LIU Qingyi,WANG Lei,SHI Jingpan,et al.Effects of Different Vegetation Types on Soil Nitrogen Fractions and Enzyme Activity in Riparian Zones of Plain Sandy Area[J].Research of Soil and Water Conservation,2023,30(05):85-91.[doi:10.13869/j.cnki.rswc.2023.05.031.]
平原沙土区河岸带不同植被类型对土壤氮组分及酶活性的影响
- Title:
- Effects of Different Vegetation Types on Soil Nitrogen Fractions and Enzyme Activity in Riparian Zones of Plain Sandy Area
- 文章编号:
- 1005-3409(2023)05-0085-07
- 分类号:
- S714.2
- 文献标志码:
- A
- 摘要:
- [目的]明晰河岸带不同植被类型对土壤氮含量及酶活性的影响程度,以期为平原沙土区河岸带的植被构建和土壤养分固持提供依据。[方法]以江苏省平原沙土区丰县复新河河岸带15年生杨树纯林、柳树纯林和杨柳混交林为研究对象,测定5个土层深度(0—20 cm,20—40 cm,40—60 cm,60—80 cm,80—100 cm)的氮组分含量及酶活性,探讨不同植被类型中土壤氮含量和酶活性与土壤环境因子间的关系。[结果](1)各植被类型中,土壤全氮、铵态氮、硝态氮和微生物生物量氮含量均高于对照,60—100 cm深层土壤氮含量在垂直分布上没有表现出明显规律。土壤全氮含量变化范围为0.20～0.75 g/kg,大小顺序为杨树纯林>柳树纯林>杨柳混交林,总体上均随着土层深度的增加而降低,在0—20 cm土层中的含量显著高于其他4个土层。土壤铵态氮和硝态氮含量在杨树纯林中最高,且在杨树纯林中整体上随着土层深度的增加而降低。土壤微生物生物量氮含量在杨柳混交林中最高,在杨树纯林中最低。(2)土壤脲酶、硝酸还原酶、亚硝酸还原酶活性变化范围为0.30～4.35,0.05～0.21,0.46～0.59 mg/(g·d),3种酶活性在杨树纯林中最高,在不同植被类型和土层中存在显著差异(p<0.05)。(3)冗余分析表明土壤有机碳含量、细根生物量和凋落物生物量是影响土壤氮含量和酶活性的主导因子。[结论]试验地杨树纯林由于土壤有机碳含量、细根生物量和凋落物生物量较高导致土壤氮含量和酶活性最高,因此在平原沙土区河岸带选取适宜的植被类型可以提高土壤氮素的固持能力,进而可能会减少土壤养分的流失。
- Abstract:
- [Objective] In purpose of providing a scientific basis for vegetation construction and soil nutrient sequestration in riparian zones in plain sandy area, this study investigated the effects of different vegetation types on soil N content and enzyme activity in riparian zones of Fuxin River in Feng County, Jiangsu Province. [Methods] Three 15-year-old riparian vegetation types, including pure poplar plantation, pure willow plantation and poplar-willow plantation, together with control(CK)were selected, and the nitrogen content and enzyme activity were measured at five soil depths(0—20 cm, 20—40 cm, 40—60 cm, 60—80 cm, and 80—100 cm). [Results](1)In all vegetation types, the total nitrogen contents, ammonia nitrogen contents, nitrate nitrogen contents, microbial biomass nitrogen contents of the four soil layers(except for soil layers≥60 cm)were higher than those of CK. Soil total N contents varied from 0.20 to 0.75 g/kg(with a ranking of pure poplar plantation>pure willow plantation>poplar-willow plantation), and generally decreased with increasing soil layer depth, with a significant higher content in 0—20 cm. Soil ammonium and nitrate nitrogen contents were highest in pure poplar plantation, in which they declined along soil depth. Soil microbial biomass nitrogen content was the highest in poplar-willow plantation and lowest in pure poplar plantation.(2)Soil urease, nitrate reductase and nitrite reductase activities varied between 0.30～4.35, 0.05～0.21 and 0.46～0.59 mg/(g·d), respectively. The activities of the three enzymes were the highest in pure poplar plantation and differed significantly among vegetation types and soil layers(p<0.05).(3)Redundancy analysis showed that soil organic carbon content, fine root biomass and litter biomass were the dominant factors influencing soil N content and enzyme activity. [Conclusion] The highest soil nitrogen content and enzymatic activity were found in the pure poplar plantation, due to the high soil organic carbon content, fine root biomass and litter biomass. This implies that the selection of suitable vegetation types in the riparian zone of the plain sandy area can improve the soil nitrogen sequestration capacity, which in turn may reduce the loss of soil nutrients.
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备注/Memo
收稿日期:2022-06-23 修回日期:2022-07-26
资助项目:江苏省水利科技项目“江苏省平原沙土区生态河道水土保持效果评价及措施优化配置技术研究”(2020054)
第一作者:刘晴廙(1999—),女,贵州瓮安人,硕士研究生,主要研究方向为城市森林生态。E-mail:395273685@qq.com
通信作者:关庆伟(1964—),男(满族),辽宁沈阳人,教授,主要从事森林生态系统结构、功能与过程等研究。E-mail:guanjapan999@163.com