The effects of condensed tannins derived from senescing Rhizophora mangle leaves on carbon, nitrogen and phosphorus mineralization in a Distichlis spicata salt marsh soil
The effects of condensed tannins derived from senescing Rhizophora mangle leaves on carbon, nitrogen and phosphorus mineralization in a Distichlis spicata salt marsh soil
复制标题
DOI：
10.1007/s11104-018-3807-2
复制
发表时间：
2018-09
期刊：
影响因子：
4.9
通讯作者：
Qiu-fang Zhang;H. J. Laanbroek
中科院分区：
文献类型：
--
作者：
Qiu-fang Zhang;H. J. Laanbroek
背景和目标由于全球变暖，预计红树林将向北和向南移动并进入盐沼，从而富含来自红树林的有机化合物。人们对红树落叶中大量存在的单宁对盐沼土壤生物地球化学循环的影响知之甚少。方法在微观世界中，来自 Distichlis spicatasalt 盐沼的土壤富含单宁。芒果叶粉 (LP)、粗缩合单宁 (CCT) 和纯化缩合单宁 (PCT)，或市售单宁酸 (TA)。每个处理都接受固定量的单宁，即 10 毫克/克干土。由于各馏分中单宁的富集，碳的添加量从C < TA = PCT < CCT < LP增加。在潜伏期的第 7、21、35 和 42 天，关闭微观世界 24 小时后测定 CO2 排放率。还测定了整个培育期的净氮和磷矿化率。实验在实用盐度单位 20、28 和 35 下进行，以覆盖现场观察到的盐度范围（20 和 35 PSU）。结果在整个培养期内，CO2 排放量按 C < PCT < CCT = TA < LP 微观世界显着增加（p< 0.05）。 LP微观世界表现出矿物氮和磷的固定化，而其他微观世界则显示氮和磷的净矿化，对于N矿化，顺序为CCT < TA < PCT < C，对于P矿化，CCT = TA < C < PCT。盐度为20 PSU 时测得的C 和N 矿化率显着高于28 和35 PSU 时测得的C 和N 矿化率。结论结果表明，红树林凋落物刺激了净C 矿化以及N 和P 固定化。 senescingR 的纯化缩合单宁。 mangleleaves 增强了 C 和 P，并抑制了净 N 矿化。
Background and aimsDue to global warming, it is to be expected that mangroves will move north- and southwards and enter salt marshes, which will then be enriched with mangrove-derived organic compounds. Little is known about the effects that tannins, which are abundantly present in leaf litter ofRhizophora mangle, will have on the biogeochemical cycles in salt marsh soils.MethodsIn microcosms, soil from aDistichlis spicatasalt marsh was enriched withR. mangle-derived leaf powder (LP), crude condensed tannins (CCT) and purified condensed tannins (PCT), or with commercially available tannic acid (TA). Each treatment received a fixed amount of tannins, i.e. 10 mg /g dry soil. Due to the enrichment with tannins in each fraction, the amount of carbon added increased from C < TA = PCT < CCT < LP. At Day 7, 21, 35 and 42 of the incubation period, CO2emission rates were determined after closing the microcosms for 24 h. Net nitrogen and phosphorous mineralization rates were also determined for the entire incubation period. Experiments were done at Practical Salinity Units of 20, 28 and 35 to cover the range in salinities observed in the field (20 and 35 PSU).ResultsFor the whole incubation period, the CO2emission increased significantly (p< 0.05) in the order of C < PCT < CCT = TA < LP microcosms. The microcosms with LP showed immobilization of mineral nitrogen and phosphorus, while the other microcosms revealed net nitrogen and phosphorus mineralization in the order of CCT < TA < PCT < C for N mineralization, and CCT = TA < C < PCT for P mineralization. The C and N mineralization rates measured at a salinity of 20 PSU were significantly larger than at 28 and 35 PSU.ConclusionThe results showed that mangrove leaf litter stimulated net C mineralization and N and P immobilization. Purified condensed tannins of senescingR. mangleleaves enhanced C and P, and suppressed net N mineralization.