Yang Le, He Ying, Li Dong-Bin, Yue Chun-Lei, Zhu Hong, Zhang Fei-Ying, Li He-Peng
Zhejiang Academy of Forestry, Hangzhou 310023, China.
College of Water Conservation and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.
Ying Yong Sheng Tai Xue Bao. 2022 May;33(5):1267-1274. doi: 10.13287/j.1001-9332.202205.029.
Mountain swamps in Zhejiang Province have been suffered from severe drouhgt threats because of climate change and artificial interruption. bogs and swamps were gradually degraded into arid swamps. However, the effects of arid processes on the C, N, P contents of soils and their stoichiometry in mountain swamps are still unclear. We measured C, N and P concentrations, pH values, and bulk density in the upper 0-60 cm soil layers in the stands of five mountain swamps with the different arid levels. Moreover, the aboveground biomass and the C, N, P concentrations in the crushed plant mixture were also measured. The results showed that the soils of mountain swamps in Zhejiang Province were rich in soil organic carbon (SOC), total nitrogen (TN), but infertile in phosphorus (TP). Aboveground biomass, soil pH, bulk density increased, while SOC, TN, TP, C:N, C:P, N:P decreased with aridity. Soil pH and bulk density had significant negative correlations with SOC, TN, and TP in soils, respectively. The differences in the C, N, P accumulation in the soils were probably associated with litterfall production, the oxygen condition of wetlands, and the degree of plant decomposition at the different types of mountain swamps. In all, arid trends were obvious at the mountain swamps in Zhejiang Province. Soil nutrients, such as C, N, P, deceased, while plant community succeeded from the wet swamp to the mesophyte vegetation with the arid processes. The contents of C, N and P in the plants varied across species, and were not coupled with those in the soils.
由于气候变化和人为干扰，浙江省山区沼泽地一直遭受严重干旱威胁。沼泽逐渐退化成为干旱沼泽。然而，干旱过程对山区沼泽土壤碳、氮、磷含量及其化学计量特征的影响仍不清楚。我们测定了五个不同干旱程度的山区沼泽林分中0 - 60厘米土层的碳、氮、磷浓度、pH值和容重。此外，还测定了地上生物量以及粉碎植物混合物中的碳、氮、磷浓度。结果表明，浙江省山区沼泽土壤富含土壤有机碳（SOC）和全氮（TN），但磷（TP）含量贫瘠。随着干旱程度增加，地上生物量、土壤pH值和容重升高，而SOC、TN、TP、C:N、C:P、N:P降低。土壤pH值和容重分别与土壤中的SOC、TN和TP呈显著负相关。不同类型山区沼泽土壤中碳、氮、磷积累的差异可能与凋落物产生、湿地的氧气状况以及植物分解程度有关。总体而言，浙江省山区沼泽干旱趋势明显。随着干旱过程，土壤养分如碳、氮、磷减少，而植物群落从湿沼泽演替为中生植被。植物中碳、氮、磷的含量因物种而异，且与土壤中的含量不相关。
