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Mistletoe litter accelerates the decomposition of recalcitrant host litter in a semi‐arid savanna, south‐west Zimbabwe
Austral Ecology ( IF 1.5 ) Pub Date : 2020-07-28 , DOI: 10.1111/aec.12935 Hilton G. T. Ndagurwa 1, 2 , Tsitsi S. Maponga 1, 3 , Justice Muvengwi 1, 4
Austral Ecology ( IF 1.5 ) Pub Date : 2020-07-28 , DOI: 10.1111/aec.12935 Hilton G. T. Ndagurwa 1, 2 , Tsitsi S. Maponga 1, 3 , Justice Muvengwi 1, 4
Affiliation
Litter mixing plays an important role in enhancing carbon and nutrient cycling, but little is known about the effects of nutrient‐rich mistletoe litter on the decomposition of slow‐decaying litter in nutrient‐poor environments. We investigated the effects of mistletoe litter on the decomposition and nutrient release of host Vachellia karroo litter in semi‐arid savanna, south‐west Zimbabwe. Mass loss and nutrient release was quantified in litter of each single species, two‐species, three‐species and four‐species mixtures of mistletoe, Erianthemum ngamicum, Plicosepalus kalachariensis and Viscum verrucosum, and the host V. karroo in 30 × 30 cm nylon‐mesh litterbags under field conditions at 2‐month intervals for one year. Repeated‐measures analysis of variance was used to test the effects of litter type, incubation time and their interaction on mass loss and nutrient release. The effects of initial litter quality, incubation time and litter mixture on decomposition rate were also tested. Litter mixtures of mistletoes and V. karroo decomposed three times faster than V. karroo decomposing alone, and decomposition of litter mixtures was influenced by initial litter quality and incubation time. Further, non‐additive effects are reported, with synergistic interactions being greater after 12 months and common regarding mass loss, phosphorus and carbon, whereas antagonistic interactions were common in nitrogen release. These effects varied both in magnitude and direction between litter‐mixing treatments and with incubation time (P < 0.05). Our findings show that mistletoe litter enhance the decomposition of recalcitrant host litter consistent with findings in other ecosystems that contain hemiparasites, suggesting that hemiparasite litter plays an important role in carbon and nutrient flux in this system. Further, by enhancing the decomposition and nutrient release rate of recalcitrant host litter, mistletoes increase nutrient availability to other organisms within the ecosystem lending support to the premise that parasitic plants function as keystone species in environments where they occur.
中文翻译:
槲寄生凋落物加速津巴布韦西南半干旱大草原的顽强宿主凋落物的分解
凋落物的混合在促进碳和养分循环方面起着重要作用,但是对于营养贫乏的环境中富营养的槲寄生凋落物对衰变缓慢的凋落物分解的影响知之甚少。我们研究了槲寄生凋落物对津巴布韦西南半干旱热带稀树草原寄主Vachellia karroo凋落物分解和养分释放的影响。质量损失和养分释放在每个单一物种,槲寄生,Erianthemum ngamicum,Plicosepalus kalachariensis和Viscum verrucosum以及寄主V.karroo的两个物种,两个物种,三个物种和四个物种的混合物中进行定量在30×30厘米的尼龙网垃圾袋中,在野外条件下,每2个月间隔一年。重复测量方差分析用于检验垫料类型,孵化时间及其相互作用对质量损失和养分释放的影响。还测试了初始垫料质量,孵化时间和垫料混合物对分解速率的影响。槲寄生和V. karroo的垃圾混合物分解速度比V. karroo快三倍单独分解,混合料的分解受初始混合料质量和孵化时间的影响。此外,据报道非加性作用,协同相互作用在12个月后更大,并且在质量损失,磷和碳方面很常见,而拮抗性在氮释放中很常见。这些效果在混合处理和孵化时间之间的大小和方向都不同(P <0.05)。我们的发现表明,槲寄生凋落物增强了顽calc性宿主凋落物的分解,这与包含半寄生虫的其他生态系统中的发现一致,这表明半寄生虫凋落物在该系统中的碳和养分通量中起着重要作用。此外,通过增强顽it宿主凋落物的分解和养分释放速率,槲寄生增加了生态系统内其他生物的养分利用率,从而支持了寄生植物在其生活环境中起关键作用的前提。
更新日期:2020-07-28
中文翻译:
槲寄生凋落物加速津巴布韦西南半干旱大草原的顽强宿主凋落物的分解
凋落物的混合在促进碳和养分循环方面起着重要作用,但是对于营养贫乏的环境中富营养的槲寄生凋落物对衰变缓慢的凋落物分解的影响知之甚少。我们研究了槲寄生凋落物对津巴布韦西南半干旱热带稀树草原寄主Vachellia karroo凋落物分解和养分释放的影响。质量损失和养分释放在每个单一物种,槲寄生,Erianthemum ngamicum,Plicosepalus kalachariensis和Viscum verrucosum以及寄主V.karroo的两个物种,两个物种,三个物种和四个物种的混合物中进行定量在30×30厘米的尼龙网垃圾袋中,在野外条件下,每2个月间隔一年。重复测量方差分析用于检验垫料类型,孵化时间及其相互作用对质量损失和养分释放的影响。还测试了初始垫料质量,孵化时间和垫料混合物对分解速率的影响。槲寄生和V. karroo的垃圾混合物分解速度比V. karroo快三倍单独分解,混合料的分解受初始混合料质量和孵化时间的影响。此外,据报道非加性作用,协同相互作用在12个月后更大,并且在质量损失,磷和碳方面很常见,而拮抗性在氮释放中很常见。这些效果在混合处理和孵化时间之间的大小和方向都不同(P <0.05)。我们的发现表明,槲寄生凋落物增强了顽calc性宿主凋落物的分解,这与包含半寄生虫的其他生态系统中的发现一致,这表明半寄生虫凋落物在该系统中的碳和养分通量中起着重要作用。此外,通过增强顽it宿主凋落物的分解和养分释放速率,槲寄生增加了生态系统内其他生物的养分利用率,从而支持了寄生植物在其生活环境中起关键作用的前提。