四川农业大学学报 ›› 2018, Vol. 36 ›› Issue (06): 758-764.doi: 10.16036/j.issn.1000-2650.2018.06.007

• • 上一篇    下一篇

温度和水分对华西雨屏区毛竹林土壤氮矿化的影响

桂慧颖1, 2, 李雪江3, 王景燕1, 2, 龚伟1, *, 黄帅1, 唐海龙1, 周于波1   

  1. 1. 四川农业大学林学院/林业生态工程四川省重点实验室,成都 611130;
    2. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008;
    3. 剑阁县翠云廊古柏自然保护区管理局,四川 广元 628317
  • 收稿日期:2018-07-10 出版日期:2018-12-28 发布日期:2021-03-01
  • 通讯作者: 龚伟, 博士, 教授, 主要从事经济林培育与土壤生态研究研究, E-mail:gongwei@sicau.edu.cn。
  • 作者简介:桂慧颖,硕士研究生。
  • 基金资助:
    国家自然科学基金项目(41201296);土壤与农业可持续发展国家重点实验室开放课题(Y412201424)。

Effects of Temperature and Moisture on Soil Nitrogen Mineralization of Phyllostachys heterocycla Plantation in the Rainy Area of Western China

GUI Huiying1, 2, LI Xuejiang3, WANG Jingyan1, 2, GONG Wei1, *, HUANG Shuai1, TANG Hailong1, ZHOU Yubo1   

  1. 1. College of Forestry, Sichuan Agricultural University/Sichuan Provincial Key Laboratory of Ecological Forestry Engineering, Chengdu 611130, China;
    2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
    3. Nature Reserve Bureau of Jiange Cuiyunlang Old Cypress in Sichuan, Guangyuan 628317, Sichuan, China
  • Received:2018-07-10 Online:2018-12-28 Published:2021-03-01

摘要: 【目的】探究毛竹林土壤在不同温度和水分处理条件下的氮矿化特征及氮矿化与温度和水分的关系。【方法】采用全因子试验设计,设置4个温度水平(5、15、25和35 ℃)和4个田间持水量(20%、40%、60%和80% FWC)共16组处理,于培养箱中培养30 d后测定各项指标。【结果】在各温度处理条件下,净氨化速率、净硝化速率和氮净矿化速率均随土壤含水量的增加而增加,高于60% FWC后随含水量增加而降低;在5~25 ℃温度范围内,净氨化速率、净硝化速率和氮净矿化速率随温度的升高而增加,高于25 ℃后呈降低趋势。最有利于毛竹林土壤氮净矿化作用的温度条件为26.2 ℃,含水量条件为60.0% FWC。土壤净氨化速率、净硝化速率和氮净矿化速率的Q10值为0.857~1.904,15 ℃/5 ℃的Q10值显著高于25 ℃/15 ℃和35 ℃/25 ℃的Q10值,毛竹林土壤氮矿化在5~15 ℃范围内最敏感。各处理土壤净硝化速率占氮矿化速率的43.9%~49.1%。【结论】温度和水分变化显著影响毛竹林土壤氮矿化;毛竹林土壤氮矿化过程中形成的硝态氮比例较高,易在该区多雨条件下被淋失或在厌氧条件下被反硝化。

关键词: 温度, 水分, 毛竹林, 氮矿化, Q10

Abstract: 【Objective】 The purpose of this study was to investigate soil nitrogen mineralization of P. heterocycla plantation under different temperature and moisture conditions and to examine relationships between nitrogen mineralization and temperature and moisture.【Method】 A full-factor experimental design (16 groups), including 4 temperature levels (5, 15, 25 and 35 ℃) and 4 field capacity (20%, 40%, 60% and 80% FWC), was used in this study. All indexes were measured after 30 days of incubation. 【Result】 Under each condition of temperature, net ammonification, nitrification and mineralization rates generally increased with increasing soil moisture, but decreased after 60% FWC. Soil net ammonification , nitrification and mineralization rates increased from 5 ℃ to 25 ℃, but decreased after 25 ℃. The optimal temperature of soil net mineralization of P. heterocycla plantation was 26.2 ℃, and the optimal moisture was 60.0% FWC. The Q10 value of soil net ammonification, nitrification and mineralization rates was ranged from 0.857 to 1.904, and the Q10 values at 15 ℃ or 5 ℃ were remarkably higher than those at 35 ℃ or 25 ℃. The nitrogen mineralization of P. heterocycla plantation was sensitive in the range of 5~15 ℃. The net nitrification accounted for 43.9% ~ 49.1% of nitrogen mineralization. 【Conclusion】 Temperature and moisture significantly affected soil net nitrogen mineralization of P. heterocycla plantation. Nitrate nitrogen was the main inorganic nitrogen form during mineralization process, implying that it could be leached and denitrified in this specific area.

Key words: temperature, moisture, Phyllostachys heterocycla plantation, soil N mineralization, Q10

中图分类号: 

  • S158.5