林业科学 ›› 2021, Vol. 57 ›› Issue (4): 24-31.doi: 10.11707/j.1001-7488.20210403
高艳丽,杨智杰*,张丽,熊德成
收稿日期:
2019-10-08
出版日期:
2021-04-25
发布日期:
2021-05-21
通讯作者:
杨智杰
基金资助:
Yanli Gao,Zhijie Yang*,Li Zhang,Decheng Xiong
Received:
2019-10-08
Online:
2021-04-25
Published:
2021-05-21
Contact:
Zhijie Yang
摘要:
目的: 探索亚热带米槠常绿阔叶林转换为人促更新林和人工林后的土壤氮矿化作用的变化,为评价和选择森林经营方式提供参考。方法: 以亚热带米槠常绿阔叶天然林、人促更新常绿阔叶林和米槠人工林为研究对象,比较不同森林类型表层(0~10和10~20 cm)土壤的铵态氮(NH4+-N)和硝态氮(NO3--N)含量,并采用室内氮矿化培养方法测定土壤氮矿化速率,研究不同经营方式对森林土壤氮矿化作用的影响。结果: 天然林转换为人促更新林和人工林后,0~10和10~20 cm土层土壤NH4+-N含量分别下降5%~13%和16%~25%,NO3--N含量分别增加1.4%~241%和68%~871%,且人促更新林NH4+-N含量比人工林高3%~27%,人促更新林NO3--N含量比人工林低40%~65%;天然林转换后,人促更新林和人工林土壤净氮矿化速率分别下降11%~12%和27%~50%,人促更新林土壤净氮矿化速率显著高于人工林,净硝化速率显著低于人工林。结论: 与人工林相比,人促更新营林方式的干扰活动程度低,林地凋落物养分归还量大,同时土壤净氮矿化速率高且硝化速率低,向土壤输入更多的有效性氮源。因此,人促更新方式有利于土壤氮保存和提高氮素有效性,在氮素养分循环方面比人工林经营方式更具有优越性。
中图分类号:
高艳丽,杨智杰,张丽,熊德成. 不同更新方式对亚热带常绿阔叶林土壤氮矿化的影响[J]. 林业科学, 2021, 57(4): 24-31.
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