The response of stocks of C, N, and P to plant invasion in the coastal wetlands of China
The response of stocks of C, N, and P to plant invasion in the coastal wetlands of China
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DOI：
10.1111/gcb.14491
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发表时间：
2018-11
影响因子：
11.6
通讯作者：
Weiqi Wang;J. Sardans;Chun Wang;C. Zeng;C. Tong;Guixiang Chen;Jiafang Huang;Haoran Pan
中科院分区：
文献类型：
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作者：
Weiqi Wang;J. Sardans;Chun Wang;C. Zeng;C. Tong;Guixiang Chen;Jiafang Huang;Haoran Pan
入侵植物物种在湿地地区的日益成功可能会威胁到它们储存碳，氮和磷（C，N和P）的能力。本文研究了中国东南沿海8个不同湿地区域土壤有机碳（SOC）储量与植物-土壤系统中总C、N和P库之间的关系。在这些湿地中，入侵的高草互花米草（Spartina alterniflora）取代了原生高草芦苇（Phragmites australis）和原本由原生物种秋茄（Kandelia obovata）和白骨壤（Avicennia marina）主导的红树林群落。互花米草取代芦苇的入侵成功对土壤性状、生物量积累和植物-土壤碳氮储量没有明显影响。然而，由此产生的更高的能力，以存储在土壤和站立的植物生物量（约超过70和15公斤P公顷，分别）在入侵比在本地高草社区表明生态系统的N：P比下降的可能性与未来的后果，地下和地上的营养链。研究结果还表明，互花米草替代本地红树林的未来发展可能构成严重的环境问题。这包括土壤中沙子的富集，随之而来的是养分保持能力的损失，以及植物-土壤系统中C（土壤和林分生物量分别为2.6和2.2 t C ha-1），N和P的库存急剧下降。这应该与水质恶化有关，因为它加剧了潜在的富营养化过程。此外，碳和养分的损失降低了系统的潜在整体肥力，严重阻碍了未来木本红树林群落的重建。
The increasing success of invasive plant species in wetland areas can threaten their capacity to store carbon, nitrogen, and phosphorus (C, N, and P). Here, we have investigated the relationships between the different stocks of soil organic carbon (SOC), and total C, N, and P pools in the plant–soil system from eight different wetland areas across the South‐East coast of China, where the invasive tallgrass Spartina alterniflora has replaced the native tall grasses Phragmites australis and the mangrove communities, originally dominated by the native species Kandelia obovata and Avicennia marina. The invasive success of Spartina alterniflora replacing Phragmites australis did not greatly influence soil traits, biomass accumulation or plant–soil C and N storing capacity. However, the resulting higher ability to store P in both soil and standing plant biomass (approximately more than 70 and 15 kg P by ha, respectively) in the invasive than in the native tall grass communities suggesting the possibility of a decrease in the ecosystem N:P ratio with future consequences to below‐ and aboveground trophic chains. The results also showed that a future advance in the native mangrove replacement by Spartina alterniflora could constitute a serious environmental problem. This includes enrichment of sand in the soil, with the consequent loss of nutrient retention capacity, as well as a sharp decrease in the stocks of C (2.6 and 2.2 t C ha‐1 in soil and stand biomass, respectively), N, and P in the plant–soil system. This should be associated with a worsening of the water quality by aggravating potential eutrophication processes. Moreover, the loss of carbon and nutrient decreases the potential overall fertility of the system, strongly hampering the reestablishment of woody mangrove communities in the future.