沙埋干扰去除后生物土壤结皮光合生理恢复机制

摘要/Abstract

摘要： 通过对沙埋干扰解除后腾格里沙漠人工植被区4种典型生物土壤结皮光合作用、暗呼吸作用与叶绿素荧光参数的跟踪测定,研究了沙埋干扰解除后生物土壤结皮光合生理恢复机制。结果表明,沙埋干扰解除后4种生物土壤结皮净光合速率增加,暗呼吸速率先降低后增加。沙埋干扰去除后净光合速率、暗呼吸速率受沙埋深度和沙埋时施水量的影响,分别与沙埋深度和施水量呈反比和正比关系。沙埋干扰解除后4种生物土壤结皮PSⅡ光化学效率随时间逐渐增加,证实了生物土壤结皮沙埋干扰解除后积极自行修复的内在生理机制。

关键词: 沙埋, 生物土壤结皮, 光合作用, 呼吸作用, 叶绿素荧光

Abstract: Based on continuous measurements of photosynthesis, dark respiration and chlorophyll fluorescence after the removal of sand burial disturbance, we studied the mechanism of photosynthetic recovery of four typical biological soil crusts in an artificially revegetated area in the southeastern fringe of the Tengger Desert. The results exhibited a continuous increase in net photosynthetic rates and an initial decrease and later increase of dark respiratory rates of each of the four types of crusts with time lapsing after the removal of sand burial disturbance. A significant positive effect of water supply and a negative effect of burial depth on net photosynthetic rates and dark respiratory rates were found on the four types of crusts after the removal of sand burial disturbance, respectively. In addition, the progressive accretion of PSII photochemical efficiencies proved the positive mechanism of photosynthetic recovery of four typical biological soil crusts after the removal of sand burial disturbance.

Key words: sand burial, biological soil crusts, photosynthesis, dark respiration, chlorophyll fluorescence

中图分类号:

S154.3

贾荣亮;李新荣;谭会娟;贺郝钰;苏洁琼;刘扬. 沙埋干扰去除后生物土壤结皮光合生理恢复机制[J]. 中国沙漠, 2010, 30(6): 1299-1304.

JIA Rong-liang;LI Xin-rong;TAN Hui-juan;HE Hao-yu;SU Jie-qiong;LIU Yang. Mechanism of Photosynthetic Recovery of Biological Soil Crusts after the Removal of Sand Burial Disturbance[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(6): 1299-1304.

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