生态学杂志2012，Vol.31Issue(9)：2197-2202,6.
模拟岩溶水分供应分层的干旱胁迫对青冈栎光合特性和生长的影响
Effects of drought stress on the photosynthesis and growth of Cyclobalanopsis glauca seedlings: A study with simulated hierarchical karst water supply
摘要
Abstract
Based on the geological characteristics of karst environment, a simulated hierarchical columniation of water supply (soil layer-epikarst layer-rock layer) was built up, and a gradient of soil moisture content (severe drought, medium drought, suitable soil moisture, and saturated soil moisture corresponding to 30% -40% , 50% -60% , 70% -80% , and 90% -100% of field moisture capacity, respectively) was installed to investigate the photosynthesis and growth of 2-year-old Cyclobalanopsis glauca seedlings under the simulated karst environment. The results showed that soil drought stress decreased the growth of the seedlings basal diameter and branch significantly (P＜0. 01), but had less effects on the basal diameter growth when the water in epikarst layer was available. The photosynthesis-light response curve of the seedlings fitted the nohrectangular hyperbola model well, meaning an agreement between the model and the actual response of the seedlings photosynthesis, and the light response curve under different soil moisture conditions had the similar variation trend. The maximum net photosynthetic rate (Pmax) and the apparent quantum yield (AQY) of the seedlings under different soil moisture conditions were in the order of saturated soil moisture ＞ suitable soil moisture ＞ medium drought ＞ severe drought. Soil drought stress decreased the light saturation point (LSP) and increased the light compensation point (LCP) , but the LSP and LCP changed irregularly when the water in epikarst layer was available.关键词
表层岩溶带/干旱胁迫/双层结构/光响应Key words
epikarst layer/ drought stress/ bi-layer structure/ light response.分类
农业科技引用本文复制引用
张中峰,尤业明,黄玉清,李先琨,张金池,张德楠,何成新..模拟岩溶水分供应分层的干旱胁迫对青冈栎光合特性和生长的影响[J].生态学杂志,2012,31(9):2197-2202,6.基金项目
国家自然科学基金项目(40872198、41172313)、岩溶动力学重点实验室项目(kdl2008-09)、中国地质调查局工作项目(1212011220059)、国家科技支撑计划项目(2011BAC09B02)和广西植物研究所科学研究基金项目(桂植业1002-09014)资助. （40872198、41172313）
