Effects of long-term nitrogen and phosphorus additions on soil acidification in an N-rich tropical forest
Effects of long-term nitrogen and phosphorus additions on soil acidification in an N-rich tropical forest
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长期氮磷添加对富氮热带森林土壤酸化的影响
DOI：
10.1016/j.geoderma.2016.09.017
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发表时间：
2017
期刊：
影响因子：
6.1
通讯作者：
Mo, Jiangming
中科院分区：
文献类型：
--
作者：
Chen, Hao;Zhu, Xiaomin;Mori, Taiki;Mo, Jiangming
具有高度风化土壤的热带森林被认为对氮(N)沉积和随后的土壤酸化高度敏感。热带森林生态系统中磷的缺乏被认为是使生态系统更容易受到N衍生酸化影响的一个重要因素。然而，在大气氮沉降增加的湿润热带地区，土壤磷有效性的变化如何影响土壤酸化过程仍然知之甚少。为了解决这个问题，我们在一片富N的热带森林中进行了长期的N和P添加试验，包括四个处理：对照、N添加、P添加和NP添加(N和P都是150亿公斤/公顷−和1年−1)。我们假设，通过外源磷添加来缓解磷限制将缓解氮源土壤酸化。结果表明，6年施氮量显著降低土壤pH(降低0.23，p=0.013)，降低土壤碱基饱和度(32.8%，p=0.0017)，提高铝钙比(p=0.015)，表明施N加速了土壤酸化。正如我们预期的那样，在最初的几年里，磷的添加增加了土壤的pH值，这可能是因为生物对硝酸盐和磷酸盐的吸收增加了。然而，在最初的几年中，连续的N添加促进了酸化，并且在Al缓冲阶段使P的缓冲作用在土壤中看不到。我们的结果表明，在富N的热带生态系统中，磷的输入不能缓解过量的N衍生土壤酸化，减少反应N的排放是未来受影响生态系统可持续发展的当务之急。
Tropical forests with highly-weathered soils are considered to be high sensitive to nitrogen (N) deposition and subsequent soil acidification. Phosphorus (P) shortage in tropical forest ecosystems is suggested to be one important factor that makes the ecosystems more vulnerable to N-derived acidification. However, it remains poorly understood on how changes in soil P availability affect soil acidification processes in humid tropical zones with elevated atmospheric N deposition. To address this question, we conducted a long-term N and P addition experiment in an N-rich tropical forest, consisting of four treatments: control, N-addition, P-addition, and NP-addition, respectively (both N and P are 150 kg ha− 1yr− 1). We hypothesized that relieving P-limitation by exogenous P addition will mitigate N-derived soil acidification. Results showed that six-year N addition significantly decreased soil pH (by 0.23,p= 0.013), soil base saturation (BS) (by 32.8%,p= 0.0017), and increased the ratio of aluminum to calcium (Al/Ca) (p= 0.015), suggesting that soil acidification was accelerated by N input. As we expected, P addition increased soil pH in the first few years, probably because of the increased biotic uptakes of nitrate and phosphate. However, after the first few years, continuous N addition promoted acidification and made the buffering effects by P addition invisible in our soils at the Al-buffering stage. Our results suggest that P inputs cannot alleviate excess N-derived soil acidification in N-rich tropical ecosystems, and that it is urgent to reduce reactive N emission for sustainable development of the affected ecosystems in the future.
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影响因子：
2.5
作者：
B. Ulrich
通讯作者：
B. Ulrich
DOI：
10.2136/sssaj1999.03615995006300020017x
发表时间：
1999-03
影响因子：
2.9
作者：
C. Johannisson;P. Högberg;D. Myrold
通讯作者：
C. Johannisson;P. Högberg;D. Myrold
影响因子：
3.7
作者：
ten Berge HF;van der Meer HG;Steenhuizen JW;Goedhart PW;Knops P;Verhagen J
通讯作者：
Verhagen J
影响因子：
8.9
作者：
Horswill, Paul;O'Sullivan, Odhran;Leake, Jonathan R.
通讯作者：
Leake, Jonathan R.
影响因子：
5.5
作者：
Mayor, Jordan R.;Joseph Wright, S.;Turner, Benjamin L.
通讯作者：
Turner, Benjamin L.