本文選題：氮沉降　切入點(diǎn)：土壤養(yǎng)分　出處：《生態(tài)學(xué)報(bào)》2017年01期 　論文類(lèi)型：期刊論文

【摘要】：通過(guò)模擬N沉降實(shí)驗(yàn),設(shè)置對(duì)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種N處理,以NH_4NO_3為外源N來(lái)研究福建省三明格氏栲自然保護(hù)區(qū)內(nèi)板栗人工林、觀光木人工林及米櫧天然林0—10 cm土層養(yǎng)分變化動(dòng)態(tài)。結(jié)果表明:N沉降會(huì)使板栗人工林土壤顯著酸化,P含量降低,在一些時(shí)間段內(nèi),中高水平的N沉降會(huì)顯著降低有機(jī)C、全N和速效N含量,中或低水平N沉降會(huì)顯著降低土壤全P和速效P含量,而從第6個(gè)月起只有LN處理會(huì)顯著降低土壤K含量。N沉降總體上會(huì)不同程度地提高觀光木人工林土壤p H值、有機(jī)C、全N和速效N含量,有時(shí)影響會(huì)達(dá)顯著或極顯著水平;比較而言,LN和HN處理更會(huì)造成土壤全P的富集,而MN處理對(duì)速效P的影響更顯著;LN和HN處理也會(huì)顯著增加K含量,且以L(fǎng)N處理的效果更穩(wěn)定�？傮w上N沉降量越大米櫧天然林土壤酸化越顯著;N沉降會(huì)使其有機(jī)C和速效P量顯著波動(dòng);實(shí)驗(yàn)期間,HN處理會(huì)顯著降低土壤全N和速效N量,而LN與MN處理則會(huì)使速效N和K含量增加;在4種處理下全P含量會(huì)呈相同趨勢(shì)波動(dòng),差異不顯著。
[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.
【作者單位】： 福建師范大學(xué)地理科學(xué)學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(31000298) 福建省自然科學(xué)基金資助項(xiàng)目(2015J01122) 福建師范大學(xué)優(yōu)秀青年骨干教師培養(yǎng)基金資助項(xiàng)目(fjsdjk2012075)
【分類(lèi)號(hào)】：S714.8
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本文編號(hào)：1604824