to qualify the potential water sources and their responses to seasonal precipitations for the system of Platycladus orientalis and Vitex negundo var.heterophylla by IsoSource model based on stable hydrogen and oxygen isotopic analysis in Jiufeng Mountain area of Beijing.The results showed that the 18O of water from 0-20 cm soil layer was enriched,whereas that was depleted as the soil layer deepened.P.orientalis used water mainly from 0-30 cm soil layer,being composed of rainwater 2-3 days before at the beginning of dry season.The water absorbed by P.orientalis and V.negundo sourced from 0-10 cm and 10-30 cm soil layer,which was fed on recent rainwater at the end of dry season.In wet season P.orientalis mainly accessed the soil water (from 0-40 cm layer,59.3％) and recent rainwater (12.5％),while V.negundo drank the water from 0-30 cm soil layer derived from recent heavy rain.P.orientalis actively uptook the deeper soil water with time,until the end of growing season (November),its available water was from 60-80 cm soil layer and sourced from the rainwater happened 2-3 days before.Meanwhile,V.negundo completed its growing cycle and was on the brink of death.This system faced less competition for water use,stating its vertical water availability for climate adaptation in this region,which could reduce water and soil loss and minimize the instantaneous damage under heavy rainstorm attack.关键词
侧柏/荆条/IsoSource模型/水分来源/氢氧稳定同位素/降雨事件Key words
Platycladus orientalis/Vitex negundo var.heterophylla/IsoSource model/water source/hydrogen and oxygen stable isotopes/precipitation events引用本文复制引用
赵娜,孟平,何雅冰,娄源海,余新晓..北京山区侧柏-荆条系统水分来源对降雨事件的响应[J].应用生态学报,2017,28(7):2155-2163,9.基金项目
本文由国家自然科学基金项目(41430747)和北京市教委项目(CEFF-PXM2016_014207_000038)资助 This work was supported by the National Natural Science Foundation of China (41430747) and the Beijing Municipal Education Commission (CEFF-PXM2016_014207_000038). （41430747）
