模拟N沉降下三种林分土壤营养动态分析

发布时间：2018-03-13 04:28

  本文选题：氮沉降　切入点：土壤养分　出处：《生态学报》2017年01期 　论文类型：期刊论文

【摘要】：通过模拟N沉降实验,设置对照(CK,0 g N m~(-2)a~(-1));低氮(LN,5 g N m~(-2)a~(-1));中氮(MN,10 g N m~(-2)a~(-1));高氮(HN,15 g N m~(-2)a~(-1))4种N处理,以NH_4NO_3为外源N来研究福建省三明格氏栲自然保护区内板栗人工林、观光木人工林及米槠天然林0—10 cm土层养分变化动态。结果表明:N沉降会使板栗人工林土壤显著酸化,P含量降低,在一些时间段内,中高水平的N沉降会显著降低有机C、全N和速效N含量,中或低水平N沉降会显著降低土壤全P和速效P含量,而从第6个月起只有LN处理会显著降低土壤K含量。N沉降总体上会不同程度地提高观光木人工林土壤p H值、有机C、全N和速效N含量,有时影响会达显著或极显著水平;比较而言,LN和HN处理更会造成土壤全P的富集,而MN处理对速效P的影响更显著;LN和HN处理也会显著增加K含量,且以LN处理的效果更稳定。总体上N沉降量越大米槠天然林土壤酸化越显著;N沉降会使其有机C和速效P量显著波动;实验期间,HN处理会显著降低土壤全N和速效N量,而LN与MN处理则会使速效N和K含量增加;在4种处理下全P含量会呈相同趋势波动,差异不显著。
[Abstract]:Through the simulated N deposition experiment, the control group (CK 0 g) was set up as control group (CK 0 g); low nitrogen (LNN) 5 g (Nm ~ (2)) ~ (-1) ~ (-1); MN ~ (10 g) 10 g ~ (-1) N ~ (-1); high nitrogen HN ~ (15 g) ~ (15 g) N ~ (m) ~ ((2)) ~ (2) A ~ (1) ~ (-1). The artificial plantation of Castanea mollissima in San-ming Castanopsis kawakamii Nature Reserve was studied by using NH_4NO_3 as exogenous N, and the results were as follows: (1) in order to study the artificial plantation of Castanea mollissimi in San-ming Castanopsis Nature Reserve, Fujian Province, China. The results showed that the soil acidified P content of Castanopsis mollissima plantation was significantly decreased by the sedimentation of 0 to 10 cm soil layer, and the soil acidified P content was decreased in some time periods. The content of organic C, total N and available N decreased significantly at the middle and high levels of N deposition, and the total P and available P contents of soil decreased significantly at middle or low levels of N deposition. From the 6th month on, only LN treatment could significantly reduce soil K content and N deposition. In general, soil pH value, organic C, total N and available N content of sightseeing wood plantation could be increased to some extent, and sometimes the effect would reach significant or extremely significant level. In comparison, Ln and HN treatments resulted in the enrichment of total P in soil, while the effect of MN treatment on the available P was more significant, and that of LN and HN treatment also significantly increased K content. And the effect of LN treatment was more stable. In general, the soil acidification of rice Castanopsis eyrei natural forest resulted in significant fluctuation of organic C and available P content, and HN treatment significantly decreased soil total N and available N content during the experiment. However, the contents of available N and K increased in LN and MN treatments, and the total P content fluctuated in the same trend under the four treatments, but the difference was not significant.
【作者单位】： 福建师范大学地理科学学院;
【基金】：国家自然科学基金资助项目(31000298) 福建省自然科学基金资助项目(2015J01122) 福建师范大学优秀青年骨干教师培养基金资助项目(fjsdjk2012075)
【分类号】：S714.8
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本文编号：1604824