在马尾松种植园的土壤中添加氮元素能提高土壤中的氮矿化度,但不能提高碳矿化度

IF 2.7 3区 农林科学 Q2 ECOLOGY
Tian Chen, Ruimei Cheng, Wenfa Xiao, Lixiong Zeng, Yafei Shen, Lijun Wang, Pengfei Sun, Meng Zhang, Jing Li
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引用次数: 0

摘要

大气中的氮沉降可通过改变土壤中氮的供应量来影响土壤有机碳(SOC)和全氮(Total N)的水平。土壤样本采集自中国三峡库区的马尾松种植园。土壤样品采集自中国三峡库区的马尾松种植园。在三年的时间里,种植园的土壤接受了四种不同水平的氮添加(0 [N0]、30 [N30]、60 [N60]和 90 [N90] kg N ha-1 yr-1)。通过培养实验评估了氮添加量对集料中 SOC 和总氮矿化的影响,包括四种集料大小(2000 - 8000、1000 - 2000、250 - 1000 和 < 250 μm)。与小于 250 μm 的部分相比,2000 - 8000 μm 部分的累积碳矿化度下降了 9 - 21%,这表明土壤团聚体提高了土壤中碳的稳定性。累积氮矿化水平在 2000 - 8000 μm 部分一直处于最低水平,表明团聚体减少了矿化相关的氮损失。在森林土壤样本中添加氮会导致累积碳矿化量减少。与此相反,在微团聚体中添加氮元素后,累积氮矿化度却出现了相反的趋势。硝化作用是净氮矿化的主要因素。SOC 和总含量随着 N30 和 N60 的添加而增加。添加氮会导致 1000 - 2000 μm 部分的重量比增加。这些研究结果证实,土壤团聚体的结构特征在氮沉积的情况下对固存有机碳和总氮起着至关重要的作用,同时也强调了氮输入造成的土壤中氮的流失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nitrogen addition enhances nitrogen but not carbon mineralization in aggregate size fractions of soils in a Pinus massonia plantation
Atmospheric nitrogen (N) deposition can impact the levels of soil organic carbon (SOC) and total nitrogen (total N) by altering the soil N availability. However, the effect of N input on the mineralization of SOC and total N in various soil aggregate size fractions requires further clarification.The soil samples were collected from a Pinus massoniana plantation situated in the Three Gorges Reservoir Area of China. Over a period of three years, the soils from the plantation were subjected to four different levels of nitrogen addition (0 [N0], 30 [N30], 60 [N60], and 90 [N90] kg N ha−1 yr−1). The impact of N addition on the mineralization of SOC and total N in aggregates was evaluated through an incubation experiment, encompassing four aggregate sizes (2000 − 8000, 1000 − 2000, 250 − 1000, and < 250 μm).The < 250 μm fraction showed the highest levels of cumulative C mineralization, while the lowest levels were observed in the 2000 − 8000 μm fraction. Compared to the < 250 um fraction, a drop of 9 − 21% in cumulative C mineralization was observed in the 2000 − 8000 μm fraction, indicating that soil aggregates enhance the stability of C in the soil. Cumulative N mineralization levels were consistently at their lowest in the 2000 − 8000 μm fraction, indicating aggregates reducing mineralization-related N loss. Adding N to forest soil samples led to a reduction in cumulative C mineralization. In contrast, an opposite trend was observed in the cumulative N mineralization after adding N in microaggregates. Nitrification was the main contributor to net N mineralization. SOC and total levels increased in response to N30 and N60. N addition leads to an increase in the weight ratio of the 1000 − 2000 μm fraction. Moreover, N90 was linked to decreases in microbial biomass C and N.These findings confirm that the structural characteristics of soil aggregates play a crucial role in sequestering organic carbon and total N sequestration in the presence of N deposition, while highlighting N loss from the soil caused by N input.
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来源期刊
CiteScore
4.50
自引率
6.20%
发文量
256
审稿时长
12 weeks
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