浙北山区小流域植被类型对土壤无机氮的影响

doi:10.7525/j.issn.1673-5102.2016.02.017

摘要/Abstract

摘要： 通过比较浙北安吉赋石水库集水区6种不同植被类型0~20和20~40 cm土壤无机氮（Inorg-N）含量在植物非生长季和生长季的变化，初步揭示了滨岸带不同植被类型对土壤Inorg-N分布的影响。结果表明，天加山和日回山小流域内不同类型植被土壤硝态氮（NO^-₃-N）和铵态氮（NH⁺₄-N）差异显著（P＜0.05），在植物非生长季，各植被类型土壤NO^-₃-N和NH⁺₄-N的最大差值为10.09和11.45 mg·kg^-1，大于植物生长季的9.6和2.72 mg·kg^-1，这表明其波动程度更剧烈。研究区植被0～20和20～40 cm土壤有机氮（Org-N）占全氮（TN）的比例均达到97.0%以上；相关性分析表明，6种植被表层土壤NO^-₃-N和NH⁺₄-N含量与土壤本身的理化性质密切相关。在对水库总氮输入的贡献上，植物非生长季大于植物生长季，其中日回山流域显著高于天加山流域，2个季节中，日回山流域总氮的输入贡献分别是天加山流域的1.49和1.55倍。植物非生长季，是该区域土壤氮流失风险较大的时期，同时也是氮治理的关键时期，水杉（Metasequoia glyptostroboides）纯林和稗子（Echinochloa crusgalli(L.) Beauv.）2种植被对入库氮素的截留能力较大，适宜大规模营造以保护水库水质。

关键词: 赋石水库, 集水区, 植被类型, 土壤无机氮, 分布特征

Abstract: We studied the contents of inorganic nitrogen in surface and subsurface soil within six different vegetation types at Fushi Reservoir watershed in Anji County of northern Zhejiang Province, and the influence of different vegetation types on soil inorganic nitrogen distribution. There is significant difference(P＜0.05) between the contents of soil NO^-₃-N and NH⁺₄-N at Tianjia mountain and Rihui mountain watershed, and the maximum differences of soil NO^-₃-N and NH⁺₄-N are 10.09 and 11.45 mg·kg^-1 in plant non-growing season with more drastic fluctuations when compared to the plant growing season(9.6 and 2.72 mg·kg^-1). Soil organic nitrogen accounts for more than 97.0% of the total nitrogen at six vegetation types in two seasons. By the correlation analysis, there is a close relationship between NO^-₃-N and NH⁺₄-N of 0-20 cm soil with the physical and chemical properties of soil itself for six vegetation types. The total nitrogen input to reservoir in the plant nongrowing season is higher than that in the growing season, and that of Rihui mountain watershed is significantly greater than that of Tianjia mountain watershed, 1.49 times and 1.55 times more than that of Tianjia mountain watershed in two plant seasons, respectively. The plant non-growing season shows a greater risk of nitrogen loss in this region, and it is also the key stage for the nitrogen pollution control, Metasequoia glyptostroboides forest and Echinochloa crusgalli(L.) Beauv show a larger capacity for storing and retaining nitrogen, which are suitable for large-scale construction to protect the water quality of Fushi Reservoir watershed.

Key words: Fushi Reservoir, watershed, vegetation types, soil inorganic nitrogen, distribution characteristics

汪庆兵1；吴灏1；张建锋1*；陈光才1；李泽波1；王丽1,2；杨泉泉1. 浙北山区小流域植被类型对土壤无机氮的影响[J]. 植物研究, 2016, 36(2): 274-282.

WANG Qing-Bing1；WU Hao1；ZHANG Jian-Feng1*；CHEN Guang-Cai1；LI Ze-Bo1；WANG Li1,2；YANG Quan-Quan1. Influence of Different Vegetation Types on the Soil Inorganic Nitrogen at Small Watershed in Northern Zhejiang Province[J]. Bulletin of Botanical Research, 2016, 36(2): 274-282.

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