施氮对海南橡胶林土壤碳排放的影响

发布时间：2018-05-06 15:09

本文选题：橡胶林 + 施氮　；参考：《生态环境学报》2016年07期

【摘要】：阐明不同生态系统土壤呼吸碳排放特征及其影响因子,对于评估陆地生态系统碳平衡具有重要作用。当前,人们对不同生态系统土壤呼吸对施氮或氮沉降的响应的认识还很不一致。虽然目前已对橡胶(Hevea brasiliensis)林土壤呼吸进行了较多的研究,但对施氮对橡胶林土壤呼吸的影响还了解得不多。采用静态碱液吸收法,研究了4种施氮水平下(不施氮,N0;低氮100 kg·hm~(-2),N100;中氮230 kg·hm~(-2),配施有机肥氮30 kg·hm~(-2),N230;高氮400 kg·hm~(-2),N400)海南橡胶林土壤呼吸的碳排放速率、通量及其影响因子。结果表明,橡胶林土壤呼吸的碳排放速率具有明显的季节变化特征,全年呈多峰型曲线。土壤呼吸碳排放速率与施氮量、土壤湿度和土壤温度均存在显著或极显著相关性。不同施氮处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)。与不施氮处理相比,较低的施氮水平(N100)并没有显著影响土壤呼吸,而继续增施氮肥则显著激发了橡胶林土壤碳排放。与N100和N400相比,N230化肥配施有机肥并没有引起土壤碳排放的显著增加。综上所述,施氮能促进橡胶林土壤呼吸碳排放,但其促进程度与施氮量有关。
[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.
【作者单位】：海南大学农学院;中国热带农业科学院橡胶研究所;
【基金】：国家自然科学基金项目(31400529) 海南省自然科学基金项目(314143)
【分类号】：S714

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