Chinese Journal of Plant Ecology >
Hydraulic regulation strategies of karst forest species exhibit variation across different successional stages in the mid-subtropical zone
- Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuangzu Autonomous Region and Chinese Academy of Sciences, Guangxi Guilin Urban Ecosystem National Observation and Research Station, Guilin, Guangxi 541006, China
Received date: 2024-01-05
Accepted date: 2024-04-08
Online published: 2024-04-08
Supported by
National Natural Science Foundation of China(32060243);National Natural Science Foundation of China(41830648)
Abstract
Aims The karst region encounters challenges such as low resistance to drought and delayed succession due to extensively exposed rocks and shallow soil layers, rendering the surface susceptible to dehydration. The study aims to investigate changes in hydraulic regulation strategies during different successional stages of species of subtropical karst forests. This exploration seeks to understand the mechanisms for adapting to drought following succession, and to establish a theoretical basis for vegetation restoration and reconstruction.
Methods The study centered on dominant species in forest communities along the early, middle, and late stages of succession in karst areas. Various hydraulic traits including the vulnerability of embolism in stems and leaves (P50S and P50L), the vulnerability segmentation (P50L-S), the specific conductivity of stems and leaves (KS and KL), the hydraulic safety margin of leaf (HSML), density of sapwood, the Huber value, and the specific leaf area (SLA) were investigated.
Important findings (1) No trade-off was found between hydraulic safety and efficiency at either species or community level; P50S, KS, and KL all decreased along the succession. (2) All species exhibited positive vulnerability segmentation, ranging from 0.53 to 6.59 MPa, and the vulnerability segmentation during early succession significantly exceeded those in the middle and late stages of succession. Furthermore, P50S was identified as the primary determinant of the vulnerability segmentation. (3) The plants at early successional stage exhibited higher resistance to embolism, KS, and KL, which enhance the abilities of water transport and drought resistance. Conversely, in the later stage, plants showed larger SLA to improve competition for light resources. Our study reveals the patterns of adjustment of hydraulic regulation strategies, shifting from strategies aimed at improving hydraulic efficiency and safety to strategies aimed at increasing investment in photosynthetic carbon during the succession process of karst forest plants. This provides a theoretical basis to elucidate the mechanisms of adaptation to drought of plants in the succession process of karst forest communities.
Cite this article
LIAO Su-Hui , NI Long-Kang , QIN Jia-Shuang , TAN Yu , GU Da-Xing . Hydraulic regulation strategies of karst forest species exhibit variation across different successional stages in the mid-subtropical zone[J]. Chinese Journal of Plant Ecology, 2024 , 48(9) : 1223 -1231 . DOI: 10.17521/cjpe.2024.0004
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