稻草覆盖和香根草篱对红壤水稳性团聚体组成及有机碳含量的影响

发布时间：2018-05-01 02:08

本文选题：稻草覆盖 + 香根草篱　；参考：《生态学报》2016年12期

【摘要】：基于植物篱和秸秆覆盖控制红壤坡耕地水土流失的长期定位试验,研究香根草篱(H)、稻草覆盖(M)、香根草篱+稻草覆盖(HM)水保措施下红壤水稳性团聚体组成及有机碳分布特征。结果表明:与常规等高农作模式(CK)相比,草篱、稻草覆盖、草篱+稻草覆盖模式下土壤总有机碳含量提高0.07—2.42 g/kg。草篱对土壤团聚体组成及其结合有机碳的影响在篱内效果显著,随着与草篱距离增大影响减弱。草篱和稻草覆盖对土壤团聚体组成和结合有机碳含量的影响不同,草篱主要增加2 mm水稳性团聚体含量及其结合有机碳含量,稻草覆盖增加0.25 mm水稳性团聚体含量及其结合有机碳含量。综合来看,草篱和稻草覆盖相结合对改善坡面土壤结构作用稳定。土壤有机碳含量较高时,土壤总有机碳含量与粒径2mm的大团聚体有机碳含量呈显著正相关(r=0.659);随着有机碳含量降低,土壤总有机碳含量与土壤0.25—0.053 mm和0.053 mm微小团聚体碳含量相关性逐渐增大。
[Abstract]:Based on the long-term localization experiment of controlling soil erosion in red soil sloping land with hedgerow and straw mulching, the composition of water-stable aggregates and the distribution characteristics of organic carbon in red soil under soil conservation were studied. The results showed that the soil total organic carbon content increased by 0.07-2.42 g / kg under straw hedge, straw mulching and straw mulching. The effect of hedgerow on the composition of soil aggregate and its binding organic carbon was significant in the hedgerow, and weakened with the increase of the distance between the hedgerow and the hedgerow. The effects of hedgerow and straw mulch on soil aggregate composition and bound organic carbon content were different. Hedgerow mainly increased 2 mm water stable aggregate content and bound organic carbon content. Straw mulch increased 0.25 mm water stable aggregate content and bound organic carbon content. In a word, the combination of hedgerow and straw mulch has a stable effect on improving soil structure on slope. When the soil organic carbon content was high, there was a significant positive correlation between the soil total organic carbon content and the organic carbon content of the large aggregates with the diameter of 2mm, and with the decrease of the organic carbon content, The correlation between soil total organic carbon content and soil carbon content of 0.25-0.053mm and 0.053 mm micro-aggregate gradually increased.
【作者单位】：江西省红壤研究所国家红壤改良工程技术研究中心;
【基金】：国家青年自然科学基金资助项目(41301235) 江西省科技支撑项目(20151BBF60060) 国家“十二五”科技支撑项目(2012BAD05B00) 水利部行业专项项目(201301050)
【分类号】：S157

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