Abstract
The drought resistance mechanism of typical mosses in the karst area was studied, and the water and photosynthetic physiological adaptation of mosses to karst environmental change was analyzed in this paper, which provided the basis for the restoration and control of karst rocky desertification ecological environment. Three superior plants in the rocky desertification area of Guizhou province were selected; they are, respectively, Erythrodontium julaceum (Schwaegr.) Par., Barbula unguiculata Hedw., and Bryum argenteum Hedw. Results show that the three kinds of plant rock mosses of leaf water potential (Ψs), free water content ( V a ), total water content, and relative water content (RWC) decreased; bound water ( V s ), water saturation deficit (WSD), and V s / V a ratio increased; transpiration rate (Tr) fell slightly, under drought stress. The physiological indexes of water have different degrees of recovery after rehydration. The total chlorophyll content shows a trend of first increasing followed by falling and then rising. RWC was negatively related to qN and positively related to F v / F m , yield, ETR, and qP. After rewetting, the fluorescence parameters are returned to average level under mild-to-moderate stress. At the same time, it is hard to get back to the control level under severe pressure. The water use efficiency (WUE) decreased with stress and recovered to different degrees after rehydration.
Highlights
Biological crusts are complex complexes formed by cementation of cryptogam plants, soil microorganisms, and surface soil particles.e crust is an essential component of the ecological system in arid and semiarid regions. e karst plateau area in south China is located in the subtropical monsoon humid climate zone
Variable water plants reduce the rate of water loss using tissue moisture content reduction
Variable water plants are at the cost of tissue water content declining [32]
Summary
Biological crusts are complex complexes formed by cementation of cryptogam plants (such as algae, lichens, and bryophytes), soil microorganisms, and surface soil particles.e crust is an essential component of the ecological system in arid and semiarid regions. e karst plateau area in south China is located in the subtropical monsoon humid climate zone. Biological crusts are complex complexes formed by cementation of cryptogam plants (such as algae, lichens, and bryophytes), soil microorganisms, and surface soil particles. E karst plateau area in south China is located in the subtropical monsoon humid climate zone. In this area, the soil layer is shallow, the bedrock is exposed, the infiltration coefficient of atmospheric precipitation is large, and the leakage is serious. Changes in leaf transpiration and photosynthetic rates may be a physiological adaptation mechanism of bryophytes to harsh karst conditions, but there is little literature in the area. In contrast to corresponding vascular plant, water potential of drought-tolerant moss is much lower. In contrast to corresponding vascular plant, water potential of drought-tolerant moss is much lower. e obvious water potential gradient established between plants
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