生态学报2024，Vol.44Issue(5)：2081-2088,8.DOI:10.20103/j.stxb.202304160775
斑块面积对干燥-复水条件下藓类植物生理活性的影响
Effects of patch sizes of moss dominated biocrusts on the physiological activity of mosses under repeated de-rehydration conditions
摘要
Abstract
Disturbance usually causes fragmentation and degradation of biological soil crusts(biocrusts).To clarify the mechanism of biocrust degradation caused by disturbance-induced fragmentation,we selected the moss(Didymodon vinealis)dominated biocrusts(moss crusts hereafter)from the hilly-gully region of the Loess Plateau as the object of study.The dehydration rates and contents of osmoregulatory substances,malondialdehyde and photosynthetic pigment in the individual mosses and mosses of the moss crust patches with different sizes,which measured in the diameters of 1 cm,2 cm,3 cm,4 cm,and 5 cm,were measured under 25 rounds repeated de-rehydration conditions,so as to reveal the biological mechanism of biocrusts degradation after disturbance.The results showed that(1)the dehydration rate of mosses increased with the decrease of patch sizes of moss crusts.The dehydration rate of mosses in the patch with diameter of 1 cm was twice of that with diameter of 5 cm.(2)The contents of soluble sugars,soluble proteins,and chlorophyll of mosses in the patches with diameter less than 5 cm were lower than those with diameter of 5 cm patches,and the content of malondialdehyde had no significant change with different moss crust patches sizes after 25 days of repeated de-rehydration.(3)Dehydration rate of mosses was extremely significantly negatively correlated to sizes of moss crust patches,the contents of soluble sugars,soluble proteins,and chlorophyll.The results of the study showed that the sizes of moss crust patches affected the dehydration rate of mosses in the patches and then affected their osmotic regulation and photosynthetic capacity.The dehydration rate of mosses increased as the size of moss crust patches decreased,which damaged to physiological activities of mosses and might be the cause of degeneration induced by fragmentation of moss crust patches.This study explains the physiological causes of mosses degradation after disturbance from the perspective of mosses physiology,which provides scientific basis for the protection and management of biocrusts.关键词
藓结皮/斑块面积/干燥速率/光合色素/渗透调节Key words
moss crust/patch size/dehydration rate/photosynthetic pigments/osmotic adjustment引用本文复制引用
乔羽,赵允格,高丽倩,井海梦,张珺雨..斑块面积对干燥-复水条件下藓类植物生理活性的影响[J].生态学报,2024,44(5):2081-2088,8.基金项目
国家重点研发计划课题项目(2022YFF1300802) （2022YFF1300802）
国家自然科学基金项目(41830758) （41830758）
中央高校基本科研业务费专项资金项目(2452020237) （2452020237）
