Sha Meng-Qiao, Chai Na, Zhao Hong-Tao, Liu Chun-Jing, Ding Wen-Chao, Xie Wen-Xia
College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2021 Nov 8;42(11):5414-5423. doi: 10.13227/j.hjkx.202103203.
To investigate the effects of invasion on soil phosphorus(P) cycling in coastal wetlands, we selected a zone(SA zone) and mudflat zone(MF zone) in the Jiaozhou Bay as the target areas for the study. The variability of total phosphorus(TP), inorganic phosphorus(IP), and their component contents in wetland soils after invasion and their influencing factors was evaluated. The results showed that the average contents of TP(472.70 mg·kg) and IP(239.00 mg·kg) in the soils were significantly higher than those of TP(386.19 mg·kg) and IP(212.68 mg·kg) in the pre-invasion area, with an increase of 22.40% and 12.38%, respectively. The IP fractions in the study area were dominated by calcium-phosphorus(Ca-P) and iron-phosphorus(Fe-P), accounting for 45%-61% and 31%-49% of IP, respectively. The Ca-P content of the soil in the 10-30 cm layer decreased significantly(<0.05) after invasion, which was especially significant in July. The Fe-P content increased significantly(<0.05); in the 0-40 cm soil layer, Fe-P was higher than that in the 40-60 cm layer(<0.05), and showed significant enrichment in the 10-40 cm soil in July. The structural equation model showed that organic matter(OM) had a significant positive effect on TP and Fe-P after invasion(<0.01), and the normalized path coefficients were 0.775 and 0.724, respectively. Fe-P had a significant negative effect on Ca-P after invasion(<0.01) with a normalised throughput coefficient of -0.435. The study found that invasion generally increased wetland soil P content, while promoting the conversion of Ca-P to Fe-P, improving wetland P bioavailability.
为研究入侵对滨海湿地土壤磷（P）循环的影响，我们选取胶州湾的一个区域（SA区）和泥滩区（MF区）作为研究的目标区域。评估了入侵后湿地土壤中总磷（TP）、无机磷（IP）及其组分含量的变化及其影响因素。结果表明，土壤中TP（472.70 mg·kg）和IP（239.00 mg·kg）的平均含量显著高于入侵前区域的TP（386.19 mg·kg）和IP（212.68 mg·kg），分别增加了22.40%和12.38%。研究区域内的IP组分以钙磷（Ca-P）和铁磷（Fe-P）为主，分别占IP的45%-61%和31%-49%。入侵后10-30 cm土层土壤的Ca-P含量显著降低（<0.05），7月尤为显著。Fe-P含量显著增加（<0.05）；在0-40 cm土层中，Fe-P高于40-60 cm土层（<0.05），且在7月10-40 cm土层中表现出显著富集。结构方程模型表明，入侵后有机质（OM）对TP和Fe-P有显著正向影响（<0.01），标准化路径系数分别为0.775和0.724。入侵后Fe-P对Ca-P有显著负向影响（<0.01），标准化通径系数为-0.435。研究发现，入侵总体上增加了湿地土壤P含量，同时促进了Ca-P向Fe-P的转化，提高了湿地P的生物有效性。
