旋耕转深松和秸秆还田增加农田土壤团聚体碳库

发布时间：2018-04-20 22:10

本文选题：土壤 + 有机碳　；参考：《农业工程学报》2017年24期

【摘要】：土壤耕作和秸秆还田能够显著影响土壤结构和养分周转,也是土壤团聚体分布及更新周转的主要驱动因素。该研究基于连续9 a的旋耕-深松定位试验,对比了长期旋耕农田转变为深松以及秸秆还田对农田土壤0~50 cm土壤团聚体分布、稳定性及团聚体碳含量的影响,分析了团聚体碳对土壤有机碳的贡献率及相互关系。研究结果表明,将长期旋耕农田转变为旋耕-深松农田显著影响了0~50 cm土层的团聚体分布及其碳含量。旋耕-深松配合秸秆还田(RTS-STS)模式能够显著提高表层土壤较大粒级团聚体的比例,且显著提高了土壤团聚体稳定性,分别比旋耕-深松无秸秆还田(RTA-STA)、旋耕秸秆还田(RTS)和旋耕无秸秆还田(RTA)处理高6.1%、65.4%和87.8%;同时,RTS-STS处理显著提高了0~20 cm土层团聚体碳含量和对有机碳的贡献率,虽然在20~30和30~50 cm土层之间,2个处理的团聚体碳含量差异并不明显,但RTS-STS处理的团聚体碳含量对有机碳的贡献率较0~20 cm土层和RTS处理显著降低。通过耕作方式转变、秸秆还田和两者的交互作用对土壤团聚体分布及其碳含量影响的作用力分析可看出,耕作、秸秆及其交互作用是影响不同土层中各处理在不同粒级团聚体分布比例及碳含量差异的主要因素。通过相关分析表明,土壤有机碳含量与团聚体稳定性及其自身碳含量之间存在显著或极显著的正相关关系。旋耕-深松配合秸秆还田(RTS-STS)模式促进了0~20 cm土壤团聚体的形成和稳定,提高了土壤团聚体碳库和对有机碳的贡献,对提升土壤有机碳水平具有积极意义。
[Abstract]:Soil tillage and straw return can significantly affect soil structure and nutrient turnover, and are also the main driving factors of soil aggregate distribution and regeneration turnover. In this study, the effects of long-term rotation tillage conversion to deep pine and straw returning on the distribution, stability and carbon content of soil aggregates in 0 ~ (50) cm soil were compared. The contribution rate and relationship of aggregate carbon to soil organic carbon were analyzed. The results showed that the distribution of aggregates and carbon content in the 0 ~ (50) cm soil layer were significantly affected by the conversion of the long-term rotary tillage field to the rotary tillage-deep pine field. The model of rotary tillage and deep loosening combined with straw returning to the field can significantly increase the proportion of larger grain-grade aggregates in surface soil and improve the stability of soil aggregates. Compared with the treatments of RTA-STAN, RTS and RTAS), RTA-STAP and RTAS were 65.4% and 87.8% higher than those of RTA-STAS, RTS-STS and RTS-STS treatments, respectively, and the carbon content and contribution rate to organic carbon in 0 ~ 20 cm soil layer were significantly increased by RTS-STS treatment. Although there was no significant difference in carbon content between 20 ~ 30 and 30 ~ 50 cm soil layers, the contribution rate of RTS-STS treatment to organic carbon was significantly lower than that of 0 ~ 20 cm soil layer and RTS treatment. Through the analysis of the effects of straw returning and their interaction on soil aggregate distribution and carbon content, it can be seen that tillage. Straw and its interaction are the main factors that affect the distribution ratio and carbon content of different treatments in different soil layers. The correlation analysis showed that there was a significant or extremely significant positive correlation between soil organic carbon content and aggregate stability and its own carbon content. The model of rotary tillage and deep loosening combined with straw returning to the field promoted the formation and stability of soil aggregates at 20 cm, increased the carbon pool of soil aggregates and their contribution to organic carbon, and had a positive significance in raising the level of soil organic carbon.
【作者单位】：山东省农业科学院农业资源与环境研究所农业部黄淮海平原农业环境重点实验室山东省植物营养与肥料重点实验室山东省环保肥料工程技术研究中心;山东省水稻研究所;新西兰农业科学院鲁亚库拉研究中心;
【基金】：国家自然科学基金(41701337) 公益性行业(农业)科研专项(201503121) 山东省自然科学基金(ZR2015CQ007) 山东省农业科学院青年科研基金(2015YQN37) 山东省科技发展计划(2016STS001) “海外泰山学者”建设工程专项经费山东省农业科学院农业科技创新工程(CXGC2016A12)共同资助
【分类号】：S153.6

【相似文献】