Bryophyte physiological responses to, and recovery from, long-term nitrogen deposition and phosphorus fertilisation in acidic grassland
Bryophyte physiological responses to, and recovery from, long-term nitrogen deposition and phosphorus fertilisation in acidic grassland
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DOI：
10.1111/j.1469-8137.2008.02617.x
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发表时间：
2008-01-01
期刊：
影响因子：
9.4
通讯作者：
Phoenix, Gareth K.
中科院分区：
文献类型：
--
作者：
Arroniz-Crespo, Maria;Leake, Jonathan R.;Phoenix, Gareth K.
大气氮沉降可导致硼镁石丰度的大幅下降，但这种下降的生理基础尚未完全了解。苔藓植物的生理反应也可能是反映氮沉降影响和氮沉降恢复的敏感生物指标。（氮（N）、磷（P）和钾（K）：氮磷代谢酶（硝酸还原酶和磷酸单酯酶），光合色素，叶绿素荧光，两种常见苔藓植物的硬叶和覆盖率（Pseudoscleropodium purum和Rhytidiadelphus squarrosus）到长期（11年）增加的N沉降（+3.5和+14 g N m（-2）yr（-1））与P的因子组合。在处理停止后22个月，恢复的反应也进行了评估。增加氮沉降造成高达90%的损失brituite覆盖，但没有恢复观察。磷酸单酯酶活性和组织N：P比增加了三倍，响应于N负荷，并显示出明显的恢复，特别是在P. purum。较小的响应和恢复也被视为在所有叶绿素荧光测量和改变光合色素composition.The生长的P限制似乎是一个关键的机制驱动bratite损失沿着损害光系统II。作为氮沉积影响的生物指标，特别是恢复的生物指标，生理测量比丰度测量更敏感。New Phytologist（2008）180：864-874（c）The Authors（2008）。Journal compilation（c）New Phytologist（2008）doi：10.1111/j.1469-8137.2008.02617.x.
Atmospheric nitrogen deposition can cause major declines in bryophyte abundance yet the physiological basis for such declines is not fully understood. Bryophyte physiological responses may also be sensitive bioindicators of both the impacts of, and recovery from, N deposition.Here, responses of tissue nutrients (nitrogen (N), phosphorus (P) and potassium (K): NPK), N and P metabolism enzymes (nitrate reductase and phosphomonoesterase), photosynthetic pigments, chlorophyll fluorescence, sclerophylly and percentage cover of two common bryophytes (Pseudoscleropodium purum and Rhytidiadelphus squarrosus) to long-term (11 yr) enhanced N deposition (+3.5 and +14 g N m(-2) yr(-1)) are reported in factorial combination with P addition. Recovery of responses 22 months after treatment cessation were also assessed.Enhanced N deposition caused up to 90% loss of bryophyte cover but no recovery was observed. Phosphomonoesterase activity and tissue N : P ratios increased up to threefold in response to N loading and showed clear recovery, particularly in P. purum. Smaller responses and recovery were also seen in all chlorophyll fluorescence measurements and altered photosynthetic pigment composition.The P limitation of growth appears to be a key mechanism driving bryophyte loss along with damage to photosystem II. Physiological measurements are more sensitive than measurements of abundance as bioindicators of N deposition impact and of recovery in particular.New Phytologist (2008) 180: 864-874(c) The Authors (2008). Journal compilation (c) New Phytologist (2008) doi: 10.1111/j.1469-8137.2008.02617.x.