干燥对人工生物土壤结皮固氮酶活性恢复过程的影响

发布时间：2018-02-27 08:34

本文关键词： 生物土壤结皮干燥生物固氮固氮酶活性光合活性演替阶段　出处：《中国科学:生命科学》2017年07期 　论文类型：期刊论文

【摘要】：本文研究了不同演替阶段的人工生物土壤结皮其光合和固氮酶活性恢复过程对干燥时长的响应.生物土壤结皮通过人工接种丝状土壤蓝藻诱导形成,并根据藻类和苔藓丰度的不同划分为蓝藻结皮、藻-藓结皮、藓-藻结皮和苔藓结皮等4个演替阶段.经不同时长干燥处理的结皮,复水后测定其光合活性(F_v/F_m)和固氮酶活性(NA)的恢复过程.结果表明,苔藓结皮F_v/F_m的恢复速率与干燥时长呈负相关,但其他演替阶段结皮的F_v/F_m恢复速率几乎不受干燥时长的影响.早期演替阶段的结皮(藻结皮、藻-藓结皮和藓-藻结皮)显示出相同的NA活性恢复模式和不同的NA速率,而苔藓结皮NA活性的恢复较慢.光照条件下,干燥时长不超过8天时,则干燥时间越长,早期演替阶段结皮的NA活性越低,但在此较短的干燥时长范围内,苔藓结皮NA活性的恢复并不受干燥时长的影响;黑暗条件下,不同演替阶段结皮干燥两天后固氮酶活性均较低.相反,较长时间的干燥后(4~6个月),所有结皮均恢复了较高的NA活性.结果表明,不同演替阶段的人工生物土壤结皮其生理活性对干燥有不同的耐受性.
[Abstract]:In this paper, the response of photosynthetic and nitrogenase activity recovery process of artificial biological soil crust in different succession stages to long dry time was studied. The biological soil crust was induced by cyanobacteria in filamentous soil by artificial inoculation. According to the abundance of algae and bryophytes, they were divided into four succession stages: cyanobacteria crust, alga-moss crust, moss-algal crust and mossy crust. The recovery process of photosynthesis activity (FV / FM) and nitrogenase activity (NAA) was determined after rehydration. The results showed that the recovery rate of moss crust Fv / Fm was negatively correlated with the length of dry time. However, the recovery rate of skin in other stages was almost unaffected by the length of dry time. The early succession stage showed the same pattern of na activity recovery and different na rates in the early succession stage (algal crust, algal crust and moss-algal crust). The na activity of bryophyte crusts recovered slowly under light condition. The longer the drying time was, the lower the na activity was in the early succession stage, but the shorter the drying time was, the longer the na activity was, but the longer the drying time was, the lower the na activity was in the early succession stage, but the longer the drying time was, the lower the na activity was in the early succession stage. The recovery of na activity in bryophytes was not affected by the length of drying time, but the activity of nitrogenase was lower in different successional stages after drying for two days. After a long period of drying for 4 ~ 6 months, all the crusts recovered higher na activity. The results showed that the physiological activities of artificial soil crust in different succession stages had different tolerance to drying.
【作者单位】：中国科学院水生生物研究所中国科学院藻类生物学重点实验室;中国科学院大学;
【基金】：林业公益性行业科研专项(批准号:201404204-02)资助
【分类号】：S154

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