Agricultural land use affects nitrate production and conservation in humid subtropical soils in China
Agricultural land use affects nitrate production and conservation in humid subtropical soils in China
复制标题
农业土地利用影响中国湿润亚热带土壤硝酸盐的产生和保存
DOI：
10.1016/j.soilbio.2013.03.006
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发表时间：
2013-07
影响因子：
9.7
通讯作者：
Cai, Zucong
中科院分区：
文献类型：
--
作者：
Yang Jiajia;Yang Wenyan;Mueller Christoph;Cai, Zucong
迄今为止，对亚热带农业土壤总氮(N)转化特征的研究很少。本研究以中国湿润亚热带地区12个天然林地和10个农业土壤为研究对象，探讨了不同土地利用方式对土壤总氮转化的影响。结果表明，林地土壤的总自养硝化速率（平均0.19 mg N kg−1d−1）显著低于农业土壤（平均1.81 mg N kg−1d−1）（p < 0.01）。农业土壤NO3−固定率（平均0.10 mg N kg−1d−1）显著低于林地土壤（平均0.47 mg N kg−1d−1）（p < 0.01）。在林地土壤中，平均98%的NO3−可被固定为有机氮，而在农业土壤中仅占10%。这些差异导致林地土壤中无机氮以NH4+为主；农业土壤中无机氮以NO3−为主。林地土壤转化为农业土壤后，土壤氮淋溶和径流的风险急剧增加。在亚热带农业土壤中施用高碳氮比有机肥，提高土壤有机碳含量和碳氮比，有望提高土壤NO3−固定能力，降低土壤氮淋溶和径流风险。
To date, very few studies have been conducted to investigate the characteristics of gross nitrogen (N) transformations in subtropical agricultural soils. In this study, 12 natural woodland and 10 agricultural soils were collected to investigate the effects of land use on soil gross N transformations in the humid subtropical zones in China. The results showed that gross autotrophic nitrification rates (average 0.19 mg N kg−1d−1) in the woodland soils were significantly lower than those determined in the agricultural soils (average 1.81 mg N kg−1d−1) (p < 0.01). However, the NO3−immobilization rates (average 0.10 mg N kg−1d−1) in the agricultural soils were significantly lower than in the woodland soils (average 0.47 mg N kg−1d−1) (p < 0.01). On average, 98% of the total NO3−produced could be immobilized into organic-N in the woodland soils, while, it accounted for only 10% in the agricultural soils. These differences in gross N transformations resulted in the inorganic N being dominated by NH4+in the woodland soils; however, NO3−dominated the inorganic N in the agricultural soils. The risk of N leaching and runoff from soil sharply increases after woodland soils are converted to agricultural soils. Application of organic fertilizers with high C/N ratios to agricultural soils in subtropical regions to increase soil organic C content and the C/N ratio is expected to improve NO3−immobilization capacity and reduce the risk of N leaching and runoff from soil.
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影响因子：
4
作者：
Martinelli, LA;Piccolo, MC;Treseder, K
通讯作者：
Treseder, K
影响因子：
9.4
作者：
Högberg, MN;Bååth, E;Högberg, P
通讯作者：
Högberg, P
中国东部不同气候梯度森林土壤的氮循环
影响因子：
4.9
作者：
Zhang, Jinbo;Zhang, Jinbo;Zhu, Tongbin;Zhu, Tongbin;Cai, Zucong;Cai, Zucong;Mueller, Christoph;Mueller, Christoph
通讯作者：
Mueller, Christoph
影响因子：
64.8
作者：
J. Stark;S. Hart
通讯作者：
J. Stark;S. Hart
DOI：
10.1051/agro:2002060
发表时间：
2002-11-01
期刊：
AGRONOMIE
影响因子：
--
作者：
Stockdale, EA;Hatch, DJ;Watson, CJ
通讯作者：
Watson, CJ