Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone
Accumulation of nitrate and dissolved organic nitrogen at depth in a red soil Critical Zone
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红壤临界区深部硝酸盐和溶解有机氮的积累
DOI：
10.1016/j.geoderma.2018.11.019
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发表时间：
2019-03
期刊：
影响因子：
6.1
通讯作者：
Gan-Lin Zhang
中科院分区：
文献类型：
--
作者：
Huayong Wu;Xiaodong Song;Xiaorui Zhao;Xinhua Peng;Hu Zhou;Paul D. Hallett;Mark E. Hodson;Gan-Lin Zhang
据报道，在干旱到半湿润地区，硝酸盐在表层1 m和亚表层土壤(>；1 m)中积累，但在湿润地区没有。到目前为止，湿润地区整个风土层(统称为土壤和腐泥岩)中的硝酸盐清单几乎没有受到关注，这可能是因为以前认为硝化速率低，以及严重的地表径流和侵蚀造成了大量的氮(N)损失。为了了解湿润环境下地下(土壤和腐殖质)中是否存在活性氮以及活性氮是如何存在的，在不同土地利用方式(旱地、林地和水田)下，对典型红壤临界区9 m土层中NO3、NH4+-N和溶解有机氮(DON)的含量进行了研究。红壤临界区观测站位于亚热带江西省中国，年平均降水量为1795 mm，年均潜在蒸散量为1229 mm。所研究的风化石呈酸性，风化程度高，质地以粘壤土-粘土为主。结果表明，旱地表层平均有92%(82 7 ± 97 N N ha−1)和82%(521−± 153 153 kg N ha−1)DON存在于深层(1 m至基岩表层)，而92%(283 kg N ha−1)和78%(82 0 kg N ha−1)存在于林地表层。在1~4m深度段，硝态氮在旱地表层随深度显著积累(p <； 0.0 1)，而上层3 m带的总库存量(6 32 ± 75 kg N ha−1)平均占总库存量的71%。在0~3m土层中，溶解有机氮随深度的增加而显著积累(p <； 0.0 1)，而上层3 m带的总库存量(40 8 ± 75 kg N ha−1)平均占总库存量的%。旱地表层NH4+-N没有显著积累(p = 为0.35)。在不同耕作年限的稻田风化层中，未测到土壤中溶解氮的大量积累。这一发现表明，大量的活性氮可能存在于深层表层，而不是在亚热带地区常规调查的土壤中，这表明陆地氮收支的缺失部分，并引发了人们对潜在地下水硝酸盐污染的担忧。
Nitrate accumulation has been reported in the top 1 m and subsurface soil (>1 m) across arid to semi-humid regions, but not in humid regions. Nitrate inventories through the whole regolith, referred to collectively as soil and saprolite, in humid regions have received little attention to date, likely due to previously assumed low nitrification rates and large nitrogen (N) losses by severe surface runoff and erosion. In order to understand if and how reactive N exists in the below ground (soil and saprolite) in humid environment, the amount of NO3−-N, NH4+-N and dissolved organic N (DON) present in the regolith to a depth of 9 m in a typical red soil Critical Zone was investigated under different land uses (upland, woodland and paddy field). The Red Soil Critical Zone Observatory is located in the subtropical Jiangxi Province, China, with a mean annual precipitation of 1795 mm and mean annual potential evapotranspiration of 1229 mm. The examined regoliths were acidic, highly weathered, and mainly clay loam to clay in texture. Results showed that on average 92% (827 ± 97 kg N ha−1) of NO3−-N and 82% (521 ± 153 kg N ha−1) of DON were stored at depth (from a depth of 1 m to the bedrock surface) in the upland regolith, while 92% (283 kg N ha−1) of NO3−-N and 78% (820 kg N ha−1) of DON were stored at depth in the woodland regolith. Nitrate N significantly accumulated with depth in the upland regolith from the 1- to 4-m depth interval (p < 0.01), while the inventory (632 ± 75 kg N ha−1) in the top 3-m zone accounted for on average 71% of the total. Dissolved organic N significantly accumulated with depth in the upland regolith from the 0- to 3-m depth interval (p < 0.01), while the inventory (408 ± 75 kg N ha−1) in the top 3-m zone accounted for on average 64% of the total. There was no significant accumulation for NH4+-N throughout the upland regolith (p = 0.35). No substantial accumulation of dissolved N was measured at depth in paddy field regoliths with different cultivation ages. The finding that large reservoirs of reactive N can exist in deep regolith rather than in the routinely investigated solum of subtropical regions shows a missing part of the terrestrial N budget and raises concerns about potential groundwater nitrate pollution.
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DOI：
10.1097/ede.0b013e3181d6201d
发表时间：
2010-05
期刊：
Epidemiology (Cambridge, Mass.)
影响因子：
--
作者：
Ward MH;Kilfoy BA;Weyer PJ;Anderson KE;Folsom AR;Cerhan JR
通讯作者：
Cerhan JR
DOI：
10.1579/05-r-046r1.1
发表时间：
2006-08
期刊：
--
影响因子：
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作者：
J. Reynolds-Vargas;Julio Fraile-Merino;R. Hirata
通讯作者：
J. Reynolds-Vargas;Julio Fraile-Merino;R. Hirata
影响因子：
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作者：
赵其国 Zhao Qiguo;黄国勤 Huang Guoqin;马艳芹 Ma Yanqin
通讯作者：
赵其国 Zhao Qiguo;黄国勤 Huang Guoqin;马艳芹 Ma Yanqin
农业山坡高时空分辨率土壤储水量预测
影响因子：
6.7
作者：
Dongdong Wang;Tahir Muhammad;Asim Biswas;Xinhua Peng
通讯作者：
Xinhua Peng
通过改善中国集约农业系统的氮肥管理来降低环境风险
DOI：
10.1073/pnas.0813417106
发表时间：
2009-03-03
影响因子：
11.1
作者：
Ju, Xiao-Tang;Xing, Guang-Xi;Zhang, Fu-Suo
通讯作者：
Zhang, Fu-Suo