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

生态学杂志 ›› 2012, Vol. 31 ›› Issue (09): 2197-2202.

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

张中峰^1,2,尤业明³,黄玉清¹,李先琨¹,张金池²,张德楠⁴,何成新^1**

（¹广西壮族自治区中国科学院广西植物研究所，广西桂林 541006； ²南京林业大学森林资源与环境学院，南京 210037； ³北京林业大学林学院，北京 100083; ⁴广西师范大学生命科学院，广西桂林 541002）

出版日期:2012-09-10 发布日期:2012-09-10

Effects of drought stress on the photosynthesis and growth of Cyclobalanopsis glauca seedlings: A study with simulated hierarchical karst water supply.

ZHANG Zhong-feng^1,2, YOU Ye-ming³, HUANG Yu-qing¹, LI Xian-kun¹, ZHANG Jin-chi², ZHANG De-nan⁴, HE Cheng-xin^1**

(¹Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, Guangxi, China; ²College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China; ³College of Forestry, Beijing Forestry University, Beijing 100083, China; ⁴College of Life Sciences, Guangxi Normal University, Guilin 541002, Guangxi, China)

Online:2012-09-10 Published:2012-09-10

摘要/Abstract

摘要： 根据喀斯特地质特点，建立水分供应分层模拟柱（土壤层-岩石层-岩溶水层），并设置不同土壤水分梯度：重度干旱、中度干旱、水分适宜和水分饱和（相当于土壤田间持水量的30%～40%、50%～60%、70%～80%和90%～100%），研究2年生青冈栎（Cyclobalanopsis glauca）苗木在模拟喀斯特生境下地经生长量、枝条生长量、光合曲线特征以及光合参数变化。结果表明：土壤干旱胁迫能显著降低青冈栎地径和枝条生长量，但在岩溶层有水的条件下，地径生长量不受土壤干旱胁迫影响；青冈栎的光合作用-光响应曲线符合非直角双曲线函数模型，不同处理光响应曲线的变化趋势基本一致；最大净光合速率和表观量子效率均表现为水分饱和＞水分适宜＞中度干旱＞重度干旱；土壤干旱胁迫使青冈栎光饱和点降低、光补偿点升高，但岩溶水层有水时情况发生改变。

关键词: 中亚热带人工林, 光能利用效率, 光化学植被指数, 环境因子, 水分状况

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 nonrectangular 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 (P_max) 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.

Key words: mid-subtropical planted coniferous forest, light-use efficiency, photochemical reflectance index, environmental factors, water conditions.

张中峰1,2,尤业明3,黄玉清1,李先琨1,张金池2,张德楠4,何成新1**. 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(09): 2197-2202.

ZHANG Zhong-feng1,2, YOU Ye-ming3, HUANG Yu-qing1, LI Xian-kun1, ZHANG Jin-chi2, ZHANG De-nan4, HE Cheng-xin1**. Effects of drought stress on the photosynthesis and growth of Cyclobalanopsis glauca seedlings: A study with simulated hierarchical karst water supply.[J]. cje, 2012, 31(09): 2197-2202.

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