亚热带森林不同植被类型土壤磷素形态特征及其驱动因素
[Characteristics of soil phosphorus fractions of different vegetation types in subtropical forests and their driving factors.].
作者信息
Zeng Xiao Min, Fan Yue Xin, Lin Kai Miao, Yuan Ping, Zhao Pan Pan, Chen Yi Ran, Xu Jian Guo, Chen Yueh Min
机构信息
School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China.
出版信息
Ying Yong Sheng Tai Xue Bao. 2018 Jul;29(7):2156-2162. doi: 10.13287/j.1001-9332.201807.019.
Soil P fraction, microbial biomass P (MBP), and activities of acid phosphomonoesterase (ACP) and phosphodiesterase (PD) were analyzed under evergreen broad-leaved forest, mixed forest and coniferous forest in Daiyun Mountains. The results showed that labile-P comprised only 1.0%-4.5% of soil total phosphorus (TP). The ratio of soil carbon to organic phosphorus (C:Po) was >200, indicating phosphorus limitation across the three vegetation types. Organic phosphorus (Po) was a significant fraction of soil P, which accounted for 44.8%-47.1% and 28.6%-30.6% of TP in A and B horizons, respectively. Results from the redundancy analysis showed that the changes in P fractions were mainly driven by PD in the A horizon and by ACP in the B horizon. Moreover, the activities of PD and ACP had a significant negative correlation with Po. The results suggested that phosphorus deficiency occurred in the three vegetation types, and that PD and ACP could play major roles in the depletion of soil Po in response to phosphorus limitation in subtropical forests.
对戴云山常绿阔叶林、混交林和针叶林下的土壤磷组分、微生物生物量磷（MBP）以及酸性磷酸单酯酶（ACP）和磷酸二酯酶（PD）的活性进行了分析。结果表明，活性磷仅占土壤总磷（TP）的1.0%-4.5%。土壤碳与有机磷的比值（C:Po）>200，表明这三种植被类型均存在磷限制。有机磷（Po）是土壤磷的重要组成部分，在A层和B层中分别占TP的44.8%-47.1%和28.6%-30.6%。冗余分析结果表明，A层中磷组分的变化主要由PD驱动，B层中则由ACP驱动。此外，PD和ACP的活性与Po呈显著负相关。结果表明，这三种植被类型均存在缺磷现象，并且在亚热带森林中，PD和ACP在响应磷限制时可能在土壤Po的消耗中起主要作用。
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