Effects of land use change on soil gross nitrogen transformation rates in subtropical acid soils of Southwest China
Effects of land use change on soil gross nitrogen transformation rates in subtropical acid soils of Southwest China
复制标题
西南亚热带酸性土壤土地利用变化对土壤总氮转化率的影响
DOI：
10.1007/s11356-015-4262-8
复制
发表时间：
2015-03
期刊：
影响因子：
--
通讯作者：
Zhihong Xu
中科院分区：
文献类型：
--
作者：
Yongbo Xu;Zhihong Xu
土地利用变化会影响土壤总氮的转化，但在亚热带条件下，这方面的信息尤其缺乏。研究了亚热带中国地区森林土壤和农田土壤中潜在的总氮转化速率。在好氧条件下，通过15N示踪研究，量化了土壤中同时发生的总氮转化。结果表明，土地利用类型的变化显著改变了大部分总氮的转化速率。农业土壤的总氨化速率和硝化速率显著高于森林土壤，而总氮固定速率则相反。森林土壤的总碳(C)浓度和C/N比高于农业土壤，这与森林土壤中总氮的固定速率较大有关。森林土壤的总氨化作用较低，但总硝化速率可忽略不计，但总氮固定率远高于农业土壤，这表明这可能是通过增加微生物量N和相对不稳定的有机氮来有效保存森林土壤中的有效矿质氮的机制。农业土壤中较大的总硝化速率和较低的总氮固定率表明，森林还田土壤通过NO3-−淋溶或反硝化作用(当有反硝化条件时)可能对环境产生更多的负面影响。
Land use change affects soil gross nitrogen (N) transformations, but such information is particularly lacking under subtropical conditions. A study was carried out to investigate the potential gross N transformation rates in forest and agricultural (converted from the forest) soils in subtropical China. The simultaneously occurring gross N transformations in soil were quantified by a15N tracing study under aerobic conditions. The results showed that change of land use types substantially altered most gross N transformation rates. The gross ammonification and nitrification rates were significantly higher in the agricultural soils than in the forest soils, while the reverse was true for the gross N immobilization rates. The higher total carbon (C) concentrations and C / N ratio in the forest soils relative to the agricultural soils were related to the greater gross N immobilization rates in the forest soils. The lower gross ammonification combined with negligible gross nitrification rates, but much higher gross N immobilization rates in the forest soils than in the agricultural soils suggest that this may be a mechanism to effectively conserve available mineral N in the forest soils through increasing microbial biomass N, the relatively labile organic N. The greater gross nitrification rates and lower gross N immobilization rates in the agricultural soils suggest that conversion of forests to agricultural soils may exert more negative effects on the environment by N loss through NO3−leaching or denitrification (when conditions for denitrification exist).
登录
查看更多内容
影响因子：
2.9
作者：
D. Kirkham;W. V. Bartholomew
通讯作者：
D. Kirkham;W. V. Bartholomew
影响因子：
4.2
作者：
Y. B. Xu;Zucong Cai
通讯作者：
Y. B. Xu;Zucong Cai
影响因子：
3.6
作者：
Ju-Pei Shen;Zhihong Xu;Ji-Zheng He
通讯作者：
Ji-Zheng He
影响因子：
5.7
作者：
W. Zhong;Z. Cai;He Zhang
通讯作者：
W. Zhong;Z. Cai;He Zhang
影响因子：
9.7
作者：
Fierer, N;Schimel, JP
通讯作者：
Schimel, JP