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cje ›› 2011, Vol. 30 ›› Issue (04): 664-669.

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Changes of Cyclobalanopsis glauca water parameters under drought stress in karst environment.

ZHANG Zhong-feng1, HUANG Yu-qing1, YOU Ye-ming2, HE Cheng-xin1**, ZHU Fang1,3, LI Yan-yu1,3   

  1. 1Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and the Chinese Academy of Sciences, Guilin 541006, Guangxi, China|2College of Forestry, Beijing Forestry University, Beijing 100083, China|3College of Life Sciences, Guangxi Normal University, Guilin 541002, Guangxi, China
  • Online:2011-04-08 Published:2011-04-08

Abstract: By using a water supply device with epikarst water-limestone-soil columniation to simulate karst environment, and adopting press-volume (P-V) technique, a water-controlled experiment was conducted to study the changes of Cyclobalanopsis glaucawater parameters including daily water potential (P), water potential at saturated point (ψsats), water potential at turgor loss point (ψtlps), relative osmotic water content at turgor loss point (ROWCtlp), relative water content at turgor loss point (RWCtlp), relative content of apoplastic water (AWC), and the difference between ψsats and ψtlps(ΔP) under drought stress. In treatment no-epikarst water-limestone-soil, the ROWCtlp, RWCtlp, ψsats, and ψtlps decreased and the AWC increased with intensifying soil drought; while in treatment epikarst water-limestone-soil, these water parameters had no significant changes along with soil water variation. Under no-epikarst water condition, the water parameters of C. glauca were predominantly affected by soil water content, and the drought tolerance of C. glauca was enhanced with increasing soil drought in a certain range of drought stress.

Key words: CO2 concentration enrichment, Soil moisture, Nitrogen fertilizer rates, Evapotranspiration, WUE