High Capacity of Nutrient Accumulation by Invasive Solidago canadensis in a Coastal Grassland

High Capacity of Nutrient Accumulation by Invasive Solidago canadensis in a Coastal Grassland
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沿海草原入侵加拿大一枝黄花的高养分积累能力

DOI:
10.3389/fpls.2019.00575
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发表时间:
2019-05
影响因子:
5.6
通讯作者:
Yu Fei-hai
Yu Fei-hai
中科院分区:
生物学2区
文献类型:
--
作者:
Ye Xiao-Qi;Yan Ya-Nan;Wu Ming;Yu Fei-hai

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背景 加拿大一枝黄花是一种来自北美的臭名昭著的入侵物种,目前正在中国东部地区蔓延。它正在入侵一些沿海草原并取代本地草种。加拿大S. canadensis 入侵对草原土壤养分循环的影响仍不清楚。本研究探讨了加拿大S. canadensis 的入侵对物种地上部分和土壤中常量养分积累的影响。方法比较加拿大烟草入侵地块与以三种不同本土草种(锹草、芦苇为主)的未入侵地块的地上生物量、生物量中的大量养分(氮、磷、钾)库、凋落物质量和分解率、土壤大量养分有效性以及与养分转化相关的土壤微生物量和酶活性。 澳大利亚和白茅。结果加拿大S. canadensis 具有较高的地上生物量,较高的叶片N、P 和K 浓度,因此,立地生物量中的常量营养元素库规模较大。 S. canadensis 还产生更多的凋落物,具有更高的 N、P 和 K 浓度以及更快的分解速度。加拿大S. canadensis 的入侵并没有改变表土(0-10 cm)中氮、磷和钾的总浓度,但入侵确实增加了它们的有效性。加拿大槐的入侵并没有增加土壤总有机质(TSOM)含量,但增加了土壤微生物量以及表土中脲酶、碱性磷酸酶、蔗糖酶、淀粉酶和葡萄糖苷酶的活性。结论 加拿大S. canadensis 的入侵通过增加地上生产力和直立生物量中的养分积累、更快地从凋落物中释放养分以及提高土壤微生物活性来加速常量养分循环速率。养分循环率的提高可能会通过对土壤过程的正反馈进一步增强其入侵性。
Background Solidago canadensis is a notorious invasive species from North America that is spreading across East China. It is invading some coastal grasslands and replacing native grass species. The effects of the S. canadensis invasion on soil nutrient cycling in the grasslands remain unclear. This study examined the effects of the invasion of S. canadensis on macronutrient accumulation in species aboveground part and soil. Methods Aboveground biomass, macronutrient (N, P, and K) pools in biomass, litter mass and decomposition rates, soil macronutrient availability and soil microbial biomass and enzyme activity that were related to nutrient transformation were compared between plots invaded by S. canadensis and uninvaded plots dominated by three different native grass species: Phacelurus latifolius, Phragmites australis, and Imperata cylindrica. Results S. canadensis had higher aboveground biomass, higher leaf N, P, and K concentrations, and consequently, a larger macronutrient pool size in the standing biomass. S. canadensis also produced more litter with higher N, P, and K concentrations and faster decomposition rates. The S. canadensis invasion did not change the total N, P, and K concentration in the topsoil (0–10 cm), but the invasion did increase their availability. The S. canadensis invasion did not increase the total soil organic matter (TSOM) content but did increase the soil microbial biomass and the activities of urease, alkaline phosphatase, invertase, amylase, and glucosidase in the topsoil. Conclusion The invasion of S. canadensis accelerates the macronutrient cycling rate via increases in aboveground productivity and nutrient accumulation in standing biomass, faster nutrient release from litter and higher soil microbial activity. An enhanced nutrient cycling rate may further enhance its invasiveness through a positive feedback on soil processes.
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