本文選題：橡膠林 + 施氮��； 參考：《生態(tài)環(huán)境學(xué)報》2016年07期

【摘要】：闡明不同生態(tài)系統(tǒng)土壤呼吸碳排放特征及其影響因子,對于評估陸地生態(tài)系統(tǒng)碳平衡具有重要作用。當(dāng)前,人們對不同生態(tài)系統(tǒng)土壤呼吸對施氮或氮沉降的響應(yīng)的認(rèn)識還很不一致。雖然目前已對橡膠(Hevea brasiliensis)林土壤呼吸進行了較多的研究,但對施氮對橡膠林土壤呼吸的影響還了解得不多。采用靜態(tài)堿液吸收法,研究了4種施氮水平下(不施氮,N0;低氮100 kg·hm~(-2),N100;中氮230 kg·hm~(-2),配施有機肥氮30 kg·hm~(-2),N230;高氮400 kg·hm~(-2),N400)海南橡膠林土壤呼吸的碳排放速率、通量及其影響因子。結(jié)果表明,橡膠林土壤呼吸的碳排放速率具有明顯的季節(jié)變化特征,全年呈多峰型曲線。土壤呼吸碳排放速率與施氮量、土壤濕度和土壤溫度均存在顯著或極顯著相關(guān)性。不同施氮處理土壤碳排放速率介于1.27~1.96 g·m~(-2)·d~(-1),年排放通量介于4.62~7.12 Mg·hm~(-2)·a~(-1)。與不施氮處理相比,較低的施氮水平(N100)并沒有顯著影響土壤呼吸,而繼續(xù)增施氮肥則顯著激發(fā)了橡膠林土壤碳排放。與N100和N400相比,N230化肥配施有機肥并沒有引起土壤碳排放的顯著增加。綜上所述,施氮能促進橡膠林土壤呼吸碳排放,但其促進程度與施氮量有關(guān)。
[Abstract]:It is important to clarify the carbon emission characteristics of soil respiration and its influencing factors in different ecosystems in order to evaluate the carbon balance of terrestrial ecosystems. At present, the response of soil respiration to nitrogen application or nitrogen deposition in different ecosystems is still inconsistent. Although more studies have been done on soil respiration in Hevea Brasiliensis forest, the effect of nitrogen application on soil respiration in rubber forest is not well understood. The carbon emission rates, fluxes and influencing factors of soil respiration in Hainan rubber forest were studied by using static lye absorption method under four nitrogen application levels (no N application N 0; low nitrogen application rate 100 kg / hm ~ (-2) N100; medium nitrogen 230 kg / hm ~ (-2) N combined with organic fertilizer N (30 kg / hm ~ (-2) N ~ (2 +) N _ (230); N _ (400) N = 400 kg / hm ~ (-2) N ~ (2 +). The results showed that the carbon emission rate of soil respiration in rubber forest showed obvious seasonal variation and showed multi-peak curve throughout the year. There were significant or extremely significant correlations between soil respiration carbon emission rate and nitrogen application amount, soil moisture and soil temperature. The soil carbon emission rates of different nitrogen treatments ranged from 1.27 ~ 1.96 g / m ~ (-1) ~ (-1) d ~ (-1) ~ (-1) ~ (-1) ~ (-1), and the annual emission flux was between 4.62 ~ 7.12 mg / hm ~ (-1) ~ (-1) mg 路m ~ (-1) 路m ~ (-1). Compared with the treatment without N application, the lower N application level (N 100) did not significantly affect soil respiration, but continued application of nitrogen fertilizer significantly stimulated soil carbon emissions in rubber forest. Compared with N100 and N400, N230 fertilizer combined with organic fertilizer did not cause a significant increase in soil carbon emissions. To sum up, nitrogen application can promote soil respiration carbon emissions, but the degree of promotion is related to the amount of nitrogen application.
【作者單位】： 海南大學(xué)農(nóng)學(xué)院;中國熱帶農(nóng)業(yè)科學(xué)院橡膠研究所;
【基金】：國家自然科學(xué)基金項目(31400529) 海南省自然科學(xué)基金項目(314143)
【分類號】：S714

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